H-bridge driving circuit, H-bridge module and electronic equipment

Abstract

The utility model provides an H-bridge driving circuit, an H-bridge module and electronic equipment, and belongs to the technical field of H-bridge driving, and the H-bridge driving circuit comprises a current detection circuit which is connected with the output end of the H-bridge circuit and a motor driven by the H-bridge circuit in series so as to detect the phase current of the motor and output a current detection signal; the controller is connected with the current detection circuit and responds to the current detection signal to output a first control signal and a second control signal; the first driving circuit is connected with the controller and a P-type tube in the H-bridge circuit, and responds to the first control signal to control the on-off of the P-type tube; and the second driving circuit is connected with the controller and an N-type tube in the H-bridge circuit, and responds to the second control signal to control the on-off of the N-type tube. Through the serially connected current detection circuits, real-time accurate detection of the motor current is realized, and the operation state of the motor is controlled based on the current detection result.

Description

Technical Field

[0001] The present application relates to the field of H-bridge driving technology, and in particular to an H-bridge driving circuit, an H-bridge module and an electronic device. Background Art

[0002] H-bridge is a device that can reverse the voltage or current at both ends of the connected load or output terminal, and is usually used for forward and reverse control of DC motors and speed control, stepper motor control, etc. For example, the H-bridge circuit consists of four switch tubes, two N-type switch tubes and two P-type switch tubes; the P-type tube is turned on when the gate is at a low level and turned off when the gate is at a high level, and the N-type tube is turned on when the gate is at a high level and turned off when the gate is at a low level. The diagonal conduction of the four switch tubes realizes the voltage reversal or current reversal at both ends of the motor, thereby realizing the forward and reverse rotation of the motor.

[0003] During the operation of the motor, the magnitude and phase of the motor current are key parameters that reflect the state of the motor, and have a direct impact on the control accuracy and operation stability of the motor. In order to facilitate the sampling of the motor current, in the patent with announcement number CN106370997A, a current sensor is used to sample the phase current, and a Hall sensor is placed near the line through which the current flows, and the magnitude of the current can be converted into a Hall voltage. The voltage signal of the Hall sensor can be amplified by the operational amplifier circuit to calculate the magnitude of the phase current. However, although the range of current that can be detected by the above circuit is large, the cost is high. Therefore, how to more conveniently sample the motor current and control the operation of the motor is a problem that needs to be solved urgently. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present application provides an H-bridge driving circuit, an H-bridge module and an electronic device.

[0005] In a first aspect, the present application provides an H-bridge driving circuit, comprising:

[0006] A current detection circuit is connected in series with the output end of the H-bridge circuit and the motor driven by the H-bridge circuit to detect the phase current of the motor and output a current detection signal;

[0007] A controller connected to the current detection circuit, and outputting a first control signal and a second control signal in response to the current detection signal;

[0008] a first driving circuit connected to the controller and the P-type transistor in the H-bridge circuit, and responding to the first control signal to control the on and off of the P-type transistor;

[0009] The second driving circuit is connected to the controller and the N-type transistor in the H-bridge circuit, and responds to the second control signal to control the on and off of the N-type transistor.

[0010] Optionally, the first driving circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first NPN transistor Q1;

[0011] One end of the first resistor R1 is connected to the controller, and the other end is connected to one end of the second resistor R2 and the base of the first NPN transistor Q1;

[0012] The collector of the first NPN transistor Q1 is connected to one end of the third resistor R3, and the emitter is connected to the other end of the second resistor R2 and the ground;

[0013] The other end of the third resistor R3, one end of the fourth resistor R4 and one end of the fifth resistor R5 are connected to the first node N1;

[0014] The other end of the fourth resistor R4 is connected to a power supply;

[0015] The other end of the fifth resistor R5 is connected to the gate of the P-type tube.

[0016] Optionally, the first driving circuit further includes a first protection subcircuit; the first protection subcircuit includes a first voltage regulator tube D1 and a sixth resistor R6;

[0017] The cathode of the first voltage regulator tube D1 is connected to the power supply and the source of the P-type tube, and the anode is connected to one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected to the first node N1.

[0018] Optionally, the second driving circuit includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a second NPN transistor Q2;

[0019] One end of the seventh resistor R7 is connected to the controller, and the other end is connected to one end of the eighth resistor R8 and the base of the second NPN transistor Q2;

[0020] The collector of the second NPN transistor Q2 and one end of the ninth resistor R9 are connected to the second node N2, and the emitter is connected to the other end of the eighth resistor R8 and the ground;

[0021] The other end of the ninth resistor R9 is connected to a power supply;

[0022] The second node N2 is used to be connected to the gate of the N-type transistor.

[0023] Optionally, the second driving circuit further includes a regulating and filtering subcircuit; the regulating and filtering subcircuit is arranged between the second node N2 and the N-type transistor; the regulating and filtering subcircuit includes a tenth resistor R10 and a capacitor C;

[0024] One end of the capacitor C and one end of the tenth resistor R10 are connected to the second node N2, and the other end of the capacitor C is connected to the source of the N-type transistor and the ground;

[0025] The other end of the tenth resistor R10 is connected to the gate of the N-type transistor.

[0026] Optionally, the second driving circuit further includes a second protection subcircuit; the second protection subcircuit includes a second voltage regulator tube D2 and an eleventh resistor R11;

[0027] The cathode of the second voltage regulator tube D2 is connected to the second node N2, and the anode is connected to the source of the N-type tube and the ground;

[0028] The eleventh resistor R11 is connected in parallel with the second voltage regulator tube D2.

[0029] Optionally, the first control signal and the second control signal both include a first PWM signal and a second PWM signal; the controller is configured to output one of the first PWM signal or the second PWM signal based on the current detection signal;

[0030] Wherein, the duty cycle of the first PWM signal is smaller than the duty cycle of the second PWM signal.

[0031] Optionally, the current detection circuit includes a sampling resistor R0, an amplifier U1 and an analog-to-digital conversion chip U2;

[0032] One end of the sampling resistor R0 is connected to the motor and the first input end of the amplifier U1, and the other end is connected to the drain of the P-type tube, the drain of the N-type tube and the second end of the amplifier U1;

[0033] The input end of the analog-to-digital conversion chip U2 is connected to the output end of the amplifier U1 , and the output end of the analog-to-digital conversion chip U2 is connected to the controller.

[0034] In a second aspect, in one embodiment, the present application provides an H-bridge module including an H-bridge circuit and the H-bridge driving circuit as described above.

[0035] In a third aspect, in one embodiment, the present application provides an electronic device, comprising the H-bridge driving circuit as described above or the H-bridge module as described above.

[0036] Through the above technical solution, this application includes at least the following beneficial technical effects:

[0037] The current detection circuit is connected in series with the output end of the H-bridge circuit and the motor, so that the real-time detection of the motor phase current is realized, so that the current detection circuit can directly obtain the current information when the motor is running, without the need for an additional current sensor or conversion circuit, simplifying the structure of current sampling and reducing costs. Then the controller responds to the current detection signal, and adjusts the first control signal and the second control signal in real time to control the on and off of the P-type tube and the N-type tube in the H-bridge circuit. Finally, the P-type tube and the N-type tube are controlled respectively by the first drive circuit and the second drive circuit, ensuring the stable operation of the H-bridge circuit and improving the overall efficiency of the circuit. Therefore, the series current detection circuit not only realizes the real-time and accurate detection of the motor current, but also controls the motor operation state based on the current detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 1 is a block diagram of an H-bridge driving circuit in one embodiment of the present application.

[0040] Figure 2 This is a connection structure diagram of an H-bridge driving circuit in one embodiment of the present application.

[0041] Figure 3 This is a waveform diagram of driving a P-type tube in one embodiment of the present application.

[0042] Figure 4 This is a waveform diagram of driving an N-type transistor in one embodiment of the present application.

[0043] Explanation of the accompanying drawings: 1. First driving circuit; 2. Second driving circuit; 3. Current detection circuit; 4. Controller. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0045] In the description of the present application, it should be understood that the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In the present application, the word "exemplary" is used to mean "used as an example, illustration or description". Any embodiment described as "exemplary" in the present application is not necessarily interpreted as being more preferred or more advantageous than other embodiments. In order to enable any technician in the field to implement and use the present application, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can also be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the present application obscure. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

[0046] First, as Figure 1 , 2 As shown, in one embodiment, the present application provides an H-bridge driving circuit, the H-bridge driving circuit comprising:

[0047] The current detection circuit 3 is connected in series with the output end of the H-bridge circuit and the motor driven by the H-bridge circuit to detect the phase current of the motor and output a current detection signal;

[0048] The output end of the H-bridge circuit is the series connection node of the P-type tube and the N-type tube.

[0049] A controller 4 is connected to the current detection circuit 3 and outputs a first control signal and a second control signal in response to the current detection signal;

[0050] A first driving circuit 1, connected to the controller 4 and the P-type transistor in the H-bridge circuit, responding to the first control signal to control the on and off of the P-type transistor;

[0051] The second driving circuit 2 is connected to the controller 4 and the N-type transistor in the H-bridge circuit, and responds to the second control signal to control the on and off of the N-type transistor.

[0052] Specifically, since the H-bridge circuit includes two N-type transistors and two P-type transistors, combined Figure 2, P-type transistors are Q3 and Q4; N-type transistors are Q5 and Q6. Therefore, in this embodiment, two groups of first drive circuits 1 and second drive resistors are provided, and the structures of the two groups of first drive circuits 1 are consistent, and the structures of the two groups of second drive circuits 2 are consistent. The controller 4 includes four output terminals and one input terminal, and each output terminal of the controller 4 is correspondingly connected to the first drive circuit 1 or the second drive circuit 2.

[0053] In the above implementation, the current detection circuit 3 is connected in series with the output end of the H-bridge circuit and the motor, so as to realize the real-time detection of the motor phase current, so that the current detection circuit 3 can directly obtain the current information when the motor is running, without the need for an additional current sensor or conversion circuit, simplifying the structure of current sampling and reducing the cost. Then the controller 4 responds to the current detection signal, and adjusts the first control signal and the second control signal in real time to control the on and off of the P-type tube and the N-type tube in the H-bridge circuit. Finally, the P-type tube and the N-type tube are controlled respectively by the first drive circuit 1 and the second drive circuit 2, so as to ensure the stable operation of the H-bridge circuit and improve the overall efficiency of the circuit. Therefore, the series current detection circuit 3 not only realizes the real-time and accurate detection of the motor current, but also controls the motor operation state based on the current detection result.

[0054] Reference Figure 1 , as an implementation of the first driving circuit 1, the first driving circuit 1 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first NPN transistor Q1;

[0055] One end of the first resistor R1 is connected to the controller 4, and the other end is connected to one end of the second resistor R2 and the base of the first NPN transistor Q1;

[0056] The collector of the first NPN transistor Q1 is connected to one end of the third resistor R3, and the emitter is connected to the other end of the second resistor R2 and the ground;

[0057] The other end of the third resistor R3, one end of the fourth resistor R4 and one end of the fifth resistor R5 are connected to the first node N1;

[0058] The other end of the fourth resistor R4 is connected to the power supply;

[0059] The other end of the fifth resistor R5 is connected to the gate of the P-type tube.

[0060] In the above implementation, the first resistor R1 is used to effectively control the magnitude of the current flowing through, thereby avoiding damage to circuit components caused by excessive current. The second resistor R2 serves as a protection resistor for the first NPN transistor Q1, thereby effectively protecting the base and emitter of the first NPN transistor Q1 from voltage and current damage. Then, a voltage divider network composed of the fourth resistor R4 and the third resistor R3 is used to provide a suitable driving voltage to the P-type tube. The fifth resistor R5 serves as a driving resistor, and by adjusting its resistance value, precise control of the switching speed of the switch tube can be achieved, thereby achieving driving of the H-bridge circuit while improving the safety of the circuit.

[0061] Reference Figure 2 As a further implementation of the first driving circuit 1, the first driving circuit 1 further includes a first protection subcircuit; the first protection subcircuit includes a first voltage regulator tube D1 and a sixth resistor R6;

[0062] The cathode of the first voltage regulator tube D1 is connected to the power supply and the source of the P-type tube, and the anode is connected to one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected to the first node N1.

[0063] It should be noted that the voltage platform of the PN-type H-bridge driving circuit in the related art is generally lower than 20V, which limits the power supply of other components in the system. In the design higher than 20V, if only one resistor is used for voltage division, it is easy to cause the risk of instability of the P-type tube voltage. Therefore, in this embodiment, the third resistor R3 and the fourth resistor R4 are used for voltage division and the first voltage regulator tube D1 is connected in parallel, so that the gate-drain voltage VGS of the P-type tube can be stabilized within 20V, so that the circuit has better stability and reliability.

[0064] In the above embodiment, the cathode of the first voltage regulator D1 is directly connected to the power supply and the source of the P-type tube, and the anode thereof is connected to one end of the sixth resistor R6. This connection mode enables the voltage regulator tube to effectively stabilize the power supply voltage and avoid the adverse effects of voltage fluctuations on the P-type tube. In addition, the connection between the sixth resistor R6 and the first node N1 forms an effective voltage-dividing network, so that the voltage can be reasonably distributed, thereby ensuring that the voltage across the gate source of the P-type tube is maintained at about 12V, thereby ensuring that when the power supply voltage is greater than 20V, the gate source of the P-type tube will not be broken down by the voltage.

[0065] As an implementation of the second driving circuit 2, the second driving circuit 2 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a second NPN transistor Q2;

[0066] One end of the seventh resistor R7 is connected to the controller 4, and the other end is connected to one end of the eighth resistor R8 and the base of the second NPN transistor Q2;

[0067] The collector of the second NPN transistor Q2 and one end of the ninth resistor R9 are connected to the second node N2, and the emitter is connected to the other end of the eighth resistor R8 and the ground;

[0068] The other end of the ninth resistor R9 is connected to the power supply;

[0069] The second node N2 is used to be connected to the gate of the N-type transistor.

[0070] In the above embodiment, when the controller 4 sends a signal, the seventh resistor R7 can effectively limit the current flowing through to drive the second NPN transistor Q2 to be grounded or disconnected. The eighth resistor R8 serves as a protective resistor at both ends of the base and emitter of the second NPN transistor Q2, and the ninth resistor R9 prevents the power supply from being short-circuited to the ground when the second NPN transistor Q2 is turned on, so that the second NPN transistor Q2 can be stably turned on and off, so that the voltage of the second node N2 can stably drive the N-type transistor to be turned on and off.

[0071] Reference Figure 2 As a further implementation of the second driving circuit 2, the second driving circuit 2 further includes a regulating filter subcircuit; the regulating filter subcircuit is arranged between the second node N2 and the N-type tube; the regulating filter subcircuit includes a tenth resistor R10 and a capacitor C;

[0072] One end of the capacitor C and one end of the tenth resistor R10 are connected to the second node N2, and the other end of the capacitor C is connected to the source of the N-type transistor and the ground;

[0073] The other end of the tenth resistor R10 is connected to the gate of the N-type tube.

[0074] As a further implementation of the second driving circuit 2, the second driving circuit 2 further includes a second protection subcircuit; the second protection subcircuit includes a second voltage regulator tube D2 and an eleventh resistor R11;

[0075] The cathode of the second voltage regulator tube D2 is connected to the second node N2, and the anode is connected to the source of the N-type tube and the ground;

[0076] The eleventh resistor R11 is connected in parallel with the second voltage regulator tube D2.

[0077] In the above implementation, the second voltage regulator D2 and the eleventh resistor R11 are used to stabilize the voltage between the gate and source of the N-type tube to ensure that the gate and source of the N-type tube are not broken down by high voltage. The capacitor C and the tenth resistor R10 adjust the switching speed of the gate and source of the N-type tube, and form a low-frequency RC filter to filter out high-frequency noise, thereby adjusting the waveform of the N-type tube driving voltage.

[0078] As an implementation of the current detection circuit 3, the current detection circuit 3 includes a sampling resistor R0, an amplifier U1 and an analog-to-digital conversion chip U2;

[0079] One end of the sampling resistor R0 is connected to the motor and the first input end of the amplifier U1, and the other end is connected to the drain of the P-type tube, the drain of the N-type tube and the second end of the amplifier U1;

[0080] The input end of the analog-to-digital conversion chip U2 is connected to the output end of the amplifier U1 , and the output end of the analog-to-digital conversion chip U2 is connected to the controller 4 .

[0081] Reference Figure 3 , Figure 3 The first control signal output by the controller 4 and the VEB signal timing of the P-type tube are shown in the schematic diagram when the P-type tube is turned on, wherein the first control signal is 0-3.3V and the VEB of the P-type tube is 0-12V. When the P-type tube is turned on, the N-type tube is turned off, and the H-bridge circuit drives the motor to rotate forward. At this time, the first control signal output by the controller 4 is high level, the first NPN transistor Q1 is turned on, the power supply voltage passes through the third resistor R3 and the fourth resistor R4 to the ground, the VEB of the P-type tube is the same as the divided voltage on the fourth resistor R4, and the P-type tube is turned on. When the first control signal output by the controller 4 is low level, the first NPN transistor Q1 is turned off, the gate and source voltages of the P-type tube are equal, and the P-type tube is turned off.

[0082] Reference Figure 4 , Figure 4 The second control signal output by the controller 4 and the N-type tube VEB signal timing when the N-type tube is turned on are shown, wherein the second control signal is 0-3.3V and the N-type tube VEB is 0-12V. When the P-type tube is turned off, the N-type tube is turned on and the motor reverses. At this time, the second control signal output by the controller 4 is low level, the second NPN transistor Q2 is turned off, the gate of the N-type tube is 12V, and the N-type tube is turned on. When the second control signal output by the controller 4 is high level, the second NPN transistor Q2 is turned on, the power supply 12V passes through the second NPN transistor Q2 to the ground, and the N-type tube is turned off.

[0083] As an implementation manner of the controller 4, the first control signal and the second control signal both include a first PWM signal and a second PWM signal; the controller 4 is configured to output one of the first PWM signal or the second PWM signal based on the current detection signal;

[0084] The duty cycle of the first PWM signal is smaller than the duty cycle of the second PWM signal.

[0085] It should be noted that the duty cycle of the first PWM signal and the second PWM signal can be adjusted according to actual conditions, and again no specific limitation is made.

[0086] As an example, when the H-bridge circuit is not connected to the motor, no phase current passes through the sampling resistor R0, and the output voltage signal through the amplifier U1 is close to zero. The sampling signal is then converted into a digital signal through the analog-to-digital conversion chip U2 and fed back to the controller 4. The controller 4 determines that there is no motor connected. At this time, the four input terminals can be controlled to output a first PWM signal with a relatively small duty cycle, thereby reducing the on-time of the P-type tube and the N-type tube in the entire cycle. When the H-bridge circuit is connected to the motor, a phase current passes through the sampling resistor R0, and the amplifier U1 amplifies the signal and then converts it into a digital signal through the analog-to-digital conversion chip U2, and then feeds it back to the controller 4 for signal processing, so that the controller 4 outputs a second PWM signal with a relatively large duty cycle, thereby reducing system power consumption.

[0087] In the above implementation, the first control signal and the second control signal can be output in two states, one is a first PWM signal with a larger duty cycle, and the other is a second PWM signal with a smaller duty cycle, thereby realizing the selection of a suitable control signal according to the actual working conditions of the motor, thereby reducing power consumption while ensuring the normal operation of the motor.

[0088] In a second aspect, in one embodiment, the present application provides an H-bridge module including an H-bridge circuit and the H-bridge driving circuit as described above.

[0089] In a third aspect, in one embodiment, the present application provides an electronic device, comprising the H-bridge driving circuit as described above or the H-bridge module as described above.

[0090] The above are only preferred embodiments of the present application, and are not intended to limit the present application in any form. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present application. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. An H-bridge driving circuit, characterized in that: include: A current detection circuit (3) is connected in series with the output end of the H-bridge circuit and the motor driven by the H-bridge circuit to detect the phase current of the motor and output a current detection signal; A controller (4) connected to the current detection circuit (3) and outputting a first control signal and a second control signal in response to a current detection signal; A first driving circuit (1) is connected to the controller (4) and the P-type transistor in the H-bridge circuit, and responds to the first control signal to control the on and off of the P-type transistor; The second driving circuit (2) is connected to the controller (4) and the N-type transistor in the H-bridge circuit, and responds to the second control signal to control the on and off of the N-type transistor.

2. The circuit according to claim 1, characterized in that The first driving circuit (1) comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first NPN transistor Q1; One end of the first resistor R1 is connected to the controller (4), and the other end is connected to one end of the second resistor R2 and the base of the first NPN transistor Q1; The collector of the first NPN transistor Q1 is connected to one end of the third resistor R3, and the emitter is connected to the other end of the second resistor R2 and the ground; The other end of the third resistor R3, one end of the fourth resistor R4 and one end of the fifth resistor R5 are connected to the first node N1; The other end of the fourth resistor R4 is connected to a power supply; The other end of the fifth resistor R5 is connected to the gate of the P-type tube.

3. The circuit according to claim 2, characterized in that The first driving circuit (1) further comprises a first protection subcircuit; the first protection subcircuit comprises a first voltage regulator tube D1 and a sixth resistor R6; The cathode of the first voltage regulator tube D1 is connected to the power supply and the source of the P-type tube, and the anode is connected to one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected to the first node N1.

4. The circuit according to claim 1, characterized in that The second driving circuit (2) comprises a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a second NPN transistor Q2; One end of the seventh resistor R7 is connected to the controller (4), and the other end is connected to one end of the eighth resistor R8 and the base of the second NPN transistor Q2; The collector of the second NPN transistor Q2 and one end of the ninth resistor R9 are connected to the second node N2, and the emitter is connected to the other end of the eighth resistor R8 and the ground; The other end of the ninth resistor R9 is connected to a power supply; The second node N2 is used to be connected to the gate of the N-type transistor.

5. The circuit according to claim 4, characterized in that The second driving circuit (2) further comprises a regulating and filtering subcircuit; the regulating and filtering subcircuit is arranged between the second node N2 and the N-type transistor; the regulating and filtering subcircuit comprises a tenth resistor R10 and a capacitor C; One end of the capacitor C and one end of the tenth resistor R10 are connected to the second node N2, and the other end of the capacitor C is connected to the source of the N-type transistor and the ground; The other end of the tenth resistor R10 is connected to the gate of the N-type transistor.

6. The circuit according to claim 5, characterized in that The second driving circuit (2) further comprises a second protection subcircuit; the second protection subcircuit comprises a second voltage regulator tube D2 and an eleventh resistor R11; The cathode of the second voltage regulator tube D2 is connected to the second node N2, and the anode is connected to the source of the N-type tube and the ground; The eleventh resistor R11 is connected in parallel with the second voltage regulator tube D2.

7. The circuit according to claim 5, characterized in that The first control signal and the second control signal both include a first PWM signal and a second PWM signal; the controller (4) is configured to output one of the first PWM signal or the second PWM signal based on the current detection signal; Wherein, the duty cycle of the first PWM signal is smaller than the duty cycle of the second PWM signal.

8. The circuit according to claim 1, characterized in that The current detection circuit (3) comprises a sampling resistor R0, an amplifier U1 and an analog-to-digital conversion chip U2; One end of the sampling resistor R0 is connected to the motor and the first input end of the amplifier U1, and the other end is connected to the drain of the P-type tube, the drain of the N-type tube and the second end of the amplifier U1; The input end of the analog-to-digital conversion chip U2 is connected to the output end of the amplifier U1, and the output end of the analog-to-digital conversion chip U2 is connected to the controller (4).

9. An H-bridge module, characterized in that: It comprises an H-bridge circuit and an H-bridge driving circuit as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: It includes the H-bridge driving circuit as described in any one of claims 1 to 8 or the H-bridge module as described in claim 9.

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