CN102508035B - Fuel cell AC impedance on-line testing system and measuring and controlling method - Google Patents
Fuel cell AC impedance on-line testing system and measuring and controlling method Download PDFInfo
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- CN102508035B CN102508035B CN201110340568.4A CN201110340568A CN102508035B CN 102508035 B CN102508035 B CN 102508035B CN 201110340568 A CN201110340568 A CN 201110340568A CN 102508035 B CN102508035 B CN 102508035B
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Abstract
The invention relates to a fuel cell AC impedance on-line testing system and a measuring and controlling method thereof. The system comprises a program-controlled alternating current (AC) source, a blocking capacitor, a main controller, a CAN bus and a plurality of AC impedance testing units. Each AC impedance testing unit is used for detecting n chips of fuel cell AC impedances connected in series. The measuring and controlling method of the system has two working modes, which are a dynamic measuring and controlling mode and a static measuring and controlling mode. Under a dynamic measuring and controlling mode, when a fuel cell stack generates power, the main controller controlls the AC source and the AC impedance testing units through the CAN bus, measurement is carried out, measurement data is collected, such that AC impedance spectrums of all the single-chip fuel cells are obtained. Under the static measuring and controlling mode, when the fuel cell stack does not generate, the testing upon AC impedance of fuel cells with any number at a certain fixed frequency point is set manually. The system and the method provided by the invention are advantaged in simple circuit, high measurement precision, and high reliability. With the system and the method, real-time and high-precision testing requirements of fuel cell AC impedance can be satisfied.
Description
Technical field
The invention belongs to a kind of series-connection power supplies monomer AC impedance Online Transaction Processing and investigating method, particularly a kind of fuel cell AC impedance Online Transaction Processing and investigating method.
Background technology
Fuel cell is a kind ofly will to be stored in chemical energy in fuel and oxygenant and to convert to the device of electric energy by electrochemical reaction.According in practical application to fuel battery power requirement; conventionally fuel cell pack is composed in series to hundreds of sheet monocell by several; in fuel cell operation process; performance and the safety that extremely can affect whole pile of monolithic battery; therefore; efficiently move in order to ensure fuel cell, must monitor in real time each monolithic fuel cell.Undoubtedly, fuel cell AC impedance is the critical data of fuel cell power generation performance, necessary Real-Time Monitoring, and data are shown, storage, facilitates scientific research personnel to analyze and research.
The testing impedance equipment of current fuel cell comes with some shortcomings, as: equipment can only be measured under laboratory environment is established in experiment, cannot on air real time test; Can only test monolithic fuel cell impedance, cannot meet multi-disc fuel cell simultaneously and measure simultaneously; Can only test fuel cell at the resistance value of a certain Frequency point.And these equipment generally comprise the high-grade complex instrument such as fuel battery test platform, electronic load, frequency analyzer, need technician correctly to configure their hardware line, software program and interface communications protocol etc., this makes such test operation complexity, cost very high.
Summary of the invention
The object of the present invention is to provide a kind of simple, reliable fuel cell AC impedance Online Transaction Processing and investigating method, to overcome the deficiency of existing test macro.
To achieve these goals, the technical solution adopted in the present invention is:
A kind of fuel cell AC impedance Online Transaction Processing, this system comprises program control alternating current source, capacitance, master controller, CAN bus, multiple ac impedance measurement unit, it is characterized in that: the n sheet fuel cell AC impedance of described each ac impedance measurement unit inspection series connection, described ac impedance measurement unit comprises prime amplifier, I/V change-over circuit, two-way programmable filter, low-pass filter, phase difference detecting circuit, amplitude detection circuit and MCU microcontroller; Wherein in parallel with load and fuel cell pack output terminal after program control alternating current source serial connection capacitance, master controller is by the current excitation signal of the program control alternating current source output of the total line traffic control of CAN different frequency; Prime amplifier input end is connected with the each monocell in fuel cell pack and gathers each monolithic battery combined-voltage signal, I/V change-over circuit is connected with the output terminal of current sensor and gathers fuel cell ac and dc current signal, the AC signal that the signal gathering obtains after the filtering of two-way programmable filter, is connected with amplitude detection circuit with phase difference detecting circuit simultaneously; MCU microcontroller communicates by SPI interface and phase difference detecting circuit and amplitude detection circuit, obtains impedance magnitude and the phase data of fuel cell different frequency through computing; Master controller is connected with each ac impedance measurement unit by CAN bus, controls each ac impedance measurement unit and tests also collecting test data, finally obtains all monolithic fuel cell ac impedance spectroscopies.
In described ac impedance measurement unit, prime amplifier is made up of code translator, differential amplifier circuit and n two-way relay, described n sheet fuel cell B
0～B
n-1output voltage signal V respectively
0v
1～V
n-1v
n, fuel cell B
0output voltage signal V
0v
1with two-way relay L
1input end connects, fuel cell B
1output voltage signal V
1v
2with two-way relay L
2input end connects, fuel cell B by that analogy
n-1output voltage signal V
n-1v
nwith two-way relay L
nconnect; Code translator output signal is received respectively two-way Control end, and MCU microcontroller is by I/O mouth control code translator gating two-way relay L successively
1～L
n, each moment only has a relay in on-state, makes monolithic fuel cell output voltage signal V
n-1v
nbe strobed, and be connected with differential amplifier circuit input end.
Above-mentioned prime amplifier is by 16 two-way relays, and 4-16 code translator and differential amplifier circuit form.Fuel cell output voltage signal V
0v
1with two-way relay L
1input end connects, V
1v
2with two-way relay L
2input end connects, V by that analogy
15v
16with two-way relay L
16connect.4-16 code translator output signal is received respectively 16 Control ends.MCU microcontroller is by I/O mouth control 4-16 code translator relay gate L successively
1～L
16, each moment only has a relay in opening state, makes monolithic fuel cell output signal V
nv
n-1(n=1,2 ... 16) be strobed, and be connected with differential amplifier circuit input end.Differential amplifier circuit can be to input signal V
n, V
n-1(n=1,2 ... 16) carry out differential type amplification, enlargement factor is 100 times, makes prime amplifier can gather ac voltage signal faint on every fuel cell.
Above-mentioned two-way programmable filter is made up of 4 second-order bandpass filter A, B, C, D, and wherein second-order bandpass filter A and B, C and D can form respectively two quadravalence Butterworth bandpass filter.Second-order bandpass filter A, C input end are connected with I/V change-over circuit output signal Vi with prime amplifier output signal Vv respectively, and its output signal Vv ', Vi ' are connected with second-order bandpass filter B, D respectively.Second-order bandpass filter B output signal V (v) is connected with RMS to DC circuit 1 with zero passage comparator circuit 1 simultaneously, and second-order bandpass filter D output signal V (i) is connected with RMS to DC circuit 2 with zero passage comparator circuit 2 simultaneously.MCU microcontroller sends Fclk signal by PWM port and is connected with two-way programmable filter external clock input port.I/V change-over circuit output signal Vi is connected with low-pass filter input end simultaneously, A/D converter C in low-pass filter output signal Vi (R) and amplitude detection circuit
3port connects.
Above-mentioned phase difference detecting circuit is made up of zero passage comparator circuit 1,2 and FPGA, and wherein FPGA can be reduced to the combinational logic circuit of XOR gate, d type flip flop, register, counter module, SPI module and clock module composition.Zero passage comparator circuit 1,2 input ends are connected with AC signal V (v), V (i) respectively, 1 output signal Vv (p) while and XOR gate input end I of zero passage comparator circuit
2clk is connected with d type flip flop input end, 2 output signal Vi (p) whiles and XOR gate input end I of zero passage comparator circuit
1d is connected with d type flip flop input end.XOR gate output signal V (P) is connected with counter module input end, and clock module provides clock signal Fclk ' for counter module.D type flip flop output signal V (A) is connected with register input end.When test, AC signal V (v), V (i) change square-wave signal Vv (p) and Vi (p) into after zero passage comparator circuit, in the time that signal Vv (p) is not identical with Vi (p) level, the signal V (P) of XOR gate output is high level, and therefore in signal V (P) one-period, the time T of high level is just the time of input signal V (v), the phasic difference of V (i) phase.Start timing when V (P) starts counter module during for high level, V (P) becomes low level hour counter module and stops timing.Wherein when d type flip flop output signal V (A) for low level be explanation signal V (i) be ahead of V (v), signal V (A) for high level be illustrate signal V (i) lag behind V (v).After measurement finishes, counter module and register respectively counter value and signal V (A) level information by bus transfer to SPI module, then SPI module by SPI1 interface data transmission to MCU microcontroller.
Above-mentioned amplitude detection circuit is by RMS to DC circuit 1,2, and low-pass filter circuit 1,2 and A/D converter form.RMS to DC circuit 1,2 input ends are connected with signal V (v), Vv (i) respectively.The output signal Vv (M) of RMS to DC circuit 1,2 is connected with low-pass filter circuit 1,2 input ends respectively with Vi (M).A/D converter C
1, C
2and C
3port is connected with low-pass filter circuit 1,2 output signal Vv (M) ', Vi (M) ' and low-pass filter output signal Vi (R) respectively.When measurement, AC signal V (i), V (v) change into and the equal-sized direct current signal Vv of its effective value (M) ' and Vi (M) ' after RMS to DC circuit 1,2 and filtering.A/D converter is to signal Vv (M) ' and Vi (M) ' do after analog to digital conversion by SPI2 interface V (i), V (v) amplitude data transmission to MCU microcontroller, MCU microcontroller can obtain fuel cell AC impedance amplitude ratio by the ratio that calculates two-way amplitude data; A/D converter can obtain the DC current size of fuel cell pile output by the direct current signal Vi (R) of sampling low-pass filter output.
Above-mentioned MCU microcontroller is connected with phase difference detecting circuit, amplitude detection circuit respectively by SPI1, SPI2 interface, and by the frequency of the program control alternating current source output current signal of the total line traffic control of CAN.The MCU microcontroller of multiple ac impedance measurements unit is connected and can be formed CAN network by CAN bus, can measure any multi-disc fuel cell pack.
The present invention also provides a kind of investigating method of fuel cell AC impedance Online Transaction Processing, and this investigating method includes dynamic measuring control pattern and two kinds of mode of operations of static TT & C.Under dynamic measuring control pattern, system is in the time of fuel cell pile power generating, and master controller, by each ac impedance measurement unit of the total line traffic control of CAN, is tested and collecting test data, obtains all monolithic fuel cell ac impedance spectroscopies.When test, first initial frequency, cutoff frequency and the step frequency of test are set by master controller, then ac impedance measurement unit 1 detects fuel cell output current and sends to master controller by CAN bus, master controller starts output by the program control alternating current source of the total line traffic control of CAN after receiving data, output frequency is initial frequency, and current effective value is fuel cell output current 5%～10%.After program control alternating current source output, all ac impedance measurements unit starts test simultaneously, then master controller sends the call transmission instruction of the 1st ac impedance measurement unit, after call transmission instruction is received in the 1st ac impedance measurement unit, test the data obtained is issued to master controller, master controller sends the call transmission instruction of the 2nd ac impedance measurement unit again after receiving, go down successively, when master controller is received after the test data of N ac impedance measurement unit transmission, program control alternating current source output frequency increases automatically, increase the step frequency of size for arranging, follow all ac impedance measurements unit and start again to start test, so circulation whole test in the time that test frequency is cutoff frequency just finishes.Under static TT & C, system, in the time that fuel cell pack does not generate electricity, manually detects the fuel cell of any sheet number in the AC impedance of a certain fixed frequency point.Before test, any sheet that test is counted to any one relay L in fuel battery negative pole and anode and any one ac impedance measurement unit a
bbe connected, make L
bthe fuel cell of any sheet number of testing when gating is online.When test, first by master controller, test frequency, test channel, program control alternating current source output current are set, master controller is sent data is set by CAN bus broadcast, follows program control alternating current source output, and output frequency and size of current are constant is setting value.Then master controller starts by the test channel arranging the ac impedance measurement unit a being connected with institute test fuel cell, and a ac impedance measurement unit passes through relay gate L
bmake tested fuel cell online, then master controller sends the call transmission instruction of ac impedance measurement unit a, ac impedance measurement unit a issues master controller by test the data obtained after receiving call transmission instruction, and after master controller is received data, test finishes.
Simple circuit of the present invention, clear, reliability is high, and cost is moderate, and measuring accuracy is high, speed is fast, and rich interface and easily expansion, can meet the needs that fuel cell AC impedance real-time high-precision is tested.
Brief description of the drawings
Fig. 1 is structural principle block diagram of the present invention.
Fig. 2 is test macro control program process flow diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
The present invention forms (Fig. 1) by program control alternating current source, capacitance, master controller, CAN bus and multiple ac impedance measurements unit; 16 fuel cell AC impedance of each ac impedance measurement unit inspection, can test the fuel cell monolithic AC impedance that total sheet number is 16*N.Each ac impedance measurement unit comprises prime amplifier, I/V change-over circuit, two-way programmable filter, low-pass filter, phase difference detecting circuit, amplitude detection circuit and MCU microcontroller, wherein in parallel with fuel cell pack output terminal after program control alternating current source serial connection capacitance, master controller is by the current signal of the program control alternating current source output of the total line traffic control of CAN different frequency; Prime amplifier input end is connected with the each monocell in fuel cell pack and gathers battery combined-voltage signal, I/V change-over circuit is connected with the output terminal of current sensor and gathers battery ac and dc current signal, and the AC signal that the signal gathering obtains after the filtering of two-way programmable filter is connected with amplitude detection circuit with phase difference detecting circuit simultaneously; MCU microcontroller communicates by SPI interface and phase difference detecting circuit and amplitude detection circuit, can obtain impedance magnitude and the phase data of fuel cell different frequency through computing; Master controller is connected with each ac impedance measurement unit by CAN bus, controls each ac impedance measurement unit and tests, and realizes whole monolithic fuel cell 1kHz～100kHz ac impedance measurements, and finally obtains fuel cell ac impedance spectroscopy.
Fuel cell output signal V in prime amplifier of the present invention
0, V
1with two-way relay L
1input end connects, V
1, V
2with two-way relay L
2input end connects, V by that analogy
15, V
16with two-way relay L
16connect, decoder output 16 tunnel level signals are received respectively 16 Control ends.MCU microcontroller is by 4 road I/O mouth output 0000 to 1111 level signal control 4-16 code translator 74HC154 relay gate L successively
1-L
16, each moment only has a relay in opening state, makes monolithic fuel cell output signal V
n, V
n-1(n=1,2 ... 16) be strobed, and be connected with differential amplifier circuit input end.The differential amplifier circuit being made up of differential amplifier INA106 and tight amplifier AD826 is to input signal V
n, V
n-1(n=1,2 ... 16) carry out differential type amplification, wherein AC signal enlargement factor is 100 times, and can detect minimum ac voltage is 0.1mv (RMS), and highest frequency is 100kHz, and wherein two-way Control forward voltage is 5V.
Two-way programmable filter of the present invention is made up of the LTC1264 of Linear Tech chip and peripheral circuit, wherein peripheral circuit is designed by FilterCAD filter-design software, for ensureing filter effect, it is 0.1% precision resistance that the resistance of peripheral circuit is all selected precision.In the time that two-way programmable filter is worked, MCU microcontroller provides a clock signal Fclk by PWM port for LTC1264, its frequency is 20 times of filter center frequency, and the highest filter center frequency of wave filter reaches as high as 250kHz, and maximum filtering amplitude can reach Power supply voltage ± 5v.After filtering, output signal V (v), V (i) noise are less, facilitate the detection of late-class circuit, have improved measuring accuracy.
That in phase difference detecting circuit of the present invention, FPGA selects is the EP2C5T144C8N of ALTERA company, and clock used is 50M.Zero passage comparator circuit is made up of the LM3116 of TI company.When test, suppose that counter module counter value is T, program control alternating current source output current signal frequency while being f, MCU microcontroller is by can be calculated fuel cell AC impedance phase data:
Δ phase=360*T*f/Fclk ', wherein Fclk ' is the frequency of FPGA crystal oscillator.
In the time that test frequency is 100kHz to the maximum, FPGA measures phase accuracy and is
100kHz/50M*360=0.72 degree.
In the time that test frequency minimum is 1kHz, FPGA measures phase accuracy and is
1kHz/50M*360=0.0072 degree.
In amplitude detection circuit of the present invention, RMS to DC circuit 1,2 is made up of the AD637 of ADI company and peripheral circuit, and it can be converted to AC signal and the equal-sized d. c. voltage signal of its effective value.Vary in size according to input signal, AD637 input signal bandwidth can reach 8M, and wherein, when input signal effective value is 200mV, frequency input signal reaches as high as 600kHz.Low-pass filter circuit is the second-order low-pass filter of accurate amplifier AD826 and peripheral circuit composition, and its design is 1kHz by frequency.A/D converter is made up of 16 8 passage ADC chip TLC3548 of TI company and peripheral circuit, TCL3548 by SPI1 interface gathered AC signal V (v), V (i) amplitude data VMG1, VMG2 is transferred to MCU microcontroller, and MCU microcontroller can obtain fuel cell AC impedance amplitude than data by calculating the ratio of two-way amplitude data:
|Z|＝VMG1/VMG2。
MCU microcontroller of the present invention is connected and is connected with amplitude detection circuit with phase difference detecting circuit respectively by SPI1, SPI2 interface, multiple ac impedance measurements unit MCU microcontroller is connected and can be formed CAN network by CAN bus, can measure any multi-disc fuel cell pack.After detection finishes, MCU microcontroller finally can obtain fuel cell AC impedance through calculating:
Z＝|VMG1/VMG2|cos(Δphase)+j|VMG1/VMG2|sin(Δphase)。
The AC impedance that can measure fuel cell different frequency in test by changing program control alternating current source output frequency, finally can obtain monolithic fuel cell ac impedance spectroscopy.That wherein MCU microcontroller is selected is the PIC18F458 of MICROCHIP company.
The present invention has dynamic measuring control pattern and two kinds of mode of operations of static TT & C, as shown in Figure 2.While piling up generating for full test observation fuel cell, the AC impedance of all monolithic fuel cells can selective system be operated in dynamic measuring control pattern.Under dynamic measuring control pattern, system is in the time of fuel cell pile power generating, and master controller, by each ac impedance measurement unit of the total line traffic control of CAN, is tested and collecting test data, obtains all monolithic fuel cell ac impedance spectroscopies.When test, first initial frequency, cutoff frequency and the step frequency of test are set by master controller, then ac impedance measurement unit 1 detects fuel cell output current and sends to master controller by CAN bus, master controller starts output by the program control alternating current source of the total line traffic control of CAN after receiving data, output frequency is initial frequency, current effective value is 5%～10% of fuel cell output current, and acquiescence maximum output current is 5A.After program control alternating current source output, wait for 50ms, when all ac impedance measurements unit after program control alternating current source stable output signal starts test simultaneously, the test duration of system wait is 10ms, then master controller sends the call transmission instruction of the 1st ac impedance measurement unit, after call transmission instruction is received in the 1st ac impedance measurement unit, test the data obtained is issued to master controller, master controller receives that rear time delay 5ms sends the call transmission instruction of the 2nd ac impedance measurement unit again, go down successively, when master controller is received after the test data of N ac impedance measurement unit transmission, program control alternating current source output frequency increases automatically, increase the step frequency of size for arranging, all ac impedance measurements unit starts again to start test, so circulation whole test in the time that test frequency is cutoff frequency just finishes.Observe the AC impedance that fuel cell piles up while not generating electricity and can selective system be operated in static TT & C for rough.Under static TT & C, system, in the time that fuel cell pack does not generate electricity, manually detects the fuel cell of any sheet number in the AC impedance of a certain fixed frequency point.Below to test whole fuel cell pack AC impedance as example explanation fuel cell AC impedance Online Transaction Processing Static Detection mode of operation.When test, first whole fuel cell stack cathode V
0with anode V
16Nbe connected with any one relay Lb in any one ac impedance measurement unit a, then by master controller, test frequency, test channel, program control alternating current source output current be set, wherein test channel must be chosen as 16 (a-1)+b.Then master controller sends the data that arrange by CAN bus broadcast, follows program control alternating current source output, and output frequency and size of current are constant is setting value.Time delay 50ms, waits for that master controller after program control alternating current source stable output starts the ac impedance measurement unit a being connected with institute test fuel cell according to the test channel arranging, and a ac impedance measurement unit passes through relay gate L
bmake tested fuel cell online, then time delay 10ms, ac impedance measurement unit a completes the call transmission instruction of the rear master controller transmission of test ac impedance measurement unit a, ac impedance measurement unit a issues master controller by test the data obtained after receiving call transmission instruction, and after master controller is received data, test finishes.
Finally should illustrate, enforcement of the present invention is only unrestricted for technical scheme is described.All do not depart from amendment and the replacement of technical solution of the present invention spirit and scope, and it all should be encompassed in the middle of claim scope of the present invention.
The content not being described in detail in this instructions belongs to the known prior art of professional and technical personnel in the field.
Claims (5)
1. the investigating method of a fuel cell AC impedance Online Transaction Processing, described system comprises program control alternating current source, capacitance, master controller, CAN bus, multiple ac impedance measurements unit, the n sheet fuel cell AC impedance of described each ac impedance measurement unit inspection series connection, described ac impedance measurement unit comprises prime amplifier, I/V change-over circuit, two-way programmable filter, low-pass filter, phase difference detecting circuit, amplitude detection circuit and MCU microcontroller; Wherein in parallel with load and fuel cell pack output terminal after program control alternating current source serial connection capacitance, master controller is by the current excitation signal of the program control alternating current source output of the total line traffic control of CAN different frequency; Prime amplifier input end is connected with the each monocell in fuel cell pack and gathers each monolithic battery combined-voltage signal, I/V change-over circuit is connected with the output terminal of current sensor and gathers fuel cell ac and dc current signal, the AC signal that the signal gathering obtains after the filtering of two-way programmable filter, is connected with amplitude detection circuit with phase difference detecting circuit simultaneously; MCU microcontroller communicates by SPI interface and phase difference detecting circuit and amplitude detection circuit, obtains impedance magnitude and the phase data of fuel cell different frequency through computing; Master controller is connected with each ac impedance measurement unit by CAN bus, controls each ac impedance measurement unit and tests also collecting test data, finally obtains all monolithic fuel cell ac impedance spectroscopies; In described ac impedance measurement unit, prime amplifier is made up of code translator, differential amplifier circuit and n two-way relay, described n sheet fuel cell B
0～B
n-1output voltage signal V respectively
0v
1～V
n-1v
n, fuel cell B
0output voltage signal V
0v
1with two-way relay L
1input end connects, fuel cell B
1output voltage signal V
1v
2with two-way relay L
2input end connects, fuel cell B by that analogy
n-1output voltage signal V
n-1v
nwith two-way relay L
nconnect; Code translator output signal is received respectively two-way Control end, and MCU microcontroller is by I/O mouth control code translator gating two-way relay L successively
1～L
n, each moment only has a relay in on-state, makes monolithic fuel cell output voltage signal V
n -1v
nbe strobed, and be connected with differential amplifier circuit input end; Described two-way programmable filter is made up of 4 second-order bandpass filter A, B, C, D, and wherein second-order bandpass filter A and B, C and D form respectively two quadravalence Butterworth bandpass filter; Second-order bandpass filter A, C input end are connected with I/V change-over circuit output signal Vi with prime amplifier output signal Vv respectively, and its output signal Vv ', Vi ' are connected with second-order bandpass filter B, D respectively; Second-order bandpass filter B output signal V (v) is connected with RMS to DC circuit 1 with zero passage comparator circuit 1 simultaneously, and second-order bandpass filter D output signal V (i) is connected with RMS to DC circuit 2 with zero passage comparator circuit 2 simultaneously; MCU microcontroller sends Fclk signal by PWM port and is connected with two-way programmable filter external clock input port; I/V change-over circuit output signal Vi is connected with low-pass filter input end simultaneously, A/D converter C in low-pass filter output signal Vi (R) and amplitude detection circuit
3port connects, and described A/D converter is the AD637 of ADI company,
It is characterized in that: the investigating method of described system has dynamic measuring control pattern and two kinds of mode of operations of static TT & C:
Under dynamic measuring control pattern, master controller, by the program control alternating current source of the total line traffic control of CAN and each ac impedance measurement unit, is tested and collecting test data, obtains all monolithic fuel cell ac impedance spectroscopies, when test, first initial frequency, cutoff frequency and the step frequency of test are set by master controller, follow the 1st ac impedance measurement unit inspection fuel cell pack output current and send to master controller by CAN bus, master controller starts output by the program control alternating current source of the total line traffic control of CAN after receiving data, output frequency is initial frequency, and current effective value is 5%～10% of fuel cell pack output current, after program control alternating current source stable output, all ac impedance measurements unit starts test simultaneously, then master controller sends the call transmission instruction of the 1st ac impedance measurement unit, after call transmission instruction is received in the 1st ac impedance measurement unit, test the data obtained is issued to master controller, master controller sends the call transmission instruction of the 2nd ac impedance measurement unit again after receiving, go down successively, when master controller is received after the test data of N ac impedance measurement unit transmission, program control alternating current source output frequency increases automatically, increase the step frequency of size for arranging, follow all ac impedance measurements unit and start again to start test, so circulation whole test in the time that test frequency is cutoff frequency just finishes,
Under static TT & C, system, in the time that fuel cell pack does not generate electricity, manually arranges the fuel cell that detects any sheet number in the AC impedance of a certain fixed frequency point; Before test, any sheet that test is counted to any one relay L in fuel battery negative pole and anode and any one ac impedance measurement unit
nbe connected, make L
nthe fuel cell of any sheet number of testing when gating is online; When test, first by master controller, test frequency, test channel, program control alternating current source output current are set, master controller is sent data is set by CAN bus broadcast, follow program control alternating current source output, output frequency and size of current are constant is setting value, then master controller starts by the test channel arranging the ac impedance measurement unit being connected with institute test fuel cell, and N ac impedance measurement unit passes through relay gate L
nmake tested fuel cell online, then master controller sends the call transmission instruction of ac impedance measurement unit, and master controller is issued by test the data obtained after receiving call transmission instruction in ac impedance measurement unit, and after master controller is received data, test finishes.
2. the investigating method of fuel cell AC impedance Online Transaction Processing as claimed in claim 1, it is characterized in that: described prime amplifier is by 16 two-way relays, 4-16 code translator and differential amplifier circuit composition, described fuel cell is 16, described 16 fuel cell B
0～B
15output voltage signal V respectively
0v
1～V
15v
16, fuel cell B
0output voltage signal V
0v
1with two-way relay L
1input end connects, fuel cell B
1output voltage signal V
1v
2with two-way relay L
2input end connects, by that analogy, and fuel cell B
15output voltage signal V
15v
16with two-way relay L
16connect; Described 4-16 code translator output signal is received respectively 16 two-way Control ends; Described MCU microcontroller is by I/O mouth control 4-16 code translator gating two-way relay L successively
1～L
16, each moment only has a relay in on-state, makes monolithic fuel cell output voltage signal V
n-1v
nbe strobed, wherein n=1,2 ... 16, and be connected with differential amplifier circuit input end.
3. the investigating method of fuel cell AC impedance Online Transaction Processing as claimed in claim 1, it is characterized in that: described phase difference detecting circuit is made up of zero passage comparator circuit 1, zero passage comparator circuit 2 and FPGA, wherein FPGA is the combinational logic circuit of XOR gate, d type flip flop, register, counter module, SPI module and clock module composition; Zero passage comparator circuit 1, zero passage comparator circuit 2 input ends are connected with AC signal V (v), V (i) respectively, 1 output signal Vv (p) while and XOR gate input end I of zero passage comparator circuit
2clk is connected with d type flip flop input end, 2 output signal Vi (p) whiles and XOR gate input end I of zero passage comparator circuit
1d is connected with d type flip flop input end; XOR gate output signal V (P) is connected with counter module input end, and clock module provides clock signal Fclk ' for counter module; D type flip flop output signal V (A) is connected with register input end, and register sum counter module is connected with SPI module by bus.
4. the investigating method of fuel cell AC impedance Online Transaction Processing as claimed in claim 1, it is characterized in that: described amplitude detection circuit is by RMS to DC circuit 1, RMS to DC circuit 2, low-pass filter circuit 1, low-pass filter circuit 2 and A/D converter composition, RMS to DC circuit 1, RMS to DC circuit 2 input ends respectively with signal V (v), V (i) is connected, RMS to DC circuit 1, the output signal Vv (M) of RMS to DC circuit 2 and Vi (M) respectively with low-pass filter circuit 1, low-pass filter circuit 2 input ends connect, A/D converter C
1, A/D converter C
2with A/D converter C
3port is connected with low-pass filter circuit 1, low-pass filter circuit 2 output signal Vv (M) ', Vi (M) ' and low-pass filter output signal Vi (R) respectively.
5. the investigating method of fuel cell AC impedance Online Transaction Processing as claimed in claim 1, it is characterized in that: described MCU microcontroller is connected with phase difference detecting circuit, amplitude detection circuit respectively by SPI1, SPI2 interface, and by the frequency of the program control alternating current source output current signal of the total line traffic control of CAN, the MCU microcontroller of multiple ac impedance measurements unit is connected to form CAN network by CAN bus, and any multi-disc fuel cell is measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110340568.4A CN102508035B (en) | 2011-11-01 | 2011-11-01 | Fuel cell AC impedance on-line testing system and measuring and controlling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110340568.4A CN102508035B (en) | 2011-11-01 | 2011-11-01 | Fuel cell AC impedance on-line testing system and measuring and controlling method |
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| Publication Number | Publication Date |
|---|---|
| CN102508035A CN102508035A (en) | 2012-06-20 |
| CN102508035B true CN102508035B (en) | 2014-11-12 |
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