Hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit and discharge method

Abstract

The present invention discloses a hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit and a discharge method thereof. The high-voltage auxiliary power supply, the first pre-charging circuit and the motor controller of the present invention are connected in series to form a closed circuit, the fuel-electric boost FCDC is connected in parallel at both ends of the high-voltage auxiliary power supply, and the step-down DCL is connected in parallel at both ends of the motor controller; the second pre-charging circuit, the fuel-electric air compressor controller and the high-voltage components are connected in series in sequence to form a branch, and the branch is connected in parallel at both ends of the high-voltage auxiliary power supply; the output end of the high-voltage auxiliary power supply is provided with a switch K4; the fuel-electric boost FCDC includes a fuel-electric boost capacitor, a diode and a discharge resistor, the fuel-electric boost capacitor and the diode are connected in series, and the discharge resistor is connected in parallel at both ends of the fuel-electric boost capacitor and the diode through a switch K5. The present invention uses the active discharge control circuit of the fuel-electric boost FCDC to help the fuel-electric air compressor controller and its high-voltage components complete active discharge, shortening the high-voltage discharge time of the supporting capacitor.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen energy vehicles, and in particular to a hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit and a discharge method thereof. Background Art

[0002] my country's fuel cell buses have completed commercial demonstration operations, and fuel cell passenger cars are also developing rapidly. Various performance indicators have basically met operational requirements and are beginning to move towards large-scale industrialization. However, for a new energy system to be promoted and applied, its safety should be the first concern. The fuel-electric boost FCDC in the existing technology does not have an active discharge function. When the fuel-electric air compressor controller and high-voltage components do not have an active discharge function, the power-off time of hydrogen energy vehicles is long, which poses certain safety hazards. Summary of the invention

[0003] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and to provide a hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit and a discharge method thereof with improved safety.

[0004] A hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit of the present invention comprises a high-voltage auxiliary power supply, a fuel-electric boost FCDC, a motor controller, a step-down DCL, a fuel-electric air compressor controller, a high-voltage component, a first pre-charging circuit and a second pre-charging circuit;

[0005] The motor controller is electrically connected to the vehicle drive motor, and the fuel-electric air compressor controller is electrically connected to the air compressor motor;

[0006] The high-voltage auxiliary power supply, the first pre-charging circuit and the motor controller are connected in series to form a closed circuit, the fuel-electric boost FCDC is connected in parallel at both ends of the high-voltage auxiliary power supply, and the step-down DCL is connected in parallel at both ends of the motor controller;

[0007] The second pre-charging circuit, the fuel-electric air compressor controller and the high-voltage component are sequentially connected in series to form a branch circuit, and the branch circuit is connected in parallel at both ends of the high-voltage auxiliary power supply;

[0008] The output end of the high voltage auxiliary power supply is provided with a switch K4;

[0009] The fuel-electric boost FCDC includes a fuel-electric boost capacitor, a diode and a discharge resistor. The fuel-electric boost capacitor and the diode are connected in series, and the discharge resistor is connected in parallel to both ends of the fuel-electric boost capacitor and the diode through a switch K5.

[0010] As described above, in the discharge method of the active discharge circuit of the boost FCDC of a hydrogen energy vehicle, when the fuel-electric air compressor and the high-voltage components do not have the active discharge function, the active discharge circuit at the output end of the fuel-electric boost FCDC is used to discharge, so that the fuel-electric air compressor controller and the high-voltage component support capacitor are discharged as soon as possible, and the fuel-electric boost FCDC itself is also discharged at the same time.

[0011] Furthermore, the specific implementation method is as follows:

[0012] When the high voltage of the whole vehicle is powered off, the switch K4 and the first pre-charging circuit are disconnected, and the motor controller starts to discharge by the function of active discharge. After the discharge is completed, the driving motor of the whole vehicle is powered off, and then the second pre-charging circuit and the switch K5 are closed. The fuel-electric air compressor controller and the fuel-electric boost FCDC are connected, and discharge starts through the discharge resistor of the fuel-electric boost FCDC. After the vehicle controller of the hydrogen energy vehicle monitors that the voltage between the positive and negative electrodes of the fuel-electric boost FCDC output is lower than the threshold, it is confirmed that the active discharge of the fuel-electric air compressor controller and the high-voltage components is completed, and the fuel-electric boost FCDC itself is also discharged at the same time, and the switch K5 is disconnected to complete the active discharge of the fuel-electric air compressor controller and the high-voltage components.

[0013] Furthermore, the first pre-charging circuit includes a switch K0, a switch K1 and a first pre-charging resistor R1, the switch K1 and the first pre-charging resistor R1 are connected in series in the closed circuit, and the switch K0 is connected in parallel at both ends of the switch K1 and the first pre-charging resistor R1; the second pre-charging circuit includes a switch K2, a switch K3 and a second pre-charging resistor R2, the switch K3 and the second pre-charging resistor R2 are connected in series on the branch, and the switch K2 is connected in parallel at both ends of the switch K3 and the second pre-charging resistor R2.

[0014] Furthermore, when the high voltage of the whole vehicle is powered off, the switch K4, the switch K1 and the switch K0 are disconnected, and the motor controller starts to discharge by the active discharge function. After the discharge is completed, the drive motor of the whole vehicle is powered off, and then the switch K2 and the switch K5 are closed, and the fuel-electric air compressor controller and the fuel-electric boost FCDC are connected, and discharge starts through the discharge resistor. After the vehicle controller of the hydrogen energy vehicle monitors that the voltage between the positive and negative electrodes of the fuel-electric boost FCDC output is lower than the threshold, it is confirmed that the active discharge of the fuel-electric air compressor controller and the high-voltage components is completed, and the fuel-electric boost FCDC itself is also discharged at the same time, and the switch K5 is disconnected to complete the active discharge of the fuel-electric air compressor controller and the high-voltage components.

[0015] In a hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit of the present invention, the discharge resistor is connected in parallel to the fuel-electric boost capacitor and the two ends of the diode through a switch K5, so that the fuel-electric boost FCDC has an active discharge function, and the active discharge control circuit of the fuel-electric boost FCDC is used to help the fuel-electric air compressor controller and its high-voltage components to complete active discharge. At the same time, the fuel-electric boost FCDC itself also completes active discharge at the same time, shortening the high-voltage discharge time of the support capacitor and improving the safety of the fuel-electric air compressor controller, the fuel-electric boost FCDC and the high-voltage components. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a structural schematic diagram of a hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit.

[0017] 1. High-voltage auxiliary power supply; 2. Fuel-electric boost FCDC; 3. Motor controller; 4. Step-down DCL; 5. Fuel-electric air compressor controller; 6. High-voltage components; 7. First pre-charging circuit; 8. Second pre-charging circuit; 9. Vehicle drive motor; 10. Air compressor motor; 11. Fuel-electric boost capacitor; 12. Diode; 13. Discharge resistor. DETAILED DESCRIPTION

[0018] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0019] like Figure 1 As shown, a hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit of the present invention comprises a high-voltage auxiliary power supply 1, a fuel-electric boost FCDC 2, a motor controller 3, a step-down DCL 4, a fuel-electric air compressor controller 5, a high-voltage component 6, a first pre-charging circuit 7 and a second pre-charging circuit 8;

[0020] The motor controller 3 is electrically connected to the vehicle drive motor 9, and the fuel-electric air compressor controller 5 is electrically connected to the air compressor motor 10;

[0021] The high-voltage auxiliary power supply 1, the first pre-charging circuit 7 and the motor controller 3 are connected in series to form a closed circuit, the fuel-electric boost FCDC2 is connected in parallel to both ends of the high-voltage auxiliary power supply 1, and the step-down DCL4 is connected in parallel to both ends of the motor controller 3;

[0022] The second pre-charging circuit 8, the gas-electric air compressor controller 5 and the high-voltage component 6 are sequentially connected in series to form a branch circuit, and the branch circuit is connected in parallel to both ends of the high-voltage auxiliary power supply 1;

[0023] A switch K4 is provided at the output end of the high voltage auxiliary power supply 1;

[0024] The fuel-electric boost FCDC2 includes a fuel-electric boost capacitor 11, a diode 12 and a discharge resistor 13. The fuel-electric boost capacitor 11 and the diode 12 are connected in series, and the discharge resistor 13 is connected in parallel to both ends of the fuel-electric boost capacitor 11 and the diode 12 through a switch K5.

[0025] In a hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit of the present invention, the discharge resistor 13 is connected in parallel to the fuel-electric boost capacitor 11 and the diode 12 through a switch K5, so that the fuel-electric boost FCDC2 has an active discharge function, and the active discharge control circuit of the fuel-electric boost FCDC2 is used to help the fuel-electric air compressor controller 5 and its high-voltage component 6 complete active discharge. At the same time, the fuel-electric boost FCDC2 itself also completes active discharge at the same time, shortening the high-voltage discharge time of the supporting capacitor, and improving the safety of the fuel-electric air compressor controller 5, the fuel-electric boost FCDC2 and the high-voltage component 6.

[0026] The switch K0 may include a first high voltage positive main positive relay or contactor.

[0027] The switch K1 may include a first high voltage pre-charge relay or contactor.

[0028] The switch K2 may include a second high voltage positive main positive relay or contactor.

[0029] Switch K3 may include a second high voltage pre-charge relay or contactor.

[0030] The function of the switch K5 is to control the high-voltage relay of the discharge circuit at the output end of the boost FCDC to be turned on or off.

[0031] The function of the switch K4 is to control the high voltage output of the high voltage auxiliary power supply 1 to be turned on or off.

[0032] The function of the step-down DCL4 is to convert the vehicle's DC high voltage into DC low voltage.

[0033] The function of the motor controller 3 is to control the speed and torque of the vehicle drive motor 9.

[0034] The function of the vehicle driving motor 9 is to drive the vehicle.

[0035] The function of the air compressor motor 10 is to increase the air pressure of the fuel cell and input it to the fuel cell stack.

[0036] The function of the gas-electric air compressor controller 5 is to control the speed, start and stop of the air compressor motor 10.

[0037] The function of the fuel cell boost FCDC2 is to boost the output voltage of the fuel cell and provide it to the whole vehicle. It has a directional diode 12 inside so no pre-charging is required at its output end.

[0038] High voltage component 6 refers to a high voltage component 6 or accessory having a supporting capacitor or other capacitor inside;

[0039] As mentioned above, in the discharge method of the active discharge circuit of the boost FCDC of a hydrogen energy vehicle, when the fuel-electric air compressor and the high-voltage component 6 do not have the active discharge function, the active discharge circuit at the output end of the fuel-electric boost FCDC2 is used to discharge, so that the fuel-electric air compressor controller 5 and the supporting capacitor of the high-voltage component 6 are discharged as soon as possible, and the fuel-electric boost FCDC2 itself is also discharged at the same time.

[0040] The specific implementation method is as follows:

[0041] When the high voltage of the whole vehicle is powered off, the switch K4 and the first pre-charging circuit 7 are disconnected, and the motor controller 3 starts to discharge by the active discharge function. After the discharge is completed, the driving motor 9 of the whole vehicle is powered off, and then the second pre-charging circuit 8 and the switch K5 are closed, and the fuel-electric air compressor controller 5 and the fuel-electric boost FCDC2 are connected, and discharge starts through the discharge resistor 13 of the fuel-electric boost FCDC2. After the vehicle controller of the hydrogen energy vehicle monitors that the voltage between the positive and negative electrodes of the fuel-electric boost FCDC2 output is lower than the threshold, it is confirmed that the active discharge of the fuel-electric air compressor controller 5 and the high-voltage component 6 is completed, and the fuel-electric boost FCDC2 itself is also discharged at the same time, and the switch K5 is disconnected to complete the active discharge of the fuel-electric air compressor controller 5 and the high-voltage component 6.

[0042] The first pre-charging circuit 7 includes a switch K0, a switch K1 and a first pre-charging resistor R1, the switch K1 and the first pre-charging resistor R1 are connected in series in a closed circuit, and the switch K0 is connected in parallel at both ends of the switch K1 and the first pre-charging resistor R1; the second pre-charging circuit 8 includes a switch K2, a switch K3 and a second pre-charging resistor R2, the switch K3 and the second pre-charging resistor R2 are connected in series on a branch, and the switch K2 is connected in parallel at both ends of the switch K3 and the second pre-charging resistor R2.

[0043] When the high voltage of the whole vehicle is powered off, the switches K4, K1 and K0 are disconnected, and the motor controller 3 starts to discharge by the active discharge function. After the discharge is completed, the drive motor 9 of the whole vehicle is powered off, and then the switches K2 and K5 are closed, the fuel-electric air compressor controller 5 and the fuel-electric boost FCDC2 are connected, and discharge starts through the discharge resistor 13. After the vehicle controller of the hydrogen energy vehicle monitors that the voltage between the positive and negative poles of the fuel-electric boost FCDC2 output is lower than the threshold, it is confirmed that the active discharge of the fuel-electric air compressor controller 5 and the high-voltage component 6 is completed, and the fuel-electric boost FCDC2 itself is also discharged at the same time, and the switch K5 is disconnected to complete the active discharge of the fuel-electric air compressor controller 5 and the high-voltage component 6.

[0044] For matters not mentioned above, the prior art applies.

[0045] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art to which the present invention belongs may make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but they will not deviate from the direction of the present invention or exceed the scope defined by the attached claims. Those skilled in the art should understand that any modifications, equivalent substitutions, improvements, etc. made to the above embodiments based on the technical essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A discharge method for a hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit, characterized in that: The hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit comprises a high-voltage auxiliary power supply (1), a fuel-electric boost FCDC (2), a motor controller (3), a step-down DCL (4), a fuel-electric air compressor controller (5), a high-voltage component (6), a first pre-charging circuit (7) and a second pre-charging circuit (8); The motor controller (3) is electrically connected to the vehicle drive motor (9), and the fuel-electric air compressor controller (5) is electrically connected to the air compressor motor (10); The high-voltage auxiliary power supply (1), the first pre-charging circuit (7) and the motor controller (3) are connected in series to form a closed circuit, the fuel-electric boost FCDC (2) is connected in parallel to both ends of the high-voltage auxiliary power supply (1), and the step-down DCL (4) is connected in parallel to both ends of the motor controller (3); The second pre-charging circuit (8), the fuel-electric air compressor controller (5) and the high-voltage component (6) are sequentially connected in series to form a branch circuit, and the branch circuit is connected in parallel to both ends of the high-voltage auxiliary power supply (1); A switch K4 is provided at the output end of the high-voltage auxiliary power supply (1); The fuel-electric boost FCDC (2) comprises a fuel-electric boost capacitor (11), a diode (12) and a discharge resistor (13), wherein the fuel-electric boost capacitor (11) and the diode (12) are connected in series, and the discharge resistor (13) is connected in parallel to both ends of the fuel-electric boost capacitor (11) and the diode (12) via a switch K5; The discharge method is: When the high voltage of the whole vehicle is powered off, the switch K4 and the first pre-charging circuit (7) are disconnected, the motor controller (3) starts to discharge by actively discharging, and the whole vehicle drive motor (9) is powered off after the discharge is completed, then the second pre-charging circuit (8) and the switch K5 are closed, the fuel-electric air compressor controller (5) and the fuel-electric boost FCDC (2) are connected, and discharge starts through the discharge resistor (13) of the fuel-electric boost FCDC (2). After the vehicle controller of the hydrogen energy vehicle monitors that the voltage between the positive and negative electrodes of the fuel-electric boost FCDC (2) output is lower than a threshold value, it is confirmed that the fuel-electric air compressor controller (5) and the high-voltage component (6) have completed active discharge, and the fuel-electric boost FCDC (2) itself has also completed discharge at the same time, and the switch K5 is disconnected to complete the active discharge of the fuel-electric air compressor controller (5) and the high-voltage component (6); The first pre-charging circuit (7) comprises a switch K0, a switch K1 and a first pre-charging resistor R1, wherein the switch K1 and the first pre-charging resistor R1 are connected in series in the closed circuit, and the switch K0 is connected in parallel at both ends of the switch K1 and the first pre-charging resistor R1; the second pre-charging circuit (8) comprises a switch K2, a switch K3 and a second pre-charging resistor R2, wherein the switch K3 and the second pre-charging resistor R2 are connected in series in the branch circuit, and the switch K2 is connected in parallel at both ends of the switch K3 and the second pre-charging resistor R2; When the high voltage of the whole vehicle is powered off, the switch K4, the switch K1 and the switch K0 are disconnected, the motor controller (3) starts to discharge by its active discharge function, and after the discharge is completed, the whole vehicle drive motor (9) is powered off, and then the switch K2 and the switch K5 are closed, the fuel-electric air compressor controller (5) and the fuel-electric boost FCDC (2) are connected, and discharge begins through the discharge resistor (13). After the whole vehicle controller of the hydrogen energy vehicle monitors that the voltage between the positive and negative electrodes of the fuel-electric boost FCDC (2) output is lower than a threshold value, it is confirmed that the fuel-electric air compressor controller (5) and the high-voltage component (6) have completed active discharge, and the fuel-electric boost FCDC (2) itself has also completed discharge at the same time, and the switch K5 is disconnected to complete the active discharge of the fuel-electric air compressor controller (5) and the high-voltage component (6).

2. The discharge method of the hydrogen energy vehicle fuel-electric boost FCDC active discharge circuit as claimed in claim 1, characterized in that: In the case where the gas-electric air compressor and the high-voltage component (6) do not have an active discharge function, the active discharge circuit at the output end of the gas-electric boost FCDC (2) performs discharge, so that the gas-electric air compressor controller (5) and the high-voltage component (6) supporting capacitors complete discharge as quickly as possible, and the gas-electric boost FCDC (2) itself also completes discharge at the same time.

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