CN110376501A - A kind of multichannel cascading power source drive module - Google Patents
A kind of multichannel cascading power source drive module Download PDFInfo
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- CN110376501A CN110376501A CN201910729248.4A CN201910729248A CN110376501A CN 110376501 A CN110376501 A CN 110376501A CN 201910729248 A CN201910729248 A CN 201910729248A CN 110376501 A CN110376501 A CN 110376501A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
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- Power Engineering (AREA)
- Testing Of Individual Semiconductor Devices (AREA)
Abstract
The invention discloses a kind of multichannel cascading power source drive modules, which is characterized in that including multiple electric power driving modules, each electric power driving module includes a signal output interface, a connecting terminal and a communication terminal；It is in parallel with upper PC machine that each electric power driving module passes through communication terminal respectively；Wherein, each electric power driving module includes microcontroller, power module, D/A converter, DC/DC controller, voltage multiplying rectifier filter circuit, current detection module, voltage detection module, temperature detecting module and parameter memory module；Then the microcontroller generates a digital control amount according to the deviation of output voltage and setting value and sends it to D/A converter for correcting the output voltage of power module according to environment temperature；D/A converter is connect with DC/DC controller；DC/DC controller is connect with voltage multiplying rectifier filter circuit；The output end of voltage multiplying rectifier filter circuit is connect through current detection module with SiPM.
Description
Technical field
The present invention relates to technical field of photoelectric detection more particularly to a kind of multichannel cascading power source drive modules.
Background technique
Silicon photomultiplier (Silicon PhotoMultiplier, SiPM) is worked under Geiger mode angular position digitizer by multiple
Avalanche diode composition.Although silicon photomultiplier is substantially a luminescent semiconductor device, it has excellent photon
Numerical ability can be used for the occasion of pole Dim light measurement.It can work at low voltage, and there is high-gain, high photon detection to imitate
The features such as rate, quick response and excellent temporal resolution and wide spectrum response range.Its measurement in photon count levels
In have good performance, and have stronger anti-magnetic interference and mechanical resistant impact characteristics.In addition the radiation of silicon photomultiplier
Property background it is low, detected etc. in Low backgrounds experiment in neutrino and dark matter and receive more and more attention.Currently, in the world
Carry out application study of the silicon photomultiplier in Detector for High Energy Particles, is put into BELLE (RICH), T2K
(ND280), the experiment of the particle physics such as KLOE (QCAL), ILC (HCAL), CEPC (ECAL, HCAL) and MAGIC, EUSO, HERD etc.
Detector upgrading, the beforehand research plan of particle astrophysics experiment.Due to the limitation of manufacturing process, silicon photomultiplier has individual
Sex differernce.Therefore it in large-scale application silicon photomultiplier, usually requires that and detailed survey is carried out to each silicon photomultiplier
Examination, to obtain their own performance parameter information, filters out performance parameter element not up to standard, thus utility qualification
The detector array of silicon photomultiplier construction large area.Therefore it is faced with the difficulty that high-volume screens silicon photomultiplier.Example
As according to annular electron-positron collider (the Circular Electron Positron for being in predevelopment phase
Collider, CEPC) conceptual design report, the reading area of the electromagnetic calorimeter used, end cap and bucket portion is about 2430
Square metre, correspondence is about needed using 11,000,000 channel silicon photomultipliers；The reading area of hadron calorimeter, end cap and bucket portion
About 6000 square metres, rough estimate is needed using 60,000,000 channel silicon photomultipliers.It is external to be currently in beforehand research
Being tested without the double beta decay experiment nEXO of neutrino for stage, it is positive to intend to use area up to 4-5m2Silicon photomultiplier battle array
Column construction liquid xenon detector, read-out channel number are up to 40,000 multichannels.The above is shown based on the application of silicon photomultiplier
It is a trend of future development using silicon photomultiplier building large area detector.But it is current domestic for test silicon light
Electricity multiplication tube apparatus is mainly directed towards single built-in testing, and system structure is complicated, and testing efficiency is low, and the degree manually participated in is high, nothing
Method realizes quickly and effectively automatic test, causes test single-chip to spend the time longer, it is also difficult to effectively be extended to multi-pass
Road test device, the difficulty that therefore, it is difficult to overcome batch testing silicon photomultiplier to encounter, to constrain silicon photomultiplier
Large-scale application.
The photoelectric detector that silicon photomultiplier gets up as newly-developed, it the shortcomings that be also obviously, than
Such as dark noise counting rate is high, crosstalk coefficient is big, afterpulse rate is big.These parameters are not only in silicon photomultiplier performance test
Need to screen the foundation of silicon photomultiplier when the object and batch testing of primary study.The property of silicon photomultiplier simultaneously
Can be affected by environment larger, in order to guarantee silicon photomultiplier gain stability, need to carry out voltage-temperature to silicon photomultiplier
Degree amendment.
Summary of the invention
The present invention provides a kind of multichannel cascading power source drive module, for silicon photomultiplier match and batch
Performance test.The electric power driving module includes high-precision power, temperature-compensation circuit, signal the output electricity for SiPM work
Road.The effect of high-precision power is that external power supply+5V voltage is increased to the operating voltage of silicon photomultiplier needs.Consider
To the photomultiplier tube operating voltage in order to adapt to different producers, voltage output range is between 20-90V.Temperature-compensating electricity
The effect on road is amendment gain unstability as caused by temperature change.The gain of SiPM lowers meeting as the temperature rises
Measurement error is caused to increase.And the gain of SiPM can increase with the raising of operating voltage, the principle of temperature-compensation circuit is
When detecting SiPM temperature change, the operating voltage of SiPM is adjusted in time according to the temperature-voltage corrected parameter of precognition to support
Disappear the change in gain as caused by temperature change.By the regulatory function of this circuit, silicon photomultiplier is substantially reduced in number
According to the charge error in measurement.The effect of signal output apparatus be by silicon photomultiplier signal after amplifying to a certain degree,
It is exported with specific interface and impedance.
The technical solution of the present invention is as follows:
A kind of multichannel cascading power source drive module, which is characterized in that including multiple electric power driving modules, each power drives
Module includes a signal output interface, a connecting terminal and a communication terminal；Each electric power driving module passes through communication terminal respectively
It is in parallel with upper PC machine, for electric power driving module current output voltage described in Real-time Feedback, output electric current and environment temperature；Its
In, each electric power driving module includes microcontroller, power module, D/A converter, DC/DC controller, voltage multiplying rectifier filter
Wave circuit, current detection module, voltage detection module, temperature detecting module and E2PROM parameter memory module；
The microcontroller, for correcting the output voltage V of power module according to environment temperatureOUT, then according to voltage VOUT
And the deviation of setting value generates a digital control amount and sends it to D/A converter；
D/A converter, for the digital control amount received to be converted into the feedback electricity that analog quantity is applied to DC/DC controller
Press input terminal；
DC/DC controller, the duty ratio for changing PWM according to the analog signals that receive make output voltage stabilization to setting
Voltage multiplying rectifier filter circuit is sent to after fixed number value；
The output end of voltage multiplying rectifier filter circuit is connect through current detection module with SiPM；
Current detection module, the current information for will test are sent to the microcontroller；
Voltage detection module is sent to the microcontroller for monitoring the voltage of SiPM, and by voltage signal；
Temperature detecting module, for detecting the temperature of SiPM local environment and sending it to the microcontroller；
E2PROM parameter memory module is connect with the microcontroller, for storing setting benchmark job voltage, the ginseng of SiPM
Examine temperature, temperature-voltage correction factor.
Output voltage VOUT=VSET+△T×TC；Wherein, VSETIt is the setting benchmark job voltage of SiPM, Δ T is with reference to temperature
The deviation of degree and actual measurement environment temperature, TCIt is the temperature-voltage correction factor of SiPM.
Further, the operating voltage using single supply low-voltage as the microcontroller.
Further, several CPU timers of setting in the microcontroller, wherein a CPU timer be used for for data acquisition,
Control period timing.
Further, a SCI module is set in the microcontroller, for sending micro controller data to upper PC machine.
Further, which gives the data transmission of microcontroller to upper PC by RS-422 serial communication bus
Machine；Communication network is formed using the bus connecting mode of one master and multiple slaves between upper PC machine and each electric power driving module.
Further, the D/A converter is the analog-digital converter of multiple input path, wherein being used for using an input channel
Receiving the microcontroller is measurement temperature, is used to receive the load current of the microcontroller using an input channel.
Further, the signal output interface is SMB signal output interface；The communication terminal is RS-422 communication terminal
The address of electric power driving module is arranged by the toggle switch of RS-422 communication terminal for son；Upper PC machine and each power supply drive
Dynamic model block passes through RS422 protocol.
A kind of silicon photomultiplier batch testing method, which is characterized in that one is arranged in the upper PC machine and controls journey slowly
Sequence, power drives software, data processor and an application program；
1) initial phase: slow control program remotely adjusts benchmark work of each electric power driving module under reference temperature
Make voltage and diode light intensity；The driving plate voltage and configuration file of default are preserved in each electric power driving module load；Respectively
SiPM receives the optical signal of corresponding diode respectively, and the signal of generation is transmitted to the reading electronics on electric power driving module
It learns, then generates waveform and real-time display according to the data of read-out electronics output, confirm SiPM, light source and the equal work of power supply to be measured
Make normal；
2) test phase: raw with preset step-length stepping according to the voltage range to be scanned first with power drives software
At scan table, every voltage scanning point stops a setting time for application program and obtains waveform access, and is transmitted to number
According to processing routine, and generate corresponding histogram；Benchmark job voltage and its corresponding histogram are stored in by data processor
In database, each tested SiPM is filtered out from database and obtains the operating voltage value of optimum resolution and is saved in configuration text
Part；Then application program drives optimum voltage write-in corresponding power according to the address of the configuration file and each electric power driving module
In module.
Compared with prior art, the positive effect of the present invention are as follows:
Drive module of the present invention can correct the gain unstability as caused by temperature change；The present invention is wide by pulse
Degree modulation (PWM, Pulse Width Modulation) mode, adjustment duty ratio keep power supply output services range wider: 20-
90V (50-90V of shore pine), therefore power module is applicable to the silicon photomultiplier of more producers.
Current evaluation board is only applicable to single-path testing, and this project develops multichannel integrated test system, and multichannel is adjustable, cooperation
Host computer, which is realized to automatically control, completes voltage scanning.
All connections of invention software and hardware pass through network implementations, avoid driving incompatible problem；It is based on
LabVIEW completes all program development, wherein being embedded into LabVIEW execution based on the analysis of Python data；Program will be analyzed
As a result after quality control data library being written, it is automatically performed the statistical analysis of correlation measurements, realizes follow-up of quality and later period inspection
Rope.
Detailed description of the invention
Fig. 1 is silicon photomultiplier drive module cellular construction block diagram；
Fig. 2 is multi-channel control software data process figure；
Fig. 3 is SIPM multi-photon spectrum；
Fig. 4 is the test of drive module output voltage stability；
Fig. 5 is that drive module voltage-temperature corrects test chart；
Fig. 6 is computer and multiple SiPM power supply connection figures (RS-422)；Wherein, A, B are receiving ends, and Z, Y are transmitting terminals；
Fig. 7 is that single channel and multichannel module multi-photon compose test result figure；
(a) single channel drive module multi-photon is composed, and (b) multichannel drive module multi-photon is composed；
Fig. 8 is multichannel module energy resolution ratio stability test result figure.
Specific embodiment
The present invention is explained in further detail with reference to the accompanying drawing.
Silicon photomultiplier drive module design principle overall structure block diagram is as shown in Figure 1.Using high-precision and high-stability
DC/DC conversion chip (step-up DC/DC controller), tracking output voltage variation, using closed-loop control, reaches design objective.
Using advanced microcontroller as central processing unit, it can work in frequency wider range from 40 megahertzs to 60 megahertz
Hereby；It uses single supply low-voltage for its operating voltage, realizes low-power consumption；Three 32 bit CPU timers and 16 input channels, 12
The ability that position D/A converter makes the microprocessor that multichannel fast signal acquisition may be implemented；Communication is logical using the serial ports of isolation
Believe chip, there are one SCI (uart) module by micro controller data it is convenient and reliable send upper PC machine, SCI (UART) to
Module is located in microcontroller, there is 4 grades of FIFO；SiPM power supply be it is program-controlled, between upper PC machine and SiPM power supply use RS-
The connection of 422 serial communication bus, realizes the communication of one master and multiple slaves formula, dry outside computer and communication line bring in order to reduce
It disturbs, therefore SiPM power supply and computer is subjected to electrical isolation.Under normal conditions, bias supply used in silicon photomultiplier
Voltage range is 20V~90V direct current；Since the amplitude of silicon photomultiplier output signal is very quick to provided bias voltage
Sense, therefore requires the stability of power supply to get well, while the ripple of supply voltage wants low peak-to-peak value, conventional linear voltage stabilization method without
Method meets so low ripple requirement to be realized 5V and arrives so the present invention uses the DC/DC booster circuit of industry peak power
12V booster converter, since the intrinsic characteristic of DC/DC power supply is exactly that ripple is big, the present invention is using a super-low noise
Sound DC/DC controller, the controller use Silent Switcher technology, have high efficiency, high switching frequency and low EMI
Can, the ripple of DC/DC conversion links and the size of subsequent filtering link component are greatly reduced, so that not increasing system
Meet the requirement that power supply output ripple is less than 1mV in the case where cost and volume, therefore this circuit provides higher output electric current,
Efficiency is up to 87% or more, while this circuit output ripple is relatively small.Due to using voltage multiplying rectifier filtered electrical small in size
Road keeps the circuit area smaller, to realize that multi-channel control provides guarantee.If the circuit works at higher frequencies, can be into one
Step reduces inductor volume, keeps integrated circuit volume smaller.
Electric power driving module, including a microcontroller, microcontroller (MCU) correct the defeated of power module according to environment temperature
Voltage V outOUT, according to voltage VOUTAnd the deviation of setting value generates an output control amount by control algolithm, then this number is controlled
Amount processed is converted into the feedback voltage input terminal that analog quantity (0~5V voltage) is applied to DC/DC controller by D/A converter, leads to
The duty ratio for crossing change PWM makes output voltage stabilization be subsequently transmitted to voltage multiplying rectifier filter circuit to required numerical value.
Wherein, SiPM voltage-temperature compensation calculation formula are as follows: VOUT=VSET+△T×TC；VOUTAfter power module amendment
Output voltage, VSETIt is the setting value of output voltage, Δ T is reference point temperature and the deviation for surveying environment temperature, TCIt is SiPM
The temperature correction coefficient of operating voltage.
Voltage multiplying rectifier filter circuit output end is connect through current detection module with SiPM；
The current information that current detection module will test is sent to the microcontroller；
Voltage detection module monitors the voltage of SiPM, and voltage signal is sent to the microcontroller；
Temperature detecting module is used to detect the temperature of SiPM local environment and sends it to the microcontroller；
The microcontroller and an E2The connection of PROM parameter memory module, E2PROM parameter memory module is for storing SiPM's
Set operating voltage, reference temperature, temperature-voltage correction factor etc.；Wherein setting operating voltage is SiPM under reference temperature
Benchmark job voltage, temperature-voltage correction factor is the correction value that provides of producer.When temperature detecting module detects SiPM's
When variation has occurred compared to reference temperature in environment temperature, operating voltage is carried out according to voltage correction formula given above in time
Amendment, to guarantee the gain constant of SiPM.
SiPM is connect with a preamplifier, which is used to carry out further signal to the output signal of SiPM
Amplification defaults 20 times of amplification factor.SMB signal output interface is output to by amplified signal.
Silicon photomultiplier drive module includes a SMB signal output interface, and ± a 5V includes the terminals of ground wire
Son and a RS-422 communication terminal, every piece of electric power driving module can carry out address setting by toggle switch.Upper
Application program can be used in PC machine by RS422 protocol, different connected electric power driving modules are distinguished by address,
And the temperature-voltage corrected parameter and recommended work voltage of precognition are inputted, so that tested SiPM is worked under maximum gain, it is quasi-
Really reflect the actual performance of tested component.Meanwhile during being tested, application program currently exports Real-time Feedback
Voltage, output electric current and environment temperature, so that user monitor and adjust in real time in time.
The present invention also provides a kind of silicon photomultiplier batch-testing device, multichannel silicon photomultiplier drive module it
Between carried out by RS-422 agreement in parallel, using Labview platform development multi-channel control software, realize to road drive modules up to a hundred
SiPM voltage, the setting of temperature-compensating and the monitoring of real-time voltage and environment temperature are carried out, to realize multi-channel control.It is soft
The data flowchart of part is as shown in Figure 2.This project will use LabVIEW develop entire software systems, entire test process be with
Voltage scanning mode, is automatically performed.When batch testing system starts, the initialization of test macro is carried out first, including to slow
Control program initialization and the inspection of each hardware effort state.The major function of slow control program is that long-range adjustment SiPM is being referred to
At a temperature of benchmark job voltage and diode light intensity (light intensity be light-source system light intensity, SiPM can be by light-source system
Faint optical signal is converted to electric signal, and is exported by electric power driving module to data-acquisition system and analyzed).Because different
SiPM benchmark job voltage and temperature compensation parameter it is different, it is micro- so need to set a reference voltage and temperature compensation parameter
Controller goes to calculate and adjust actual output voltage again by the real time temperature that temp probe tests out.Light source part by with
Too net connection and control carry out the driving pulse width and range value of respective channel by controlling the light source part in program slowly
Parameter setting, or be loaded directly into the light source configuration file comprising multichannel parameter editted in advance and carry out batch setting.Power supply unit
Divide and be made of multiple electric power driving modules, passes through RS-422 agreement cascade Mach-Zehnder interferometer.Each drive module can add when starting to work
The driving plate voltage and temperature value configuration file for preserving default are carried, one can be distributed according to the actual situation in the configuration file
Or multiple RS-422 serial ports, each electric power driving module will be distributed under these RS-422 serial ports.Also include in configuration file
The parameter information of each electric power driving module, including enabled state, output voltage values, compensation temperature value, whether enabled closed loop control
The range of tolerable variance of system and each value, these data will be disposably arranged into low-tension supply module, and pass through one keying of program
System.After power unit and light source part all configuration, SiPM to be measured starts to work, and generates signal and be transmitted to power supply drive
Read-out electronics on dynamic model block.The function of Data Acquisition Program is the data for obtaining read-out electronics and sending over, by answering
Working properly with the waveform real-time display interface confirmation SiPM to be measured, light source and power supply of program, test macro initialization is completed.
Main test phase is divided into two stages, and power drives software is according to the voltage range to be scanned with preset step in the first stage
Long stepping generates scan table, and every voltage scanning point stops certain time and takes for obtaining the waveform of Data Acquisition Program
Number, and it is transmitted to data processor, and generate corresponding histogram.Data processor is mainly based upon ROOT analytical framework
The construction functions such as histogram and fitting data are realized in exploitation.In order to facilitate use, need for the Python code of ROOT to be embedded into
LabVIEW, to quickly obtain analysis result.After the voltage scanning stage, data processor will set benchmark job electricity
Pressure and analysis result are saved correspondingly, and are stored in database.Database is mainly based upon LabVIEW exploitation, can
To realize management, display and the analysis of large-scale silicon photomultiplier test data, filtered out by database each tested
Component obtains the operating voltage value of optimum resolution, and automatically saves as configuration file export.In second stage, application program
Optimum voltage is written in each corresponding power drive module by address for the configuration file that first stage generates, data acquisition journey
Sequence is fetched by waveform to be obtained original waveform preservation and is further calculated by data processor.Finally, by it is each to
Optimum operating voltage, calculated result and the corresponding chart for surveying SiPM are stored into database.The code development and tune of this part
The larger workload of examination, especially Data Acquisition Program will be one how high count rate occasion loses data less as far as possible
Difficult point.Traditional Data Acquisition Program is single-threading program, is operated on mono- core of CPU, therefore be unable to give full play multi-core CPU
Performance, be possible to the phenomenon that will appear loss of data in high count rate occasion.By using the multithreading of Labview,
Reading data the step is assigned on multiple cores and is completed parallel, to realize parallel read data, system number is greatly improved
According to handling capacity, loss of data is reduced.
The spectrum test of SIPM multi-photon, test result such as Fig. 3 institute have been carried out using the silicon photomultiplier drive module of development
Show.Test result shows that the clear test of SIPM multi-photon spectrum may be implemented in the drive module, and it is commercial that resolution ratio has reached shore pine
Product Level meets requirement.
It is tested using stability of the insulating box to drive module output voltage, drive module works at -5 DEG C -40
DEG C environment in, close voltage-stabilizations debugging functions, actual output voltage and set voltage results it is as shown in Figure 4.Test knot
The fruit surface drive module output voltage has extraordinary temperature stability, in without the modified situation of voltage-temperature,
Its output is not influenced by environment temperature, is always kept in a fixed state value output.
The amplitude output signal of SIPM is affected by temperature larger, and in order to make SIPM performance temperature, drive module has carried out electricity
Pressure-temperature adjustmemt.In order to verify voltage-stabilization correction effect of drive module, voltage-stabilization debugging functions are opened, in difference
At a temperature of test drive module output voltage and compared with theoretical value, test results are shown in figure 5.Drive module is repaired
Output voltage after just is consistent with theoretical output voltage, and error precision is less than 10mV.
It on the basis of single-board testing, while cascading eight pieces of drive modules and having carried out performance test, every piece of drive module is used
The mode of star-like connection is independently-powered, carries out grade joint control using a RS-422-USB serial ports parallel connection access PC between drive module
System, to achieve the purpose that batch testing.
Computer and SiPM power supply use the bus connecting mode of one master and multiple slaves to form communication network, as shown in fig. 6, network
Each of SiPM power supply all be assigned a unique address (IP address of somewhat similar computer network).Computer is
Host is responsible for the communication of management network, and each SiPM power supply is slave, is responsible for the order of response host；Since RS-422 is one
Bus-organization is planted, can only at a time have equipment (host or slave) to be in transmission state on any one route,
Each communication process is initiated by host, can only have one could respond Host Command by the slave that host is specified.Firstly, host
A frame data are sent according to communication protocol, includes the address information of slave in the data frame, is in active state in bus
Slave can all receive this frame data that host is sent；Following each slave parses data packet, obtains address
Information simultaneously judges whether to be addressed, and if it is completes corresponding function according to order and sends a frame data (response bag) notice master
Otherwise machine abandons.
The spectrum test of SIPM multi-photon is carried out after multichannel wired in parallel, as a result as shown in fig. 7, after multichannel wired in parallel
Clearly SIPM multi-photon spectrum can be measured.
It after multichannel wired in parallel, keeps whole system to stablize constant, tests within continuous 5 days, obtain energy resolution and stablize
Property data, as shown in Figure 8.
In conclusion being not intended to limit the scope of the present invention the above is only preferable implementation method of the invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (9)
1. a kind of multichannel cascading power source drive module, which is characterized in that including multiple electric power driving modules, each power drives mould
Block includes a signal output interface, a connecting terminal and a communication terminal；Each electric power driving module pass through respectively communication terminal with
Upper PC machine is in parallel, for electric power driving module current output voltage described in Real-time Feedback, output electric current and environment temperature；Its
In, each electric power driving module includes microcontroller, power module, D/A converter, DC/DC controller, voltage multiplying rectifier filter
Wave circuit, current detection module, voltage detection module, temperature detecting module and E2PROM parameter memory module；
The microcontroller, for correcting the output voltage V of power module according to environment temperatureOUT, then according to voltage VOUTWith set
The deviation of definite value generates a digital control amount and sends it to D/A converter；
D/A converter, for by the digital control amount received be converted into analog quantity be applied to DC/DC controller feedback voltage it is defeated
Enter end；
DC/DC controller, the duty ratio for changing PWM according to the analog signals received make output voltage stabilization to setting number
Voltage multiplying rectifier filter circuit is sent to after value；
The output end of voltage multiplying rectifier filter circuit is connect through current detection module with SiPM；
Current detection module, the current information for will test are sent to the microcontroller；
Voltage detection module is sent to the microcontroller for monitoring the voltage of SiPM, and by voltage signal；
Temperature detecting module, for detecting the temperature of SiPM local environment and sending it to the microcontroller；
E2PROM parameter memory module is connect with the microcontroller, for storing the setting benchmark job voltage of SiPM, with reference to temperature
Degree, temperature-voltage correction factor.
2. multichannel cascading power source drive module as described in claim 1, which is characterized in that output voltage VOUT=VSET+△T×
TC；Wherein, VSETIt is the setting benchmark job voltage of SiPM, Δ T is reference temperature and the deviation for surveying environment temperature, TCIt is SiPM
Temperature-voltage correction factor.
3. multichannel cascading power source drive module as described in claim 1, which is characterized in that being used as using single supply low-voltage should
The operating voltage of microcontroller.
4. multichannel cascading power source drive module as described in claim 1, which is characterized in that setting is several in the microcontroller
CPU timer a, wherein CPU timer is used for as data acquisition, the timing of control period.
5. multichannel cascading power source drive module as described in claim 1, which is characterized in that a SCI is arranged in the microcontroller
Module, for sending micro controller data to upper PC machine.
6. multichannel cascading power source drive module as claimed in claim 5, which is characterized in that the SCI module is gone here and there by RS-422
Row communication bus gives the data transmission of microcontroller to upper PC machine；It is main using one between upper PC machine and each electric power driving module
Mostly from bus connecting mode form communication network.
7. multichannel cascading power source drive module as described in claim 1, which is characterized in that the D/A converter is multi input
The analog-digital converter in channel, wherein being used to receive the microcontroller using an input channel is measurement temperature, it is logical using an input
Road is used to receive the load current of the microcontroller.
8. multichannel cascading power source drive module as described in claim 1, which is characterized in that the signal output interface is SMB
Signal output interface；The communication terminal is RS-422 communication terminal, and electricity is arranged by the toggle switch of RS-422 communication terminal
The address of source drive module；Upper PC machine and each electric power driving module pass through RS422 protocol.
9. a kind of silicon photomultiplier batch testing method based on multichannel cascading power source drive module described in claim 1,
It is characterized in that, one is arranged in the upper PC machine, and control program, power drives software, data processor and one apply journey slowly
Sequence；
1) initial phase: slow control program remotely adjusts benchmark job electricity of each electric power driving module under reference temperature
Pressure and diode light intensity；The driving plate voltage and configuration file of default are preserved in each electric power driving module load；Each SiPM
The optical signal of corresponding diode is received respectively, and the signal of generation is transmitted to the read-out electronics on electric power driving module, so
Waveform and real-time display are generated according to the data of read-out electronics output afterwards, confirms that SiPM, light source and power supply to be measured work just
Often；
2) it test phase: is swept first with power drives software according to the voltage range to be scanned with preset step-length stepping generation
Table is retouched, every voltage scanning point stops a setting time for application program and obtains waveform access, and is transmitted at data
Program is managed, and generates corresponding histogram；Benchmark job voltage and its corresponding histogram are stored in data by data processor
In library, each tested SiPM is filtered out from database and obtains the operating voltage value of optimum resolution and is saved in configuration file；
Then optimum voltage write-in corresponding power is driven mould according to the address of the configuration file and each electric power driving module by application program
In block.
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