Hydrogen discharge valve driving circuit and fuel cell system

Abstract

The utility model relates to the technical field of fuel cells, and particularly provides a hydrogen discharge valve driving circuit and a fuel cell system. The hydrogen discharge valve driving circuit comprises a detection unit, a comparison unit, a valve driving unit and a power supply unit which are electrically connected in sequence. Wherein the detection unit comprises a first detection unit and a second detection unit, and the first detection unit detects the air in-pile pressure and outputs a first detection signal; the second detection unit detects the hydrogen in-pile pressure and outputs a second detection signal. The comparison unit comprises a first comparison unit and a second comparison unit, the first comparison unit compares the two detection signals and outputs a first control signal, and the second comparison unit compares the two detection signals or compares the first control signal with a reference voltage and outputs a second control signal; the valve driving unit can respond to input of the first control signal or the second control signal, and the power supply state of the hydrogen discharging valve is changed. The hydrogen discharge valve driving circuit improves the driving control reliability of the hydrogen discharge valve.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technical field, especially a kind of hydrogen discharge valve drive circuit. BACKGROUND

[0002] With the development and application of fuel cell technology, the safety of fuel cell system is also more and more valued by people. A hydrogen discharge valve is usually provided on the hydrogen supply path of the stack to be opened in time when the hydrogen pressure or concentration reaches the preset safety threshold, so as to be emptied to ensure the safety and stability of the stack operation.

[0003] In the prior art, the driving control of the hydrogen discharge valve is mainly based on the hydrogen concentration of the hydrogen outlet for timing switch control, and when the hydrogen path is abnormal, the opening of the hydrogen discharge valve is driven by collecting hydrogen pressure data through software. However, the existing control scheme cannot avoid the driving failure caused by the single failure of the control element, which may cause serious consequences of the fuel cell system, and the pure software driving has a high delay, which may cause the hydrogen discharge valve to be unable to open in time, and thus cause the short-term overpressure of the fuel cell proton exchange membrane. Once the hydrogen supply path is overpressured, the fuel cell proton exchange membrane is easily overpressured, thereby causing irreversible mechanical damage to the fuel cell proton exchange membrane. SUMMARY

[0004] Therefore, the utility model aims at providing a hydrogen discharge valve drive circuit to improve the driving control reliability of the hydrogen discharge valve.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A hydrogen discharge valve drive circuit, comprising a detection unit, a comparison unit and a valve driving unit connected in sequence, and a power supply unit;

[0007] The detection unit comprises a first detection unit and a second detection unit, the first detection unit is used for detecting the air inlet pressure of the fuel cell system and outputting a first detection signal, and the second detection unit is used for detecting the hydrogen inlet pressure of the fuel cell system and outputting a second detection signal; The comparison unit comprises a first comparison unit and a second comparison unit, the first comparison unit compares the first detection signal and the second detection signal and outputs a first control signal, and the second comparison unit compares the first detection signal and the second detection signal, or compares the first control signal and the reference voltage provided by the power supply unit and outputs a second control signal; The valve driving unit can respond to the input of the first control signal or the second control signal, change the power supply state of the power supply unit to the hydrogen discharge valve, to control the opening or closing of the hydrogen discharge valve.

[0008] Further, the first comparison unit comprises a first comparison module powered by the power supply unit, the first comparison module having a first inverting input end for receiving the first detection signal input, a first non-inverting input end for receiving the second detection signal input, and a first output end outputting the first control signal.

[0009] Further, the second comparison unit comprises a second comparison module powered by the power supply unit, the second comparison module having a second non-inverting input end, a second inverting input end, and a second output end connected to the valve driving unit; the second non-inverting input end is connected to the first output end, the second inverting input end is connected to the low-voltage side of the power supply unit, and the second comparison module outputs the second control signal based on the comparison result of the first control signal outputted by the first output end and the reference voltage provided by the low-voltage side of the power supply unit.

[0010] Further, at least one of the first comparison module and the second comparison module adopts an operational amplifier.

[0011] Further, a master control unit is further included, the first output end is connected to an input port of the master control unit, and the valve driving unit is connected to an output port of the master control unit; the master control unit receives the input of the first control signal and sends a corresponding control signal to the valve driving unit.

[0012] Further, a rectifier diode is arranged on the connection line between the output port of the master control unit and the valve driving unit, and on the connection line between the second output end and the valve driving unit.

[0013] Further, a first adjusting resistor is connected between the low-voltage side of the power supply unit and the first inverting input end, and a second adjusting resistor is connected between the first non-inverting input end and the first output end; and / or, a third adjusting resistor and a fourth adjusting resistor are connected in series between the high-voltage side and the low-voltage side of the power supply unit, and the second inverting input end is connected to the line between the third adjusting resistor and the fourth adjusting resistor.

[0014] Further, the valve driving unit comprises a field effect transistor, the drain and the source of the field effect transistor are connected to the hydrogen discharge valve and the low-voltage side of the power supply unit respectively, and the gate of the field effect transistor is used to connect the output port of the master control unit and the second output end.

[0015] Further, the first detection unit comprises a first detection circuit connected between the first inverting input end and the air inlet pressure detection element, and a first capacitor and a first resistor arranged in parallel between the first detection circuit and the low voltage side of the power supply unit; and / or, the second detection unit comprises a second detection circuit connected between the first non-inverting input end and the hydrogen inlet pressure detection element, and a second capacitor and a second resistor arranged in parallel between the second detection circuit and the low voltage side of the power supply unit.

[0016] Compared with the prior art, the utility model has following advantages:

[0017] The hydrogen discharge valve driving circuit of the utility model adopts first detection unit and second detection unit to detect air inlet pressure and hydrogen inlet pressure respectively, and through the redundant setting of first comparison unit and second comparison unit, the pressure difference of air inlet pressure and hydrogen inlet pressure can be compared and determined at the same time; wherein, the first control signal output by the first comparison unit can bypass the second comparison unit, and after logical processing by the main control unit MCU, a control signal is sent to control the valve driving unit, so as to form the redundant driving control of software and hardware of the valve driving unit. In this way, the fault abnormality caused by single point control failure can be avoided, and the driving control reliability of the hydrogen discharge valve is improved.

[0018] In addition, the first comparison unit and the second comparison unit both adopt comparison modules to realize the comparison and determination of the two groups of input voltage signals, and then output the required control signal, realizing the hardware detection and comparison control of the air inlet pressure and the hydrogen inlet pressure, and then forming the redundant direct driving control mode, and the hardware level driving can realize the microsecond level control response, and when the hydrogen circuit appears overpressure fault, the hydrogen discharge valve can be opened in time to realize pressure relief.

[0019] In addition, by setting the main control unit, the first control signal can be analyzed, compared and processed by the main control unit, and then the corresponding control signal is output to the valve driving unit, so that the opening and closing control of the hydrogen discharge valve can be realized, the voltage specification of the first control signal can be flexibly adjusted and changed, so that the control needs of the valve driving unit can be met, and the driving control state of the valve driving unit can be fed back through the main control unit, and the recording of the related control signal is facilitated. Under the cooperation of the main control unit and the second comparison module, the control signal output by the output port of the main control unit and the second control signal output by the second output end of the second comparison module can be sent to the valve driving unit at the same time, realizing the control of the valve driving unit, and the abnormality of one of the main control unit and the second comparison module does not affect the normal driving of the hydrogen discharge valve.

[0020] Another purpose of the utility model lies in providing a fuel cell system, the fuel cell system is equipped with hydrogen discharge valve, and the utility model discloses a hydrogen discharge valve drive circuit. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings constituting a part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and the front and back, up and down and other orientation words involved in the utility model are only used to show relative position relation, and all do not constitute undue limitation on the utility model.

[0022] Figure 1 The circuit principle schematic diagram of the hydrogen discharge valve drive circuit of the utility model embodiment.

[0023] Mark explanation:

[0024] 1, first detection unit;C1, first capacitor;R1, first resistance;R3, first voltage dividing resistance;10, first detection circuit;

[0025] 2, second detection unit;C2, second capacitor;R2, second resistance;R4, second voltage dividing resistance;20, second detection circuit;

[0026] 3, first comparison unit;U1, first comparison module;R5, first adjusting resistance;R6, second adjusting resistance;

[0027] 4, second comparison unit;U2, second comparison module;R11, third adjusting resistance;R12, fourth adjusting resistance;

[0028] 5, valve drive unit;Q3, field effect transistor;R7, third voltage dividing resistance;R8, shunt resistance;

[0029] MCU, main control unit;VCC, control power supply;VBA, drive power supply;FPV, hydrogen discharge valve;

[0030] D1, first rectifier diode;D2, second rectifier diode;D3, third rectifier diode. DETAILED DESCRIPTION

[0031] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0032] In the description of the utility model, unless otherwise expressly limited, the terms "mounting", "connection", "connection", "connecting piece" should be understood broadly. For example, the connection can be fixed connection, or detachable connection, or integrally connected; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate media, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances. In the description of the utility model, the limiting terms "first, second, a, b, c, d" and the like appear, which are only for distinguishing the same features of different positions, attributions or purposes, to avoid ambiguity and confusion in the description, and cannot be understood as indicating or implying relative importance.

[0033] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0034] Embodiment one

[0035] The embodiment relates to a hydrogen exhaust valve driving circuit, which is beneficial to improving the driving control reliability of a hydrogen exhaust valve FPV, and an exemplary circuit principle is as shown in the figure. Figure 1

[0036] Overall, the hydrogen exhaust valve driving circuit comprises a detection unit, a comparison unit and a valve driving unit 5 connected in sequence, and a power supply unit. The detection unit comprises a first detection unit 1 and a second detection unit 2; the first detection unit 1 is used for detecting the air inlet pressure of a fuel cell system and outputs a first detection signal; the second detection unit 2 is used for detecting the hydrogen inlet pressure of the fuel cell system and outputs a second detection signal. The comparison unit comprises a first comparison unit 3 and a second comparison unit 4; the first comparison unit 3 compares the first detection signal and the second detection signal and outputs a first control signal, and the second comparison unit 4 compares the first detection signal and the second detection signal, or compares the first control signal and a reference voltage provided by the power supply unit and outputs a second control signal. The valve driving unit 5 can respond to the input of the first control signal or the second control signal, so as to change the power supply state of the power supply unit to the hydrogen exhaust valve FPV, and then control the opening or closing of the hydrogen exhaust valve FPV. The valve driving unit 5 is arranged on the power supply line between the power supply unit and the hydrogen exhaust valve FPV, and can adopt a relay, a field effect transistor and the like to realize the on-off control of the line, so as to correspondingly switch the power supply state of the hydrogen exhaust valve FPV between the power-on state and the power-off state, and realize the opening and closing control of the hydrogen exhaust valve FPV.

[0037] In the response process to the first control signal, the first detection signal and the second detection signal can be compared, as shown in the figure. Figure 1 ​As shown, the first control signal output by the first comparison unit 3 is processed by the master control unit MCU, and the master control unit MCU drives the valve driving unit 5 in the form of a signal to send a corresponding control signal to the valve driving unit 5, thereby realizing control of the hydrogen exhaust valve FPV. Of course, the master control unit MCU can also not be provided, and a similar processing method as the second control signal can be used to directly connect the first control signal output by the first comparison unit 3 to the valve driving unit 5, and the driving state of the valve driving unit 5 is directly controlled by the first control signal.

[0038] It should be pointed out that based on the overall design idea described above, the technical scheme of the utility model can adopt various different specific implementation structures, forms or configuration sequences. For example, the first detection unit 1 and the second detection unit 2 described above can adopt capacitors, resistors and other electronic elements to build various forms of induction circuits that can sense the current change of the pressure detection element output. The specific setting form, connection sequence, etc. of the first comparison unit 3 and the second comparison unit 4 can also be flexibly adjusted. For the parts required for the overall scheme implementation but not involved in the overall setting described above, reasonable and flexible design can be made by referring to the mature setting means in the field, the actual situation during implementation, etc. The specific implementation scheme described below in this embodiment is only one of the relatively optimal schemes formed by various combinations and changes described above, and in actual implementation, the person skilled in the art can make flexible adjustments and improvements in combination with the actual situation. Obviously, the various specific forms of combinations and changes described above can form many schemes, and the specific implementation scheme of this embodiment is within the protection scope of the utility model.

[0039] In this embodiment, as shown in the figure, Figure 1 The first comparison unit 3 includes a first comparison module U1 powered by the power supply unit, and the first comparison module U1 has a first inverting input end for receiving a first detection signal input, a first non-inverting input end for receiving a second detection signal input, and a first output end for outputting a first control signal. Similarly, the second comparison unit 4 includes a second comparison module U2 powered by the power supply unit, and the second comparison module U2 has a second non-inverting input end, a second inverting input end, and a second output end connected to the valve driving unit 5. The second non-inverting input end of the second comparison module U2 is connected to the first output end of the first comparison module U1, the second inverting input end of the second comparison module U2 is connected to the low-voltage side of the power supply unit, and the second comparison module U2 outputs a second control signal based on the comparison result of the first control signal output by the first output end and the above-mentioned reference voltage provided by the low-voltage side of the power supply unit.

[0040] The first comparison unit 3 and the second comparison unit 4 are both realized by comparison modules to compare and judge the two groups of input voltage signals, and then output the required control signals, so as to realize the hardware detection and comparison control of the pressure signals of the air inlet stack pressure and the hydrogen inlet stack pressure, and then form a redundant direct drive control mode. The hardware level drive can realize microsecond-level control response, and the hydrogen discharge valve FPV can be opened in time to realize pressure relief when an overpressure fault occurs in the hydrogen path.

[0041] Based on the above setting, the first detection unit 1 of the embodiment includes a first detection line 10 connected between the first inverting input terminal of the first comparison module U1 and the detection element of the air inlet stack pressure, and a first capacitor C1 and a first resistor R1 connected in parallel between the first detection line 10 and the low voltage side of the power supply unit. The second detection unit 2 can be set according to the case of the first detection unit 1, and specifically includes a second detection line 20 connected between the first non-inverting input terminal of the first comparison module U1 and the detection element of the hydrogen inlet stack pressure, and a second capacitor C2 and a second resistor R2 connected in parallel between the second detection line 20 and the low voltage side of the power supply unit. The first detection unit 1 and the second detection unit 2 both adopt the parallel connection mode of capacitor and resistor, which can sensitively perceive the current output change of the detection element caused by the pressure change, and then change the voltage input to the comparison module, so as to realize the accurate detection of the pressure difference change of the air inlet stack pressure and the hydrogen inlet stack pressure.

[0042] In order to make the two input terminals of the first comparison module U1 obtain suitable voltage input signals, a voltage dividing resistor can be arranged on the first detection line 10 and the second detection line 20. As shown in Figure 1 A first voltage dividing resistor R3 is arranged on the first detection line 10, and a second voltage dividing resistor R4 is arranged on the second detection line 20. By configuring the first voltage dividing resistor R3 and the second voltage dividing resistor R4 with suitable resistance values, the voltage specification of the detection signals output by the first detection unit 1 and the second detection unit 2 is more suitable for the input requirements of the first comparison module U1.

[0043] For the above two comparison modules, of course, there are many existing mature electronic comparison elements to choose from, and an operational amplifier is preferably used. For example, as shown in Figure 1 The first comparison module U1 and the second comparison module U2 of the embodiment can both use the AD8031ART operational amplifier produced by Yadiano.

[0044] In addition, the hydrogen discharge valve drive circuit of the embodiment further includes a master control unit MCU. The specific setting can be referred to Figure 1The first output end of the first comparison module U1 is connected to the input port of the master control unit MCU, and the valve driving unit 5 is connected to the output port of the master control unit MCU. The master control unit MCU receives the input of the first control signal and sends the corresponding control signal to the valve driving unit 5.

[0045] By setting the master control unit MCU, the first control signal is received by the master control unit MCU, which can analyze and compare the first control signal, and then output the control signal to the valve driving unit 5. While realizing the opening and closing control of the hydrogen exhaust valve FPV, the voltage specification of the first control signal can be flexibly adjusted and changed to meet the control needs of the valve driving unit 5, and it is also convenient to feedback the driving control state of the valve driving unit 5 through the master control unit MCU, and convenient for recording related control signals. Under the cooperation of the master control unit MCU and the second comparison module U2, the control signal output by the output port of the master control unit MCU and the second control signal output by the second output end of the second comparison module U2 can be sent to the valve driving unit 5 at the same time, realizing the control of the valve driving unit 5. If one of the master control unit MCU and the second comparison module U2 is abnormal, it will not affect the normal driving of the hydrogen exhaust valve FPV.

[0046] Based on the above setting, a rectifier diode can be arranged on the connection line between the second output end and the valve driving unit 5, and the connection line between the first output end and the valve driving unit 5. The arrangement of the rectifier diode can ensure the one-way conduction of the control circuit and guarantee the performance stability and reliability of the related circuit. Specifically, the hydrogen exhaust valve FPV is provided with a first rectifier diode D1 in parallel, a second rectifier diode D2 is arranged on the connection line between the second output end of the second comparison module U2 and the valve driving unit 5, and a third rectifier diode D3 is arranged on the connection line between the output port of the master control unit MCU and the valve driving unit 5.

[0047] Still as Figure 1As shown, the low voltage side of the power supply unit and the first inverting input terminal of the first comparison module U1 are further connected with a first adjusting resistor R5, and the first non-inverting input terminal and the first output terminal are connected with a second adjusting resistor R6; similarly, the high voltage side and the low voltage side of the power supply unit are further connected in series with a third adjusting resistor R11 and a fourth adjusting resistor R12, and the second inverting input terminal of the second comparison module U2 is connected to the circuit between the third adjusting resistor R11 and the fourth adjusting resistor R12. By setting the adjusting resistors R5, R6, R11 and R12, the voltage input to the input terminals of the first comparison module U1 and the second comparison module U2 can be flexibly adjusted, so as to better meet the input specification requirements of the two comparison modules, so as to more accurately compare the voltage difference between the non-inverting input terminal and the inverting input terminal, and then timely and accurately send the corresponding control signal.

[0048] For the specific setting of the power supply unit, of course, there are many different forms, for example, the first comparison unit 3, the second comparison unit 4 and the valve driving unit 5 described above can adopt the same specification power supply, or different specification power supply. In this embodiment, the first comparison module U1 and the second comparison module U2 both adopt a 5V control power supply VCC as the power supply; the valve driving unit 5 and the hydrogen discharge valve FPV are connected in series between the high voltage side and the low voltage side of the 24V driving power supply VBA, so as to ensure sufficient driving voltage of the hydrogen discharge valve FPV. The low voltage side of the control power supply VCC and the driving power supply VBA can be simultaneously grounded to make the two power supplies have the same reference voltage.

[0049] In this embodiment, the valve driving unit 5 adopts a field effect transistor Q3, the drain and the source of the field effect transistor Q3 are connected to the hydrogen discharge valve FPV and the low voltage side of the power supply unit respectively, and the gate of the field effect transistor Q3 is used to connect the output port of the main control unit MCU and the second output terminal. A shunt resistor R8 can also be provided between the gate of the field effect transistor Q3 and the low voltage side of the power supply unit, and a third voltage dividing resistor R7 can also be added to the input line of the gate of the field effect transistor Q3. By selecting shunt resistor R8 and third voltage dividing resistor R7 with appropriate resistance, the control voltage input to the gate of the field effect transistor Q3 can be adjusted to the required specification of the field effect transistor Q3. The valve driving unit 5 adopts the field effect transistor Q3, which can well meet the amplification and response requirements of the control signal, so as to turn on the driving circuit of the hydrogen discharge valve FPV and meet the driving current specification requirements of the hydrogen discharge valve FPV.

[0050] Based on the above overall setting, the hydrogen discharge valve driving circuit of this embodiment can realize microsecond-level control of the hydrogen discharge valve FPV and redundant control of the main control unit MCU control and comparison module pressure difference control, avoiding the failure and failure caused by single-point control failure. The control logic of the hydrogen discharge valve driving circuit is as follows:

[0051] The sampled value of the hydrogen inlet pressure and the sampled value of the air inlet pressure are input to the second comparison unit 4 after passing through the first comparison unit 3, and are simultaneously input to the main control unit MCU. The output port of the main control unit MCU and the second output end of the second comparison unit U2 can simultaneously output control signals to the valve driving unit 5. The air inlet pressure signal output by the detection element for air inlet pressure detection and the hydrogen inlet pressure signal output by the detection element for hydrogen inlet pressure detection have the same pressure-voltage output characteristic curve, which can guarantee the comparison result of the first comparison unit U1.

[0052] The first comparison unit 3 is a subtractor circuit, the first non-inverting input end of which receives the hydrogen pressure signal (i.e., the second detection signal), and the first inverting input end of which receives the air pressure signal (i.e., the first detection signal). The difference between the hydrogen pressure and the air pressure output by the subtractor is input to the main control unit MCU and the second comparison unit U2 as the first control signal for detection, and the value of the related resistor can be adjusted for proportional operation according to requirements.

[0053] The first comparison unit 3 outputs the first control signal to the second non-inverting input end of the second comparison unit U2, and the second inverting input end of the second comparison unit U2 receives the low-voltage side voltage of the control power supply VCC. The second comparison unit 4 compares the first control signal with the preset voltage after the voltage is adjusted by the resistor, and outputs a high-level second control signal if the first control signal is greater than the preset voltage, or outputs a low-level second control signal if the first control signal is less than the preset voltage.

[0054] The second control signal output by the second comparison unit U2 is output to the input signal line of the valve driving unit 5 after passing through the second rectifier diode D2, and the control driving signal output by the output port of the main control unit MCU is also output to the input signal line of the valve driving unit 5 after passing through the third rectifier diode D3. In this way, the main control unit MCU and the second comparison unit 4 can independently control the valve driving unit 5 of the hydrogen exhaust valve FPV.

[0055] The valve driving unit 5 of the embodiment adopts a low-side driving mode. According to the output control signals of the main control unit MCU and the second comparison unit U2, the power supply state of the driving power supply VBA to the hydrogen exhaust valve FPV is changed, so as to control the opening and closing of the hydrogen exhaust valve FPV.

[0056] In summary, the hydrogen discharge valve driving circuit of the embodiment adopts the first detection unit 1 and the second detection unit 2 to detect the air inlet pressure and the hydrogen inlet pressure respectively, and the pressure difference of the air inlet pressure and the hydrogen inlet pressure can be compared and determined simultaneously through the redundant setting of the first comparison unit 3 and the second comparison unit 4. Moreover, the first control signal output by the first comparison unit can bypass the second comparison unit and be transmitted to the main control unit MCU, and after logical processing by the main control unit MCU, the main control unit MCU sends a control signal to control the valve driving unit 5, so as to form the redundant driving control of the software and hardware of the valve driving unit 5. In this way, the failure caused by single-point control can be avoided, and even in the case that one of the main control unit MCU and the second comparison unit 4 is abnormal, the valve driving unit 5 can be controlled in time when the pressure difference of the air inlet pressure and the hydrogen inlet pressure reaches the preset safety threshold, so that the hydrogen discharge valve FPV is normally opened, and the driving control reliability of the hydrogen discharge valve FPV is improved.

[0057] Embodiment two

[0058] The embodiment relates to a fuel cell system, wherein a hydrogen discharge valve FPV and the hydrogen discharge valve driving circuit provided in the embodiment one are arranged in the fuel cell system, and the opening and closing control of the hydrogen discharge valve FPV is completed by the hydrogen discharge valve driving circuit.

[0059] The hydrogen discharge valve driving circuit of the embodiment adds a pressure difference hardware driving circuit, can realize the redundant driving control mode of software and hardware, the driving at the hardware level can realize the control response of microsecond level, the hydrogen discharge valve FPV can be opened in time to realize pressure relief when overpressure failure occurs in the hydrogen path, and the normal driving of the hydrogen discharge valve FPV is not affected when the main control unit MCU is normally controlled, so that the opening of the hydrogen discharge valve FPV in an extreme case is ensured, the rapid driving opening of the hydrogen discharge valve FPV in an emergency state is realized, the hydrogen path overpressure is prevented from occurring in the stack, and the damage of the hydrogen path overpressure to the stack is avoided.

[0060] The above is only a preferred embodiment of the utility model, and the detailed configuration explanation, specific structure setting form example, or assembly connection mode expression are all for the need of full disclosure, so that the technical personnel can better implement the utility model, and the utility model is not limited in the protection range. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection range of the utility model.

Claims

1. A hydrogen discharge valve drive circuit, characterized in that: It includes a detection unit, a comparison unit, and a valve drive unit (5) that are connected in sequence, as well as a power supply unit; The detection unit includes a first detection unit (1) and a second detection unit (2). The first detection unit (1) is used to detect the air inlet pressure of the fuel cell system and output a first detection signal. The second detection unit (2) is used to detect the hydrogen inlet pressure of the fuel cell system and output a second detection signal. The comparison unit includes a first comparison unit (3) and a second comparison unit (4). The first comparison unit (3) compares the first detection signal and the second detection signal and outputs a first control signal. The second comparison unit (4) compares the first detection signal and the second detection signal, or compares the first control signal with the reference voltage provided by the power supply unit and outputs a second control signal. The valve drive unit (5) can respond to the input of the first control signal or the second control signal and change the power supply state of the power supply unit to the hydrogen discharge valve (FPV) to control the hydrogen discharge valve (FPV) to open or close.

2. The hydrogen discharge valve drive circuit according to claim 1, characterized in that: The first comparison unit (3) includes a first comparison module (U1) powered by the power supply unit; The first comparison module (U1) has a first inverting input terminal for receiving the first detection signal input, a first non-inverting input terminal for receiving the second detection signal input, and a first output terminal for outputting the first control signal.

3. The hydrogen discharge valve drive circuit according to claim 2, characterized in that: The second comparison unit (4) includes a second comparison module (U2) powered by the power supply unit. The second comparison module (U2) has a second non-inverting input terminal, a second inverting input terminal, and a second output terminal connected to the valve drive unit (5). The second non-inverting input terminal is connected to the first output terminal, the second inverting input terminal is connected to the low-voltage side of the power supply unit, and the second comparison module (U2) outputs the second control signal based on the comparison result between the first control signal output from the first output terminal and the reference voltage provided by the low-voltage side of the power supply unit.

4. The hydrogen discharge valve drive circuit according to claim 3, characterized in that: At least one of the first comparison module (U1) and the second comparison module (U2) employs an operational amplifier.

5. The hydrogen discharge valve drive circuit according to claim 3, characterized in that: It also includes a main control unit (MCU); The first output terminal is connected to the input port of the main control unit (MCU), and the valve drive unit (5) is connected to the output port of the main control unit (MCU); The main control unit (MCU) receives the input of the first control signal and sends a corresponding control signal to the valve drive unit (5).

6. The hydrogen discharge valve drive circuit according to claim 5, characterized in that: A rectifier diode is provided on the connection line between the output port of the main control unit (MCU) and the valve drive unit (5), as well as on the connection line between the second output terminal and the valve drive unit (5).

7. The hydrogen discharge valve drive circuit according to claim 5, characterized in that: A first regulating resistor (R5) is connected between the low-voltage side of the power supply unit and the first inverting input terminal, and a second regulating resistor (R6) is connected between the first non-inverting input terminal and the first output terminal. And / or, a third regulating resistor (R11) and a fourth regulating resistor (R12) are connected in series between the high-voltage side and the low-voltage side of the power supply unit, and the second inverting input terminal is connected to the line between the third regulating resistor (R11) and the fourth regulating resistor (R12).

8. The hydrogen discharge valve drive circuit according to any one of claims 5 to 7, characterized in that: The valve drive unit (5) includes a field-effect transistor (Q3). The drain and source of the field-effect transistor (Q3) are respectively connected to the hydrogen discharge valve (FPV) and the low-voltage side of the power supply unit. The gate of the field-effect transistor (Q3) is used to connect the output port of the main control unit (MCU) and the second output terminal.

9. The hydrogen discharge valve drive circuit according to any one of claims 2 to 7, characterized in that: The first detection unit (1) includes a first detection line (10) connected between the first inverting input terminal and the detection element of the air inlet pressure, and a first capacitor (C1) and a first resistor (R1) connected in parallel between the first detection line (10) and the low-voltage side of the power supply unit. And / or, the second detection unit (2) includes a second detection line (20) connected between the first in-phase input terminal and the detection element of the hydrogen infeed pressure, and a second capacitor (C2) and a second resistor (R2) connected in parallel between the second detection line (20) and the low-voltage side of the power supply unit.

10. A fuel cell system of the aforementioned type, characterized in that: The fuel cell system includes a hydrogen discharge valve (FPV) and a hydrogen discharge valve drive circuit as described in any one of claims 1 to 9.

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