[l] STORAGE
Contents
1. motor and converting kinetic energy to electric energy during regenerative braking and storing such electric power In such a vehicle employing the motor as the drive force source in order to enhance acceleration performance and running performance such as travel distance greater charge discharge capacity ofthe power storage unit is desired Here a configuration where a plurality of power storage units are mounted has been proposed as a method of increasing the charge discharge capacity of the power storage unit On the other hand as the power storage unit stores electric energy utilizing electrochemical action charge discharge characteristics thereof are susceptible to a temperature A general power storage unit is lower in the charge discharge performance as the temperature is lower Accordingly in order to maintain prescribed charge discharge performance temperature management in particular temperature increase control of the power storage unit is important For example Japanese Patent Laying Open No 11 26032 discloses a heating up device for a battery in an electric vehicle that raises a temperature ofthe battery mounted on the electric vehicle According to this device if a detected tem perature of the battery is equal to or lower than a prescribed value when an instruction is issued from at least one ofunlock detection means for detecting unlock of the vehicle timer means for notification of a set time and input means for in2. ECU FIG 3 is a functional block diagram of battery ECU 32 shown in FIG 1 The functions of various blocks shown in FIG 3 may be implemented by hardware or software Referring to FIG 3 battery ECU 32 includes a temperature increase instruction generation unit 320 a remaining SOC calculating unit 321 and an SOC setting unit 322 Temperature increase instruction generation unit 320 determines whether temperature increase control of power storage units 10 and 20 is necessary based on power storage unit temperatures Tb1 Tb2 from temperature detection units 12 and 22 respectively More specifically temperature increase instruction generation unit 320 determines whether each of power storage unit temperatures Tb1 Tb2 is lower than the corresponding lower limit temperature or not When it is determined that the temperature of either one of power storage units 10 20 is lower than the corresponding lower limit temperature temperature increase instruction genera tion unit 320 generates the temperature increase instruction for the power storage unit of which temperature is lower than the corresponding lower limit temperature when a signal input from the outside of the vehicle is received or when the current time has reached a temperature increase start time If both of power storage unit temperatures Tb1 Tb2 are lower than the corresponding lower limit temperature tem perature increase instruction generation unit 320 generates the tempe
3. UNIT HAVING LOWER TEMPERATURE THAN CORRESPONDING LOWER LIMIT SET 1ST TARGET VALUE BASED ON SOC CHANGE AMOUNT U S Patent Jan 3 2012 Sheet 8 of 8 US 8 089 243 B2 FIG 8 S10 YES S11 SET TEMPERATURE INCREASE START TIME TO END TEMPERATURE INCREASE CONTROL OF POWER STORAGE UNIT ON SET TIME TEMPERATURE INCREASE REQUEST INPUT DRIVER GOING OUT S14 FULL CHARGE POWER STORAGE UNIT AND REALIZE TEMPERATURE INCREASE OF POWER STORAGE UNIT 1ST TARGET SOC 2ND TARGET 500 S15 CONNECTOR OPEN YES Tb1 amp Tb2 LOWER THAN CORRESPONDING LOWER LIMIT TEMPERATURE NO POWER STORAGE UNIT TEMPERATURE INCREASE CONTROL END START VEHICLE OPERATION US 8 089 243 B2 1 POWER SUPPLY DEVICE AND VEHICLE INCLUDING THE SAME TECHNICAL FIELD The present invention relates to a power supply device and a vehicle including the same More specifically the present invention relates to a power supply device including a power storage unit as well as to a vehicle including the same BACKGROUND ART Recently considering environmental issues attention has been paid to a vehicle employing a motor as a drive power source such as an electric vehicle a hybrid vehicle and a fuel cell vehicle Such a vehicle includes a power storage unit implemented for example by a secondary battery or an elec tric double layer capacitor for supplying electric power to the
4. adapt to electric power used in the house not shown outside the vehicle supply current detection unit 54 inserted in a positive supply line ACLp detects a supply current IAC from the commercial power supply and outputs the detected value to US 8 089 243 B2 5 drive ECU 50 In addition a supply voltage detection unit 52 connected between positive supply line ACLp and a negative supply line ACLn detects a supply voltage VAC from the commercial power supply and outputs the detected value to drive ECU 50 In addition an opening and closing detection unit 62 detects opening of charge connector 60 that is electrical disconnection between the vehicle and the commercial power supply Opening and closing detection unit 62 outputs a signal OP indicating the detected result to power supply device 100 Configuration of Power Supply Device Power supply device 100 includes a smoothing capacitor C a first converter CONV1 18 a second converter CONV2 28 a first power storage unit 10 a second power storage unit 20 charge discharge current detection units 16 26 charge discharge voltage detection units 14 24 tempera ture detection units 12 22 and a control unit 30 Control unit 30 includes a battery ECU 32 and a converter ECU 34 Smoothing capacitor C is connected between main positive bus MPL and main negative bus MNL and reduces a fluctu ating component contained in drive electric power output from converters 18 28 and rege
5. of limitation the scope of the present invention being interpreted by the terms of the appended claims The invention claimed is 1 A power supply device mounted on a vehicle compris ing a power storage unit capable of being charged and a control unit controlling charging of said power storage unit said control unit including a change instruction generation unit generating a change instruction instructing change of state of charge of said power storage unit based on information representing possibility of use of said vehicle by a user a target value setting unit setting when charging of said power storage unit starts a target value of state of charge of said power storage unit to a first value based on the condition of said power storage unit and setting when said change instruction is received after the start of charging of said power storage unit said target value to a second value higher than said first value and a charge processing unit executing a charging operation based on said target value wherein information representing the condition of said power stor ageunitis information oftemperature around said power storage unit said control unit further includes an amount of change calculating unit calculating an amount of change in state of charge of said power stor age unit necessary to increase temperature of said power storage unit and said target value setting unit stores said second value in advance and
6. power PAC to drive ECU 50 Based on power difference between the applied target supply power PAC and the actual value of supply power PAC drive ECU 50 generates switch ing instruction PWM3 of inverter 44 Accordingly the tem perature of power storage unit 10 increases as power storage unit 10 is charged FIG 6 illustrates a configuration of house 200 for trans mitting the temperature increase request signal from house 200 shown in FIG 5 to the vehicle Referring to FIGS 6 and 5 when temperature increase control from house 200 to power storage unit 100 is to be executed a modem 202 a control unit 204 and a sensor 206 are additionally installed in house 200 shown in FIG 5 Modem 202 transmits receives information to from a vehicle that is electrically connected Modem 202 is con nected between lines of commercial power supply 210 modulates information signal applied from control unit 204 and superposes the result on a current flowing through com mercial power supply line 210 and extracts a modulated signal included in the current flowing through power supply line 210 demodulates the signal to information signal and outputs the result to control unit 204 Control unit 204 is capable of managing the state of charge of power storage unit of the vehicle through transmission reception of information to from the vehicle and capable of receiving the temperature increase request from sensor 206 When a temperature increase reques
7. time ST and amount of change X1 When the current time reaches the start time temperature increase instruction generation unit 320 generates the temperature increase instruction WCM1 More preferably control unit 30 further includes tempera ture increase instruction generation unit 320 generating tem perature increase instruction WCM1 in response to a tem perature increase request from outside More preferably temperature increase instruction genera tion unit 320 outputs temperature increase instruction WCM1 when it receives temperature increase request DMN from modem 202 provided in house 200 Modem 202 transmits temperature increase request signal DMN in response to a detection result of sensor 206 detecting the user going out from house 200 More preferably temperature increase instruction genera tion unit 320 outputs temperature increase instruction WCM1 in response to a remote operation by the user operation of remote controller 360 portable telephone 380 or the like It becomes possible to change remaining SOC amount of change X1 in accordance with the power storage unit tem perature Tb1 or charge end time or running start time and therefore power storage unit 10 can be fully charged and the temperature of power storage unit can be increased within a short period of time from when SOC setting unit 322 received temperature increase instruction WCM1 Therefore tem perature of power storage unit 10 can more reliably be
8. unit 321 sets the amount of change X1 based on a difference between the power storage unit temperature Tb1 and the lower limit tem perature of power storage unit 10 By way of example remaining SOC calculating unit 321 stores a map defining correspondence of the amount of change X1 to the difference between the power storage unit temperature Tb1 and the lower limit temperature of power storage unit 10 and it may determine the amount of change by looking up the map Alternatively remaining SOC calculating unit 321 stores in advance SOC1B as the SOC of power storage unit 10 in the fully charged state and it may calculate current SOC of power storage unit 10 based on the US 8 089 243 B2 9 power storage unit temperature Tb1 charge discharge current value Ib1 and charge discharge voltage value Vb1 Here if the difference between SOCIB and the current SOC of power storage unit 10 is larger than the amount of change X1 calcu lated from the map remaining SOC calculating unit 321 sets the difference as the amount of change X1 The amount of change X2 is calculated in the similar manner as that for X1 SOC setting unit 322 sets the target SOC value to be applied to converter ECU 34 shown in FIG 1 SOC setting unit 322 sets the target SOC value of power storage unit 10 to for example 50 that is lower by the amount of change for example 30 from SOCIB for example 8096 before receiving the temperature increase i
9. which will be described later At step S14 SOC setting unit 322 receives temperature increase instruction WCM1 and changes the target SOC value from SOCIA first target value to SOC1B second target value Consequently power storage unit 10 is charged until it reaches the fully charged state and temperature increase of power storage unit 10 is realized 20 40 45 50 60 14 At step S15 temperature increase instruction generation unit 320 determines whether or not charge connector 60 has been opened That the charge connector 60 is opened means end of charging from commercial power supply to power storage unit 10 Temperature increase instruction generation unit 320 executes the process of step S16 if it receives a signal OP YES at step S15 and otherwise NO at step S15 it repeats the determination process of step S15 At step S16 temperature increase instruction generation unit 320 determines whether or not each of the power storage unit temperatures Tb1 and Tb2 is lower than the correspond ing lower limit temperature If the temperature of power storage unit at the start of temperature increase is significantly lower than the lower limit or if the power storage unit has high thermal capacity it is possible that both power storage unit temperatures Tb1 and Tb2 are lower than the correspond ing lower limit temperatures even after the power storage units are charged to the full charged state at step S14 By way of ex
10. 0 when a prescribed charging current is caused to flow Temperature increase instruction generation unit 320 determines the temperature increase start time based on the amount of change X1 the time change rate and the set time ST Other method of determining temperature increase start time may be available When the current time reaches the temperature increase start time temperature increase instruction generation unit 320 outputs temperature increase instruction WCM1 and ends the process of step S11 When the process of step S11 ends the process of step S14 which will be described later is executed If there is no input of set time ST NO at step S10 tem perature increase instruction generation unit 320 determines whether there is an input oftemperature increase request from outside step S12 Here outside means outside of the battery ECU 32 Further input of temperature increase request means input of any of smart door unlock signal SDU keyless door unlock signal KDU signals BON1 and BON2 from temperature increase button 400 and output signal MP from portable telephone 380 to temperature increase instruc tion generation unit 320 When there is an input of tempera ture increase request YES at step 512 temperature increase instruction generation unit 320 outputs temperature increase instruction WCM1 and executes the process of step S14 If there is no input of temperature increase request to tempera ture increase ins
11. 79 1 2005 JP A 2006 2 17757 8 2006 JP A 2008 117565 5 2008 Primary Examiner Bot Ledynh 74 Attorney Agent or Firm Oliff amp Berridge PLC 57 ABSTRACT A power supply device includes a power storage unit capable of being charged and a control unit controlling charging of the power storage unit Control unit includes a battery ECU for setting at the start of charging of the power storage unit a target value of state of charge of the power storage unit to a first value based on the condition of power storage unit and setting when a temperature increase instruction change instruction is received after the start of charging the target value to a predetermined second value higher than the first value and a converter ECU for executing the charging pro cess so that the state of charge of the power storage unit attains to the target value 10 Claims 8 Drawing Sheets EXTERNAL POWER US 8 089 243 B2 Sheet 1 of 8 Jan 3 2012 U S Patent dO vt Wa a sec enna nw econ ue se enne reuse eee enn seem e err 9 19 82 u3MOd x i a NE aa m ADVYOLS JAHA i m un 103 H3183ANOO aaya z Q f mn e x 6 LWMd 21 1Md ds A E m H3MOd 7 001 81 idi lid i Id U S Patent Jan 3 2012 Sheet 2 of 8 US 8 089 243 B2 FIG 2 POWER STORAGE UNIT 10 POWER STORAGE UNIT 20 U
12. Charge discharge voltage detection units 14 24 are con nected between the power line connecting power storage unit 10 to converter 18 and the power line connecting power storage unit 20 to converter 28 respectively detect charge discharge voltage values Vb1 Vb2 of power storage units 10 20 respectively and output the result of detection to control unit 30 battery ECU 32 and converter ECU 34 Temperature detection units 12 22 are arranged in the proximity of battery cells and the like constituting power storage units 10 20 respectively detect power storage unit temperatures Tb1 Tb2 which represent ambient temperatures of power storage units 10 20 and output the result of detec tion to battery ECU 32 It is noted that temperature detection units 12 22 may be configured to output a representative value obtained for example by averaging processing based on the result of detection by a plurality of detection elements arranged in correspondence with a plurality of battery cells constituting power storage units 10 20 Though it is prefer able to provide temperature detection units 12 and 22 in the 0 20 35 40 45 50 55 6 vicinity of power storage units 10 and 20 respectively these may be arranged for example to detect temperature outside the vehicle Battery ECU 32 calculates SOC State of Charge in respective power storage units 10 20 based on charge dis charge current values Ib1 Ib2 received from
13. S 8 089 243 B2 Sheet 3 of 8 Jan 3 2012 U S Patent 009 NOLLNG 3SV3HONI 09 YATIONLNOS JjLOW3H LINN NOLLVH3N39 NOILONYLSNI 3SV38HONI 3univaa3dWa eX AX 18 nas 3NOHd3141 318V 1HOd 086 091 191 IWOM 0 92 905 LINA ZAN LAA LINN ONILLAS 905 ONILV 1019 IVO 008 191 2181 1208 eaL 191 66 6914 U S Patent Jan 3 2012 Sheet 4 of 8 US 8 089 243 B2 FIG 4 INPUT SIGNAL SMART DOOR UNLOCK SIGNAL SDU KEYLESS DOOR UNLOCK SIGNAL KDU MANUAL TEMPERATURE INCREASE BUTTON ON SIGNAL CHARGE CONNECTOR OPEN SIGNAL OP REMOTE TEMPERATURE INCREASE BUTTON ON SIGNAL BON2 TEMPERATURE INCREASE REQUEST SIGNAL FROM HOUSE DMN SIGNAL FROM PORTABLE TELEPHONE MP US 8 089 243 B2 Sheet 5 of 8 Jan 3 2012 27 U S Patent 012 08 OVI OVA noa 153 034 3SV3HONI 144 3HnivH3adwWal E 191 3un1 vadat MO ruwn C 39 4015 u3MOd Luid 0 9914 US 8 089 243 B2 Sheet 6 of 8 Jan 3 2012 U S Patent 906 1 HOSN3S 1S3n03H ASVAYONI 1utdz OVvd 103 ve MOT LINN 39 4015 u3MOd 9914 U S Patent Jan 3 2012 Sheet 7 of 8 US 8 089 243 B2 FIG 7 START S5 ENTER NORMAL CONTROL MODE CALCULATE SOC CHANGE AMOUNT OF POWER STORAGE
14. US008089243B2 a2 United States Patent 10 Patent No US 8 089 243 B2 Ichikawa et al 45 Date of Patent Jan 3 2012 54 POWER SUPPLY DEVICE AND VEHICLE 56 References Cited INCLUDING THE SAME 75 Inventors Shinji Ichikawa Toyota JP Tetsuhiro Ishikawa Toyota JP 73 Assignee Toyota Jidosha Kabushiki Kaisha Toyota JP Notice Subject to any disclaimer the term of this patent is extended or adjusted under 35 U S C 154 b by 400 days 21 Appl No 12 310 985 22 PCTFiled Oct 9 2007 86 PCT No PCT JP2007 070040 371 91 2 4 Date Mar 13 2009 87 PCT Pub No WOZ2008 050623 PCT Pub Date May 2 2008 65 Prior Publication Data US 2010 0001866 Al Jan 7 2010 30 Foreign Application Priority Data Oct 24 2006 JP 2006 288874 51 Int CI H02J 7 14 2006 01 52 UIS CL 320 104 307 10 1 58 Field of Classification Search 320 10 1 320 104 307 10 1 See application file for complete search history POWER STORAGE STORAGE U S PATENT DOCUMENTS 6 163 135 A 12 2000 Nakayama et al 2001 0024104 9 2001 Suzuki 2002 0003417 1 2002 Bito et al FOREIGN PATENT DOCUMENTS JP A 06 141488 5 1994 JP A 08 098304 4 1996 JP A 09 168240 6 1997 JP A 11 026032 1 1999 JP A 2000 040532 2 2000 JP A 2000 092614 3 2000 JP A 2001 268719 9 2001 JP A 2001 3 14039 11 2001 JP A 2003 209969 7 2003 JP A 2004 260905 9 2004 JP A 2005 0274
15. ained power storage unit temperatures Tb1 and Tb2 is lower than the corresponding lower limit temperature step 52 If either one of power storage unit temperatures Tb1 and Tb2 is lower than the corresponding lower limit temperature YES at step S2 remaining SOC calculating unit 321 calcu lates the amount of change of SOC remaining SOC that is necessary to increase the temperature step S3 Remaining SOC calculating unit 321 calculates the amount of change amounts of change X1 X2 of SOC necessary to increasethe temperature of power storage unit as the object of temperature increase based on the current temperature of the power stor age unit Ifboth of power storage unit temperatures Tb1 and Tb2 are lower than the corresponding lower limit temperatures remaining SOC calculating unit 321 calculates the amount of change for the power storage unit of higher priority Further at step S3 temperature increase instruction gen eration unit 320 determines the temperature increase instruc tion to be output of temperature increase instructions WCM1 and WCM2 based on power storage unit temperatures Tb1 and Tb2 Inthe following by way of example temperature increase control of power storage unit 10 will be described SOC setting unit 322 determines the target SOC value of power storage unit 10 that is SOC1A first target SOC based on the amount of change X1 remaining SOC applied from remaining SOC calculating unit 321 step S4 At
16. ample if the temperature Tb1 of power stor age unit 10 is lower than the lower limit temperature YES at step S16 temperature increase instruction generation unit 320 outputs a temperature increase instruction WCM3 for further increasing the temperature Tb1 of power storage unit 10 step S17 Then SOC setting unit 322 changes the SOC target value from SOCIB to SOCIC where SOCIB SOCIC As a result power storage unit 10 is dis charged and heat generates in power storage unit 10 Thus the temperature of power storage unit 10 can further be increased Ifthe process of step S17 takes place part of electric power stored in power storage unit 10 is consumed for example by converter 18 inverter 3 and the like In most cases however the temperature Tb1 of power storage unit 10 should have increased close to the lower limit temperature as a result ofthe process at step S14 Therefore according to the present embodiment even if it becomes necessary to consume elec tric power stored in power storage unit 10 the amount of power consumption is small As another possible method of further increasing the tem perature of power storage unit 10 if the state of charge of power storage unit 20 is not full for example SOC setting unit 322 may set target values and SOC2C of power storage units 10 and 20 such that power is supplied from power storage unit 10 to power storage unit 20 According to this method though electric power is
17. art of the engine without using a mechanical key and represents one form ofthe wireless door lock mechanism More specifically when the smart door unlock function included in the smart entry system for example a function to unlock the door when the user carrying the smart key holds a handle outside the driver s seat in a sensing area outside the vehicle is actuated the body ECU generates smart door unlock signal SDU and transmits the signal to temperature increase instruction gen eration unit 320 In addition keyless door unlock signal KDU is adapted to a keyless entry system representing another form ofthe wire less door lock mechanism More specifically the body ECU generates keyless door unlock signal KDU and transmits the signal to temperature increase instruction generation unit 320 in response to unlock ofthe door as a result of actuation of the wireless remote control function contained in the key The third input signal is the signal BONI indicating that temperature increase button 400 is set to the ON state by a manual operation by the user Temperature increase button 400 is provided in the vicinity of the driver s seat in the vehicle and it is set to ON as a result of the user s manual operation or remote operation through the remote controller Then temperature increase button 400 transmits the tempera ture increase request from the user to temperature increase instruction generation unit 320 in response to setting to ON T
18. calculates said first value by subtracting said amount of change from said second value 2 The power supply device according to claim 1 wherein said change instruction generation unit determines a start time of starting change of the state of charge of said power storage unit based on a designated charge end time and said amount of change and when current time reaches said start time generates said change instruc tion 3 The power supply device according to claim 1 wherein said change instruction generation unit generates said change instruction in response to a temperature increase request input from outside 4 The power supply device according to claim 3 wherein said change instruction generation unit outputs said change instruction when it receives said temperature increase request from a transmission device provided in a house and US 8 089 243 B2 17 said transmission device transmits said temperature increase request in response to a result of detection by a sensor detecting a user going out from said house 5 The power supply device according to claim 3 wherein said change instruction generation unit outputs said change instruction in response to a remote operation by a user 6 A vehicle comprising a power supply device said power supply device including a power storage unit capable of being charged and a control unit controlling charging of said power storage unit and said control unit having a chan
19. charge discharge current detection units 16 26 charge discharge voltage val ues Vb1 Vb2 received from charge discharge voltage detec tion units 14 24 and power storage unit temperatures Tb1 Tb2 received from temperature detection units 12 22 Battery ECU 32 determines whether the temperature of power storage units 10 should be raised or not based on power storage unit temperatures Tb1 Tb2 received from tem perature detection units 12 22 respectively Specifically bat tery ECU 32 determines whether each of power storage unit temperatures Tb1 Tb2 is lower than a corresponding lower limit temperature such as 15 C Then battery ECU 32 carries out temperature increase control ofthe power storage unit of which temperature is lower than the corresponding lower limit temperature Battery ECU 32 sets SOC target value of power storage unit 10 to SOCIA before starting temperature increase of power storage unit 10 When temperature increase of power storage unit 10 is to be started battery ECU 32 changes the SOC target value from SOC1A to SOCIB Similarly battery ECU 32 sets target SOC of power storage unit 20 to SOC2A before starting temperature increase of power storage unit 20 When temperature increase of power storage unit 20 is to be started battery ECU 32 changes the SOC target value from SOC2A to SOC2B It is noted that SOC1A lt SOCI1B and SOC2A lt SOC2B Further the values of SOC1B and SOC2B are set to a pre scribed val
20. con tained in the DC voltage across line LN1B and negative bus LNIC The voltage conversion operation boost operation and down converting operation of converter 18 will be described hereinafter In the boost operation converter ECU 34 main tains transistor Q1B in the ON state and turns on off transis tor Q1A at a prescribed duty ratio During the ON period of transistor Q1A a discharge current flows from power storage unit 10 to main positive bus MPL sequentially through line LN1B inductor L1 diode D1B and positive bus LN1A At the same time a pump current flows from power storage unit 10 sequentially through line LN1B inductor L1 transistor Q1A and negative bus LN1C Inductor L1 accumulates elec tromagnetic energy by means of the pump current Succes sively when transistor QLA makes transition from the ON state to the OFF state inductor L1 superimposes the accumu lated electromagnetic energy onto the discharge current Con sequently the average voltage of the DC electric power sup plied from converter 18 to main positive bus MPL and main negative bus MNL is boosted by a voltage corresponding to the electromagnetic energy accumulated in inductor L1 in accordance with the duty ratio On the other hand in the down converting operation con verter ECU 34 turns on offtransistor Q1B ata prescribed duty ratio and maintains transistor Q1A in the OFF state During the ON period of transistor Q1B the charge current flows from mai
21. consumed by converters 18 and 28 the power consumption can be made smaller than in the above described method When the process of step S17 ends the temperature increase control process ends Further if power storage unit temperatures Tb1 and Tb2 are both not lower than the corre sponding lower limit temperatures at step S16 NO at step 516 the temperature increase control process ends After the end of temperature increase control process various pro cesses including start of vehicle operation are executed The embodiment of the present invention will be generally summarized again Power supply device 100 mounted on a vehicle includes power storage unit 10 that is capable of being charged and control unit 30 that controls charging of power supply unit 10 Control unit 30 includes SOC setting unit 322 which sets at the start of charging power storage unit 10 the target value of state of charge SOC of power storage unit 10 to SOCIA first value based on the condition of power storage unit 10 and when it receives temperature increase instruction WCM1 after the start of charging sets the target value to predetermined SOC1B second value higher than US 8 089 243 B2 15 and converter ECU 34 which executes the charging process so that the state of charge of power storage unit 10 attains to the target value As described above power storage unit 10 is charged to some extent and temperature increase control is performed
22. e and when current time reaches said start time generates said change instruc tion 8 The vehicle according to claim 6 wherein said change instruction generation unit generates said change instruction in response to a temperature increase request input from outside 9 The vehicle according to claim 8 wherein said change instruction generation unit outputs said change instruction when it receives said temperature increase request from a transmission device provided in a house and said transmission device transmits said temperature increase request in response to a result of detection by a sensor detecting a user going out from said house 10 The vehicle according to claim 8 wherein said change instruction generation unit outputs said change instruction in response to a remote operation by a user
23. e increase instruc tion by the user operating portable telephone 380 it would be more convenient for the user In response to these input signals temperature increase instruction generation unit 320 generates a temperature increase instruction WCM1 or WCM2 for the power storage unit of which temperature is lower than the corresponding lower limit temperature and outputs it to SOC setting unit 322 Temperature Increase Control Process As described above in the present embodiment power is exchanged between the commercial power supply and the power storage unit Therefore in the present embodiment it becomes possible to increase the temperature of power stor age unit without consuming electric power of the power stor age unit In the following temperature increase control in accordance with the present embodiment will be described In the following description however an example will be described in which temperature Tb1 of power storage unit 10 is lower than the lower limit value and hence temperature of power storage unit 10 15 increased The same operation as will be described in the following is performed to increase the temperature of power storage unit 20 FIG 5 is a block diagram illustrating power supply from the commercial power supply to the power storage unit Referring to FIG 5 the vehicle is connected to a power outlet of house 200 by a charge connector 60 through supply line ACL To the vehicle commercial power
24. e start of charging of the power storage unit the target value to a second value higher than the first value The charge processing unit executes a charging operation based on the target value Preferably information representing the condition of the power storage unit is information of temperature around the power storage unit The control unit further includes an amount of change calculating unit calculating an amount of change in state of charge of the power storage unit necessary to increase temperature of the power storage unit The target value setting unit stores the second value in advance and calculates the first value by subtracting the amount of change from the second value More preferably the change instruction generation unit determines a start time of starting change of the state of charge ofthe power storage unit based on a designated charge end time and the amount of change and when current time reaches the start time generates the change instruction More preferably the change instruction generation unit generates the change instruction in response to a temperature increase request input from outside More preferably the change instruction generation unit outputs the change instruction when it receives the tempera ture increase request from a transmission device provided in a house The transmission device transmits the temperature increase request in response to a result of detection by a sensor detecting a user going
25. er storage unit 10 con verter ECU 34 generates the switching instruction for converter 18 Further converter ECU 34 determines the target supply power PAC for the commercial power supply to be the charge power Pin1 for power storage unit 10 and outputs the target supply power PAC to drive ECU 50 Based on power difference between the applied target supply power PAC and the actual value of supplied power PAC drive ECU 50 gen erates switching instruction of inverter 44 It is noted that the actual value of supply power PAC is calculated by multiplying the supplied current IAC from supply current detection unit 54 by the supplied voltage VAC from supply voltage detection unit 52 Receiving the temperature increase request smart door unlock signal SDU keyless door unlock signal KDU or the like battery ECU 32 changes the target SOC value to be output to converter ECU34 from to SOCIB Then converter ECU 34 controls converter 18 such that the SOC value of power storage unit 10 attains to SOC1B Here con verter ECU34 changes the target charge discharge power P1 of power storage unit 10 based on SOCIB and based on power difference between the target charge discharge power P1 and the charge discharge power of power storage unit 10 changes the switching instruction PWC1 Further converter ECU34 changes the target supply power PAC charge power Pin1 to power storage unit 10 and outputs the target supply
26. ge instruction generation unit generating a change instruction instructing change of state of charge of said power storage unit based on information representing possibility of use of said vehicle by a user a target value setting unit setting when charging of said power storage unit starts a target value of state of charge of said power storage unit to a first value based on the condition of said power storage unit and setting when said change instruction is received after the start of charging of said power storage unit said target value to a second value higher than said first value and a charge processing unit executing a charging operation based on said target value wherein information representing the condition of said power stor age unit is information of temperature around said power storage unit said control unit further includes 20 25 18 an amount of change calculating unit calculating an amount of change in state of charge of said power stor age unit necessary to increase temperature of said power storage unit and said target value setting unit stores said second value in advance and calculates said first value by subtracting said amount of change from said second value 7 The vehicle according to claim 6 wherein said change instruction generation unit determines a start time of starting change of the state of charge of said power storage unit based on a designated charge end time and said amount of chang
27. get value setting unit stores the second value in advance and calculates the first value by subtracting the amount of change from the second value More preferably the change instruction generation unit determines a start time of starting change of the state of charge ofthe power storage unit based on a designated charge end time and the amount of change and when current time reaches the start time generates the change instruction More preferably the change instruction generation unit generates the change instruction in response to a temperature increase request input from outside US 8 089 243 B2 3 More preferably the change instruction generation unit outputs the change instruction when it receives the tempera ture increase request from a transmission device provided in a house The transmission device transmits the temperature increase request in response to a result of detection by a sensor detecting a user going out from the house More preferably the change instruction generation unit outputs the change instruction in response to a remote opera tion by a user Therefore according to the present invention a power supply device that can more reliably increase the temperature of power storage device while preventing decrease in energy efficiency can be provided BRIEF DESCRIPTION OF THE DRAWINGS FIG 1 is a schematic configuration diagram showing a substantial part of a vehicle including a power supply device 100 acco
28. he fourth input signal is the signal OP indicating that charge connector 60 shown in FIG 1 has been opened here inafter also referred to as the charge connector opening sig 20 25 30 35 40 45 50 55 60 65 10 nal For example charge connector opening signal OP is generated in response to removal of charge connector 60 from a power outlet provided on the house side by the user before the user uses the vehicle Generated charge connector open ing signal OP is transmitted from opening and closing detec tion unit 62 provided in charge connector 60 to temperature increase instruction generation unit 320 The fifth input signal is the signal BON2 indicating that temperature increase button 400 is set to the ON state by a remote operation using a remote controller 360 by the user The sixth input signal is the temperature increase request signal DMN generated by the user in the house to the vehicle By way of example temperature increase request signal DMN is issued when starting capability of the vehicle in an environment at a low temperature is desirably ensured by warming the power storage unit in advance before the user uses the vehicle The seventh input signal is the output signal MP from portable telephone 380 Generally a user more often operates portable telephone 380 than remote controller 360 There fore if temperature increase instruction generation unit 320 can be activated to generate the temperatur
29. ile motor genera tor MG2 may serve solely as the motor Drive ECU 50 executes a program stored in advance More specifically drive ECU 50 calculates torque target values TR1 TR2 and speed target values MRN1 MRN2 of motor generators MG1 MG2 based on a signal transmitted from each not shown sensor a running state variation in an accel erator position a stored map or the like Then drive ECU 50 generates switching instructions PWM1 PWM2 and controls inverters 40 42 such that generated torque and speed of motor generators MG1 MG2 attain torque target values TR1 TR2 and speed target values MRN1 MRN2 respectively In addition drive ECU 50 outputs calculated torque target val ues TR1 TR2 and speed target values MRN1 MRN2 to power supply device 100 In addition in the present embodiment inverter 44 is con nected to main positive bus MPL and main negative bus MNL in parallel to inverters 40 42 Inverter 44 is further electrically connected to a commercial power supply not shown in a house outside the vehicle through a supply line ACL and a charge connector 60 such that electric power can be supplied and received to and from the commercial power supply Receiving commercial electric power supplied from the outside ofthe vehicle through charge connector 60 and supply line ACL inverter 44 generates DC electric power for supply to power supply device 100 For example inverter 44 is implemented by a single phase inverter so as to
30. in accordance with the temperature increase instruction WCM1 so that it becomes possible to perform temperature increase control immediately before the use by the user As a result energy necessary for increasing the temperature of power storage unit 10 can be reduced and hence temperature of power storage unit 10 can more reliably be increased while preventing decrease of energy efficiency Itis noted that temperature increase instruction generation unit 320 corresponds to change instruction generation unit ofthe present invention and temperature increase instruction WCMI corresponds to the change instruction ofthe present invention Preferably the information representing the state of power storage unit 10 is the information of temperature around power storage unit 10 power storage unit temperature Tb1 Control unit 30 further includes remaining SOC calculating unit 321 calculating amount of change remaining SOC X1 ofpower storage unit 10 necessary for increasing temperature of power storage unit 10 SOC setting unit 322 stores SOCIB in advance and subtracts X1 from SOCIB to calculate SOCIA More preferably control unit 30 further includes tempera ture increase instruction generation unit 320 that generates temperature increase instruction WCMI Temperature increase instruction generation unit 320 determines a start time of starting change of state of charge of power storage unit 10 based on designated charge end time set
31. increased while preventing decrease of energy efficiency According to the present embodiment the vehicle includes any of the above described power supply devices This ensures charge discharge performance of power storage unit and therefore running performance of the vehicle can be improved In the description above power storage unit 10 may be replaced by power storage unit 20 temperature increase instruction WCMI by temperature increase instruction 0 an 5 20 25 30 40 45 50 65 16 WCM2 SOCIA and SOCIB by SOC2A and SOC2B power storage unit temperature Tb1 by power storage unit tempera ture Tb2 and amount of change X1 by amount of change X2 In that case effects similar to those described above can be attained for power storage unit 20 Further power supply device 100 shown in FIG 1 may be configured to include either one of power storage units 10 and 20 and a converter corresponding to the power storage unit Though temperature increase instruction generation unit 320 sets the temperature increase start time based on the input set time ST in the present embodiment temperature increase instruction generation unit 320 may be configures to allow cancellation of the setting in accordance with a user instruc tion Although the present invention has been described and illustrated in detail it is clearly understood that the same is by way of illustration and example only and is not to be taken by way
32. n positive bus MPL to power storage unit 10 sequen tially through positive bus LN1A transistor Q1B inductor and line LN1B Successively when transistor Q1B makes transition from the ON state to the OFF state magnetic flux is generated to prevent current variation in inductor L1 Accord ingly the charge current continues to flow sequentially through diode D1A inductor L1 and line LN1B Meanwhile from a viewpoint of electric energy it is solely during the ON period of transistor Q1B that the DC electric power is sup plied through main positive bus MPL and main negative bus MNL Therefore if the charge current is maintained constant ifinductance of inductor L1 is sufficiently large the average voltage of the DC electric power supplied from converter 18 to power storage unit 10 is set to a value obtained by multi plying the DC voltage across main positive bus MPL and main negative bus MNL by the duty ratio In order to control such a voltage conversion operation of converter 18 converter ECU 34 generates switching instruc tion PWC1 consisting of a switching instruction PWC1A controlling on off of transistor Q1A and a switching instruc tion PWCIB controlling on off of transistor Q1B 15 20 25 30 35 40 45 50 55 60 65 8 As the configuration and the operation of converter 28 are also similar to those of converter 18 described above detailed description will not be repeated Structure of Battery
33. nerative electric power output from the drive force generation unit Converters 18 28 are provided between main positive bus MPL main negative bus MNL and power storage units 10 20 and perform a voltage conversion operation between power storage units 10 20 and main positive bus MPL main nega tive bus MNL respectively More specifically converters 18 28 boost discharge electric power from power storage units 10 20 to a prescribed voltage for supply as drive electric power while they down convert regenerative electric power supplied from the drive force generation unit to a prescribed voltage for charging power storage units 10 20 For example converters 18 28 are implemented by a boost buck chopper circuit Power storage units 10 20 are connected in parallel to main positive bus MPL and main negative bus MNL with convert ers 18 28 being interposed respectively For example power storage unit 10 20 is implemented by a secondary battery configured to be capable of charge discharge such as a nickel metal hydride battery or a lithium ion battery or by an elec tric double layer capacitor Charge discharge current detection units 16 26 are inserted in the power lines connecting power storage units 10 20 to converters 18 28 respectively detect charge discharge current values Ib1 Ib2 used in charge discharge of power storage units 10 20 respectively and output the result of detection to battery ECU 32 and converter ECU 34
34. nerators MG1 MG2 and a drive ECU Electrical Control Unit 50 Inverters 40 42 motor generators MG1 MG2 and drive ECU 50 configure a drive force generation unit generating drive force of the vehicle In the present embodiment the vehicle runs by transmitting to wheels not shown drive force generated by electric power supplied to the drive force generation unit from power supply device 100 In addition during regeneration the vehicle causes the drive force gen eration unit to generate electric power from kinetic energy and recovers the electric power in power supply device 100 In the present embodiment power supply device 100 includes two power storage units Power supply device 100 supplies and receives DC electric power to and from the drive force generation unit through a main positive bus MPL and a main negative bus MNL 20 25 30 35 40 45 50 55 60 65 4 Inverters 40 42 are connected in parallel to main positive bus MPL and main negative bus MNL and supply receive electric power to from power supply device 100 That is inverters 40 42 convert drive electric power DC electric power received through main positive bus MPL and main negative bus MNL to AC electric power and supply the AC electric power to motor generators MG1 MG2 respectively In addition inverters 40 42 convert AC electric power gen erated by motor generators MG1 MG2 to DC electric power and supply the resultant DC electric p
35. nstruction WCM1 from temperature increase instruction generation unit 320 After receiving temperature increase instruction WCM1 SOC setting unit 322 sets the SOC target value to SOCIB When the temperature of power storage unit 20 is to be increased SOC setting unit 322 performs an operation similar to that described above The operation corresponds to the above described operation with temperature increase instruc tion WCM1 changed to temperature increase instruction WCM2 SOCIA to SOC2A and SOCIB to SOC2B FIG 4 shows signals input to temperature increase instruc tion generation unit 320 Referring to FIGS 3 and 4 seven signals in total are input to temperature increase instruction generation unit 320 The first and second input signals are smart door unlock signal SDU and keyless door unlock signal KDU These signals are signals transmitted from a body ECU not shown controlling lock unlock of the door to temperature increase instruction generation unit 320 as the signal indicating unlock of the door when the door ofthe vehicle is unlocked as a result of matching between an ID code included in a signal trans mitted from a wireless transmitter contained in the key and an ID code provided to the vehicle in the vehicle provided with a wireless door lock mechanism Specifically smart door unlock signal SDU is adapted to what is called a smart entry system which is a function to allow lock unlock of the door of the vehicle or st
36. out from the house More preferably the change instruction generation unit outputs the change instruction in response to a remote opera tion by a user According to another aspect the present invention pro vides a vehicle including a power supply device The power supply device includes a power storage unit capable of being charged and a control unit controlling charging of the power storage unit The control unit includes a change instruction generation unit a target value setting unit and a charge pro cessing unit The change instruction generation unit generates a change instruction instructing change of state of charge of the power storage unit The target value setting unit sets when charging ofthe power storage unit starts a target value of state ofcharge ofthe power storage unit to a first value based onthe condition ofthe power storage unit and sets whenthe change instruction 15 received after the start of charging ofthe power storage unit the target value to a second value higher than the first value The charge processing unit executes a charging operation based on the target value Preferably information representing the condition of the power storage unit is information of temperature around the power storage unit The control unit further has an amount of change calculating unit calculating an amount of change in state of charge of the power storage unit necessary to increase temperature ofthe power storage unit The tar
37. ower as the regenerative electric power to power supply device 100 By way of example inverters 40 42 are constituted of a bridge circuit including switching elements of three phases and generate three phase AC electric power by performing a switching circuit opening closing operation in response to switching instructions PWM1 PWM2 received from drive ECU 50 Motor generators MG1 MG2 are configured to be able to generate rotational drive force by receiving AC electric power supplied from inverters 40 42 respectively and to be able to generate electric power by receiving external rotational drive force For example motor generators MG1 MG2 are imple mented by a three phase AC electric rotating machine includ ing a rotor having permanent magnets embedded Motor generators MG1 MG2 are coupled to a power split device 46 The drive force generated at motor generators MG1 and MG2 are transmitted to wheels not shown via a drive shaft 48 If the drive force generation unit is applied to a hybrid vehicle motor generators MG1 MG2 are also coupled to a not shown engine through power split device 46 or drive shaft 48 Then drive ECU 50 carries out control such that an optimal ratio between the drive force generated by the engine and the drive force generated by motor generators MG1 MG2 is attained If the drive force generation unit shown in FIG 1 is applied to such a hybrid vehicle motor generator MG1 may serve solely as the generator wh
38. put of operational information control means carries out control such that an output current ofthe battery greater than a current required in the battery flows The heating up device disclosed in Japanese Patent Lay ing Open No 11 26032 increases battery temperature by the discharge of battery Therefore electric power stored in the battery is undesirably wasted The reference above however does not disclose any specific method to solve such a prob lem DISCLOSURE OF THE INVENTION An object of the present invention is to provide a power supply device that can more reliably increase temperature of power storage unit while preventing decrease in energy effi ciency In short the present invention provides a power supply device mounted on a vehicle including a power storage unit capable of being charged and a control unit controlling charging ofthe power storage unit The control unit includes a change instruction generation unit a target value setting unit and a charge processing unit The change instruction generation unit generates a change instruction instructing change ofstate of charge ofthe power storage unit The target an 5 20 35 40 45 55 65 2 value setting unit sets when charging of the power storage unit starts a target value of state of charge of the power storage unit to a first value based on the condition of the power storage unit and sets when the change instruction is received after th
39. rature increase instruction for the power storage unit higher in priority out of power storage units 10 20 Here priority is decided in accordance with a full charge capacity of the power storage unit SOC of the power storage unit and an amount of deviation of the power storage unit temperature from a prescribed operation temperature range As will be described later the signal input to temperature increase instruction generation unit 320 includes signals SDU KDU indicating that a door of the vehicle has been unlocked with a wireless door lock mechanism equipped in the vehicle signals BON1 BON2 indicating a state of opera tion of a temperature increase button 400 provided in the vicinity of a driver s seat in the vehicle signal OP indicating that charge connector 60 has been opened a signal DMN indicating a temperature increase request from a not shown house and an output signal MP from a portable telephone 380 As the information necessary for determining the tem perature increase start time an amount of change X1 in SOC of power storage unit 10 an amount of change X2 in SOC of power storage unit 20 and a charge end time set time ST set by the user are input to temperature increase instruction generation unit 320 Remaining SOC calculating unit 321 calculates the amount ofchange X1 of SOC necessary for increasing temperature of power storage unit 10 based on the temperature T15 of power storage unit 10 Remaining SOC calculating
40. rding to an embodiment of the present invention FIG 2 is a schematic configuration diagram of converters 18 and 28 according to an embodiment of the present inven tion FIG 3 is a functional block diagram of a battery ECU 32 shown in FIG 1 FIG 4 illustrates signals input to a temperature increase instruction generation unit 320 FIG 5 is a block diagram illustrating power supply from a commercial power supply to the power storage unit FIG 6 illustrates a configuration of a house 200 for trans mitting a temperature increase request signal from house 200 of FIG 5 to the vehicle FIG 7 is a flowchart for realizing temperature increase control by a battery ECU 32 shown in FIG 3 FIG 8 is a flowchart for realizing temperature increase control by the battery ECU 32 shown in FIG 3 BEST MODES FOR CARRYING OUT THE INVENTION Inthe following embodiments ofthe present invention will be described in detail with reference to the figures In the figures the same or corresponding portions are denoted by the same reference characters and description thereof will not be repeated Vehicle Configuration FIG 1 is a schematic configuration diagram showing a substantial part of a vehicle including a power supply device 100 according to an embodiment of the present invention Referring to FIG 1 the vehicle includes power supply device 100 a first inverter INVI 40 a second inverter INV2 42 a third inverter INV3 44 motor ge
41. step S4 SOC setting unit 322 determines SOC1A by subtracting X1 from the second target value SOC SOC1B of power storage unit 10 If power storage unit temperatures Tb1 and Tb2 are both not lower than the corresponding lower limit temperatures at step S2 NO at step S2 battery ECU 32 enters normal opera tion mode step S5 Then battery ECU 32 executes a process of step S15 which will be described later Here the normal operation mode means the control mode in which the power storage unit is charged without temperature increase control In that case SOC setting unit 322 sets only the second target SOC Next referring to FIGS 8 and 3 the process after step S4 will be described Temperature increase instruction genera tion unit 320 determines whether there has been a user input of set time ST step S1 If there has been an input of set time ST YES at step S10 temperature increase instruction gen eration unit 320 sets a temperature increase start time of power storage unit 10 such that temperature increase control US 8 089 243 B2 13 of power storage unit 10 ends power storage unit 10 attains to the fully charged state at the set time ST step S11 As already described the temperature increase start time is deter mined based on the amount of change X1 of SOC and on the set time ST For instance temperature increase instruction generation unit 320 stores in advance the time change rate of SOC of power storage unit 1
42. supplied through commercial power supply line 210 to house 200 is applied At this time power storage unit 10 as the object of temperature increase is charged by the commercial power from house 200 Therefore power storage unit 10 has its temperature increased because of self heat generation More specifically when charge connector 60 15 coupled to the power outlet of house 200 supply line ACL and commer cial power supply line 210 are electrically connected Converter ECU 34 generates a switching instruction PWC1 of converter 18 that corresponds to the power storage unit 10 as the object of temperature increase Converter ECU 34 determines a target supply power PAC for the commercial power supply and outputs it to drive ECU 50 Drive ECU 50 generates a switching instruction PWM3 of inverter 44 based on the applied target supply power Consequently power exchange between the commercial power supply and power storage unit 10 as the object of temperature increase starts US 8 089 243 B2 11 First battery ECU 32 sets the target SOC value of power storage unit 10 to SOC1A Converter ECU 34 controls con verter 18 such that the SOC value of power storage unit 10 attains to SOC1A Specifically converter ECU 34 determines a target charge discharge power P1 of power storage unit 10 based on Then based on power difference between the determined target charge discharge power P1 and the charge discharge power P1 of pow
43. t is applied from sensor 206 control unit 204 transmits the temperature increase request signal DMN to the vehicle through modem 202 Sensor 206 outputs the temperature increase request when for example the user going out is detected Various sensors may be used as sensor 206 For example if sensor 206 is a 20 25 30 35 40 45 50 55 60 65 12 sensor for detecting opening closing of front door sensor 206 outputs the temperature increase request when the user opens closes the front door In the vehicle modem 56 is connected between positive supply line ACLp and negative supply line ACLn enabling transmission reception of information to from house 200 Receiving the temperature request signal DMN transmitted from house 200 via modem 56 battery ECU 32 changes the target SOC value output to converter ECU 34 from SOC1A to SOCIB FIGS 7 and 8 are flowcharts for realizing the temperature increase control by battery ECU 32 shown in FIG 3 The process of the flowcharts are called from a prescribed main routine and executed at every constant time interval or every time prescribed conditions are satisfied Referring to FIGS 7 and 3 temperature increase instruc tion generation unit 320 and remaining SOC calculating unit 321 obtain power storage unit temperatures Tb1 and Tb2 from temperature detection units 12 and 22 step S1 Tem perature increase instruction generation unit 320 determines whether each ofthe obt
44. truction generation unit 320 NO at step 512 temperature increase instruction generation unit 320 executes the process of step S13 At step S13 temperature increase instruction generation unit 320 determines whether the driver user goes out or not As described above if the driver goes out a temperature increase request is transmitted from a sensor 206 provided in house 200 to control unit 204 Receiving the temperature increase request control unit 204 controls modem 202 and causes modem 202 to output temperature increase request signal DMN Temperature increase instruction generation unit 320 receives the temperature increase request signal DMN via modem 56 Specifically determination as to whether the driver user goes out or not by temperature increase instruction generation unit 320 corresponds to deter mination as to whether there is an input of temperature increase request signal DMN or not by temperature increase instruction generation unit 320 If temperature increase request signal DMN is input to temperature increase instruction generation unit 320 YES at step 513 temperature increase instruction generation unit 320 outputs temperature increase instruction WCM1 and thereafter executes the process of step S14 If temperature increase request signal DMN is not input to temperature increase instruction generation unit 320 NO at step S13 temperature increase instruction generation unit 320 executes the process of step S15
45. ue for example 8096 with which power storage units 10 and 20 are almost fully charged Converter ECU 34 generates drive signals and PWC2 for driving converters 18 and 28 respectively based on charge discharge currents Ib1 Ib2 charge discharge volt ages Vb1 Vb2 temperatures Th1 Tb2 of power storage units SOC SOCIA SOCIB SOC2A SOC2B from battery ECU 32 and the like Converters 18 and 28 are controlled by drive signals PWC1 PWC2 respectively Accordingly exter nal electric power is supplied through converters 18 and 28 to power storage units 10 and 20 respectively Thus power storage units 10 and 20 can be charged When the SOC target value of power storage unit 10 is SOCIB converter ECU 34 controls converter 18 in accor dance with the target value Here the temperature of power storage unit 10 increases as power storage unit 10 is charged The same applies to power storage unit 20 and when the target SOC value of power storage unit 20 is SOC2B con verter ECU 34 controls converter 28 in accordance with the target value Here the temperature of power storage unit 20 increases as power storage unit 20 is charged FIG 2 is a schematic configuration diagram of converters 18 28 according to the embodiment of the present invention Referring to FIG 2 converter 18 is constituted of a chopper circuit 180 and a smoothing capacitor C1 Chopper circuit 180 during discharge boosts the DC elec tric power recei
46. ved from power storage unit 10 in response to switching instruction PWC1 from converter ECU 34 while chopper circuit 180 during charging down converts the DC electric power received through main positive bus MPL and main negative bus MNL Chopper circuit 180 includes a positive bus LN1A a negative bus LN1C a line LN1B tran sistors Q1B representing a switching element diodes D1A D1B and an inductor L1 US 8 089 243 B2 7 Positive bus LN1A has one end connected to a collector of transistor Q1B and the other end connected to main positive bus MPL In addition negative bus LN1C has one end con nected to a negative side of power storage unit 10 and the other end connected to main negative bus MNL Transistors Q1B are connected in series between negative bus LN1C and positive bus LN1A Transistor Q1A has an emitter connected to negative bus LN1C and transistor QIB has the collector connected to positive bus LN1A In addition diodes D1A D1B allowing current flow from the emitter side to the collector side are connected between the collector and the emitter of transistors Q1B respec tively Further inductor L1 is connected to a connection point of transistor and transistor Q1B Line LN1B has one end connected to the positive side of power storage unit 10 and the other end connected to inductor L1 Smoothing capacitor C1 is connected between line LN1B and negative bus LN1C and reduces the AC component
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