Control circuit for electric sunshade curtain of automobile

Abstract

The utility model belongs to the technical field of automobile motor control, and discloses an automobile electric sunshade control circuit which comprises a power conversion module, a motor driving module and a signal processing module. The power conversion module is connected with the motor driving module and the signal processing module and provides power, the signal processing module receives a sunshade curtain lifting control request signal and outputs a control signal to the motor driving module, and the motor driving module controls a motor to work according to the control signal to complete lifting control of the sunshade curtain; the motor driving module comprises a discrete H-bridge driving circuit, and the discrete H-bridge driving circuit controls forward rotation or reverse rotation of a driving motor; the control circuit for the electric sunshade curtain of the automobile can adapt to a wider voltage range and a higher driving current, effectively solves the problems that an integrated bridge drive is small in driving current and narrow in working voltage range in a 24V system, improves the working reliability of a whole automobile load, and greatly improves the compatibility of sunshade curtain driving motor loads of different specifications at the same time.

Description

Technical Field

[0001] This application belongs to the technical field of automotive motor control, and specifically refers to an automotive electric sunshade control circuit. Background Art

[0002] In the vehicle field, most of the traditional bus sunshades control the opening of the sunshade by directly controlling the positive power supply of the motor using a mechanical switch. In this method, the instantaneous energy when the motor starts is absorbed by the mechanical switch contacts, which has the advantages of simple circuit and low cost. However, it also has the disadvantage of being not conducive to the functional expansion of vehicle networking.

[0003] With the development of new energy vehicle technology, the applications of electric sunshades and electric rearview mirrors are becoming more and more widespread. Currently, passenger cars mostly use integrated half-bridge or full-bridge solutions to drive small-power motors. However, there are many brands and types of electric sunshades for buses, with a wide range of parameters, and there are problems such as a wide voltage range and a large motor starting current. The integrated bridge drive solution can no longer fully cover buses or commercial vehicles with a 24V system. The small working current and narrow working voltage range of the integrated bridge drive solution have become the main bottlenecks of the integrated bridge drive solution. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, this application provides an automotive electric sunshade control circuit that can adapt to a wider voltage range and higher drive current.

[0005] The present utility model provides an automotive electric sunshade control circuit, which includes: a power conversion module, a motor drive module, and a signal processing module; the power conversion module is connected to the motor drive module and the signal processing module and provides power. The signal processing module receives the sunshade lifting control request signal and outputs a control signal to the motor drive module. The motor drive module controls the motor to work according to the control signal to complete the lifting control of the sunshade.

[0006] Among them, the motor drive module includes a discrete H-bridge drive circuit, and the discrete H-bridge drive circuit controls the forward or reverse rotation of the drive motor.

[0007] According to the automotive electric sunshade control circuit provided by this application, the power conversion module includes a logic power supply unit and a power supply unit;

[0008] Among them, the logic power supply unit is connected to the signal processing module, and the logic power supply unit provides a stable low-voltage level to the signal processing module; the power supply unit is connected to the motor drive module, and the power supply unit provides a power switch and reverse power supply protection to the motor drive module.

[0009] According to the automotive electric sunshade control circuit provided by the present application, the logic power supply unit includes a power management chip, a plurality of resistors, a plurality of capacitors, and a plurality of diodes. The plurality of resistors, the plurality of capacitors, and the plurality of diodes are all connected to the power management chip. The logic power supply unit converts and stabilizes the vehicle's 24V power supply to a voltage between 4.8V and 5.2V.

[0010] According to the automotive electric sunshade control circuit provided by the present application, the motor drive module further includes a gate driver and a resistor. The gate driver is connected to the resistor and the discrete H-bridge drive circuit, and the discrete H-bridge drive circuit drives the motor of an external load. The gate driver controls the on / off of the discrete H-bridge drive circuit to control the forward or reverse rotation of the motor of the external load.

[0011] According to the automotive electric sunshade control circuit provided by the present application, the discrete H-bridge drive circuit includes four mutually independent NMOS transistors, and the four mutually independent NMOS transistors are all connected to the motor. Two of the NMOS transistors form a first half-bridge, and are respectively the upper transistor and the lower transistor of the first half-bridge. The other two NMOS transistors form a second half-bridge, and are respectively the upper transistor and the lower transistor of the second half-bridge.

[0012] According to the automotive electric sunshade control circuit provided by the present application, when the working state of the discrete H-bridge drive circuit is stationary, the circuit output state of the first half-bridge is Hi-z, the circuit output state of the second half-bridge is Hi-z, and the motor is in a stationary state.

[0013] According to the automotive electric sunshade control circuit provided by the present application, when the working state of the discrete H-bridge drive circuit is forward rotation, the circuit output state of the first half-bridge is low level, the circuit output state of the second half-bridge is high level, and the motor is in a forward rotation state.

[0014] According to the automotive electric sunshade control circuit provided by the present application, when the working state of the discrete H-bridge drive circuit is reverse rotation, the circuit output state of the first half-bridge is high level, the circuit output state of the second half-bridge is low level, and the motor is in a reverse rotation state.

[0015] According to the automotive electric sunshade control circuit provided by the present application, when the working state of the discrete H-bridge drive circuit is in the braking mode, the circuit output state of the first half-bridge is low level, the circuit output state of the second half-bridge is low level, and the motor is in a deceleration state.

[0016] According to the automotive electric sunshade control circuit provided by the present application, the signal processing module includes an MCU single-chip microcomputer, a CAN transceiver, and a sunshade switch state acquisition unit; the CAN transceiver and the sunshade switch state acquisition unit are connected to the MCU single-chip microcomputer, and the MCU single-chip microcomputer is connected to the motor drive module;

[0017] Among them, the CAN transceiver communicates with the vehicle CAN, receives the sunshade control status request and outputs it to the MCU single-chip microcomputer; the sunshade switch state acquisition unit real-time collects the switch state information of the sunshade and outputs it to the MCU single-chip microcomputer; the MCU single-chip microcomputer controls the operation of the motor drive module according to the sunshade control status request and the switch state information of the sunshade.

[0018] The beneficial effects of the present utility model are as follows: The automotive electric sunshade control circuit provided by the present application includes a power conversion module, a motor drive module, and a signal processing module; the signal processing module receives the lifting action request of the electric sunshade, and after processing, outputs a control signal to the motor drive module, and the motor drive module controls the rotation of the motor according to the corresponding control signal to drive the sunshade to operate. A discrete H-bridge drive circuit is provided in the motor drive module, and the discrete H-bridge drive circuit directly drives the sunshade motor, which can adapt to a wider voltage range and higher drive current, effectively solving the bottleneck problems of small drive current and narrow operating voltage range of the integrated bridge drive in the 24V system, improving the reliability of the vehicle load operation, and at the same time greatly enhancing the compatibility with different specifications of sunshade drive motor loads. Description of the Drawings

[0019] The following combines the drawings and details the specific implementation manners of the present application, making the technical solutions and other beneficial effects of the present application obvious.

[0020] Figure 1 It is the structural block diagram of the automotive electric sunshade control circuit provided for this embodiment.

[0021] Figure 2 It is the schematic diagram of the logic power supply unit circuit structure provided for this embodiment.

[0022] Figure 3 It is the schematic diagram of the circuit structure of the motor drive module provided for this embodiment.

[0023] Figure 4 It is the schematic diagram of the circuit structure of the CAN transceiver provided for this embodiment.

[0024] Figure 5 It is the schematic diagram of the circuit structure of the local switch device provided for this embodiment.

[0025] Figure 6Another schematic diagram of the automotive electric sunshade control circuit provided by this embodiment.

[0026] The reference numerals of each component in the figure are as follows: power conversion module 10, signal processing module 20, motor drive module 30, power management chip U1, and gate driver U3. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0029] The following disclosure provides many different implementation manners or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various implementation manners and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0030] In the prior art, automotive electric sunshades all use integrated half-bridge or full-bridge solutions, mainly for driving low-power motors. However, the integrated half-bridge or full-bridge solutions have problems such as a wide voltage range and a large motor starting current. The integrated bridge drive solution can no longer fully cover buses or commercial vehicles with a 24V system. The small working current and narrow working voltage range have become the main bottlenecks of the integrated bridge drive solution. Therefore, this application provides an automotive electric sunshade control circuit that can adapt to a wider voltage range and higher drive current, effectively solving the bottleneck problems of small drive current and narrow working voltage range of the integrated bridge drive in the 24V system.

[0031] Figure 1 The structural block diagram of the automotive electric sunshade control circuit provided in this embodiment.

[0032] As Figure 1 shown, the automotive electric sunshade control circuit includes: a power conversion module 10, a motor drive module 30, and a signal processing module 20; the power conversion module 10 is connected to the motor drive module 30 and the signal processing module 20 and provides power. The signal processing module 20 receives the sunshade lifting control request signal and outputs a control signal to the motor drive module 30. The motor drive module 30 controls the motor of the external load to work according to the control signal to complete the lifting control of the sunshade; wherein, the motor drive module 30 includes a discrete H-bridge drive circuit, and the discrete H-bridge drive circuit controls the forward or reverse rotation of the drive motor.

[0033] Specifically, the power conversion module 10 is composed of a logic power supply unit and a power supply unit. Among them, the logic power supply unit is connected to the signal processing module 20, and the logic power supply unit provides a stable low-voltage level for the signal processing module 20; the logic power supply unit can process the 24V power supply provided by the vehicle to obtain a stable voltage of 4.8V to 5.2V, so as to provide a stable low-voltage level for the logic processing unit in the signal processing module 20. The power supply unit is connected to the motor drive module 30, and the power supply unit provides a power switch and anti-power reverse connection protection for the motor drive module 30. The power supply unit can provide a power switch and anti-power reverse connection protection for the power devices in the subsequent circuit, so as to improve the electromagnetic compatibility performance of the system.

[0034] Figure 2 The schematic circuit diagram of the logic power supply unit provided in this embodiment.

[0035] As Figure 2As shown, the logic power supply unit includes a power management chip U1, multiple resistors, multiple capacitors, and multiple diodes. The multiple resistors, the multiple capacitors, and the multiple diodes are all connected to the power management chip U1. The logic power supply unit converts and stabilizes the vehicle's 24V power supply to a voltage between 4.8V and 5.2V. Specifically, the pre-stage circuit of the power management chip U1 is connected to the vehicle's 24V power supply. The pre-stage circuit of the power management chip U1 includes several resistors, several capacitors, and several diodes to form a filtering circuit, which filters the power supply connected to the power management chip U1 to filter out transient clutter and stabilize the electrical level in the circuit. The post-stage circuit of the power management chip U1 includes several capacitors. The post-stage circuit of the power management chip U1 outputs a low voltage between 4.8V and 5.2V after being processed by the power management chip U1. The specific value of the low voltage can be set according to the low voltage required in the post-stage circuit.

[0036] Figure 3 It is a schematic circuit diagram of the motor drive module 30 provided in this embodiment.

[0037] The logic power supply unit mainly provides a low voltage to the signal processing module 20, while the power power supply unit mainly provides power to the motor drive module 30. As Figure 3 shown, in this embodiment, the motor drive module 30 further includes a gate driver U3 and a resistor; the gate driver U3 is connected to the resistor and the discrete H-bridge drive circuit, and the discrete H-bridge drive circuit is connected to the motor of the external load; the gate driver U3 controls the on / off of the discrete H-bridge drive circuit to control the forward or reverse rotation of the motor of the external load, and the motor of the external load drives the sunshade to rise and fall.

[0038] Specifically, the discrete H-bridge drive circuit includes four mutually independent NMOS transistors, and the four mutually independent NMOS transistors are all connected to the motor; two of the NMOS transistors form a first half-bridge, and are respectively the upper transistor and the lower transistor of the first half-bridge; the other two NMOS transistors form a second half-bridge, and are respectively the upper transistor and the lower transistor of the second half-bridge. The motor drive module 30 controls the on / off of the four mutually independent NMOS transistors in the discrete H-bridge drive circuit in a time-sharing manner to control the rotation of the motor. Among them, when the upper transistor of the first half-bridge is turned on and the lower transistor of the first half-bridge is turned off at the same time, the positive pole of the power supply can be provided for the motor. When the upper transistor of the second half-bridge is turned off and the lower transistor of the second half-bridge is turned on at the same time, the negative pole of the power supply can be provided for the motor. In this way, a positive current path will be formed at both ends of the motor, forming the action of the motor rotating forward.

[0039] In this embodiment, the motor drive module 30 controls the conduction timing of four mutually independent NMOS transistors, and the discrete H-bridge drive circuit can have the following four working modes:

[0040] When the working state of the discrete H-bridge drive circuit is stationary, the circuit output state of the first half-bridge is Hi-z, the circuit output state of the second half-bridge is Hi-z, and the motor is in a stationary state.

[0041] When the working state of the discrete H-bridge drive circuit is forward rotation, the circuit output state of the first half-bridge is low level, the circuit output state of the second half-bridge is high level, and the motor is in a forward rotation state.

[0042] When the working state of the discrete H-bridge drive circuit is reverse rotation, the circuit output state of the first half-bridge is high level, the circuit output state of the second half-bridge is low level, and the motor is in a reverse rotation state.

[0043] When the working state of the discrete H-bridge drive circuit is in the braking mode, the circuit output state of the first half-bridge is low level, the circuit output state of the second half-bridge is low level, and the motor is in a deceleration state.

[0044] Control the conduction timing of different NMOS transistors of the discrete H-bridge drive circuit to respectively control the steering of the motor, thereby driving the sunshade to perform lifting actions.

[0045] Figure 4 It is a schematic circuit diagram of the CAN transceiver provided in this embodiment. Figure 5 It is a schematic circuit diagram of the local switch device provided in this embodiment.

[0046] As Figure 4 、 Figure 5 shown, in this embodiment, the signal processing module 20 includes an MCU single-chip microcomputer, a CAN transceiver, and a sunshade switch state acquisition unit; the CAN transceiver and the sunshade switch state acquisition unit are connected to the MCU single-chip microcomputer, and the MCU single-chip microcomputer is connected to the motor drive module 30;

[0047] Among them, the CAN transceiver communicates with the vehicle CAN, receives the sunshade control state request and outputs it to the MCU single-chip microcomputer; the sunshade switch state acquisition unit real-time acquires the switch state information of the sunshade and outputs it to the MCU single-chip microcomputer; the MCU single-chip microcomputer controls the operation of the motor drive module 30 according to the sunshade control state request and the switch state information of the sunshade.

[0048] Figure 6 It is another schematic diagram of the automotive electric sunshade control circuit provided in this embodiment.

[0049] Specifically, the CAN transceiver communicates with the vehicle CAN. The CAN transceiver transmits information such as the motor load control request or the motor load working state. The sunshade switch state acquisition unit may further include a local switch device or a remote switch device. The local switch device includes a hardwired switch or a touch screen. The remote switch device can obtain the action request of the sunshade through network communication with the vehicle CAN via a mobile terminal. The user can realize the lifting request of the sunshade through the local switch device. The local switch device converts the operation intention of the user into a level signal. After the MCU single-chip microcomputer acquires the switch state of the local switch device, it controls the working mode of the discrete H-bridge drive circuit by controlling the gate of the discrete H-bridge drive circuit, so as to control the forward or reverse rotation of the motor, thereby driving the sunshade mechanism to realize the lifting action of the sunshade. The user can also send a lifting request for the sunshade through a mobile terminal. The mobile terminal communicates with the vehicle CAN through a mobile network. The vehicle CAN sends the lifting request information of the sunshade to the MCU single-chip microcomputer. The MCU single-chip microcomputer controls the forward or reverse rotation of the motor according to the received information, thereby driving the sunshade mechanism to realize the lifting action of the sunshade.

[0050] The switch states collected by the MCU single-chip microcomputer from the sunshade switch state acquisition unit include: collecting the divided voltage level of the hardware circuit of the local switch device through the MCU single-chip microcomputer; or parsing the CAN bus message instruction through the MCU single-chip microcomputer, and this message instruction can come from a remote control lifting command; or a control message generated by the vehicle touch screen.

[0051] In this embodiment, the lifting switch signal of the vehicle sunshade is transmitted through the vehicle's CAN bus, received by the CAN transceiver in the signal processing module 20, and then parsed by the MCU single-chip microcomputer to identify the lifting action request of the sunshade. The lifting switch signal of the sunshade can also be a network signal generated by the remote sunshade lifting control issued by a mobile terminal, forwarded to the vehicle's CAN bus by the vehicle gateway, and then sent by the CAN bus to the CAN transceiver, and parsed by the MCU single-chip microcomputer to identify the lifting action request of the sunshade. When the MCU single-chip microcomputer determines that the vehicle voltage meets the motor load control condition and receives the action request of the sunshade, it controls the corresponding IO port of the motor drive module 30 to output high / low level, thereby controlling the gate driver U3 to enter the forward / reverse working mode. Correspondingly, the discrete H-bridge drive circuit starts to be connected in an orderly manner, allowing the sunshade motor to pass forward / reverse current, thereby driving the rotor mechanism of the sunshade to rotate and realizing the lifting control of the sunshade.

[0052] Specifically, in this embodiment, the SO pin of the gate driver U3 can feedback the voltage drop across the sampling resistor. The MCU single-chip microcomputer calculates the working current of the motor load by reading the voltage of this pin, and then sets a reasonable current threshold through relevant software to perform turn-off protection on the circuit. When the chip has over-temperature or over-voltage abnormalities, the FAULT pin of the gate driver U3 can actively give a fault feedback; and the EN pin of the gate driver U3 can re-enable the chip to work, or can turn off the chip in the power-saving mode. In this embodiment, this self-diagnosis mode can realize real-time monitoring of the operation of the motor load, and feedback fault information through the CAN line, improving the safety of the product, enhancing the vehicle intelligence level, and improving the user's perception quality. Therefore, the gate driver U3 provided in this embodiment integrates over-temperature protection and over-voltage protection functions, which can prevent damage to the chip caused by instantaneous impact. Its current diagnosis function forms an over-current feedback signal by sampling and comparing the voltage difference of the sampling resistor in the load loop, and is read back by the single-chip microcomputer and then transmitted to the vehicle CAN bus, enabling the vehicle to realize real-time monitoring of the load operation state.

[0053] The automotive electric sunshade control circuit provided by this application includes a power conversion module 10, a motor drive module 30, and a signal processing module 20; the signal processing module 20 receives the lifting action request of the electric sunshade, and after processing, outputs a control signal to the motor drive module 30. The motor drive module 30 controls the rotation of the motor according to the corresponding control signal to drive the sunshade to operate. A discrete H-bridge drive circuit is provided in the motor drive module 30. The discrete H-bridge drive circuit directly drives the sunshade motor, which can adapt to a wider voltage range and higher drive current, effectively solving the bottleneck problems of small drive current and narrow working voltage range of the integrated bridge drive in the 24V system, improving the reliability of the vehicle load operation, and greatly enhancing the compatibility with different specifications of sunshade drive motor loads.

[0054] Although the preferred embodiments of the embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the embodiments of the present utility model. Finally, it should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or terminal device comprising the said element.

[0055] The above has introduced in detail a control circuit for an automotive electric sunshade provided by an embodiment of the present application. Specific examples are used in this text to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An automotive electric sunshade control circuit, characterized in that, The automotive electric sunshade control circuit includes: a power conversion module, a motor drive module, and a signal processing module; the power conversion module is connected to the motor drive module and the signal processing module and provides power. The signal processing module receives a sunshade lifting control request signal and outputs a control signal to the motor drive module. The motor drive module controls the motor to work according to the control signal to complete the lifting control of the sunshade. Among them, the motor drive module includes a discrete H-bridge drive circuit, and the discrete H-bridge drive circuit controls the forward or reverse rotation of the drive motor.

2. The automotive electric sunshade control circuit according to claim 1, wherein The power conversion module includes a logic power supply unit and a power supply unit. Among them, the logic power supply unit is connected to the signal processing module, and the logic power supply unit provides a stable low-voltage level to the signal processing module; the power supply unit is connected to the motor drive module, and the power supply unit provides a power switch and reverse power connection protection to the motor drive module.

3. The automotive electric sunshade control circuit according to claim 2, wherein The logic power supply unit includes a power management chip, a plurality of resistors, a plurality of capacitors, and a plurality of diodes. The plurality of resistors, the plurality of capacitors, and the plurality of diodes are all connected to the power management chip. The logic power supply unit converts and stabilizes the vehicle's 24V power supply to between 4.8V and 5.2V.

4. The automotive electric sunshade control circuit according to claim 1, characterized in that, The motor drive module further includes a gate driver and a resistor; the gate driver is connected to the resistor and the discrete H-bridge drive circuit, and the discrete H-bridge drive circuit drives the motor of an external load; the gate driver controls the on / off of the discrete H-bridge drive circuit to control the forward or reverse rotation of the motor of the external load.

5. The automotive electric sunshade control circuit according to claim 4, wherein The discrete H-bridge drive circuit includes four independent NMOS transistors, and all four independent NMOS transistors are connected to the motor; two of the NMOS transistors form a first half-bridge, and are respectively the upper transistor and the lower transistor of the first half-bridge; the other two NMOS transistors form a second half-bridge, and are respectively the upper transistor and the lower transistor of the second half-bridge.

6. The automotive electric sunshade control circuit according to claim 5, characterized in that, When the working state of the discrete H-bridge drive circuit is stationary, the circuit output state of the first half-bridge is Hi-z, the circuit output state of the second half-bridge is Hi-z, and the motor is in a stationary state.

7. The automotive electric sunshade control circuit according to claim 6, characterized in that, When the working state of the discrete H-bridge drive circuit is forward rotation, the circuit output state of the first half-bridge is low level, the circuit output state of the second half-bridge is high level, and the motor is in a forward rotation state.

8. The automotive electric sunshade control circuit according to claim 7, characterized in that, When the working state of the discrete H-bridge drive circuit is reverse rotation, the circuit output state of the first half-bridge is high level, the circuit output state of the second half-bridge is low level, and the motor is in a reverse rotation state.

9. The automotive electric sunshade control circuit according to claim 8, wherein, When the working state of the discrete H-bridge drive circuit is in the braking mode, the circuit output state of the first half-bridge is low level, the circuit output state of the second half-bridge is low level, and the motor is in a deceleration state.

10. The automotive electric sunshade control circuit according to claim 1, characterized in that, The signal processing module includes an MCU single-chip microcomputer, a CAN transceiver, and a sunshade switch state acquisition unit; the CAN transceiver and the sunshade switch state acquisition unit are connected to the MCU single-chip microcomputer, and the MCU single-chip microcomputer is connected to the motor drive module; Among them, the CAN transceiver communicates with the vehicle CAN, receives the sunshade control status request and outputs it to the MCU single-chip microcomputer; the sunshade switch state acquisition unit collects the switch state information of the sunshade in real time and outputs it to the MCU single-chip microcomputer; the MCU single-chip microcomputer controls the motor drive module to work according to the sunshade control status request and the switch state information of the sunshade.

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