Intake and exhaust electromagnetic valve control circuit of hydrogen fuel stack

Abstract

The utility model relates to the technical field of control circuits, in particular to an intake and exhaust electromagnetic valve control circuit of a hydrogen fuel stack. The circuit comprises a DCDC module, an FCU power supply circuit module, a single-chip microcomputer, a high-side driving module and a voltage regulation circuit module. The output end of the hydrogen fuel electric pile is connected with the FCU power supply circuit module, the single chip microcomputer is connected with the FCU power supply circuit module, the input end of the high-side driving module is connected with the DCDC module, and voltage output by the electric pile is converted and stabilized to 24V through the DCDC module to serve as input to supply power to the high-side driving module; the control end of the high-side driving module is connected with four outputs of the single chip microcomputer, and the output end of the high-side driving module is connected with the four voltage regulation circuit modules respectively; the voltage is adjusted to a proper voltage through the voltage adjusting circuit module to supply power to the electromagnetic valve so as to adapt to electromagnetic valves of different voltage platforms. According to the utility model, the resistance in the voltage regulation circuit module is regulated, so that the voltage regulation circuit module can be suitable for electromagnetic valves with different voltage levels.

Description

TECHNICAL FIELD

[0001] The utility model relates to control circuit technical field, in particular to a kind of hydrogen fuel electric pile inlet and exhaust solenoid valve control circuit. BACKGROUND

[0002] With the continuous development of hydrogen fuel cell technology, its application in the field of unmanned aerial vehicle gradually attracts attention. Hydrogen fuel cell has the advantages of high energy density and long endurance time, and is considered as an important development direction of future unmanned aerial vehicle power system. However, in the prior art, there are still some problems in the control method of hydrogen fuel unmanned aerial vehicle electric pile. Specifically, hydrogen tank needs to be controlled by solenoid valve, but the specifications of unmanned aerial vehicle solenoid valve are various, some need to work at 12V, and some need to work at 24V. In addition, some need PWM duty cycle control, and some do not need it. Therefore, how to design a solenoid valve control circuit to meet the working needs of solenoid valves of different specifications has become a technical problem to be solved. UTILITY MODEL CONTENT

[0003] The utility model aims at the problems in the background art, and proposes a kind of hydrogen fuel electric pile inlet and exhaust solenoid valve control circuit.

[0004] The technical scheme of the utility model, a kind of hydrogen fuel electric pile inlet and exhaust solenoid valve control circuit, including DCDC module, FCU power supply circuit module, single-chip microcomputer, high-side drive module, voltage regulation circuit module;

[0005] The output end of hydrogen fuel electric pile is connected with FCU power supply circuit module, the single-chip microcomputer is connected with FCU power supply circuit module, the voltage of 48V output by hydrogen fuel electric pile is output to FCU power supply circuit module, which is reduced to 5V by primary voltage reduction, and then reduced to 3.3V by secondary voltage reduction, and finally output to the single-chip microcomputer;

[0006] The input end of high-side drive module is connected with DCDC module, and the voltage output by the electric pile is converted and stabilized to 24V as input by DCDC module, to supply power for high-side drive module;The control end of high-side drive module is connected with four outputs of single-chip microcomputer, and the output end of high-side drive module is connected with four voltage regulation circuit modules respectively.

[0007] The voltage of electromagnetic valve is adjusted to appropriate voltage by voltage regulation circuit module to adapt to electromagnetic valves of different voltage platforms.

[0008] Preferably, the control source of solenoid valve is the GPIO port of single-chip microcomputer.

[0009] Preferably, STM32H723 chip is selected for single-chip microcomputer, and PG4 PG5 PG6 PG7 four pins are selected to control solenoid valve.

[0010] Preferably, the high-side drive module converts the output voltage of the single-chip microcomputer into 24V output to the voltage regulation circuit module.

[0011] Preferably, the high-side drive module selects the BTS716 chip, and the four pins 3, 5, 7 and 9 thereof are connected with the output port of the single-chip microcomputer.

[0012] Preferably, the DCDC module converts the stable 24V input into the pins 1, 10, 11, 12, 20, 19, 16 and 15 of the BTS716 chip.

[0013] Preferably, the output pin of the high-side drive module outputs a single-channel output current of 2.6A in a rated state and a maximum output current of 6.5A.

[0014] Preferably, the output pins of the high-side drive circuit are each pulled down by a diode, and the diodes are respectively D1, D2, D3 and D4, so as to inhibit reverse current.

[0015] Preferably, the four input pins of the high-side drive module are each pulled down by a resistor, and the resistors are respectively R1, R2, R3 and R4; when the level output by the single-chip microcomputer is uncertain, the input pin of the high-side drive module is determined as a low level.

[0016] Preferably, the voltage regulation circuit is provided with resistors R5 and R6; the output voltage is changed by changing the resistance value of the resistors R5 and R6, so as to adapt to solenoid valves of different voltage platforms.

[0017] Compared with the prior art, the utility model has the following beneficial technical effects:

[0018] The utility model discloses an improved traditional solenoid valve control circuit, and the FCU power supply circuit module, the single-chip microcomputer, the high-side drive module and the voltage regulation circuit module are controlled, the resistance in the voltage regulation circuit module is adjusted, so that the solenoid valve of different voltage grades can be applied. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the system structure schematic drawing of control circuit in the utility model embodiment;

[0020] Figure 2 It is the wiring diagram of single-chip microcomputer in the utility model embodiment;

[0021] Figure 3 It is the wiring diagram of high-side drive module in the utility model embodiment;

[0022] Figure 4 It is the wiring diagram of voltage regulation circuit module in the utility model embodiment. DETAILED DESCRIPTION

[0023] Embodiment 1

[0024] As Figure 1 shown, the utility model provides a kind of hydrogen fuel stack inlet and outlet electromagnetic valve control circuit, including DCDC module, FCU power supply circuit module, single-chip microcontroller, high-side driver module, voltage regulating circuit module;

[0025] The output end of hydrogen fuel stack is connected with FCU power supply circuit module, single-chip microcontroller is connected with FCU power supply circuit module, and the voltage of 48V of hydrogen fuel stack output is to FCU power supply circuit module, is reduced to 5V by primary voltage reduction, is reduced to 3.3V by secondary voltage reduction finally and is output to single-chip microcontroller.

[0026] The input end of high-side driver module is connected with DCDC module, and the voltage output by stack is converted to 24V by DCDC module and is input as power supply for high-side driver module;The control end of high-side driver module is connected with four outputs of single-chip microcontroller, and the output end of high-side driver module is connected with four voltage regulating circuit modules respectively;

[0027] It is powered to electromagnetic valve by voltage regulating circuit module to adjust to suitable voltage, to adapt to electromagnetic valve of different voltage platform.

[0028] The following uses a specific case to introduce this scheme in detail:

[0029] As Figure 1 shown, it is system diagram of the electromagnetic valve control circuit of this embodiment, and it is composed of stack, DCDC module, FCU power supply circuit module, single-chip microcontroller, high-side driver module, voltage regulating circuit module;24V voltage of output stability is provided by stack and the DCDC module of unmanned aerial vehicle to power supply for high-side driver module;The control signal of high-side driver is provided by single-chip microcontroller, and the power supply of high-side driver is provided by special DCDC, and the DCDC converts 48V of stack into 24V, to power supply for high-side driver.

[0030] In this embodiment, STM32H723 chip is selected for single-chip microcontroller, and the control source of electromagnetic valve is the GPIO port of single-chip microcontroller, as Figure 2As shown, four pins PG4, PG5, PG6 and PG7 are selected to control the electromagnetic valve. The high-side drive module converts the output voltage of the single-chip microcomputer into 24V output to the voltage regulation circuit module. In the embodiment, the high-side drive module selects the BTS716 chip, and the 3, 5, 7 and 9 pins thereof are connected with the output port of the single-chip microcomputer. The four input pins of the high-side drive module are each pulled down by a resistor, and the other end of each resistor is grounded; when the level output by the single-chip microcomputer is uncertain, the pull-down resistor can ensure that the input pin of the high-side drive module is determined to be at low level; the DCDC module converts the stable 24V input into the 1, 10, 11, 12, 20, 19, 16 and 15 pins of the BTS716 chip. The output pin of the high-side drive module outputs a single-channel output current of 2.6A in rating and a maximum output current of 6.5A. The output pin of the high-side drive circuit is each pulled down by a diode, and the anode of each diode is grounded and the cathode is connected with the output pin; the selected diode is a freewheeling diode, which is used to suppress reverse current. When the output end is closed, the control object is an inductive coil, which will have a reverse current, so four freewheeling diodes are added here to play the role of freewheeling, which is safer.

[0031] In the embodiment, the voltage regulation circuit includes an LM2576S-ADJ chip (hereinafter referred to as U3 chip), and the wiring diagram thereof is as shown in Figure 4 The 1 pin of the U3 chip is connected with the output pin of the BTS716 high-side drive module; the 2 pin is an output pin, which is connected with the electromagnetic valve after being connected in series with an inductor L1; the input end of the U3 chip is pulled down by a filter capacitor C1; the 3, 5 and 6 pins are grounded; the 4 pin is connected with the first end of resistors R5 and R6; the second end of the resistor R5 is grounded, and the second end of the resistor R6 is connected with the output end; the anode of a diode D5 is grounded, and the cathode is connected with the input end of the inductor L1; one end of a capacitor C2 is connected with the output end of the inductor L1, and the other end is grounded; one end of a capacitor C3 is connected with the output end, and the other end is grounded;

[0032] In the embodiment, when the BTS716 outputs 24V, the U3, i.e., the LM2576S-ADJ, outputs a voltage U0=1.23V*(1+R6 / R5), where R6=8.7K and R5=1K, so U0=11.931V. If U0 needs to output other voltages, the specific resistance values of R6 and R5 can be modified.

[0033] For example, in the general design of the circuit, the general R5 range is selected as 1K-5K, and in the embodiment, R5 is 1K; the value of R6 can be dynamically adjusted during the design stage to achieve the size of U0 output. Generally, the size of U0 output voltage is determined according to the actual required voltage value of the electromagnetic valve. In this way, without changing the overall circuit, only by modifying the resistance value of one resistor, the purpose of adapting the electromagnetic valve of different voltage platforms by the driving circuit can be achieved; during the circuit design process, the R6 resistor can be directly replaced by a suitable resistance value, or a digital potentiometer can be used to control the internal switch to switch the resistance tap position, thereby achieving resistance value control; or a MOSFET linear region analog resistor and a switched capacitor equivalent resistor are used to dynamically adjust the resistance value.

[0034] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited thereto, and various changes can be made within the knowledge range possessed by the skilled in the art without departing from the purpose of the utility model.

Claims

1. A hydrogen fuel stack intake and exhaust solenoid valve control circuit, characterized by, The DCDC module, the FCU power circuit module, the single-chip microcomputer, the high-side drive module and the voltage regulation circuit module are included. The output end of the hydrogen fuel stack is connected with the FCU power circuit module, the single-chip microcomputer is connected with the FCU power circuit module, the hydrogen fuel stack outputs 48V voltage to the FCU power circuit module, and the voltage is reduced to 5V by one-step voltage reduction and then reduced to 3.3V by two-step voltage reduction and finally output to the single-chip microcomputer. The input end of the high-side drive module is connected with the DCDC module, the voltage output by the stack is converted and stabilized to 24V by the DCDC module as input to supply power for the high-side drive module; the control end of the high-side drive module is connected with four outputs of the single-chip microcomputer, and the output end of the high-side drive module is connected with four voltage regulation circuit modules. The electromagnetic valve is supplied with power by the voltage regulation circuit module to adapt to electromagnetic valves of different voltage platforms.

2. A hydrogen fuel stack intake and exhaust solenoid control circuit according to claim 1, wherein, The control source of the electromagnetic valve is the GPIO port of the single-chip microcomputer.

3. A hydrogen fuel cell stack inlet and exhaust solenoid valve control circuit according to claim 2 wherein, The single-chip microcomputer selects the STM32H723 chip, and selects four pins PG4, PG5, PG6 and PG7 to control the electromagnetic valve.

4. A hydrogen fuel cell stack intake and exhaust solenoid control circuit in accordance with claim 1 wherein, The high-side drive module converts the output voltage of the single-chip microcomputer to 24V and outputs to the voltage regulation circuit module.

5. A hydrogen fuel cell stack inlet and exhaust solenoid valve control circuit according to claim 4 wherein, The high-side drive module selects the BTS716 chip, and the four pins 3, 5, 7 and 9 thereof are connected with the output port of the single-chip microcomputer.

6. A hydrogen fuel cell stack inlet and exhaust solenoid valve control circuit according to claim 5 wherein, The 24V input converted and stabilized by the DCDC module is input to the pins 1, 10, 11, 12, 20, 19, 16 and 15 of the BTS716 chip.

7. A hydrogen fuel cell stack inlet and exhaust solenoid valve control circuit as defined in claim 5 wherein, The output pin of the high-side drive module outputs 2.6A rated current in single channel, and the maximum output current is 6.5A.

8. A hydrogen fuel cell stack inlet and exhaust solenoid valve control circuit according to claim 7 wherein, The output pins of the high-side drive circuit are each pulled down by a diode, which are D1, D2, D3 and D4 respectively, to inhibit reverse current.

9. A hydrogen fuel cell stack inlet and exhaust solenoid valve control circuit as defined in Claim 5 wherein, The four input pins of the high-side drive module are each pulled down by a resistor, which are R1, R2, R3 and R4 respectively; when the level output by the single-chip microcomputer is uncertain, the input pin of the high-side drive module is determined as low level.

10. A hydrogen fuel stack inlet and exhaust solenoid control circuit according to claim 1 wherein, The voltage regulation circuit sets resistors R5 and R6; the output voltage is changed by changing the resistance of the resistors R5 and R6 to adapt to electromagnetic valves of different voltage platforms.

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