CN117269779A - Fuel cell stack monolithic voltage detection device and system - Google Patents
Fuel cell stack monolithic voltage detection device and system Download PDFInfo
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- CN117269779A CN117269779A CN202311564049.5A CN202311564049A CN117269779A CN 117269779 A CN117269779 A CN 117269779A CN 202311564049 A CN202311564049 A CN 202311564049A CN 117269779 A CN117269779 A CN 117269779A
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- 238000001514 detection method Methods 0.000 title claims abstract description 77
- 239000000446 fuel Substances 0.000 title claims abstract description 73
- 238000012545 processing Methods 0.000 claims abstract description 32
- 238000007689 inspection Methods 0.000 claims abstract description 27
- 238000002955 isolation Methods 0.000 claims description 71
- 238000004891 communication Methods 0.000 claims description 51
- 238000006243 chemical reaction Methods 0.000 claims description 37
- 238000005070 sampling Methods 0.000 claims description 36
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000003287 optical effect Effects 0.000 claims description 15
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000006855 networking Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 22
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/206—Switches for connection of measuring instruments or electric motors to measuring loads
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention provides a single-chip voltage detection device and a system of a fuel cell stack, wherein the device comprises a single-voltage inspection board and a signal acquisition board, the single-voltage inspection board comprises a first analog switch chip with the model of MPC507, a second analog switch chip with the model of MPC509 and a signal processing circuit; the input end of the first analog switch chip is connected with the voltage detection end of the fuel cell stack, the output end of the first analog switch chip is connected with the input end of the second analog switch chip, the output end of the second analog switch chip is connected with the signal processing circuit, and the signal processing circuit is respectively connected with the first analog switch chip and the signal acquisition board; the first analog switch chip adopted by the invention is provided with eight differential channels, the second analog switch chip is provided with four differential channels, and the high-precision voltage detection of 32 single batteries by one voltage inspection board can be realized by combining the two chips, so that the cost is lower in the voltage detection of the same number of single batteries.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell stack monolithic voltage detection device and system.
Background
The high-power fuel cell stack is generally formed by connecting hundreds to thousands of single cells in series, and because of the serial structure of single cells in the stack, in the operation process of the stack, the gas circuit of any single cell in the stack is blocked by liquid water, the cell reaction is slowed down or even stopped, the output voltage is reduced or even reversed, the occurrence of the fault is fatal to the fuel cell, therefore, the voltage of each single cell needs to be detected in real time, and is transmitted to a fuel cell controller, so that the controller can conveniently take effective measures according to the abnormal condition of voltage data, the safe and reliable operation of the fuel cell stack is ensured, and the data of each single cell can also be uploaded to an upper computer, so that the scientific researchers can analyze and study the working condition and the performance of the stack; in short, the single-chip voltage detection of the fuel cell stack plays a very important role in the development stage of the stack and after the stack is put into use.
At present, the method for detecting the voltage of the single battery of the fuel cell stack mainly comprises an optocoupler relay method and a chip-based LTC6804 method, but when the number of single batteries is too large, the number of optocouplers to be equipped is too large, the cost is high, and an optocoupler switch has a nonlinear characteristic, so that the voltage deviation cannot be accurately corrected, and the error of a measurement result is large, while the chip-based LTC6804 method has high measurement accuracy, but when the large-scale single batteries are detected, the number of chips to be equipped is too large, and the cost is high.
Disclosure of Invention
In view of this, it is necessary to provide a device and a system for detecting the voltage of a fuel cell stack monolithic, which are used for solving the technical problem that the voltage detection of the fuel cell stack monolithic in the prior art cannot simultaneously achieve cost and precision.
In one aspect, the invention provides a fuel cell stack monolithic voltage detection device, which comprises a single voltage inspection board and a signal acquisition board, wherein the single voltage inspection board comprises a first analog switch chip with the model number of MPC507, a second analog switch chip with the model number of MPC509 and a signal processing circuit;
the input end of the first analog switch chip is connected with the voltage detection end of the fuel cell stack, the output end of the first analog switch chip is connected with the input end of the second analog switch chip, the output end of the second analog switch chip is connected with the signal processing circuit, and the signal processing circuit is respectively connected with the first analog switch chip and the signal acquisition board;
and the signal processing circuit converts the voltage corresponding to the single-chip battery into a single-chip voltage value, and outputs the single-chip voltage value to the signal acquisition board after isolating and converting, so that the voltage detection of the single-chip battery is realized.
Optionally, the signal acquisition board comprises a digital signal processor, an AD sampling circuit and a communication circuit;
the input end of the AD sampling circuit is connected with the signal processing circuit, the output end of the AD sampling circuit is connected with the input end of the digital signal processor, the output end of the digital signal processor is respectively connected with the input end of the communication circuit and the signal processing circuit, and the output end of the communication circuit is connected to an external networking.
Optionally, the AD sampling circuit includes an AD chip with a model of AD7606BSTZ, and the model of the digital signal processor is DSP2812;
the communication pins of the AD chip are set to be parallel interface mode, the DSP2812 accesses the AD chip through an external memory interface bus, starts conversion and reads conversion result data.
Optionally, the communication circuit comprises a communication capacitor, a communication resistor and a communication chip with a model CTM8251 LAT;
one end of the communication capacitor is grounded, the other end of the communication capacitor is connected with a power pin of the communication chip, one end of the communication resistor is connected with a high-level output end of the communication chip, and the other end of the communication resistor is connected with a low-level output end of the communication chip.
Optionally, the signal processing circuit comprises a differential amplifying circuit, a signal isolation conversion circuit and a digital signal optical coupling isolation circuit; the differential amplifying circuit comprises a differential chip with the model INA148UA, a positive sampling resistor and a negative sampling resistor;
one end of the positive sampling resistor is connected with the positive output end of the second analog switch chip, the other end of the positive sampling resistor is connected with the positive input end of the differential chip, one end of the negative sampling resistor is connected with the negative output end of the second analog switch chip, the other end of the negative sampling resistor is connected with the negative input end of the differential chip, and the output end of the differential chip is connected with the input end of the signal isolation conversion circuit.
Optionally, the signal isolation conversion circuit comprises an isolation resistor, an isolation capacitor, an isolation conversion chip with the model ISO124U and an operational amplifier;
the input end of the isolation conversion chip is connected with the output end of the differential amplification circuit, the output end of the isolation conversion chip is connected with one end of the isolation resistor, one end of the isolation resistor is connected with one end of the isolation capacitor and the positive input end of the operational amplifier, the other end of the isolation capacitor is grounded, and the output end of the operational amplifier is connected with the negative input end of the operational amplifier and the input end of the signal acquisition board.
Optionally, the digital signal optical coupling isolation circuit includes a first voltage dividing resistor, a second voltage dividing resistor and an optical coupling chip of model IL205 AT;
one end of the first voltage dividing resistor is connected with an external power supply, the other end of the first voltage dividing resistor is connected with the positive input end of the optical coupler chip, the negative input end of the optical coupler chip is connected with the signal acquisition board, one end of the second voltage dividing resistor is connected with the external power supply, and the output end of the optical coupler chip is respectively connected with the other end of the second voltage dividing resistor, the chip selection end of the first analog switch chip and the chip selection end of the second analog switch chip.
Optionally, the single-voltage inspection board further includes an isolated power supply for converting the external power supply into an isolated voltage;
the isolation power supply is used for supplying power to the first analog switch chip, the second analog switch chip, the differential amplifying circuit and the signal isolation conversion circuit.
Optionally, the signal acquisition board may be connected to eight single-voltage inspection boards, and the second analog switch chip may be connected to four first analog switch chips.
On the other hand, the invention also provides a fuel cell stack single-chip voltage detection system, which comprises the fuel cell stack single-chip voltage detection device.
The beneficial effects of the invention are as follows: the invention provides a fuel cell stack monolithic voltage detection device, which comprises a single voltage inspection board and a signal acquisition board, wherein the single voltage inspection board comprises a first analog switch chip with the model of MPC507, a second analog switch chip with the model of MPC509 and a signal processing circuit; the input end of the first analog switch chip is connected with the voltage detection end of the fuel cell stack, the output end of the first analog switch chip is connected with the input end of the second analog switch chip, the output end of the second analog switch chip is connected with the signal processing circuit, and the signal processing circuit is respectively connected with the first analog switch chip and the signal acquisition board; the invention discloses a fuel cell stack voltage detection method, which comprises the steps of firstly selecting a second analog switch chip based on a chip selection signal sent by a signal acquisition board, then selecting a first analog switch chip, finally selecting a single-chip battery needing voltage detection from the fuel cell stack, converting the voltage corresponding to the single-chip battery into a single-chip voltage value through a signal processing circuit, isolating and converting the single-chip voltage value, and outputting the single-chip voltage value to the signal acquisition board to realize voltage detection of the single-chip battery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of a single-chip voltage detection device for a fuel cell stack according to the present invention;
FIG. 2 is a schematic circuit diagram of a first analog switch chip in a fuel cell stack monolithic voltage detection device according to the present invention;
FIG. 3 is a schematic circuit diagram of a second analog switch chip in the fuel cell stack monolithic voltage detection device provided by the invention;
FIG. 4 is a schematic diagram showing the connection between a single voltage inspection board and a signal acquisition board in a single voltage detection device for a fuel cell stack according to the present invention;
FIG. 5 is a schematic circuit diagram of an AD sampling circuit in a fuel cell stack monolithic voltage detection device provided by the invention;
FIG. 6 is a schematic circuit diagram of a communication circuit in a fuel cell stack monolithic voltage detection device provided by the present invention;
FIG. 7 is a schematic circuit diagram of a differential amplifier circuit in a fuel cell stack monolithic voltage detection device according to the present invention;
FIG. 8 is a schematic circuit diagram of a signal isolation conversion circuit in a fuel cell stack monolithic voltage detection device provided by the invention;
FIG. 9 is a schematic circuit diagram of a digital signal optocoupler isolation circuit in a fuel cell stack monolithic voltage detection device provided by the invention;
fig. 10 is a schematic circuit diagram of an isolated power supply in the fuel cell stack monolithic voltage detection device provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present invention. It should be appreciated that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The embodiment of the invention provides a fuel cell stack monolithic voltage detection device, which is respectively described below.
Fig. 1 is a schematic structural diagram of an embodiment of a single-chip voltage detection device for a fuel cell stack, as shown in fig. 1, where the single-chip voltage detection device for a fuel cell stack includes a single-voltage inspection board and a signal acquisition board, and the single-voltage inspection board includes a first analog switch chip with a model number of MPC507, a second analog switch chip with a model number of MPC509, and a signal processing circuit;
the input end of the first analog switch chip is connected with the voltage detection end of the fuel cell stack, the output end of the first analog switch chip is connected with the input end of the second analog switch chip, the output end of the second analog switch chip is connected with the signal processing circuit, and the signal processing circuit is respectively connected with the first analog switch chip and the signal acquisition board;
the chip selection signal based on the signal acquisition board firstly carries out chip selection on the second analog switch chip, then carries out chip selection on the first analog switch chip, finally selects a single battery needing voltage detection from the fuel cell stack, converts the voltage corresponding to the single battery into a single voltage value through the signal processing circuit, and outputs the single voltage value to the signal acquisition board after isolation conversion, so that the voltage detection of the single battery is realized.
It should be noted that, in the embodiment of the present invention, the group A1 and the group B1 in fig. 1 are two groups of interfaces where the first analog switch chip detects the negative voltage of the positive voltage of the single cell, the OUTB1 and the OUTA1 are detected positive voltage signals and negative voltage signals of the single cell, the second analog switch chip may be connected to 4 first analog switch chips, and so on, and the OUTB1-OUTB4, OUTA1-OUTA4, and OUT1 are signals of the single-chip voltage value pair calculated according to the positive voltage and the negative voltage of the currently detected single-chip cell.
It should be noted that in the embodiment of the invention, the single-voltage inspection board is composed of a first analog switch chip of a differential 8 channel, a second analog switch chip of a differential 4 channel, a differential amplifying circuit, a signal isolation conversion circuit and a digital signal optical coupling isolation circuit, the gating of the single-chip cells in the fuel cell stack is realized by combining the first analog switch chip and the second analog switch chip, when one single-chip cell is gated, other single-chip cells are not physically isolated outside the circuit, and after the chip selection signal is output from the signal acquisition board, the chip selection signal is continuously subjected to the effort isolation treatment by the digital signal optical coupling isolation circuit, so that the safety and the anti-interference performance of the chip selection signal are ensured; the chip selection combination of the two-stage analog switch chips reduces the number of the chip selection signals and ensures the reliability of chip selection.
It can be understood that referring to fig. 2 and fig. 3, fig. 2 is a schematic circuit diagram of a first analog switch chip in the fuel cell stack monolithic voltage detection device provided by the invention, and fig. 3 is a schematic circuit diagram of a second analog switch chip in the fuel cell stack monolithic voltage detection device provided by the invention, in the embodiment of the invention, the first analog switch chip with the model number of MPC507 and the second analog switch chip with the model number of MPC509 are adopted for gating, so that the cyclic detection of monolithic voltage can be realized, and the invention has the characteristics of fast switching speed and low hardware cost; referring to fig. 4, fig. 4 is a schematic diagram of connection between a single voltage inspection board and a signal acquisition board in the fuel cell stack monolithic voltage detection device provided by the invention, the single voltage inspection board and the signal acquisition board are separately arranged, and are connected through a data bus, so that the single voltage inspection board can be conveniently arranged on a stack accessory nearby, and the signal acquisition board can be arranged at a position far away from a stack, and the electromagnetic interference resistance and reliability of the device can be enhanced; and a signal acquisition board can insert a plurality of single voltage and patrol and examine the board, can realize the monolithic voltage measurement of high-power pile, and single voltage patrol and examine the board and to the first analog switch circuit that includes 48 passageway more, can effectively avoid the too high problem of common mode voltage.
In the implementation, because the positive electrode and the negative electrode of the adjacent single-chip batteries are connected together, only one voltage detection signal wire is needed to be led into the connection point of the adjacent single-chip batteries, the signal wire is separated before the single-chip batteries are connected into the first analog switch chip, the positive electrode and the negative electrode of the single-chip batteries are respectively connected into the first analog switch chip, and the cyclic detection is realized by sequentially selecting chip selection signals; a second analog switch chip with the model of MPC509 can be connected into four first analog switch chips, one first analog switch chip can be connected into the positive and negative poles of 8 single-chip batteries, so that a single-voltage inspection board can carry out voltage inspection on 32 single-chip batteries, a chip selection signal is output through a signal acquisition circuit, the chip selection signal is isolated through a digital signal optocoupler isolation circuit, then the voltage of a certain single-chip battery is selected by the first analog switch chip and the second analog switch chip, and the voltage is output to the signal acquisition board after signal conversion through a differential amplification circuit and a signal isolation conversion circuit.
Compared with the prior art, the single-chip voltage detection device for the fuel cell stack comprises a single-voltage inspection board and a signal acquisition board, wherein the single-voltage inspection board comprises a first analog switch chip with the model number of MPC507, a second analog switch chip with the model number of MPC509 and a signal processing circuit; the input end of the first analog switch chip is connected with the voltage detection end of the fuel cell stack, the output end of the first analog switch chip is connected with the input end of the second analog switch chip, the output end of the second analog switch chip is connected with the signal processing circuit, and the signal processing circuit is respectively connected with the first analog switch chip and the signal acquisition board; the invention discloses a fuel cell stack voltage detection method, which comprises the steps of firstly selecting a second analog switch chip based on a chip selection signal sent by a signal acquisition board, then selecting a first analog switch chip, finally selecting a single-chip battery needing voltage detection from the fuel cell stack, converting the voltage corresponding to the single-chip battery into a single-chip voltage value through a signal processing circuit, isolating and converting the single-chip voltage value, and outputting the single-chip voltage value to the signal acquisition board to realize voltage detection of the single-chip battery.
In some embodiments of the present invention, a signal acquisition board includes a digital signal processor, an AD sampling circuit, and a communication circuit;
the input end of the AD sampling circuit is connected with the signal processing circuit, the output end of the AD sampling circuit is connected with the input end of the digital signal processor, the output end of the digital signal processor is respectively connected with the input end of the communication circuit and the signal processing circuit, and the output end of the communication circuit is connected to the external networking.
Referring to fig. 5, fig. 5 is a schematic circuit diagram of an AD sampling circuit in the fuel cell stack monolithic voltage detection device according to the present invention; in some embodiments of the invention, the AD sampling circuit comprises an AD chip with the model of AD7606BSTZ, and the model of the digital signal processor is DSP2812;
the communication pins of the AD chip are set to be in a parallel interface mode, the DSP2812 accesses the AD chip through an external memory interface bus, and starts conversion and reads conversion result data.
It can be understood that in the embodiment of the invention, the digital signal processor is DSP2812, which has the characteristics of short measurement period and good measurement instantaneity, but because the AD sampling precision of the DSP2812 does not reach 12 bits, even though the AD sampling precision is linearly corrected, the AD chip with the model of AD7606BSTZ is adopted to carry out the outer expansion of the DSP2812, the chip AD7606BSTZ is an 8-channel bipolar 16-bit SAR (Successive Approximation Register, successive approximation) ADC (Analog-to-Digital Converter, digital-Analog converter), the sampling rate of each channel is up to 200kSPS, the measurement of positive and negative voltages can be realized, and the signal acquisition precision is high; and an AD chip with the model of AD7606BSTZ can be connected with 8 single-voltage inspection boards, so that the voltage detection of 256 single-chip batteries can be realized.
Referring to fig. 6, fig. 6 is a schematic circuit diagram of a communication circuit in a fuel cell stack monolithic voltage detection device according to the present invention; in some embodiments of the present invention, the communication circuit includes a communication capacitor C35, a communication resistor R17, and a communication chip of model CTM8251 LAT;
one end of the communication capacitor C35 is grounded, the other end of the communication capacitor C35 is connected to a power pin of the communication chip, one end of the communication resistor R17 is connected to a high-level output end of the communication chip, and the other end of the communication resistor R17 is connected to a low-level output end of the communication chip.
In the embodiment of the invention, a CTM8251LAT chip is adopted to realize CAN communication function, the chip realizes the isolation and the transmission of CAN communication, the isolation voltage is up to 2500VDC, the baud rate CAN be up to 1Mbps, and the maximum number of expandable nodes in the same CAN-BUS network is 110; different communication ID addresses are set for different fuel cell stack single-chip voltage detection devices, networking among a plurality of fuel cell stack single-chip voltage detection devices is realized through the communication circuit, the detection quantity of the single-chip voltage of the fuel cell stack is expanded, and the problem of single-chip voltage detection of the ultra-high power stack (hundreds to thousands of pieces) is solved.
Referring to fig. 7, fig. 7 is a schematic circuit diagram of a differential amplifying circuit in a fuel cell stack monolithic voltage detection device according to the present invention; in some embodiments of the present invention, the signal processing circuit includes a differential amplifying circuit, a signal isolation converting circuit and a digital signal optical coupling isolation circuit, where the differential amplifying circuit includes a differential chip of model INA148UA, a positive sampling resistor R210 and a negative sampling resistor R211;
one end of the positive sampling resistor R210 is connected with the positive output end of the second analog switch chip, the other end of the positive sampling resistor R210 is connected with the positive input end of the differential chip, one end of the negative sampling resistor R211 is connected with the negative output end of the second analog switch chip, the other end of the negative sampling resistor R211 is connected with the negative input end of the differential chip, and the output end of the differential chip is connected with the input end of the signal isolation conversion circuit.
It can be understood that in the embodiment of the invention, the differential chip selects INA148UA, the chip is a high-precision, low-power consumption and unit gain differential amplifier, the common-mode voltage of up to 200V can be tolerated, two ends of the monolithic voltage of the galvanic pile are connected to the input end of the chip, and the output end is the monolithic voltage value.
Referring to fig. 8, fig. 8 is a schematic circuit diagram of a signal isolation conversion circuit in a fuel cell stack monolithic voltage detection device according to the present invention; in some embodiments of the invention, the signal isolation conversion circuit comprises an isolation resistor R278, an isolation capacitor C181, an isolation conversion chip of the model ISO124U and an operational amplifier U72A;
the input end of the isolation conversion chip is connected with the output end of the differential amplification circuit, the output end of the isolation conversion chip is connected with one end of the isolation resistor R278, one end of the isolation resistor R278 is connected with one end of the isolation capacitor C181 and the positive input end of the operational amplifier U72A, the other end of the isolation capacitor C181 is grounded, and the output end of the operational amplifier U27A is connected with the negative input end of the operational amplifier U72A and the input end of the signal acquisition board.
It can be understood that in the embodiment of the invention, the isolation conversion chip adopts ISO124U, the chip is a high-precision low-power isolation amplifier, the isolation voltage is up to 1500V, the input and output power supplies are isolated, the nonlinearity is up to 0.01%, the chip has the characteristics of large isolation voltage and high common-mode voltage resistance, and the selected single voltage is isolated and converted by the isolation conversion chip, so that the problem of high accumulated potential of a galvanic pile is effectively solved.
Referring to fig. 9, fig. 9 is a schematic circuit diagram of a digital signal optocoupler isolation circuit in a fuel cell stack monolithic voltage detection device according to the present invention; in some embodiments of the present invention, the digital signal optocoupler isolation circuit includes an optocoupler chip of a first voltage dividing resistor R200, a second voltage dividing resistor R201, and a model IL205 AT;
one end of the first voltage dividing resistor R200 is connected with an external power supply, the other end of the first voltage dividing resistor R200 is connected with the positive input end of the optical coupler chip, the negative input end of the optical coupler chip is connected with the signal acquisition board, one end of the second voltage dividing resistor R201 is connected with the external power supply, and the output end of the optical coupler chip is respectively connected with the other end of the second voltage dividing resistor R201, the chip selection end of the first analog switch chip and the chip selection end of the second analog switch chip.
It can be understood that the optocoupler chip adopts IL205AT, the input/output isolation voltage is up to 4000V, the switching speed is 3us, and the chip selection signal input by the signal acquisition board is mainly isolated and protected, so that the chip selection signal is prevented from being interfered.
Referring to fig. 10, fig. 10 is a schematic circuit diagram of an isolated power supply in a fuel cell stack monolithic voltage detection device according to the present invention; in some embodiments of the invention, the single voltage patrol board further comprises an isolated power supply for converting an external power supply into an isolated voltage;
the isolation power supply is used for supplying power to the first analog switch chip, the second analog switch chip, the differential amplifying circuit and the signal isolation conversion circuit.
It can be understood that the isolation power supply is used for supplying power to the single-voltage inspection board, converting the voltage provided by the external power supply into isolation voltages of other levels so as to provide the inspection board with each circuit unit to work, in a specific implementation, the single-voltage inspection board is externally introduced with +5V, is subjected to power conversion by a power chip DCV010515DP-U, is converted into isolated +/-15V voltage, and is supplied to the first analog switch chip, the second analog switch chip, the differential amplifying circuit and the signal isolation conversion circuit for use, and the isolation voltage of the power chip is up to 1500V.
In some embodiments of the present invention, the signal acquisition board may be connected to eight single voltage patrol boards, and the second analog switch chip may be connected to four first analog switch chips.
It can be understood that in the embodiment of the invention, an 8-channel AD chip is adopted in the AD sampling circuit, eight single-voltage inspection boards can be connected, the second analog switch chip is 4-channel, and four first analog switch chips can be connected, so that a fuel cell stack single-chip voltage detection device can inspect 256 single cells.
On the other hand, the embodiment also provides a fuel cell stack monolithic voltage detection system, which includes the fuel cell stack monolithic voltage detection device, and the specific embodiment of the fuel cell stack monolithic voltage detection system refers to the embodiment of the fuel cell stack monolithic voltage detection device and is not described herein.
The above describes the fuel cell stack monolithic voltage detection device and system provided by the present invention in detail, and specific examples are applied herein to illustrate the principles and embodiments of the present invention, and the above examples are only used to help understand the method and core ideas of the present invention; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present invention, the present description should not be construed as limiting the present invention in summary.
Claims (10)
1. The single-chip voltage detection device of the fuel cell stack is characterized by comprising a single-voltage inspection board and a signal acquisition board, wherein the single-voltage inspection board comprises a first analog switch chip with the model number of MPC507, a second analog switch chip with the model number of MPC509 and a signal processing circuit;
the input end of the first analog switch chip is connected with the voltage detection end of the fuel cell stack, the output end of the first analog switch chip is connected with the input end of the second analog switch chip, the output end of the second analog switch chip is connected with the signal processing circuit, and the signal processing circuit is respectively connected with the first analog switch chip and the signal acquisition board;
and the signal processing circuit converts the voltage corresponding to the single-chip battery into a single-chip voltage value, and outputs the single-chip voltage value to the signal acquisition board after isolating and converting, so that the voltage detection of the single-chip battery is realized.
2. The fuel cell stack monolithic voltage detection device according to claim 1, wherein the signal acquisition board comprises a digital signal processor, an AD sampling circuit, and a communication circuit;
the input end of the AD sampling circuit is connected with the signal processing circuit, the output end of the AD sampling circuit is connected with the input end of the digital signal processor, the output end of the digital signal processor is respectively connected with the input end of the communication circuit and the signal processing circuit, and the output end of the communication circuit is connected to an external networking.
3. The fuel cell stack monolithic voltage detection device according to claim 2, wherein the AD sampling circuit comprises an AD chip of model AD7606BSTZ, and the digital signal processor is of model DSP2812;
the communication pins of the AD chip are set to be parallel interface mode, the DSP2812 accesses the AD chip through an external memory interface bus, starts conversion and reads conversion result data.
4. The fuel cell stack monolithic voltage detection device according to claim 3, wherein the communication circuit includes a communication chip of a communication capacitor, a communication resistor, and a model CTM8251 LAT;
one end of the communication capacitor is grounded, the other end of the communication capacitor is connected with a power pin of the communication chip, one end of the communication resistor is connected with a high-level output end of the communication chip, and the other end of the communication resistor is connected with a low-level output end of the communication chip.
5. The fuel cell stack monolithic voltage detection device according to claim 4, wherein the signal processing circuit comprises a differential amplification circuit, a signal isolation conversion circuit, and a digital signal optocoupler isolation circuit; the differential amplifying circuit comprises a differential chip with the model INA148UA, a positive sampling resistor and a negative sampling resistor;
one end of the positive sampling resistor is connected with the positive output end of the second analog switch chip, the other end of the positive sampling resistor is connected with the positive input end of the differential chip, one end of the negative sampling resistor is connected with the negative output end of the second analog switch chip, the other end of the negative sampling resistor is connected with the negative input end of the differential chip, and the output end of the differential chip is connected with the input end of the signal isolation conversion circuit.
6. The fuel cell stack monolithic voltage detection device according to claim 5, wherein the signal isolation conversion circuit comprises an isolation resistor, an isolation capacitor, an isolation conversion chip of model ISO124U, and an operational amplifier;
the input end of the isolation conversion chip is connected with the output end of the differential amplification circuit, the output end of the isolation conversion chip is connected with one end of the isolation resistor, one end of the isolation resistor is connected with one end of the isolation capacitor and the positive input end of the operational amplifier, the other end of the isolation capacitor is grounded, and the output end of the operational amplifier is connected with the negative input end of the operational amplifier and the input end of the signal acquisition board.
7. The fuel cell stack monolithic voltage detection device of claim 6, wherein the digital signal optocoupler isolation circuit comprises a first voltage divider resistor, a second voltage divider resistor, and an optocoupler chip of model IL205 AT;
one end of the first voltage dividing resistor is connected with an external power supply, the other end of the first voltage dividing resistor is connected with the positive input end of the optical coupler chip, the negative input end of the optical coupler chip is connected with the signal acquisition board, one end of the second voltage dividing resistor is connected with the external power supply, and the output end of the optical coupler chip is respectively connected with the other end of the second voltage dividing resistor, the chip selection end of the first analog switch chip and the chip selection end of the second analog switch chip.
8. The fuel cell stack monolithic voltage detection device of claim 7, wherein the single voltage patrol board further comprises an isolated power supply for converting the external power supply to an isolated voltage;
the isolation power supply is used for supplying power to the first analog switch chip, the second analog switch chip, the differential amplifying circuit and the signal isolation conversion circuit.
9. The fuel cell stack monolithic voltage detection device according to claim 1, wherein the signal acquisition board is accessible to eight single voltage patrol boards, and the second analog switch chip is accessible to four first analog switch chips.
10. A fuel cell stack individual voltage detection system, characterized in that the fuel cell stack individual voltage detection system comprises the fuel cell stack individual voltage detection device according to any one of claims 1 to 9.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865942A (en) * | 2010-04-07 | 2010-10-20 | 大连交通大学 | Voltage itinerant measurement circuit of low-power methanol fuel cell |
| CN201654186U (en) * | 2009-12-02 | 2010-11-24 | 天津光电通信技术有限公司 | Large-scale signal detecting equipment |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201654186U (en) * | 2009-12-02 | 2010-11-24 | 天津光电通信技术有限公司 | Large-scale signal detecting equipment |
| CN101865942A (en) * | 2010-04-07 | 2010-10-20 | 大连交通大学 | Voltage itinerant measurement circuit of low-power methanol fuel cell |
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