CN108761350B - Fuel cell stack single voltage inspection system with start-stop balance control - Google Patents
Fuel cell stack single voltage inspection system with start-stop balance control Download PDFInfo
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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 discloses a fuel cell stack single cell voltage inspection system with start-stop balance control, which comprises: the device comprises a fuel cell stack, an optocoupler gating circuit, a decoder module, a parity conversion module, a signal conditioning circuit, an equalization control module, a controller and a CAN module. The optocoupler gating circuit sequentially gates each single battery, the parity conversion module corrects the positive and negative relation of the voltage signals, and the positive and negative relation is input into the controller A/D converter through the signal conditioning circuit. The balance circuit consumes residual gas through the energy dissipation resistor, high potential is avoided, and the battery cell counter electrode can play a role in protection through the parasitic diode. The invention has high measurement accuracy, high measurement speed and strong communication capability, can be expanded, and meets the voltage detection requirement of the fuel cell stack monomer. Meanwhile, in the start-stop stage, the uniformity of the voltage balance of the single battery is obviously improved, the generation of a hydrogen-air interface is effectively avoided, and the service life of the electric pile is prolonged.
Description
Technical Field
The invention relates to the technical field of voltage signal acquisition of expandable series unit arrays, in particular to a fuel cell stack single voltage inspection system with start-stop balance control.
Background
Energy storage systems or energy conversion systems are an important component of the energy field, wherein energy storage batteries and fuel cells are very widely used energy storage devices and energy conversion devices. The fuel cell is a device for directly converting chemical energy in fuel oxidant into electric energy through electrochemical reaction, taking oxyhydrogen fuel cell as an example, the product is only water, and the device has the characteristics of high energy utilization rate and no pollution, so the device is known as a final solution of new energy automobiles. Whether the energy storage battery or the fuel battery is connected in series or in parallel, the energy storage battery or the fuel battery can be practically applied. In order to ensure the safety of the system, the single voltage signal of the fuel cell needs to be detected in real time, wherein the single voltage signal of the fuel cell is small and has remarkable fluctuation, so the invention mainly focuses on the voltage signal detection of the fuel cell.
The essence of the voltage detection of the fuel cell unit is that the voltage signal acquisition of the series unit array can be expanded, and corresponding patents are published aiming at the voltage inspection system of the fuel cell unit, and the voltage detection method mainly comprises three types: resistor voltage division and multipath analog switching method, optocoupler relay method, and special acquisition chip method. Chinese patent 1 (CN 201859204U) proposes a multi-way switch simulation method, wherein two multi-way switches are adopted to count 32 channels, but only 15 sections of monomers are collected, so that the utilization rate is low; second, there will be a potential build up in the 15 cell neutral connection to the COM common. The scheme of the optocoupler relay is adopted in both Chinese patent 2 (CN 1746695A) and Chinese patent 3 (CN 102288813A), so that the method has the advantages compared with a multipath analog switch, the differential signal is adopted for collecting single voltage in Chinese patent 2, accumulated potential can be well eliminated, but the negative signal is directly eliminated by an absolute value circuit, and no other logic means is used for analyzing the signal, so that the system fault diagnosis is not facilitated; the Chinese patent 3 can measure positive and negative signals to effectively overcome the defect of the Chinese patent 2, but the method that the rear end of the battery gate is grounded adopted by the Chinese patent 3 can cause potential accumulation, and the gate switching process is complex. The LTC6803 chip is adopted to collect the voltage of the fuel cell in chinese patent 4 (CN 105044440A), the LTC chip manual has already described that it has a requirement on the total voltage of the measured object, and it must be ensured that the sum of the voltages of the individual cells is at least 10V to meet all electrical specifications, but each LTC chip in patent 4 only supports 12 voltage collection of the individual cells, but the normal working voltage of the fuel cell is 0.6-0.8V, so the principle of the scheme is not feasible.
During the start-up and shut-down of the fuel cell, significant differences in the cell voltages of the fuel cells occur, which are caused by differences in the inherent properties of the cells, on the one hand, and by maldistribution of gas supply or consumption, on the other hand, which can cause voltage fluctuation peaks that affect the life of the cell. Secondly, a hydrogen-air interface is generated in the anode of the battery in the start-stop process of the fuel battery, which causes oxidation reaction in the anode of the battery, and finally leads to high potential of the cathode, so that the fuel battery is reversed in polarity, the catalyst carbon carrier is continuously corroded, and the service life of the battery is seriously damaged. Therefore, it is necessary to enter the necessary means to avoid the occurrence of the above phenomenon. At present, a common method is to introduce an auxiliary load to consume oxygen in a cathode so as to effectively control the decay rate of performance, but in the method, the auxiliary load is connected at two ends of a pile, so that the fuel cell cannot be interfered locally, and in addition, once the phenomenon of opposite poles occurs, no corresponding protection measures exist.
Disclosure of Invention
The invention aims to provide a fuel cell single voltage inspection system with start-stop balance control, which is used for detecting the voltage states of a fuel cell fixed power supply and a power supply and controlling the start-stop balance, and effectively avoids potential danger and faults of the fuel cell operation, so that the fuel cell is safer and more stable in the use process.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a fuel cell voltage patrol system with start-stop balance control, the system comprising: the device comprises a fuel cell stack, an optocoupler gating circuit, a decoder module, a parity conversion module, a signal conditioning circuit, an equalization control module, a controller and a CAN module. The optocoupler gating circuit gates two ends of the single battery to realize direct measurement of the voltage of the single battery, the decoder module and the controller are used for controlling the on-off of the optocoupler relay, each unit comprises 16 double-channel optocoupler relays, and 31 single voltages can be collected. The odd-even conversion circuit is used for modifying the positive-negative relationship of differential signals, when the single body with odd number is connected with CV+ at the positive pole, when the single body with even number is connected with CV+ at the negative pole, the single body with even number is connected with CV-, and CV+ at the negative pole, so that in order to make the differential signals input by the signal conditioning circuit positive, two optocoupler relays are used for modifying the positive-negative relationship of the differential signals, so that the positive pole of each single body is connected with OP_CV+ and the negative pole is connected with OP_CV-. The signal conditioning circuit converts the differential signal into a voltage range which can be born by the controller A/D collector and mainly comprises two stages of operational amplifiers, wherein the first stage of operational amplifier is a differential amplifying circuit, and a diode between the in-phase input end and the opposite-phase input end plays a role in protection to prevent the differential mode signal from being overlarge; the second stage is a voltage follower circuit, a first-order RC low-pass filter is connected behind the second stage to filter high-frequency signals, and the output voltage is clamped at 0-5V by the double diodes of the output port. The equalization circuit is used for consuming residual gas through the energy consumption resistor to avoid high potential, and meanwhile, when the battery cell is in the opposite polarity, the equalization circuit can protect the battery through the parasitic diode. The equalization control module is used for selectively opening a corresponding equalization circuit according to the acquired voltage, and is realized by adopting a four-channel MOS tube driving chip. The controller and the CAN module are used for collecting the single voltage, controlling the balance and transmitting the data.
The optocoupler selection circuit consists of 16 double-channel optocoupler relays PMn (n=1, 2,3, … …, 16), the relay input ends Bn (n=0, 1,2, … …, 31) are sequentially connected with the cathode and the anode of each single battery, the relay output end at the lower side of the PMn is connected with CV-, and the relay output end at the upper side of the PMn is connected with CV+. The anode input ends of the light emitting diodes are connected with the current limiting resistor, the cathode output ends of the light emitting diodes at the lower side of the PMn are respectively connected with the decoder modules XAn (n=0, 1,2, … …, 15), and the cathode output ends of the light emitting diodes at the upper side of the PMn are respectively connected with the decoder modules XBN (n=0, 1,2, … …, 15).
The parity converter module comprises 2 double-channel optocoupler relays PMOdd and PMEven, anode input ends of light emitting diodes on the upper sides of the PMOdd and PMEven are connected with VCC, an upper cathode output end is connected with a lower anode output end, and the lower cathode output end is respectively connected with controller input ends Cell_Odd and Cell_Even; PMOdd upper side relay input/output end links to each other with CV+, OP_CV+ respectively, and lower side relay input/output end links to each other with CV-, OP_CV-, respectively, and PMEven relay side is similar with PMOdd, only exchanges CV+ and CV's position.
The signal conditioning circuit comprises two stages of operational amplifiers U1 and U2, the front end of the U1 is connected with differential signals (OP_CV+ and OP_CV-) through precise resistors (R2 and R3), diodes (D1 and D2) are connected between the differential signals, the R1, C1 and C2 form a filter circuit, the output of the U1 is connected with the positive input end of the U2, and the output end of the U2 is connected with RC circuits (R6 and C5) and then connected with clamping double diodes (D3 and D4).
The equalization circuit consists of an MOS tube, a parasitic diode, a voltage stabilizing tube, an energy consumption resistor and a current limiting resistor, wherein the source electrode of the MOS tube is connected with the single positive electrode, one end of the energy consumption resistor is connected with the drain electrode of the MOS tube, the other end of the energy consumption resistor is connected with the single negative electrode, the grid electrode of the MOS tube is connected with an equalization control module Sn (n=1, 2,3, … … and 31) through the current limiting resistor, the anode and the cathode of the parasitic diode are respectively connected with the drain electrode and the source electrode of the MOS tube, the anode of the voltage stabilizing tube is connected with the grid electrode of the MOS tube, and the cathode of the voltage stabilizing tube is connected with the single positive electrode.
The equalization control module consists of 8 four-channel MOS tube driving chips USn (n=1, 2,3, … …, 8), 8 chip output ends (Y1, Y2, Y3, Y4) are respectively connected with Sn (n=1, 2,3, … …, 31), input control ends (A1, A2, A3, A4) are respectively connected with controller I/O ports CTSn (n=1, 2,3, … …, 31), enabling ends (1E 2, 2E1, 2E 2) are connected with a 2.4V power supply, and VCC1, VCC2, VCC3 are respectively connected with 5V, 20V and 24V.
Compared with the prior art, the invention has the advantages that:
by adopting the technical scheme of the system, the voltage of the single fuel cell can be detected rapidly and accurately, and the voltage balance consistency of the single fuel cell can be improved obviously in the start-stop stage. During the starting process, the oxygen starvation phenomenon of the fuel cell is avoided; in the shutdown process, the balance circuit consumes residual gas through the energy dissipation resistor, so that high potential is avoided, the generation of a hydrogen-air interface is effectively avoided, and the service life of the electric pile is prolonged. When the hydrogen-air interface is generated to cause the battery cell to be reversed, the parasitic diode can protect the battery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below.
FIG. 1 is a diagram of an overall architecture of a fuel cell stack cell voltage inspection system with start-stop balance control provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a decoder module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a parity-to-parity-converter module provided in an embodiment of the present invention;
FIG. 4 is a schematic diagram of a signal conditioning circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an equalization control module provided in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present 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 fall within the scope of the invention.
Examples
Fig. 1 is a diagram showing an overall architecture of a fuel cell stack cell voltage inspection system with start-stop balance control, the system comprising: the device comprises a fuel cell stack, an optocoupler gating circuit, a decoder module, a parity conversion module, a signal conditioning circuit, an equalization control module, a controller and a CAN module. The optocoupler gating circuit gates two ends of the single battery, so that direct measurement of the voltage of the single battery is realized, the problem of potential accumulation is solved, the decoder module and the controller are used for controlling the on-off of the optocoupler relay, each unit comprises 16 double-channel optocoupler relays, and 31 single voltages can be acquired. The odd-even conversion circuit mainly modifies the positive-negative relationship of differential signals, when the single body with odd number is connected with CV+ at the positive pole, when the single body with even number is connected with CV+ at the negative pole, the single body with even number is connected with CV-, and the single body with even number is connected with CV+ at the negative pole, so that in order to make the differential signals input by the signal conditioning circuit positive, two optocoupler relays are used for modifying the positive-negative relationship of the differential signals, so that the positive pole of each single body is connected with OP_CV+ and the negative pole is connected with OP_CV-. The signal conditioning circuit converts the differential signal into a voltage range which can be born by the AD collector of the controller, and mainly comprises a two-stage operational amplifier, wherein the first-stage operational amplifier is a differential amplifying circuit, and a diode between an in-phase input end and an opposite-phase input end plays a role in protection to prevent the differential mode signal from being overlarge; the second stage is a voltage follower circuit, a first-order RC low-pass filter is connected behind the second stage to filter high-frequency signals, and the output voltage is clamped at 0-5V by the double diodes of the output port. The equalization circuit mainly consumes residual gas through the energy consumption resistor to avoid high potential, and meanwhile, when the battery cell is in the opposite polarity, the equalization circuit can protect the battery through the parasitic diode. The equalization control module is mainly used for selectively opening a corresponding equalization circuit according to the acquired voltage and is realized by adopting a four-channel MOS tube driving chip. The controller and the CAN module are used for collecting the single voltage, controlling the balance and transmitting the data.
Each inspection unit comprises 16 optocoupler relays PMn (n=1, 2,3, … …, 16), two-channel optocoupler relays AQW EHA are selected, relay input ends Bn (n=0, 1,2, … …, 31) are sequentially connected with the negative pole and the positive pole of each single battery, the output end of a relay on the lower side of the PMn is connected with CV-, and the output end of a relay on the upper side of the PMn is connected with CV+. The anode input ends of the light emitting diodes are connected with the current limiting resistor, the cathode output ends of the light emitting diodes at the lower side of the PMn are respectively connected with the decoder modules XAn (n=0, 1,2, … …, 15), and the cathode output ends of the light emitting diodes at the upper side of the PMn are respectively connected with the decoder modules XBN (n=0, 1,2, … …, 15).
Fig. 2 shows a schematic diagram of a decoder module, which includes two 4-choice 16 CD74HC154 decoders, where 4 chip-choice input terminals CTAn (n=1, 2,3, 4) and CTBn (n=1, 2,3, 4) of the two decoders are connected to the controller I/O ports, and each path of XAn (n=0, 1,2, … …, 15) and XBn (n=0, 1,2, … …, 15) is selected by setting the output high and low levels of the corresponding I/O ports, thereby selecting a single cell of the stack. When the single body with the serial number (2n+1) (n=0, 1,2, … …, 15) is to be selected, the decoder devices XA (n) and XB (n) are required to be controlled to be low, and when the single body with the serial number (2 n) (n=1, 2,3, … …, 15) is to be selected, the decoder devices XA (n) and XB (n-1) are required to be controlled to be low.
FIG. 3 is a schematic diagram of a parity-based converter module, which includes 2 dual-channel optocoupler relays PMOdd and PMEven, wherein two-channel optocoupler relays AQW EHA and PMOdd are selected and connected with VCC at anode input ends of LEDs at upper sides, and connected with lower anode output ends at cathode output ends at upper sides, and connected with controller input ends at cell_Odd and cell_Even respectively; PMOdd upper side relay input/output end links to each other with CV+, OP_CV+ respectively, and lower side relay input/output end links to each other with CV-, OP_CV-, respectively, and PMEven relay side is similar with PMOdd, only exchanges CV+ and CV's position. After gating a certain monomer, the monomer with the serial number of odd number (positive electrode is connected with CV+, negative electrode is connected with CV+), and the monomer with the serial number of even number (positive electrode is connected with CV-, negative electrode is connected with CV+), in order to conveniently collect voltage signals between CV+ and CV-, a parity converter module is collected, the positive electrode is always connected with OP_CV+, and the negative electrode is always connected with OP_CV-. When the Odd-numbered monomers are gated, setting cell_Odd to 0 and cell_even to 1 through the controller; when even numbered cells are strobed, then cell_odd is set to 1 and cell_even is set to 0 by the controller.
Fig. 4 shows a schematic diagram of a signal conditioning circuit, voltage signals are connected with op_cv+ and op_cv-after passing through a parity converter circuit, in order to collect the voltage signals, the signal conditioning circuit adopts two stages of operational amplification, a first stage of operational amplification U1 is a differential operational amplification, a second stage of operational amplification U2 is a voltage follower, LM2094 is selected, the voltage signals are connected with precision resistors (R2 and R3) after passing through R1, C1 and C2 filter circuits, access diodes (D1 and D2) between in-phase and anti-phase input ends play a role in protecting, differential mode signals are prevented from being excessively large, the output of U1 is connected with the input end of U2 in-phase, the output end of U2 is connected with an RC circuit (R6 and C5) and then connected with clamping double diodes (D3 and D4), and output voltage is limited to be between 0 and 5V, and input safety of a controller is ensured.
The signal conditioning circuit output signal Vin connects controller AD module, and the controller is 112 pin MC9S12XEP100, and it is 16 microprocessor, contains two 12 bit A/D modules, can guarantee the high accuracy collection of voltage, and opto-coupler relay switching speed is fast simultaneously, consequently can guarantee monomer voltage acquisition' S rapidity and accuracy.
The components mainly meet the requirement of inspection of the single voltage of the fuel cell stack, and the equalization circuit and the equalization module mainly ensure the safety of the fuel cell in the starting and stopping process.
The equalization circuit is composed of an MOS tube, a parasitic diode, a voltage stabilizing tube, an energy consumption resistor and a current limiting resistor, wherein the source electrode of the MOS tube is connected with the anode of the single body, one end of the energy consumption resistor is connected with the drain electrode of the MOS tube, the other end of the energy consumption resistor is connected with the cathode of the single body, the grid electrode of the MOS tube is connected with an equalization control module Sn (n=1, 2,3, … …, 31) through the current limiting resistor, the anode and the cathode of the parasitic diode are respectively connected with the drain electrode and the source electrode of the MOS tube, the anode of the voltage stabilizing tube is connected with the grid electrode of the MOS tube, and the cathode of the voltage stabilizing tube is connected with the anode of the single body. The MOS tube selects the P-type MOS tube Si2351DS, sn plays a role in digital output, the on-off of the MOS tube is controlled, the power of the energy consumption resistor is 1W, the voltage stabilizing tube selects BZX384C12, the voltage difference between the single positive electrode and the balanced control end is ensured to be stable, and the parasitic diode ensures the safety of the battery during the reverse electrode.
Fig. 5 shows a schematic diagram of an equalization control module, which is composed of 8 four-channel MOS transistor driving chips USn (n=1, 2,3, … …, 8), SN75374 chips are adopted, 8 chip output ends (Y1, Y2, Y3, Y4) are respectively connected with SN (n=1, 2,3, … …, 31), input control ends (A1, A2, A3, A4) are respectively connected with a controller I/O port CTSn (n=1, 2,3, … …, 31), and an enabling end (1E 2, 2E1, 2E 2) is connected with a 2.4V power supply, and VCC1, VCC2, VCC3 is respectively connected with 5V, 20V, 24V. The high level and the low level of CTSn are controlled by the controller, and the on-off of the MOS tube can be controlled by the driving chip, so that the energy consumption resistor can consume residual gas in the start-stop process, and the occurrence of high potential is avoided.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a take start-stop balanced control's fuel cell monomer voltage inspection system which characterized in that, this system includes: the system comprises a fuel cell stack, an optocoupler gating circuit, a decoder module, an odd-even conversion module, a signal conditioning circuit, an equalizing control module, a controller and a CAN module, wherein the optocoupler gating circuit gates two ends of a single cell to realize direct measurement of the voltage of the single cell; the decoder module and the controller are used for controlling the on-off of the optocoupler relay, each unit comprises 16 double-channel optocoupler relays, and 31 single voltage can be acquired; the odd-even conversion module is used for correcting the positive-negative relationship of differential signals, when the single body with the odd-numbered flux is connected with CV+, the positive electrode is connected with CV-, and the single body with the even-numbered flux is connected with CV+, and the negative electrode is connected with CV+, so that in order to make the differential signals input by the signal conditioning circuit positive, two optocoupler relays are used for correcting the positive-negative relationship of the differential signals, so that the positive electrode of each single body is connected with OP_CV+, and the negative electrode is connected with OP_CV-; the signal conditioning circuit converts differential signals into a voltage range which can be born by the AD collector of the controller and mainly comprises two stages of operational amplifiers, wherein the first stage of operational amplifier is a differential amplifying circuit, and a diode between an in-phase input end and an opposite-phase input end plays a role in protection to prevent the differential mode signals from being overlarge; the second stage is a voltage follower circuit, a first-order RC low-pass filter is connected to the second stage to filter high-frequency signals, and the output voltage is clamped at 0-5V by the double diodes of the output port; the equalization circuit is used for consuming residual gas through the energy consumption resistor to avoid high potential, and meanwhile, when the battery monomer is in the opposite polarity, the parasitic diode can protect the battery; the equalization control module is used for selectively opening a corresponding equalization circuit according to the acquired voltage and is realized by adopting a four-channel MOS tube driving chip; the controller and the CAN module are used for collecting the single voltage, controlling the balance and transmitting the data.
2. The fuel cell voltage inspection system with start-stop balance control according to claim 1, wherein the optocoupler selection circuit is composed of 16 dual-channel optocoupler relays PMn (n=1, 2,3, … …, 16), a relay input end Bn (n=0, 1,2, … …, 31) is sequentially connected with the cathode and the anode of each cell, a lower side relay output end of the PMn is connected with a CV-, and an upper side relay output end of the PMn is connected with the cv+; the anode input ends of the light emitting diodes are connected with the current limiting resistor, the cathode output ends of the light emitting diodes at the lower side of the PMn are respectively connected with the decoder modules XAn (n=0, 1,2, … …, 15), and the cathode output ends of the light emitting diodes at the upper side of the PMn are respectively connected with the decoder modules XBN (n=0, 1,2, … …, 15).
3. The fuel Cell unit voltage inspection system with start-stop balance control according to claim 1, wherein the parity conversion module comprises 2 dual-channel optocoupler relays PMOdd, PMEven, PMOdd, PMEven upper side light emitting diode anode input ends are all connected with VCC, upper side cathode output ends are connected with lower side anode output ends, and lower side cathode output ends are respectively connected with controller input ends cell_odd and cell_even; PMOdd upper side relay input/output end links to each other with CV+, OP_CV+ respectively, and lower side relay input/output end links to each other with CV-, OP_CV-, respectively, and PMEven relay side is similar with PMOdd, only exchanges CV+ and CV's position.
4. The fuel cell voltage inspection system with start-stop balance control according to claim 1, wherein the signal conditioning circuit comprises two stages of operational amplifiers U1 and U2, the front end of the U1 is connected with differential signals (OP_CV+, OP_CV-) through precise resistors (R2 and R3), diodes (D1 and D2) are connected between the differential signals, the R1, C1 and C2 form a filter circuit, the output of the U1 is connected with the non-inverting input end of the U2, and the output end of the U2 is connected with RC circuits (R6 and C5) and then is connected with clamping double diodes (D3 and D4).
5. The fuel cell voltage inspection system with start-stop balance control according to claim 1, wherein the balance circuit is composed of an MOS tube, a parasitic diode, a voltage stabilizing tube, an energy dissipation resistor and a current limiting resistor, a source electrode of the MOS tube is connected with a single positive electrode, one end of the energy dissipation resistor is connected with a drain electrode of the MOS tube, the other end of the energy dissipation resistor is connected with a single negative electrode, a grid electrode of the MOS tube is connected with a balance control module Sn (n=1, 2,3, … …, 31) through the current limiting resistor, an anode and a cathode of the parasitic diode are respectively connected with the drain electrode and the source electrode of the MOS tube, an anode of the voltage stabilizing tube is connected with the grid electrode of the MOS tube, and a cathode of the voltage stabilizing tube is connected with the single positive electrode.
6. The fuel cell voltage inspection system with start-stop balance control according to claim 1, wherein the balance control module is composed of 8 four-channel MOS transistor driving chips USn (n=1, 2,3, … …, 8), 8 chip output ends (Y1, Y2, Y3, Y4) are respectively connected with Sn (n=1, 2,3, … …, 31), input control ends (A1, A2, A3, A4) are respectively connected with controller I/O ports CTSn (n=1, 2,3, … …, 31), and enable ends (1E 2, 2E1, 2E 2) are respectively connected with 2.4V power sources, VCC1, VCC2, VCC3 are respectively connected with 5V, 20V, 24V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810970238.5A CN108761350B (en) | 2018-08-24 | 2018-08-24 | Fuel cell stack single voltage inspection system with start-stop balance control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810970238.5A CN108761350B (en) | 2018-08-24 | 2018-08-24 | Fuel cell stack single voltage inspection system with start-stop balance control |
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| Publication Number | Publication Date |
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| CN108761350A CN108761350A (en) | 2018-11-06 |
| CN108761350B true CN108761350B (en) | 2024-02-23 |
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| CN110247085A (en) * | 2019-03-29 | 2019-09-17 | 上海楞次新能源汽车科技有限公司 | A kind of fuel cell voltage check device that channel is configurable |
| CN110716147A (en) * | 2019-11-14 | 2020-01-21 | 云蜂数智物联网有限公司 | Method and device for measuring internal resistance of battery pack |
| CN111409508B (en) * | 2020-03-31 | 2022-07-15 | 潍柴动力股份有限公司 | Vehicle-mounted fuel cell system and control method thereof |
| CN115832364B (en) * | 2023-02-15 | 2023-05-05 | 海卓动力(青岛)能源科技有限公司 | Engine start control method for hydrogen fuel cell |
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