SCTHV VME Model 203 User's Manual
Contents
1. 1 4 9 Error amplifier This block is based on the operational amplifier OP07C with a low input offset voltage The voltage regulation loop can be opened or closed by the micro controller When the loop is open then the series regulator is cut off Rev 1 3 July 2004 7 User s Manual VME HV 203 1 5 Specifications 3 Table 2 Nominal Data P Output voltage 0 500 V ME address mode Standard 24 bits oltage ramping rates 50 20 10 5 V s 1 6 Front panel Fig 3 The green LED in the center of the front panel indicates that the card is powered from the VME crate The reset button next to the green LED resets 1 restarts the card controller Four fully isolated channels provide output voltage via LEMO connectors ERA 0S 302 CLL numbered from 0 3 One red LED diode is located above each connector The diode is off when the corresponding channel is not powered After the channel 15 switched on but not set the LED blinks very slowly twenty times a minute The diode blinks also several times a second during the ramping up and about once a second during the ramping down of the channel voltage The LED stops blinking when the channel output voltage is stable 1 7 References 1 ATLAS Coll Specification for Atlas Silicon Microstrip Detectors for the Atlas Final Design Review ATLAS SCT Detector FDR 99 2 1999 2 The VME bus Handbook Third Edition Wade D Peterson 3 Atlas SCT HV Power Suppl2. STANDARD karta 0x000D addr unsigned char STANDARD karta 0x000D addr 16 channel continue switch OFF the channel case f if channel lt 0 ii unsigned char channel addr unsigned char STANDARD karta 0 0000 addr unsigned char STANDARD karta 0x000D addr channel continue channel gt 3 continue Rev 1 3 July 2004 VME HV 203 crate controller which reads r10n 3 520 00 2 means OFF the channel addr 0x01 addr 0x01 17 User s Manual VME HV 203 new settings for the channel voltage current trip limit and ramping rate case s if channel 0 channel gt 3 continue printf required voltage nnn n in V scanf SF amp rv do not change the sense of the following if rv lt 0 0 rv 0 0 if rv 500 0 printf max voltage 500 0 Vin rv 500 0 voltage int rv 10 0 voltdiv if lt 20 0 voltage voltage 1 vhigh voltage 256 vhighs unsigned char vhigh vlow voltages256 vlows unsigned char vlow printf enter current trip limit in uA scanf 1 amp maxcur if maxcur lt 0 maxcur 0 if maxcur gt 5000 printf max prad 5000 uA n maxcur 5000 for 1 0 1 lt 4 1 these are current trip limits two bytes for each probe resistor current double maxcur 1000 0 rl10n i 1 3 chigh current 256 cl
3. REGULATOR ERROR AMPLIFIER CONTROLLER CHANNEL CONTROLLER Figure 2 Block diagram of the HV channel 1 4 2 Trafo VME HV 203 OVER CURRENT PROTECT HV VOLTAGE CURRENT READOUT The high frequency transformer 52 kHz square wave has one primary winding for Uom of 58 V and three secondary windings of Uim 280V Ux 12V and U3 12V The ferrite core EF16 is made of N67 material by Simens Uzm and are auxiliary voltages supplying channel s circuitry 1 4 3 Rectifier multiplier and filter A typical voltage multiplier x2 1s based on two high speed diodes UF4007 BYG21M and two capacitors The high voltage RC filter is applied for a ripple reduction 1 4 4 Regulator The high voltage MOSFET power transistor BUZ78 of Upsmax equal 800 V catalogue value is used as series regulator Rev 1 3 July 2004 User s Manual 203 1 4 5 Over current protection An absolute hardware over current protection is set to 5 8 mA If the current exceeds this value the voltage 15 automatically reduced to keep the current below the limit This protection is independent on the programmable current trip limit which is described below 1 4 6 Voltage setting Micro controller can set the output voltage of the channel to the required value by setting the 10 bit serial DAC This setting is always controlled via the ramp up or ramp down procedure Ramp up and ramp down rates are to be chosen from several pres
4. for channel and card controllers respectively Card user does not communicate directly with these layers which can be treated as software emulated hardware functions 3 2 Channel microcontroller program description The program consists of the initialization part and of the endless loop part The initialization part is executed once after power up or after card reset which causes the channel microcontroller reset In this part various flags and initial conditions for timer serial communication port and interrupt services are set Five bits of the signed calibration constant for the ADC reference voltage which are wired into the channel circuitry are also read in and stored in this part of the program Main functions of the channel microcontroller program are realized in an endless loop in which the output voltage and current are permanently read from the corresponding channels of the 8 channel ADC These permanent measurements include application of the proportional ADC correction and overcurrent and overvoltage tests To keep the accuracy of the current measurements at required level over the very wide range of values program automatically selects also the optimal probe resistor This permanent loop is eventually interrupted by the card microcontroller requesting the current status and measurements or communicating new setting values In case of new setting request the permanent loop is extended with the ramping control function 3 3 Card microcont
5. issuing the READ command and reading the buffer My very rough estimation is that it should be a fraction of a milisecond Bits of the channel status byte have the following meanings bits 0 1 least significant bits contain the probe resistor number used for the current measurement bit 2 reserve bit 3 reserve bit 4 unstable voltage bit 5 unrecognized command bit 6 tripped for the overcurrent bit 7 tripped for the overvoltage Comments by Peter W Phillips 1 After switching on a channel one must wait some time for the processor to reach its nominal state before sending any further commands Experimentally this seems to be a large fraction of a second after sending the ON command Rev 1 3 July 2004 15 User s Manual 2 VME HV 203 NEVER send a ramp or status request to a channel which has not been switched on I repeat NEVER This completely screws up the communication between the processors In retrospect this should have been obvious Regarding the time which must elapse between writing the two bytes to request the status of a given channel and reading back the 10 bytes of data I find that this can be quite critical Too short and it doesn t work too long and it doesn t work Between a rock and a hard place Having deduced that the first of the ten data bytes represents the number of bytes which follow I modified the code to run the following loop nloop 0 nbyte 0 while nbyte 9 amp amp nloop
6. lt 100 wait rough fraction of mS for i 0 i lt 2000 1 jtt nbyte ip nloopt 1 3 July 2004 16 User s Manual 4 APPENDIX I Header file hvstd h define VME E EXTENDED 0x00000000 define VME STANDARD 0xFF000000 define VME SHORT The program file Simple communication programm in for and writes data from to HV_VME card include lt stdio h gt include lt math h gt include main argc argv int argc char argv unsigned char addr wsk double rv fvolt fcurr voltdiv 1 25 double r10n 4 int vlow vhigh int channel unsigned char unsigned char unsigned char unsigned char char c znak int i nbyte clow voltage status ramp chighr clowr ctriph 4 ctripl 4 mset lset mcorr lcorr ii Lala chigh current maxcur vlows ramping vhighs vlowr vhighr nb wype karta probe resistors for the current measurements r10n 0 75050 0 r10n 1 15050 0 r10n 2 3050 0 printf NnENTER CARD ADDRESSS as 2 hex 08 A1 e g scanf 2x amp karta karta karta 65536 for printf nn ON f OFF s SET r READ e g 2Nn scanf 5 switch c amp channel switch ON the channel e Case n if channel lt 0 channel gt 3 continue ii unsigned char channel addr unsigned char
7. program description 14 3 4 User program of the crate Controller cscssscccsscesssccscscsssescsccsescescccesesseessccessesssccssscessseseesssseees 14 3 4 1 Ini cR E A E E TON 15 45 APPENDIX e 17 Rev 1 3 July 2004 3 User s Manual VME HV 203 GENERAL INFORMATION 1 1 Introduction This manual describes the elements of the SCT High Voltage Power Supply VME Model HV203 its operation and installation procedures 1 1 1 Warranty IFJ will repair or replace the module within the guarantee period one year from date of shipment if the Guarantor declares that the product is defective due to workmanship or materials and has not been caused by mishandling negligence on behalf of the User accident or any abnormal conditions or operations 1 1 2 Contacts In case of questions or problems contact the card designers Stefan Koperny tel 48 12 617 4734 E mail koperny uci agh edu pl Edward Gornicki ifj edu pl tel 48 12 662 8027 Piotr Malecki ifj edu pl tel 48 12 662 8021 Fax 48 12 662 8458 Mail address INSTITUTE of NUCLEAR PHYSICS PAN ATLAS EXPERIMENT LABORATORY ul Radzikowskiego 152 PL 31 342 KRAKOW POLAND www ifj edu pl ATLAS sct scthv 1 2 General Description The VME SCT High Voltage Power Supply is designed to provide the bias voltage for ATLAS SCT modules 1 The HV203 model is a 1 uni
8. 2004 12 User s Manual VME HV 203 2 4 Operating Environment 2 4 1 Airflow and Cooling Standard VME crate airflow is required to maintain the operating temperature within specifications of the board Failure to adhere to these requirements may result in poor long term reliability 2 4 2 Power Requirements T5V 300 mA 12 900 mA 12V 900 mA 2 5 Cables To connect any HV output to load a cable one side ended by LEMO plug FFA 0S 302 CLAK 52 CERN Store SCEM No 09 31 30 060 4 must be used Particularly for ATLAS SCT application for interconnection to SCT LV 2 or SCT LV 3 module cable shown in Fig 6 can be delivered on request 0 5m length default FEMALE CANON D SUBI5 1 male pin red HV Bias CHO 2 female white HV Ret CHO 1 male pin red HV Bias CH1 2 female white HV Ret CH1 HV Ret CHO HV Bias CHO HV Ret CH1 HV Bias CH1 Figure 6 LV HV interconnection cable Rev 1 3 July 2004 13 User s Manual 203 3 PROGRAMMING INFORMATION 3 1 Introduction Operations of the VME SCTHV four channel power supply card are controlled by software which is loaded into program memories of the channel microcontrollers the card microcontroller and the VME crate controller Two lower layers of this software system programs of the channel and card controllers are written in assembler for microcontollers of the family 51 and are loaded into flash memories of the ATMEL 89C2051 4 and 89C52 5
9. NEVER allow to set more then 500 V and 5000 micro Amps Observe also that over current trip limits are recalculated for four different probe resistors as in the attached program SET command requires that ALWAYS whole chain of 13 bytes is send to the bus control byte command channel byte 2 bytes of voltage 8 bytes for the current limits and 1 byte of ramping rate code After the command is transmitted the card controller passes it to the corresponding channel and the channel starts ramping Observe that the current trip limit has to take into an account the maximum current which may occur during the process of ramping as the test is executed permanently Reading the channel The channel processor reads the voltage and the current permanently It also takes care of automatic selection of one of four probe resistors to keep the measurement accuracy on adecent level Status byte and results of measurements are reported by every active channel to the card controller on its frequent requests Reading the channel by the VME consists of e sending two bytes control byte and command channel byte e receiving 10 bytes control byte status byte two bytes of voltage readout two bytes of current reading and four debug bytes for technical use Please be sure that the proper number of bytes is written and read and that the binary to floating point numbers are converted as shown in the program example One also needs to allow for certain time delay between
10. Report No 1947 SCTHV VME Model 203 User s Manual E G rnicki S Koperny P Malecki Faculty of Physics and Nuclear Techniques of the AGH University of Science and Technology Cracow SCT HV Model HV203 User s Manual Rev 1 3 User s Manual 203 Institute of Nuclear Physics declines all responsibility for damages or injuries caused by an improper use of the module due to negligence on behalf of the User It is strongly recommended to read thoroughly the Users Manual before any kind of operation IFJ reserves the right to change partially or entirely the contents of this Manual at any time and without giving any notice Rev 1 3 July 2004 2 User s Manual VME HV 203 1 GENERAL INFORMATION rere orco oni pn pe re ais 4 1 1 ODUM CU ON P MG 4 1 1 1 A e er eet e pee 4 1 1 2 CONTA CAS cuti A e eut eati ete teat e ema tute etit 4 1 2 General Description 4 1 3 II AN 5 1 3 1 Card o e DUE RERO Eds 5 1 3 2 Card Addressing pce et ter a tei e 5 1 3 3 Square Wave 4 esce ete ete OL ET 5 1 4 Single Channel Description eee eee eee ee eese essent tasto seta seta e zzare 5 1 4 1 E EE 5 1 4 2 dbi TN 6 1 4 3 Rectifier multiplier and
11. an eight position switch which is used to control 16 A23 address bits see Fig 5 Position numbered with 1 corresponds to the least significant bit of the corresponding part of the address ON for a given position means that the corresponding bit is ZERO So e g setting the positions 2 and 4 ON and all others OFF corresponds to the part of address equal to OxF5 A23 5 setting Al6 Figure 5 VME Base Address DIP Switch 2 3 3 Module calibration The module is calibrated ADC reference voltage correction is set by jumpers and DAC correction is made by software for each channel User calibration may be required in case of ADC MAX192 replacement Follow this procedure to do it 1 Set 500V for the channel 2 Wait for about 30 min 3 Test output voltage use at least 4 dig voltmeter for 500V 4 Ifthe difference between digital output from computer and output from voltmeter is less then 0 1V the channel is correctly calibrated if it is bigger go to step 5 5 Two pads named 05 bottom side of the board should be shorted if output voltage is lower then 500V or opened if higher then 500V 6 Setappropriate number of bits to reach 500V where 1bit corresponds to 125mV Jumper positions form the binary value When jumpers are set e g in positions 04 and 03 then it means that the correction value is equal to 12 bits Correction equal to 5 bits require jumpers in positions 01 and 03 1 3 July
12. card controller It receives commands from the VME controller 2 and communicates with microprocessors of all channels located on the card Communication with channels is realized via internal serial interfaces operating in the full duplex mode asynchronously at 2 Mbaud rate Transmission of bytes between card controller or channel controllers is buffered and serviced with the help of interrupts 1 3 2 Card Addressing For the full version the standard addressing mode is used The card address corresponds to the eight address lines A16 A23 and can be set via the dip switch on each card see chapter 2 3 2 1 3 3 Square wave generator Square wave generator is built on PWM Pulse Width Modulator chip SG3526 and two transistors IRF520 The chip s outputs OUTA pin 13 and OUTB pin 16 are set by potentiometers T by P91 t by P90 as shown in Fig 1 t 8us gt Figure 1 PWM outputs timing 1 4 Single Channel Description The single channel block diagram is shown in Fig 2 It can be seen that the channel s full isolation is realized by optocouplers in the communication line and by transformer in the supply line 1 4 1 Switch The micro relay ZETTLER AZ850 5 or equivalent controlled by the card processor is used to turn power on or off for the channel s transformer Rev 1 3 July 2004 5 User s Manual RECTIFIER MULTIPLIER FILTER SQUARE E WAVE SWITCH GENERATOR SETTING CARD
13. cond is enough addr unsigned char STANDARD karta 0 0000 nb addr status addr vhighr addr vlowr addr chighr addr clowr addr the following 4 bytes are for technical debug them mset addr lset addr mcorr addr lcorr addr printf STATUS 2x status voltage vhighr 256 vlowr fvolt voltdiv double voltage 10 0 current chighr 256 clowr i int status amp 0x03 fcurr 1000 00 double current r10n i 1 3 printf An voltage 6 1f current 6 2f n fvolt fcurr continue default printf Anwrong commandNn continue te Rev 1 3 July 2004 19
14. e HV203 board uses CMOS components that are susceptible to damage if exposed to static electrical charges To avoid damage of these components during handling testing or operation the following procedure should be used Device leads should contact conductive material to avoid building of any static charge except during testing or operation e Soldering iron tips metal fixtures tools used in preparing the module for operation should be grounded e Module should never be removed or inserted while power is applied to the module because voltage transients may permanently damage it 2 3 2 Address setting The module works in A24 mode this means that the module address must be specified in a field of 24 bits The Address Modifiers recognised by the module are AM 39 Standard user data access AM 3A Standard user program access AM 3D Standard supervisor data access AM 3E Standard supervisor program access Before inserting the VME HV203 board into a VME crate the VME base address must be set The module s Base Address is fixed by DIP switch located on the board see Fig 4 Rev 1 3 July 2004 10 User s Manual VME HV 203 189652 CONNECTOR cm or y E Aus VME Base Address DIP switch uos PU su pe SQUARE WAVE GENERATOR mo 205 Figure 4 HV203 component side view Rev 1 3 July 2004 User s Manual 203 This is
15. ee e een OR D Ca tet ge e e natin en 6 1 4 4 cu e Re ER HEU La COR GER e RR CIR EN REIN YU Y 6 1 4 5 Over current protection tee lt eite e ee ROR e vy dep a SRE C ee t 7 1 4 6 Voltage setting 7 1 4 7 Optocouplets xo eie tee e NS eet e vette us A 7 1 4 8 Voltage and current readout uie eR e La BR ER RTI e its 7 1 4 9 Error ampli eee OR OR a Re a cod QUA T 7 1 5 Specifications 3 eot edo eret IE cussed eye ee AAA 8 1 6 Front 3 por 8 1 7 GA NN 8 2 INSTALLATION la 10 2 1 Unpacking and Inspection eese ee eee ee eese eese cazz cone see 10 2 SEN E A ATENEA A 10 2 3 Hardware preparation 10 2 3 1 Handling procedure banca hada EUR Pee o 10 2 3 2 Address Setting ii QR RR ERN d 10 2 3 3 Module Calibration asas aee Sonata ded m uie tote qute a E ii 12 2 4 Operating 13 2 4 1 Airflow anid a A RV aret e as 13 2 4 2 Power Requirements iui Lilia ve tin ie a RN ees 13 2 5 erg e 13 3 PROGRAMMING INFORMATION 14 3 1 TIO fea 14 3 2 Channel microcontroller program descripti0N ooooomoomsssssssssss es 14 3 3 Card microcontroller
16. et values It may happen that the ramp down rate will be determined by the time constant of the circuit rather than by the controller Preset values are 5 V s 10 V s 20 V s and 50 V s 1 4 7 Optocouplers Two optocouplers 6N137 operating at 2 Mbaud inserted into the serial asynchronous and duplex communication line provide electrical isolation between card and channel micro controllers 1 4 8 Voltage and current readout The channel micro controller continuously reads the output voltage and current using 12 bit multichannel ADC MAX192 The output voltage is measured with high precision voltage divider Output current of the channel may vary from tens of nA to 5 mA Every channel is equipped with the multi range current readout system A particular range is selected by the channel micro controller to keep the readout accuracy high These ranges are partially overlapping One measurement cycle of voltage and current takes about 20 ms The accuracy of the voltage measurements can be estimated from the following algorithm 0 1 of the reading 2 digits and similar for the current accuracy 1 of reading 2 digits where the significance of a digit is shown in column resolution in Table 1 for all ranges Table 1 Range and resolution of voltage and current measurement RANGE RESOLUTION Voltage 512 1dgt 125 mV 41 97 pA 1dgt 10 24 nA Current 209 2 1dgt 51 07 nA 1 029 mA 1dgt 251 4nA 5 945 mA ldgt 1 451 uA
17. hannel data A very simple example of a C programme used by designers for the VME crate with crate controller operating under OS9 system is given in the Appendix 1 and may serve as detailed information for programmers As the SCT community uses NI VME PCI interfaces and corresponding Peter W Phillips programmes as certain standard we strongly recommend to observe his comments incorporated at the end of this Section Rev 1 3 July 2004 14 User s Manual VME HV 203 3 4 1 Functions The following description 15 important for preparing a program which allows to control the card It is important that information passed from the user to the card controller via VME bus are prepared as described It is also important that the number of bytes transmitted at every operation is exactly as described Attached to this description Appendix 1 is an example of a simple C program which was used by card designers Channel ON Two bytes are send to the card controller The first one is always 1 means the number of bytes following The second one contains a channel number 0 3 and command code Channel OFF As above Setting the channel The user specifies three values nominal voltage in V current trip limit in micro Amps ramping rate code 0 no ramping 1 50 V s 2 20 V s 3 10 V s 4 5 V s This numbers have to be converted to binary representations according to the attached program It is also important that the maxima are observed One should
18. ow current 256 if chigh gt 15 chigh 0x0F clow 0xFF printf 02 02 chigh clow ctriph i unsigned char chigh ctripl i unsigned char clow printf rumping rate code scanf Sd amp ramping 4 slowest i e 10V s 1 fastest secret 0 no ramping if ramping 0 ramping 0 if ramping gt 4 ramping 4 ramp ramping write it down to VME bus addr unsigned char STANDARD karta 2 channel 1 addr 0x0C addr unsigned char STANDARD karta 0 0000 addr 32 channel addr vhighs addr vlows addr ctriph addr c addr c addr c addr c addr c addr c addr c addr ramp continue CE EE TSE TES E EA A E ry H de READ the channel status voltage current some more channel gt 3 continue STANDARD karta 2 channel 1 case r if 1 lt 0 addr unsigned char VM addr 0x01 addr unsigned char STANDARD karta 0x000D addr 48 channel bl Rev 1 3 July 2004 18 User s Manual 203 for the following I need some time before card controller s ready with readdressing a buffer corresponding to the requested channel for 1111 0 1111 lt 200 1111 wype 1 purposes One must read I guess that a fraction of milise
19. roller program description The card controller program realizes the communication functions between the user program residing in the crate controller and channel microprocessors Its organization 1s similar to the channel program The part executed after power up or reset initialize timers ports and various flags as well as clears the input buffer ready for new settings and four output data buffers one for each channel The permanent loop is almost idle Its main role is in some arbitration in case of conflicting transport requirements Interrupts may come from the crate controller requesting current status and measurement data from a given channel from the crate controller sending new settings for a channel from the crate controller requesting switching ON or OFF the given channel from the channel controller confirming the reception of new settings from the channel controller sending the requested channel status and measurements from the timer which takes care of frequent interrogation of active channels for the current data 3 4 User program of the crate controller The crate controller program allows to handle and control our SCTHV power supply cards It is usually written in C and depends in details on the operating system used to control the VME crate It should provide the user with four principal functions to switch channel ON or OFF to set the required voltage ramping rate and over current trip limit and to read the current c
20. t wide 6U height standard board It houses 4 fully isolated channels VME interface and square wave generator The system provides digitally controlled stable bias voltage in 0 500 V range and a precise measurement of the output current A maximum load of each channel is 5 mA A current trip limit can be set independently for every channel in the range from hundreds of nA to the maximum of 5 mA Another parameter which can be selected individually for each channel is the ramping speed with which the nominal voltage is changed Ramping speed is digitally controlled and can be selected from a very wide range Single channel functions are controlled by programmable microprocessor which communicates with a programmable card controller via fast serial link Communication with the crate controller for the VME version uses standard addressing mode Reaction times of processors to various conditions like requirement of a new setting over current and over voltage trips etc are well below 1 ms Rev 1 3 July 2004 4 User s Manual VME HV 203 1 3 Card Description One 6U card of the multichannel system of HV power supplies contains four identical channels Some elements located on the card serve all channels the card controller the VME interface square wave generator and circuits responsible for the distribution of power supplied by the power pack of the crate Fig 2 1 3 1 Card Controller The ATMEL flash microprocessor AT89C52 5 1s used as the
21. y Project Specification ver 2 04 http www 1fj edu pl ATLAS sct scthv HVSpec_01Feb26 pdf 4 ATMEL Data Sheet 8 bit Microcontroller with 2k Bytes Flash AT89C2051 5 ATMEL Data Sheet 8 bit Microcontroller with 8k Bytes Flash AT89C52 Rev 1 3 July 2004 8 User s Manual VME HV 203 PO Y Power Reset ON Figure 3 Front panel of the HV203 model Rev 1 3 July 2004 9 User s Manual VME HV 203 2 INSTALLATION 2 1 Unpacking and Inspection Unpack module from shipping carton If carton is damaged upon receipt request that the carrier s agent be present during unpacking and inspection of the equipment Refer to packing list and verify that all items are present Save packing material for storing or reshipping the equipment 2 2 Safety Operating with HV203 board requires that everybody should keep the working rules for high voltage For the safety reason VME crate must be grounded Handling safety is obtained through careful design There is no high voltage on the printed circuit board at solder side HV components on component side are covered by heatsinks so that the user cannot accidentally be exposed to it so far the board is placed into a VME crate repairing must be done by qualified person 2 3 Hardware preparation The HV module should be inspected and prepared prior to system installation The following sections describe the proper address setting necessary for system operation 2 3 1 Handling procedure Th
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