CN103439667B - Battery test system based on PXI bussing technique and method - Google Patents
Battery test system based on PXI bussing technique and method Download PDFInfo
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- CN103439667B CN103439667B CN201310394954.0A CN201310394954A CN103439667B CN 103439667 B CN103439667 B CN 103439667B CN 201310394954 A CN201310394954 A CN 201310394954A CN 103439667 B CN103439667 B CN 103439667B
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Abstract
The invention discloses a kind of battery test system based on PXI bussing technique and method of testing；Including: PXI bus module, power module, relay matrix module, constant-current source module, high-pressure modular, signal acquisition module, signal conditioning circuit, power amplification circuit and input-output equipment；Beneficial effects of the present invention: can realize the battery performance of large scale quantities is tested, utilize new industry to control detecting system PXI bussing technique and set up the detection platform of core, achieve activation loop resistance, insulation resistance and the test of dry state voltage, this battery test system stable and reliable operation, meet the testing requirement of battery, there is the features such as generalization, modularity, extensibility are strong, multi-model number can be tested simultaneously, improve measuring accuracy and efficiency, it is achieved test equipment automatization.
Description
Technical field
The present invention relates to a kind of battery test system and method, particularly relate to a kind of battery test system based on PXI bussing technique
And method.
Background technology
Safety and reliability is required as follows by existing battery test system:
1. battery test system test process ensureing, tested battery is not activated, it is impossible to make tested battery short circuit.
2. battery self sparking to be prevented, in order to avoid damaging test product and operator.
3. self-inspection to be carried out before cell tester detection, monitoring test product and self important state information during detection, one
Denier occur abnormal can be at shortest time internal cutting off faulty circuit power supply and report to the police.
The battery test system of present has the drawback that
The most existing battery test system does not possesses " a key test " automatic function, it is impossible to complete to judge voluntarily, pre-read voluntarily with defeated
Go out function；And, existing cell tester does not the most possess versatility, it is impossible to meet the test request of different model product.
The most existing battery test system does not use modularized design, it is impossible to carries out Module Division according to its function logic, makes mould
Mechanically and electrically interface between block is simplified, and realizes modularity subpackage, to facilitate test and to safeguard.
The structural circuit design of the most existing battery test system and method design cycle can not realize standardization, to facilitate technology to prop up
Hold and upgrade.
Summary of the invention
In order to solve problem above, the invention provides a kind of have the features such as generalization, modularity, extensibility are strong based on
The battery test system of PXI bussing technique and method.
To achieve these goals, the present invention adopts the following technical scheme that
A kind of battery test system based on PXI bussing technique, including: PXI bus module, power module, relay matrix
Module, constant-current source module, high-pressure modular, signal acquisition module, signal conditioning circuit, power amplification circuit and input and output set
Standby.
Described PXI bus module controls described relay matrix module through described power amplification circuit；Described high-pressure modular and described
Constant-current source module produces pumping signal, and described pumping signal is applied on tested battery through described relay matrix module；Described
Signal acquisition module gathers tested battery signal, and described signal conditioning circuit is delivered to after processing described tested battery signal
Described PXI bus module；Described power module provides the power supply needed for described modules and circuit；Described input-output equipment
It is connected with described PXI bus module.
Described PXI bus module includes CPU board, A D data acquisition board and numeral I O plate；Described CPU board is surveyed as battery
The control unit of test system；Described A D data acquisition board each for tested battery analogue signal is carried out A/D conversion；Described numeral I/O
Plate receives CPU board instruction and is controlled relay matrix module, and the multiple signals of each test event are switched to data acquisition board
Respective A/D passway.
Described relay matrix module comprises some relays, and described relay model is: SIL05-1A85 76D3K.
The model of described constant-current source module is LB8723A, and described constant-current source module can also use the constant-current source circuit of designed, designed.
The constant-current source circuit of described designed, designed includes: operational amplifier U1, Zener diode D1, relay K 1-K2, three poles
Pipe Q1-Q2, resistance R1-R6, resistance Rs, resistance Rx and fuse X1.
The base stage of described audion Q1 is connected with No. 6 pins of described operational amplifier U1 after connecting with resistance R1, described three poles
The emitter stage of pipe Q1 is connected with the base stage of described audion Q2, the colelctor electrode of described audion Q1 and the collection of described audion Q2
Electrode connect, the emitter stage of described audion Q2 connect with resistance R3-R4, electric capacity C1 after with the 3 of described operational amplifier U1
Number pin connects, and No. 2 pins of described operational amplifier U1 are connected with the emitter stage of described audion Q2, described operation amplifier
No. 4 pins of device U1 connect-15V power supply, No. 7 pins connect+15V power supply, other pins are unsettled；One end of described fuse X1
Be connected with the colelctor electrode of described audion Q1, the other end connect with resistance Rx, Rs after ground connection, described relay K 2 and described electricity
Resistance Rx is in parallel；Described Zener diode D1 is in parallel with described electric capacity C1, one end of described Zener diode D1 and described relay
Ground connection after device K1 series connection is followed by+15V power supply, the other end is connected with resistance R2 and resistance R6.
In described constant-current source module, the electric current flowing through resistance Rx is:
Choose the audion that amplification coefficient is sufficiently large, thenThen, the output electric current of described constant-current source module is:Wherein Vz is the voltage flowing through resistance R3, R4 two ends, β1And β2It is respectively audion Q1 and audion Q2
Amplification coefficient.
Described signal conditioning circuit includes: signal filter circuit, signal amplification circuit and signal isolation circuit.
Described signal filter circuit includes the first order low-pass filtering RC circuit being composed in series by resistance R7 and electric capacity C6, by resistance
R8, resistance R9, electric capacity C4 and resistance R10, the double T in the second level of electric capacity C2, electric capacity C3 composition hinder filter circuit.
Described signal amplification circuit includes: operational amplifier U2-U5, resistance R11, resistance R13, resistance R16-R18, resistance
R19-R23；No. 2 pins of described operational amplifier U5 are connected through No. 2 pins of resistance R19 and described operational amplifier U2,
No. 6 pins of described operational amplifier U5 are connected through No. 2 pins of resistance R22 and described operational amplifier U3, described computing
No. 6 pins of amplifier U2 are connected through No. 3 pins of resistance R23 and described operational amplifier U3, described operational amplifier U3
No. 3 pins ground connection after resistance R11, resistance R21 be serially connected in No. 2 pins of described operational amplifier U5 and No. 6 pins it
Between, resistance R20 is serially connected between No. 2 pins of described operational amplifier U2 and No. 6 pins, and resistance R13 is serially connected in described fortune
Calculate amplifier U3 No. 2 pins and No. 6 pins between, No. 6 pins of described operational amplifier U3 through resistance R16 with described
No. 2 pins of operational amplifier U4 connect, No. 3 pins ground connection after resistance R17 of described operational amplifier U4, resistance R18
Being serially connected between No. 2 pins of described operational amplifier U4 and No. 6 pins, No. 7 pins of described operational amplifier U2-U5 connect
It is unsettled that 15V power supply, No. 4 pins connect-15V power supply, other pin.
Described signal isolation circuit includes: isolation operational amplifier A D210, resistance R24-R25, resistance RP1；Described resistance R24
Be connected with No. 18 pins of described isolation operational amplifier A D210 with series arm one end of resistance R25, the other end and described electricity
Resistance RP1 connects, and described resistance RP1 is serially connected between No. 14 pins of described isolation operational amplifier A D210 and No. 15 pins.
In described signal filter circuit, the transmission function of first order low-pass filtering RC circuit is:
In the double T resistance filter circuit of the described second level:
The transmission function of the described second level double T resistance filter circuit is:
The transmission function of described signal filter circuit is:
Owing to the major function of filtering is to eliminate the Hz noise of 50Hz, therefore cut-off frequency ωnFor:
Described input-output equipment includes but not limited to: the Peripheral Interface of display, keyboard and cpu motherboard.
The method of testing of a kind of battery test system based on PXI bussing technique, comprises the following steps:
(1) start battery test system, the parameter of each hardware module in battery test system is carried out self-inspection.
The method of described self-inspection is: outfan to the power supply of each hardware module in the power module of battery test system
Switching relay is set, when self-inspection, controls described relay by software LabVIEW and power supply output voltage is switched to
The self-checking circuit that software carries, self-checking circuit is delivered in PXI bus module after the output voltage of power supply is carried out voltage division processing
A the A/D input of D data acquisition board, by the magnitude of voltage collected is carried out automatic anticipation, reach the purpose of self-inspection；From
After inspection, LabVIEW controls described relay and switches to common duty.
(2) if the parameter of each hardware module meets test request, then the insulating resistance value to battery, activation loop resistance are started
Value and dry state magnitude of voltage are tested；The method of described test can be software automatic test, it is also possible to artificial selection's test event
Carry out sectionalization test.
(3) if the parameter of hardware module is unsatisfactory for test request, then manual intervention is waited, after artificial treatment completes, if needed
Continue test, then forward step (1) to, otherwise terminate test.
(4) if insulating resistance value, activation loop resistance and dry state magnitude of voltage for battery test defect of data, then wait
Manual intervention, after artificial treatment completes, if needing to continue test, then forwards step (1) to, otherwise terminates test.
Beneficial effects of the present invention:
The battery test system of the present invention and method can realize testing the battery performance of large scale quantities, utilize emerging work
Industry controls detecting system PXI bussing technique and sets up the detection platform of core, it is achieved that to activation loop resistance, insulation resistance and dry
The test of state voltage, this battery test system stable and reliable operation, meet the testing requirement of battery, have generalization, modularity,
The features such as extensibility is strong, can test multi-model number simultaneously, improve measuring accuracy and efficiency, it is achieved test equipment
Automatization.
Accompanying drawing explanation
Fig. 1 is the battery test system structural representation of the present invention；
Fig. 2 is the power module schematic diagram of the present invention；
Fig. 3 is the circuit diagram of the relay drive circuit of the present invention；
Fig. 4 (a) is the circuit diagram of the constant-current source circuit of the designed, designed of the present invention；
Fig. 4 (b) is the constant-current source circuit simulation result of the designed, designed of the present invention；
Fig. 4 (c) is the existing constant-current source module fundamental diagram of the present invention；
Fig. 5 is the circuit diagram of the signal filter circuit of the present invention；
Fig. 6 is the circuit diagram of the signal amplification circuit of the present invention；
Fig. 7 is the circuit diagram of the signal isolation circuit of the present invention；
Fig. 8 is the battery test system program flow diagram of the present invention；
Fig. 9 is the battery insulation resistance value test philosophy of the present invention；
Figure 10 is the battery activated loop resistance value test philosophy of the present invention；
Figure 11 is the battery dry state voltage tester principle of the present invention.
Wherein, 1.CPU plate, 2.PXI bus, 3. power amplification circuit, the most tested battery, 5. numeral I/O plate, 6. continues
Relay matrix module, 7. high-pressure modular, 8. power module, 9. constant-current source module, 10. digital collection plate, 11 signal condition electricity
Road, 12. signal acquisition module, 13.LCD display, 14.USB interface, 15.RS232/422 interface, 16. keyboards.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As it is shown in figure 1, a kind of battery test system based on PXI bussing technique, including: PXI bus module, power module 8,
Relay matrix module 6, constant-current source module 9, high-pressure modular 7, signal acquisition module 12, signal conditioning circuit 11, power
Amplifying circuit 3 and input-output equipment.
The digital signal that the digital I/O plate 5 that CPU board controls to be articulated in PXI bus exports is after power amplification circuit 3 amplifies
Control the relay in relay matrix module 6, Insulation test voltage and constant-current source and generate pumping signal, therewith pumping signal warp
It is applied on tested battery 4 by relay matrix module 6.Various physical quantitys on tested battery 4 under pumping signal effect with
The form of voltage signal is collected, then returns again to signal conditioning circuit 11, and relay matrix module 6 is tested to each road simultaneously
Signal switches over, to meet the test request of multiple signals.Signal conditioning circuit 11 voltage signal is carried out amplitude limit, filtering,
Sending into data acquisition board after amplification, data acquisition board 10 carries out A/D conversion to voltage signal, by the digital signal transmission after conversion
Read to bus for CPU board 1.CPU board 1 carries out finishing analysis and reduction to the data read, finally by the battery after reduction
Physical quantity, such as activation loop resistance, insulating resistance value, dry state voltage etc., display in the man machine interface of application program for
Family is read.
As in figure 2 it is shown, power module 8 uses 220V 50Hz Alternating Current Power Supply.Cabinet inside forms an AC/DC constant voltage DC
Power supply, is converted to alternating current 24V and exports DC source, and be further converted to by this DC source required for modules is straight
Stream power supply.
Each power module function declaration is as follows:
(1) PXI bus 2 module uses 24V DC source.
(2) 24V DC voltage is amplified to the 500V DC voltage test voltage as insulation resistance by high-pressure modular 7.
(3) relay power amplification circuit 3 uses 5V DC source to be amplified by the digital signal of numeral I/O plate 5, to drive
Relay.
(4) ± 15V DC source is used for powering to constant-current source circuit 9 and signal conditioning circuit 11, signal conditioning circuit 11
To measured signal filter and amplification etc. is acted on, interim integrated operational amplifier need this ± 15V DC voltage.
PXI bus module is the main control unit of cell tester.PXI bus module includes CPU board 1, digital collection plate 10 and
Numeral I/O plate 5.It is fast that framework based on PXI bus has speed, data throughout is big, low in energy consumption, install easy to connect can
The feature leaned on, installs WindowsXP system in CPU module.
CPU board 1 selects the PXI-8101 of NI company, and its major parameter is as follows:
Processor: Inter Celeron 575 2.0GHz；Internal memory: 1GB DRR2；Hard disk: 80G；I/O:1 RS232,2
Individual USB；Operation temperature: 0～50 DEG C；Storage temperature :-40～65 DEG C；Support a road RS232,1 road RS422/485,2
Road USB interface；Prepackage WindowsXP system, NI-VISA and NI-488.2 driver and the driving of built-in I/O port
Program.
Data acquisition board 10 effect is that each for tested battery analogue signal is carried out A/D conversion, and data acquisition board 10 selects NI company
PXI-6220, major parameter is as follows:
16 road A/D passages are single-ended or 8 road A/D passage difference analogues input；16bitA/D transducer, the highest sample frequency is
700KHz；Maximum programmable input voltage range ± 10V；Collecting temperature-20～55 DEG C.Capture card is 16 bit resolutions, tested
Voltage signal is 0～5V, then data collecting card voltage resolution is 5/216=0.076mV, test result indicate that, this resolution is full
Each project testing precision of foot.
Numeral I/O plate 5 receives CPU board 1 and instructs and be controlled relay matrix module 6, the multichannel of each test event is believed
Number switch to data acquisition board 10 respective A/D passway.PXI-6513 numeral I/O of NI company selected by numeral I/O plate 5
Plate 5 major parameter is as follows:
The drain electrode output of light-coupled isolation type 64 tunnel；Maximum working voltage ± 24V；Output current single channel 500mA, multichannel 125mA；
Operating temperature 0～55 DEG C, storage temperature-20～70 DEG C.
As it is shown on figure 3, the relay in the drive circuit of relay matrix module 6 selects the Germany small-sized PCB of MEDER company to continue
Electricity SIL05-1A85 76D3K.According to PXI-6513 output circuit principle, which employs light-coupled isolation output and Darlington transistor drives
Dynamic, when the single channels operation of each port, maximum exportable 500mA, each when 8 passages of each port work simultaneously
Passage maximum is output as 125mA, and therefore PXI-6513 can directly drive relay.
Relay coil is connected between COM end and the outfan of PXI-6513, acquiescence when PXI-6513 initial power-on or reset
Output logic high, interior lights electric coupler does not works, and common port COM and outfan PX.Y-is off.In journey
Sequence control under, when Digital Logic output low level isolate photoelectrical coupler work, Darlington transistor drive under common port COM and
Outfan PX.Y-connects, thus external relay obtains electric work.
Require and overall plan according to design, need to provide precision constant current source during test activation loop resistance.Can use voluntarily at present
The constant-current source circuit 9 built with integrated operational amplifier and discrete device of design, it is possible to use and apply existing constant-current source module
LB8723A。
As shown in Fig. 4 (a), the constant-current source circuit 9 of designed, designed includes: operational amplifier U1, Zener diode D1, continue
Electrical equipment K1-K2, audion Q1-Q2, resistance R1-R6, resistance Rs, resistance Rx and fuse X1；The base stage of audion Q1
It is connected with No. 6 pins of operational amplifier U1 after connecting with resistance R1, the emitter stage of audion Q1 and the base stage of audion Q2
Connecting, the colelctor electrode of audion Q1 is connected with the colelctor electrode of audion Q2, the emitter stage of audion Q2 and resistance R3-R4, electricity
Being connected with No. 3 pins of operational amplifier U1 after holding C1 series connection, No. 2 pins of operational amplifier U1 are sent out with audion Q2's
Emitter-base bandgap grading connects, and No. 4 pins of operational amplifier U1 connect-15V power supply, No. 7 pins connect+15V power supply, other pins are unsettled；
Ground connection after one end of fuse X1 is connected with the colelctor electrode of described audion Q1, the other end is connected with resistance Rx, Rs, relay
K2 is in parallel with described resistance Rx；Zener diode D1 is in parallel with described electric capacity C1, continues with described in one end of Zener diode D1
Ground connection after electrical equipment K1 series connection is followed by+15V power supply, the other end is connected with resistance R2 and resistance R6.
When operational amplifier U10 is operated in amplification region, its input near short circuit, then negative input end voltage is equal to positive input terminal electricity
Pressure.Owing to Zener diode is operated in breakdown region, voltage stabilizing value is 2.4V, then V-=V+=15-Vz, therefore resistance R3, R4 two ends
Voltage is 15-(15-Vz)=Vz.Therefore, the electric current flowing through measured resistance Rx is:Wherein β1、
β2Being two audion amplification coefficients, Vz is the voltage flowing through resistance R3, R4 two ends, chooses three poles that amplification coefficient is bigger
Pipe, thenThen, the output electric current of described constant-current source module is:
Ideally, the equivalent internal resistance of constant-current source is infinitely great, and output electric current does not changes with the change of load, but actual
The parameter of amplifier is the most non-ideal, such as open-loop gain and the limited situation of input impedance.
In Fig. 4 (a), constant-current source power supply is connected on the normally-closed contact of relay K 1, importantly occurs when constant-current source circuit
During fault, flow through when the electric current on load resistance (the most battery activated loop resistance) increases and disconnect constant current in time by control circuit
Source current.Realize process as follows: in test process, control program in real time Rs both end voltage is acquired by data acquisition board
And calculate current value, when current value excessive time control processing procedure sequence disconnects the normally-closed contact of relay K 1, constant current by control circuit
Source circuit dead electricity, reaches circuit overcurrent protection effect.
Relay K 2 is for constant-current source circuit self-inspection.Before detection, load resistance Rx does not accesses circuit, and tester can be by control
Circuit processed makes relay K 2 open the closing of contact, by constant-current source circuit turn on, by test Rs on voltage and calculate electric current
Value is the most working properly to judge current circuit.
Use circuit simulating software Multisum that circuit shown in Fig. 4 (a) is emulated, shown in simulation result such as Fig. 4 (b).
Shown in existing constant-current source module LB8723A operation principle such as Fig. 4 (c), design parameter is as follows: running voltage: 15 ± 0.3V；
Operating temperature :-45～85 DEG C；
Constant-current source module output current is determined by the size of voltage reference unit and sampling resistor, and formula is as follows:
Wherein V0On the basis of voltage, RdFor sampling resistor value.
Two kinds of Constant Current-Source Design methods all can meet activation loop resistance test functional requirement.
Signal conditioning circuit 11 includes: signal filter circuit, signal amplification circuit and signal isolation circuit.
As it is shown in figure 5, signal filter circuit includes the first order low-pass filtering RC circuit being composed in series by resistance R7 and electric capacity C6,
The double T in the second level being made up of resistance R8, resistance R9, electric capacity C4 and resistance R10, electric capacity C2, electric capacity C3 hinders filter circuit；
The effect of signal filter circuit is to eliminate the main interference in circuit, i.e. 50Hz Hz noise, for the design of analog filter,
Resistance, electric capacity and amplifier overlap joint is generally used to form.This filter circuit uses two stage filter, and one-level is RC low-pass filtering, two grades
For double-T shaped bandreject filtering.
In signal filter circuit, the transmission function of first order low-pass filtering RC circuit is:
In the double T resistance filter circuit of the second level:
The transmission function of the second level double T resistance filter circuit is:
The transmission function of signal filter circuit is:
Owing to the major function of filtering is to eliminate the Hz noise of 50Hz, therefore cut-off frequency ωnFor:
Choosing suitable components and parts makes its cut-off frequency close with the 314.15rad/s of requirement, meets filtering requirements.
As shown in Figure 6, signal amplification circuit includes: operational amplifier U2-U5, resistance R11, resistance R13, resistance R16-R18,
Resistance R19-R23；No. 2 pins of operational amplifier U5 are connected through No. 2 pins of resistance R19 and operational amplifier U2, fortune
No. 6 pins calculating amplifier U5 are connected through No. 2 pins of resistance R22 and operational amplifier U3, No. 6 of operational amplifier U2
Pin is connected through No. 3 pins of resistance R23 and operational amplifier U3, and No. 3 pins of operational amplifier U3 are after resistance R11
Ground connection, resistance R21 is serially connected between No. 2 pins of operational amplifier U5 and No. 6 pins, and resistance R20 is serially connected in operation amplifier
Between No. 2 pins and No. 6 pins of device U2, resistance R13 be serially connected in No. 2 pins of operational amplifier U3 and No. 6 pins it
Between, No. 6 pins of operational amplifier U3 are connected through No. 2 pins of resistance R16 and operational amplifier U4, operational amplifier U4
No. 3 pins ground connection after resistance R17, resistance R18 is serially connected between No. 2 pins of operational amplifier U4 and No. 6 pins,
No. 7 pins of operational amplifier U2-U5 connect 15V power supply, No. 4 pins connect-15V power supply, other pin is unsettled.
In signal amplification circuit, operational amplifier U2, U3, U5 form differential amplifier circuit.Differential amplifier circuit is put by computing
Big device U5, operational amplifier U2 form first order differential type circuit, operational amplifier U3 composition second level differential type circuit, electricity
Resistance R19, resistance R20, resistance R21 form feedback network, owing to introducing degree of depth series voltage negtive backword, therefore have higher
Input impedance.Operational amplifier U5 and operational amplifier U2 selects in-phase end as voltage input end, then its common mode exports
Voltage and temperature drift voltage are the most equal.Common-mode voltage and temperature drift voltage can be supported in the differential type computing through operational amplifier U3
Disappearing, therefore amplifying circuit has the strongest common mode inhibition capacity and less output temperature drift voltage.Operational amplifier U4 is that voltage is anti-
To follower, its effect is to make front stage isolate.Based on upper figure circuit parameter, amplification A of whole amplifying circuit can be as follows
It is calculated:
As it is shown in fig. 7, in order to measured signal is isolated with computer system, make computer system safer, and filter
Except certain interference signal, reduce the output resistance of amplifying circuit simultaneously, need data acquisition board A/D Channel front end increase every
From circuit.Select isolated amplifier AD210 (operating temperature range: 0 DEG C to+70 DEG C) that circuit is isolated.
Signal isolation circuit includes: isolation operational amplifier A D210, resistance R24-R25, resistance RP1；Resistance R24 and resistance
Series arm one end of R25 is connected with No. 18 pins of isolation operational amplifier A D210, the other end is connected with resistance RP1, electricity
Resistance RP1 is serially connected between No. 14 pins and No. 15 pins of isolation operational amplifier A D210.
Isolation operational amplifier A D210 and non-essential resistance is used to constitute a high-precision 1:1 signal isolation circuit.Wherein
RP1 potentiometer, R24 and R25 resistance composition amplifier zero adjustment circuit, adjusts circuit without this and then has a 6mV left side
The right error of zero.100K Ω potentiometer uses multi-turn high accuracy potentiometer, and 50K Ω and 200 Ω resistance use tolerance to be 0.1%
Low Drift Temperature resistance.
Input-output equipment mainly includes LCD display 13, keyboard 16, and the Peripheral Interface of cpu motherboard 1, as USB connects
Mouth 14, RS232/422 interface 15 etc..Keyboard 16 selects compact touch keyboard, it is desirable to waterproof and dustproof, anti-severe use
Environment, high service life.USB interface data wire within tester with reversal connection, can protect the confidentiality of output data.
Fig. 8 show the battery test system program flow diagram of the present invention, and operating system uses WindowsXP, and programming platform selects
With Windows/CVI, programming language selects C language.
Program circuit it is crucial that process to abnormal conditions, abnormal conditions include self-built defective and test defect of data, when
After abnormal conditions occur, software can not process voluntarily, needs to wait manual intervention, down performs according to the intention of operator, nothing
When abnormal conditions occur, software can run voluntarily to software and terminate.
Software possesses self-checking function, needs to carry out self-inspection before test every time, such as the inspection to TCH test channel, to constant-current source size,
Each AC/DC power module self-inspections etc., then prohibit the use of equipment as being unsatisfactory for test request and point out manual intervention inspection.
The method of self-inspection is the outfan of each power module (power module above said in hardware) in hardware circuit design
Switching relay is set, when self-inspection, controls relay by software LabVIEW and power module output voltage is switched to self-inspection
Circuit (software carries, and is used for detecting the numerical value whether above voltage of voltage module output reach required by us), self-inspection electricity
Power module (above in hardware circuit, voltage module is divided into four parts, each part will be carried out voltage division processing) voltage is entered by road
The A/D input of data acquisition board is delivered to, by gathering voltage module (magnitude of voltage of each voltage module) after row voltage division processing
Magnitude of voltage anticipation automatically, thus reach the purpose of self-inspection, after self-inspection, LabVIEW controls relay and switches to unskilled labor
Make state.
Fig. 9 show insulating resistance value test philosophy in battery, in figure, designs 12 road Insulation test passages, each measured point altogether
A relay in contact relay matrix A and a relay on relay matrix B respectively, by controlling opening of relay
Close and can realize any two points testing insulation between plates.Such as need to measure 1 o'clock insulating resistance value to 3 o'clock, relay matrix module 6
Closing relay K21 and relay K 35 under the control of numeral I/O plate 5, then by data acquisition board 10 to sampling resistor
The measurement of the magnitude of voltage on Rs1 can calculate 1 o'clock insulating resistance value to 3 o'clock.In figure, R26 is current-limiting resistance, when tested electricity
When resistance is short-circuited, circuit can be played a protective role by R26.
It is low resistance measuring resistance by R26 and Rs1 in figure, following relation can be tried to achieve by schematic diagram:
In formula, RxFor insulation resistance to be measured, U is 500V test voltage, VINFor the sampling resistor R recordeds1The sampling electricity at two ends
Pressure.Utilize signal conditioning circuit after this voltage is filtered isolation, to enter data acquisition board to test, thus can calculate absolutely
Edge resistance value Rx。
Figure 10 show activation loop resistance test philosophy in battery, and activation loop resistance measurement belongs to microresistivity survey, if adopting
With two traditional line measurements, then can cable resistance interference and the interference of relay contacts resistance be brought in test result, meeting thus
The precision of test result is caused and has a strong impact on.Use four-wire method to measure and then can avoid cable guide resistance and relay contacts resistance
Impact.
Figure 11 show dry state voltage tester principle in battery, the technical specification of dry state voltage tester:
Dry state voltage tester scope: 0～20V；Dry state voltage tester precision: 0.01V；Dry state voltage Eligibility requirements: only test number
According to, data are not done interpretation.
In view of the particularity of dry state voltage characteristic, for preventing dry state voltage from discharging from test loop, dry state voltage tester end must have
There is big input impedance, otherwise can cause test crash.In the unit testing of the battery used by early stage product, test dry state electricity
Pressure have employed digital multimeter, and reference number circuit tester DC voltage principle is measured, and uses the divider resistance of suitable size to dry state
Voltage can be tested after range of receiving to data acquisition board 10.This system selects the divider resistance of suitable size by tested electricity
Pressure makees voltage division processing, uses divider resistance that (0～2V) after tested dry state voltage (0～20V) dividing potential drop is sent into amplifier and amplifies,
Voltage signal after amplification be admitted to data acquisition board 10 carry out A/D conversion can calculate dry state voltage.
Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines, but not restriction to invention protection domain,
One of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art need not pay wound
The property the made various amendments that can make of work or deformation are still within protection scope of the present invention.
Claims (6)
1. a battery test system based on PXI bussing technique, is characterized in that, including: PXI bus module, power module,
Relay matrix module, constant-current source module, high-pressure modular, signal acquisition module, signal conditioning circuit, power amplification circuit and
Input-output equipment；
Described PXI bus module controls described relay matrix module through described power amplification circuit；Described high-pressure modular and described
Constant-current source module produces pumping signal, and described pumping signal is applied on tested battery through described relay matrix module；Described
Signal acquisition module gathers tested battery signal, and described signal conditioning circuit is delivered to after processing described tested battery signal
Described PXI bus module；Described power module provides the power supply needed for modules and circuit；Described input-output equipment and institute
State PXI bus module to connect；
Described signal conditioning circuit includes: signal filter circuit, signal amplification circuit and signal isolation circuit；
Signal filter circuit includes the first order low-pass filtering RC circuit being composed in series by resistance R7 and electric capacity C6, by resistance
R8, resistance R9, electric capacity C4 and resistance R10, the double T in the second level of electric capacity C2, electric capacity C3 composition hinder filter circuit, tool
Body includes: the series arm of electric capacity C2 and electric capacity C3 is connected in parallel with the series arm of resistance R8 and resistance R9, electric capacity C4's
One end is accessed between resistance R8 and resistance R9, another termination signal negative pole；Electric capacity C2 and electric capacity are accessed in one end of resistance R10
Between C3, another termination signal negative pole；
In described signal filter circuit, the transmission function of first order low-pass filtering RC circuit is:
In the double T resistance filter circuit of the described second level:
The transmission function of the described second level double T resistance filter circuit is:
The transmission function of described signal filter circuit is:
Owing to the major function of filtering is to eliminate the Hz noise of 50Hz, therefore cut-off frequency ωnFor:
A kind of battery test system based on PXI bussing technique, is characterized in that, described PXI is total
Wire module includes CPU board, A/D data acquisition board and numeral I/O plate；Described CPU board is as the control list of battery test system
Unit；Each for tested battery analogue signal is carried out A/D conversion by described A/D data acquisition board；Described numeral I/O plate receives CPU board
Relay matrix module is controlled by instruction, the multiple signals of each test event switches to the respective A/D of data acquisition board and leads to
Road junction.
A kind of battery test system based on PXI bussing technique, is characterized in that, described relay
Matrix module comprises some relays, and described relay model is: SIL05-1A85 76D3K.
A kind of battery test system based on PXI bussing technique, is characterized in that, described constant-current source
Module includes: operational amplifier U1, Zener diode D1, relay K 1-K2, audion Q1-Q2, resistance R1-R6, electricity
Resistance Rs, resistance Rx and fuse X1；The base stage of audion Q1 connect with resistance R1 after with No. 6 pipes of operational amplifier U1
Foot connects, and the emitter stage of audion Q1 is connected with the base stage of audion Q2, and the colelctor electrode of audion Q1 is with audion Q2's
Colelctor electrode connects, the emitter stage of audion Q2 connect with resistance R3-R4, electric capacity C1 after with No. 3 pins of operational amplifier U1
Connecting, No. 2 pins of operational amplifier U1 are connected with the emitter stage of audion Q2, and No. 4 pins of operational amplifier U1 connect
It is unsettled that-15V power supply, No. 7 pins connect+15V power supply, other pins；One end of fuse X1 and the current collection of described audion Q1
Ground connection after pole connects, the other end is connected with resistance Rx, Rs, relay K 2 is in parallel with described resistance Rx；Zener diode D1
In parallel with described electric capacity C1, one end of Zener diode D1 connect with described relay K 1 be followed by+15V power supply, the other end with
Ground connection after resistance R2 and resistance R6 series connection；
The electric current flowing through resistance Rx is:
Choose the audion that amplification coefficient is sufficiently large, then
The output electric current of the constant-current source circuit of designed, designed is:Wherein Vz is to flow through resistance R3, R4 two ends
Voltage, β1And β2It is respectively audion Q1 and the amplification coefficient of audion Q2.
5. a method of testing for battery test system based on PXI bussing technique as claimed in claim 1, is characterized in that,
Comprise the following steps:
(1) start battery test system, the parameter of each hardware module in battery test system is carried out self-inspection；
(2) if the parameter of each hardware module meets test request, then the insulating resistance value to battery, activation loop resistance are started
Value and dry state magnitude of voltage are tested；The method of described test is software automatic test, or artificial selection's test event carries out segmentation
Test；
(3) if the parameter of hardware module is unsatisfactory for test request, then manual intervention is waited, after artificial treatment completes, if needed
Continue test, then forward step (1) to, otherwise terminate test；
(4) if insulating resistance value, activation loop resistance and dry state magnitude of voltage for battery test defect of data, then wait
Manual intervention, after artificial treatment completes, if needing to continue test, then forwards step (1) to, otherwise terminates test.
The method of testing of a kind of battery test system based on PXI bussing technique, is characterized in that,
In described step (1), the method for self-inspection is: power supply to each hardware module in the power module of battery test system
Outfan arranges switching relay, when self-inspection, controls described relay by power supply output voltage by software LabVIEW
Switching to the self-checking circuit that software carries, self-checking circuit delivers to PXI bus after the output voltage of power supply is carried out voltage division processing
The A/D input of A/D data acquisition board in module, by the magnitude of voltage collected is carried out automatic anticipation, reaches the mesh of self-inspection
's；After self-inspection, LabVIEW controls described relay and switches to common duty.
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