Power-off anti-reverse control circuit, motor control circuit, module, system and vehicle

Abstract

The utility model relates to the technical field of vehicle circuit control, in particular to a power failure anti-reverse control circuit, a motor control circuit, a module, a system and a vehicle. Wherein a connector is connected with a power supply; the positive electrode of the diode D1 is connected with the connector, and the negative electrode of the diode D1 is connected with the direct-current motor control circuit; the bleeder tube Q1 is connected with the diode D1 in parallel, the pre-driver is connected with a direct current motor control circuit H bridge, the pre-driver is provided with a charge pump CP, and the charge pump is connected with a base electrode of the bleeder tube Q1 / a negative electrode of the diode D1 and used for controlling the bleeder tube Q1 to discharge reverse electromotive force at the two ends of the diode D1. According to the power-off anti-reverse control circuit provided by the utility model, under the condition that an energy storage capacitor is not adopted, reverse high-voltage electromotive force is discharged by additionally arranging a discharge channel, so that the safety of other elements of the whole control circuit board is ensured.

Description

Technical Field

[0001] This utility model relates to the field of vehicle circuit control technology, and in particular to a power failure anti-reverse control circuit, a motor control circuit, a module, a system, and a vehicle. Background Technology

[0002] The existing tailgate control module (PLG) does not activate its self-protection function when assembled and disconnected from power. When the tailgate is rapidly closed by external force, a high back electromotive force is generated, which can damage the body diode inside the MOSFET on the tailgate control module's main board. Specifically:

[0003] In vehicle control systems, the H-bridge circuit is a typical DC motor control circuit, commonly used for motor driving. An H-bridge consists of two groups of four bridge arms, with the motor connected between the two groups. The motor's forward and reverse rotation is achieved by controlling the conduction of the four bridge arms through a pre-drive. The four bridge arms correspond to four MOSFETs. However, the motor is an inductive load, so it is prone to sudden reverse loads when switching off or on. In a 12V vehicle system, the back electromotive force generated by the motor is measured to be approximately 40 volts. Such a high back electromotive force, if not properly discharged, can easily damage the components on the board. Utility Model Content

[0004] This invention aims to at least improve one of the technical problems existing in the prior art. To this end, this invention proposes a power failure anti-reverse control circuit, a motor control circuit, a module, a system, and a vehicle.

[0005] According to a first aspect of the present invention, a power-off anti-reverse control circuit is applied to a DC motor control circuit, comprising:

[0006] Connector, for connection to the power supply;

[0007] Diode D1, its positive terminal is connected to the connector, and its negative terminal is connected to the DC motor control circuit;

[0008] The bleeder Q1 is connected in parallel with the diode D1.

[0009] A pre-driver is connected to the DC motor control circuit, wherein the pre-driver has a charge pump connected to the base of the discharge tube Q1 and the cathode of the diode D1, for controlling the discharge tube Q1 to discharge the reverse electromotive force across the diode D1.

[0010] In one possible technical solution, the switching element is further defined as a switching diode, which can complete the switching on and off within nanoseconds, making it suitable for high-frequency applications. In addition, it can withstand high reverse voltage and prevent breakdown.

[0011] In one possible technical solution, the discharge tube Q1 is further configured as a MOSFET, with its emitter connected to the anode of the diode D1 and its collector connected to the cathode of the diode D1. By controlling the conduction of the discharge tube Q1 to discharge the reverse electromotive force across the diode D1, the diode D1 is protected to operate normally.

[0012] In one possible technical solution, a discharge circuit is further included, which includes a discharge resistor connected to the connector and grounded to safely discharge the reverse electromotive force.

[0013] In one possible technical solution, an isolation circuit is further included, the isolation circuit including an optocoupler isolator connected between the discharge circuit and the connector to ensure line safety.

[0014] According to the power-off anti-reverse control circuit of this utility model embodiment, without using an energy storage capacitor, the reverse high voltage electromotive force is discharged through an alternative discharge channel to ensure the safety of other components on the entire control circuit board.

[0015] According to the second aspect embodiment of the present invention, the motor control circuit adopts the above-mentioned power failure anti-reverse control circuit, wherein the motor control circuit includes an H-bridge drive circuit, which consists of four bridge arms. Every two bridge arms form a group of drive circuits. Each group of drive circuits is connected to the diode D1 and the pre-driver respectively to realize the forward or reverse rotation of the motor.

[0016] In one possible technical solution, each set of driving circuits further includes an upper bridge arm and a lower bridge arm with the same structure connected together. The upper bridge arm includes a MOSFET and a freewheeling diode to provide a current path during switching and prevent voltage spikes from damaging the switching elements.

[0017] According to a third aspect embodiment of the present invention, a motor power failure anti-reverse control module includes a control circuit as described above for motor power failure anti-reverse control.

[0018] According to a fourth aspect of the present invention, a motor power failure prevention and control system includes a motor power failure prevention and control module as described above, used for motor power failure prevention and control.

[0019] According to a fifth aspect embodiment of the present invention, a vehicle is equipped with a motor power failure prevention and control system as described above, used for motor power failure prevention and control.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a circuit diagram of the power-off anti-reverse control according to an embodiment of the present utility model. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. It should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0024] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] The terms "first," "second," "third," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, it may include a series of steps or units, or optionally, steps or units not listed, or other steps or units inherent to these processes, methods, products, or devices.

[0027] The accompanying drawings show only the portions relevant to this application, not all of them. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe operations (or steps) as sequential processes, many of these operations may be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operation is completed, but may also have additional steps not included in the drawings. The process may correspond to a method, function, procedure, subroutine, subprogram, etc.

[0028] The terms “component,” “module,” “system,” “unit,” etc., used in this specification are used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a unit can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, a thread of execution, a program, and / or distributed between two or more computers. Furthermore, these units can be executed from various computer-readable media on which various data structures are stored. Units can communicate, for example, via local and / or remote processes based on signals having one or more data packets (e.g., data from a second unit interacting with another unit between a local system, a distributed system, and / or a network; for example, the Internet interacting with other systems via signals).

[0029] Example 1

[0030] like Figure 1 As shown, a power-off anti-reverse control circuit according to a first aspect embodiment of the present invention is applied to a DC motor control circuit, comprising:

[0031] The CONNECT connector connects to the power supply.

[0032] Diode D1, its positive terminal is connected to the connector CONNECT, and its negative terminal is connected to the DC motor control circuit;

[0033] The bleeder Q1 is connected in parallel with the diode D1.

[0034] A pre-driver is connected to the DC motor control circuit. The pre-driver has a charge pump CP, which is connected to the base of the discharge tube Q1 and the cathode of the diode D1. The charge pump CP is used to control the discharge tube Q1 to discharge the reverse electromotive force across the diode D1.

[0035] It should be noted that the MOSFETs in each bridge arm are voltage-controlled switches, which are suitable for high-frequency applications.

[0036] It should be noted that the discharge tube Q1 is a MOSFET, with its emitter connected to the positive terminal of the diode D1 and its collector connected to the negative terminal of the diode D1. By controlling the conduction of the discharge tube Q1, the reverse electromotive force across the diode D1 is discharged, thereby protecting the diode D1 to operate normally.

[0037] The working principle of this embodiment is as follows: When the tailgate control module controller is powered on normally, the power supply enters the controller board through the connector, then passes through diode D1 and enters the H-bridge drive circuit. At this time, the discharge tube Q1 is in a closed and non-working state because the base level is lower than the emitter level. When the controller is not powered on, the motor is quickly shut off, and the reverse electromotive force generated by its reverse drive passes through the body diode inside the H-bridge and blocks the negative terminal of diode D1. At the same time, the reverse electromotive force is connected to the charge pump of the pre-driver. The high level generated by the charge pump opens the discharge tube Q1 and discharges the reverse electromotive force blocked in diode D1 to the outside of the controller board through the connector, avoiding damage to the components on the controller board.

[0038] In this embodiment, the power failure anti-reverse control circuit may further include a discharge circuit, which is connected to the connector and is used to safely discharge the reverse electromotive force.

[0039] It is worth mentioning that, in this embodiment, the power failure anti-reverse control circuit may further include an isolation circuit, which is installed between the discharge circuit and the connector to ensure line safety.

[0040] According to the power-off anti-reverse control circuit of this utility model embodiment, without using an energy storage capacitor, the reverse high voltage electromotive force is discharged through an alternative discharge channel to ensure the safety of other components on the entire control circuit board. This overcomes the previous requirement that the ECU needs to be powered on again to eliminate the reverse electromotive force generated by the motor reverse drag, and improves the service life of the components.

[0041] Based on the power failure anti-reverse control circuit of this embodiment, there is no need to consider the matching and selection of energy storage capacitors in terms of design. In addition, the tailgate control module installed on the production line can also quickly close the tailgate when the battery is disconnected, without worrying about the reverse electromotive force damaging the circuit board.

[0042] Example 2

[0043] This embodiment provides a motor control circuit that uses the above-mentioned power failure anti-reverse control circuit. The motor control circuit includes an H-bridge drive circuit H1, which consists of four bridge arms. Every two bridge arms form a group of drive circuits. Each group of drive circuits is connected to the diode D1 and the pre-driver, respectively. The forward and reverse motor M is connected between the two groups of drive circuits. The forward and reverse rotation of the forward and reverse motor M is realized through the H-bridge drive circuit H1.

[0044] It should be noted that the driving circuit includes upper bridge arms Q2 / Q3 and lower bridge arms Q4 / Q5, wherein each bridge arm includes a MOSFET and a freewheeling diode.

[0045] The upper bridge arm Q2 and the lower bridge arm Q5 are a pair to realize the forward rotation of the DC motor. An inverter A1 is connected between the upper bridge arm Q2 and the lower bridge arm Q5 to generate complementary control signals to ensure that the two diagonally opposite MOSFETs in the H-bridge can be turned on and off alternately, thereby controlling the direction of the current and the forward rotation of the motor.

[0046] The upper bridge arm Q3 and the lower bridge arm Q4 are paired to achieve DC motor reversal. An inverter A2 is connected between the upper bridge arm Q3 and the lower bridge arm Q4 to generate complementary control signals to ensure that the two diagonally opposite MOSFETs in the H-bridge can be turned on and off alternately, thereby controlling the direction of current and the reversal of the motor.

[0047] Example 3

[0048] This embodiment provides a motor power failure anti-reverse control module, which includes:

[0049] The CONNECT connector connects to the power supply.

[0050] Diode D1, its positive terminal is connected to the connector CONNECT, and its negative terminal is connected to the DC motor control circuit;

[0051] The bleeder Q1 is connected in parallel with the diode D1.

[0052] The motor control circuit includes:

[0053] Forward and reverse motor M;

[0054] The H-bridge drive circuit H1 consists of four bridge arms, with each pair of bridge arms forming a drive circuit. The forward and reverse motor M is connected between the two drive circuits, and the forward and reverse rotation of the forward and reverse motor M is achieved through the H-bridge drive circuit H1.

[0055] A pre-driver is connected to the DC motor control circuit. The pre-driver has a charge pump CP, which is connected to the base of the discharge tube Q1 and the cathode of the diode D1. The charge pump CP is used to control the discharge tube Q1 to discharge the reverse electromotive force across the diode D1.

[0056] A discharge circuit, comprising a discharge resistor, is connected to the connector and grounded to safely discharge the reverse electromotive force.

[0057] An isolation circuit, comprising an optocoupler isolator connected between the discharge circuit and the connector, is used to ensure line safety.

[0058] Example 4

[0059] This embodiment provides a motor power failure prevention and control system, which includes the motor power failure prevention and control module as described above, used for preventing and controlling motor power failure. The motor power failure prevention and control system in this embodiment can be a device, or a component, integrated circuit, or chip in a terminal. The device can be a mobile electronic device or a non-mobile electronic device; this embodiment does not specifically limit its functionality.

[0060] The motor power failure anti-reverse control system provided in this application embodiment can realize the power failure anti-reverse control circuit of Embodiment 1. To avoid repetition, it will not be described again here.

[0061] According to the motor power failure anti-reverse control system of this utility model embodiment, the reverse high voltage electromotive force can be discharged through an alternative discharge channel without the use of energy storage capacitor, so as to ensure the safety of other components on the entire control circuit board. This overcomes the previous requirement that the ECU needs to be powered on again to eliminate the reverse electromotive force generated by the motor reverse drag, and improves the service life of the components.

[0062] Example 5

[0063] This embodiment provides a vehicle equipped with a motor power failure prevention and control system as described above, used for motor power failure prevention and control.

[0064] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0066] Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily indicate the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0067] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A power-off anti-reverse control circuit, characterized in that, Applications in motor control circuits include: Connectors; Diode D1 connects the connector and the motor control circuit; The bleeder Q1 is connected in parallel with the diode D1. A pre-driver is connected to the motor control circuit. The pre-driver has a charge pump connected to the base of the discharge tube Q1 and the cathode of the diode D1, respectively, for controlling the discharge tube Q1 to discharge the reverse electromotive force across the diode D1.

2. The power failure anti-reverse control circuit according to claim 1, characterized in that, The discharge tube Q1 is a MOSFET and is connected in parallel with the diode D1.

3. The power failure anti-reverse control circuit according to claim 1, characterized in that, It also includes a discharge circuit, which includes a discharge resistor that is connected to the connector and then grounded.

4. The power failure anti-reverse control circuit according to claim 3, characterized in that, It also includes an isolation circuit, which includes an optocoupler isolator connected between the discharge circuit and the connector.

5. A motor control circuit employing the power failure anti-reverse control circuit as described in any one of claims 1 to 4, characterized in that, The motor control circuit includes an H-bridge drive circuit, which consists of four bridge arms, with each pair of bridge arms forming a drive circuit. Each set of drive circuits is connected to the diode D1 and the pre-driver respectively to realize the forward or reverse rotation of the motor.

6. The motor control circuit according to claim 5, characterized in that, Each set of drive circuits includes upper and lower bridge arm connections with identical structures.

7. A motor power failure anti-reverse control module, characterized in that, The control circuit described in any one of claims 1 to 4 includes the motor power-off anti-reverse control.

8. A motor power failure anti-reverse control system, characterized in that, It includes the motor power failure anti-reverse control module as described in claim 7, used for motor power failure anti-reverse control.

9. A vehicle, characterized in that, The vehicle is equipped with a motor power failure prevention and control system as described in claim 8, used for motor power failure prevention and control.

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