A bidirectional driving circuit and electronic device

Abstract

The application provides a bidirectional driving circuit and an electronic device, the bidirectional driving circuit comprises a protection unit, a first driving unit and a second driving unit; the first driving unit is connected with the protection unit and the second driving unit; when the current flowing through the protection unit is in a first direction, the first driving unit outputs a control signal to the protection unit, so that the protection unit is in a working state; and when the current flowing through the protection unit is in a second direction, the second driving unit controls the first driving unit to output the control signal to the protection unit, so that the protection unit is in the working state. The bidirectional driving circuit can control the protection circuit to be in the working state when the current flows in the positive direction and the reverse direction, so that the current can flow in the positive direction and the reverse direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a bidirectional drive circuit and an electronic device. BACKGROUND

[0002] DC-DC converter is one of the core components of new energy vehicle electrical system, which is used to reduce the high voltage of high voltage battery pack to low voltage to charge the low voltage storage battery.

[0003] When the vehicle is powered off, the DC-DC input voltage drops rapidly, and the drive of the DC-DC secondary side has a delay and cannot be immediately turned off. At this time, the low voltage storage battery will back-feeding voltage into the DC-DC, bringing a great voltage spike between the source and the drain of the MOSFET of the DC-DC secondary side, which may cause the MOSFET to fail. In order to cut off the reverse current in this working condition, a group of MOSFET tubes are generally connected in series at the output end of the DC-DC to cut off the reverse current. This group of MOSFETs is generally called oring tube (also called "or gate control" or "or logic control"). The drive circuit of the oring tube monitors the voltage between the source and the drain of the oring tube to determine the direction of the current, so as to control the turn-on and turn-off of the oring tube.

[0004] The drive circuit of the oring tube in the past is completely controlled by hardware and cannot forcibly turn on the oring tube. For bidirectional DC-DC, the current needs to flow in the forward direction when working in the forward direction, and needs to flow in the reverse direction when working in the reverse direction. However, the drive circuit of the oring tube in the past will turn off the oring tube when working in the reverse direction, which cannot realize the reverse flow of the current, which limits the application of bidirectional DC-DC. SUMMARY

[0005] The present application mainly provides a bidirectional drive circuit and an electronic device, which solves the problem that the current of the bidirectional DC-DC cannot flow in the reverse direction in the prior art.

[0006] To solve the above technical problems, the first technical solution adopted by the present application is to provide a bidirectional drive circuit, comprising: a protection unit, a first drive unit and a second drive unit; the first drive unit is connected to the protection unit and the second drive unit;

[0007] When the current flowing through the protection unit is in the first direction, the first drive unit outputs a control signal to the protection unit, so that the protection unit is in the working state; and when the current flowing through the protection unit is in the second direction, the second drive unit controls the first drive unit to output a control signal to the protection unit, so that the protection unit is in the working state.

[0008] In an embodiment, the protection unit comprises a first passage terminal, a second passage terminal and a control terminal; the first driving unit comprises a first driving terminal, a second driving terminal, a third driving terminal and a fourth driving terminal; the first driving terminal is connected to the first passage terminal, the second driving terminal is connected to the second passage terminal, and the third driving terminal is connected to the control terminal; the second driving unit is connected to the fourth driving terminal and the first driving terminal;

[0009] In response to the current flowing from the first passage terminal to the second passage terminal, the current is in a first direction, and the first driving unit outputs a control signal to the protection unit;

[0010] In response to the current flowing from the second passage terminal to the first passage terminal, the current is in a second direction, and the second driving unit connects the fourth driving terminal and the first driving terminal, so that the first driving unit outputs the control signal to the protection unit.

[0011] In an embodiment, the second driving unit comprises a control unit and a switch unit; the control unit is connected to the switch unit, and the switch unit is connected to the fourth driving terminal and the first driving terminal;

[0012] In response to the current being in the first direction, the control unit controls the switch unit to be in an off state; in response to the current being in the second direction, the control unit controls the switch unit to be in an on state, thereby connecting the fourth driving terminal and the first driving terminal.

[0013] In an embodiment, the control unit comprises a first transistor, a base of the first transistor is used to connect a driving port to receive a driving signal, an emitter of the first transistor is grounded, and a collector of the first transistor is connected to the switch unit.

[0014] In an embodiment, the control unit further comprises a first resistor and a second resistor; a first end of the first resistor is connected to the driving port, a second end of the first resistor is connected to the base of the first transistor; a first end of the second resistor is connected to the second end of the first resistor, and a second end of the second resistor is connected to the emitter of the first transistor.

[0015] In an embodiment, the switch unit comprises a first transistor, comprising a first passage terminal, a second passage terminal and a control terminal, the first passage terminal of the first transistor is connected to the fourth driving terminal, the second passage terminal of the first transistor is connected to the first driving terminal, and the control terminal of the first transistor is connected to the control unit.

[0016] In an embodiment, the switch unit comprises a third resistor and a fourth resistor; a first end of the third resistor is connected to the control unit, a second end of the third resistor is connected to the control terminal of the first transistor, a first end of the fourth resistor is connected to the control terminal of the first transistor, and a second end of the fourth resistor is connected to the first passage terminal of the first transistor.

[0017] In an embodiment, the first driving unit comprises a second transistor, a third transistor and a fourth transistor, a base of the second transistor is connected with a base of the third transistor and the fourth driving end, an emitter of the second transistor is connected with the fourth driving end, a collector of the second transistor is connected with the second driving end; an emitter of the third transistor is connected with the first driving end, a collector of the third transistor is connected with a base of the fourth transistor; an emitter of the fourth transistor is connected with the power receiving end and the third driving end, a collector of the fourth transistor is connected with the first driving end.

[0018] In an embodiment, the first driving unit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a filter capacitor;

[0019] a first end of the fifth resistor is connected with the power receiving end, a second end of the fifth resistor is connected with a first end of the sixth resistor, a second end of the sixth resistor is connected with the emitter of the fourth transistor and the third driving end; a first end of the seventh resistor is connected with the second end of the fifth resistor, a second end of the seventh resistor is connected with the base of the fourth transistor; a first end of the eighth resistor is connected with the second end of the fifth resistor, a second end of the eighth resistor is connected with the fourth driving end; a first end of the ninth resistor is connected with the emitter of the third transistor, a second end of the ninth resistor is connected with the first driving end; a first end of the filter capacitor is connected with the base of the third transistor, a second end of the filter capacitor is connected with the emitter of the third transistor.

[0020] To solve the above technical problems, the second technical solution of the present application is to provide an electronic device comprising the bidirectional driving circuit of any one of the above.

[0021] The beneficial effects of the present application are that, different from the prior art, the bidirectional driving circuit and the electronic device provided by the present application, the bidirectional driving circuit comprises a protection unit, a first driving unit and a second driving unit; the first driving unit is connected with the protection unit and the second driving unit; when the current flowing through the protection unit is in a first direction, the first driving unit outputs a control signal to the protection unit, so that the protection unit is in an operating state; and when the current flowing through the protection unit is in a second direction, the second driving unit controls the first driving unit to output a control signal to the protection unit, so that the protection unit is in an operating state. The bidirectional driving circuit can control the protection circuit to be in an operating state when the current flows in a forward direction and a reverse direction, so that the current can flow in a forward direction and a reverse direction. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0023] Figure 1 Structure diagram of an embodiment of a bidirectional driving circuit of the present application;

[0024] Figure 2 Structure diagram of an embodiment of an electronic device of the present application. DETAILED DESCRIPTION

[0025] The scheme of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0026] In the following description, specific details are set forth in order to provide a thorough understanding of the present application. However, persons of ordinary skill in the art will realize that the application can be practiced without some or all of these details.

[0027] The term "and / or", used herein only describes an associated relationship for associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects. In addition, "multiple" herein means two or more than two.

[0028] 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 the present application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application, and are not intended to limit the present application.

[0029] Before the embodiments of the present application are further described in detail, the terms and phrases involved in the embodiments of the present application are explained, which are applicable to the following explanations.

[0030] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] The present application provides a bidirectional driving circuit, and it should be noted that the bidirectional driving circuit of the present application is a bidirectional DC-DC converter, which can realize the forward flow and reverse flow of current, so as to achieve the bidirectional transmission of energy between the input side and the output side. Specifically, the bidirectional DC-DC converter of the present application can be applied to the charging and discharging of a battery, an energy storage system (energy flows bidirectionally between an energy storage device and a power grid / load), etc.

[0032] Referring to Figure 1 , Figure 1Fig. 1 is a structural schematic diagram of an embodiment of a bidirectional driving circuit according to the present application. The bidirectional driving circuit comprises a protection unit 11, a first driving unit 12 and a second driving unit 13. The protection unit 11 is an oring tube. The protection unit 11 is connected between a power supply end 2 and a load end 1. When the power supply end 2 supplies power to the load end 1, the current flows in a first direction. When the load end 1 discharges, the current flows in a second direction.

[0033] Specifically, the first driving unit 12 is connected between the protection unit 11 and the second driving unit 13. When the current flowing through the protection unit 11 is in the first direction (i.e. the power supply end 2 supplies power to the load end 1, which is defined as the current flowing in a forward direction), the first driving unit 12 outputs a control signal to the protection unit 11, so that the protection unit 11 is in an operating state. When the current flowing through the protection unit 11 is in the second direction (i.e. the load end 1 discharges, which is defined as the current flowing in a reverse direction), the second driving unit 13 controls the first driving unit 12 to output a control signal to the protection unit 11, so that the protection unit 11 is in an operating state. Specifically, the protection unit 11 comprises a first passage end S1, a second passage end D1 and a control end G1. The first driving unit 12 comprises a first driving end S2, a second driving end D2, a third driving end G2 and a fourth driving end B. The first driving end S2 is connected to the first passage end S1, the second driving end D2 is connected to the second passage end D1, and the third driving end G2 is connected to the control end G1. The second driving unit 13 is connected to the fourth driving end B and the first driving end S2. In response to the current flowing from the first passage end S1 to the second passage end D1, the current is in the first direction, and the first driving unit 12 outputs a control signal to the protection unit 11, so that the protection unit 11 is in an operating state. In response to the current flowing from the second passage end D1 to the first passage end S1, the current is in the second direction, and the second driving unit 13 connects the fourth driving end B and the first driving end S2, so that the first driving unit 12 outputs a control signal to the protection unit 11, and the protection unit 11 is in an operating state. It can be understood that when the protection unit 11 is in an operating state, the current can flow through the protection unit 11. In this way, no matter whether the current flows in the first direction (forward direction) or the second direction (reverse direction), the protection unit 11 will not block the flow of the current, so that the current can flow in both forward and reverse directions.

[0034] In an embodiment, the second driving unit 13 comprises a control unit 131 and a switch unit 132; the control unit 131 is connected to the switch unit 132, and the switch unit 132 is connected to the fourth driving end B and the first driving end S2. In response to the current being in the first direction, i.e. the power supply end 2 supplies power to the load end 1, the current flows from the first passage end S1 to the second passage end D1, at this time the control unit 131 controls the switch unit 132 to be in the off state, the fourth driving end B and the first driving end S2 are disconnected, so that the first driving unit 12 outputs a control signal to the protection unit 11, so that the protection unit 11 is in the working state. In response to the current being in the second direction, i.e. the load end 1 is discharged, the current flows from the second passage end D1 to the first passage end S1, at this time the control unit 131 controls the switch unit 132 to be in the on state, thereby connecting the fourth driving end B and the first driving end S2, so that the first driving unit 12 outputs a control signal to the protection unit 11, so that the protection unit 11 is in the working state.

[0035] Specifically, the control unit 131 comprises a first transistor T1, the base of the first transistor T1 is used to connect the driving port and receive the driving signal P, the emitter of the first transistor T1 is grounded GND, and the collector of the first transistor T1 is connected to the switch unit 132. Further, the control unit 131 further comprises a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is connected to the driving port and receives the driving signal P, and the second end of the first resistor R1 is connected to the base of the first transistor T1; the first end of the second resistor R2 is connected to the second end of the first resistor R1, and the second end of the second resistor R2 is connected to the emitter of the first transistor T1.

[0036] In an embodiment, the switch unit 132 comprises a first transistor Q1, the first transistor Q1 comprises a first passage end, a second passage end and a control end, the first passage end of the first transistor Q1 is connected to the fourth driving end B, the second passage end of the first transistor Q1 is connected to the first driving end S2, and the control end of the first transistor Q1 is connected to the control unit 131.

[0037] Further, the switch unit 132 further comprises a third resistor R3 and a fourth resistor R4; the first end of the third resistor R3 is connected to the control unit 131, specifically connected to the collector of the first transistor T1, the second end of the third resistor R3 is connected to the control end of the first transistor Q1, the first end of the fourth resistor R4 is connected to the control end of the first transistor Q1, and the second end of the fourth resistor R4 is connected to the first passage end of the first transistor Q1.

[0038] In an embodiment, the first driving unit 12 comprises a second transistor T2, a third transistor T3 and a fourth transistor T4, a base of the second transistor T2 is connected with a base of the third transistor T3 and the fourth driving end B, an emitter of the second transistor T2 is connected with the fourth driving end B, a collector of the second transistor T2 is connected with the second driving end D2; an emitter of the third transistor T3 is connected with the first driving end S2, a collector of the third transistor T3 is connected with a base of the fourth transistor T4; an emitter of the fourth transistor T4 is connected with the power supply receiving end VCC and the third driving end G2, a collector of the fourth transistor T4 is connected with the first driving end S2.

[0039] Further, the first driving unit 12 further comprises a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a filter capacitor C. A first end of the fifth resistor R5 is connected with the power supply receiving end VCC, a second end of the fifth resistor R5 is connected with a first end of the sixth resistor R6, a second end of the sixth resistor R6 is connected with the emitter of the fourth transistor T4 and the third driving end G2; a first end of the seventh resistor R7 is connected with the second end of the fifth resistor R5, a second end of the seventh resistor R7 is connected with the base of the fourth transistor T4; a first end of the eighth resistor R8 is connected with the second end of the fifth resistor R5, a second end of the eighth resistor R8 is connected with the fourth driving end B; a first end of the ninth resistor R9 is connected with the emitter of the third transistor T3, a second end of the ninth resistor R9 is connected with the first driving end S2; a first end of the filter capacitor C is connected with the base of the third transistor T3, a second end of the filter capacitor C is connected with the emitter of the third transistor T3.

[0040] It should be noted that the second transistor T2 and the third transistor T3 are NPN type transistors, and the fourth transistor T4 is a PNP type transistor. The eighth resistor R8 and the seventh resistor R7 have the same resistance value. The power supply receiving end VCC is used to provide a power supply voltage, in a specific application, the power supply voltage is 12V. The reference capacitance of the filter capacitor C is 0.1 uF.

[0041] When the power supply end 2 supplies power to the load end 1, the current flows from the first passage end S1 of the protection unit 11 to the second passage end D1, and the current is defined as the first direction at this time. Assuming that the voltage between the gate (i.e. the control end G1) and the source (i.e. the first passage end S1) of the protection unit 11 is 0, the current flows through the body diode of the protection unit 11, the drain voltage of the protection unit 11 is lower than the source voltage, and the experimental data shows that it is about 0.7V lower, and since the base of the second transistor T2 and the base of the third transistor T3 are connected, and the base voltage of the second transistor T2 is also about 0.7V higher than the collector voltage. Therefore, the base voltage of the third transistor T3 is not higher than the emitter voltage, the emitter and the collector of the third transistor T3 are in a cut-off state, the collector of the third transistor T3 is pulled up to a high level by the seventh resistor R7, and the emitter of the fourth transistor T4 is also pulled up to a high level by the sixth resistor R6, so that the emitter and the base voltage of the fourth transistor T4 are equal. At this time, the emitter and the collector of the fourth transistor T4 are also in a cut-off state, the emitter remains in a high level state, and the third driving end G2 also remains in a high level state. Since the control end G1 of the protection unit 11 is connected to the third driving end G2, the protection unit 11 is turned on, and the current of the power supply end 2 flows to the load end 1 through the protection unit 11. It can be understood that the protection unit 11 is an NMOS tube, which is turned on when the control end G1 receives a high level and is cut off when it receives a low level.

[0042] It should be noted that after the protection unit 11 is turned on, since the protection unit 11 has an opening resistance, the current flowing from the source to the drain makes the source voltage still higher than the drain voltage, but the voltage difference between the two is very small. In addition, the base voltage of the third transistor T3 is slightly greater than the emitter voltage, but the current limiting effect of the ninth resistor R9 makes the base current of the third transistor T3 very small, and the emitter and the collector of the third transistor T3 are in a cut-off state, and the protection unit 11 still remains in an open state.

[0043] It is worth noting that when the current is in the first direction, the driving signal P is a low level signal, the base of the first transistor T1 is a low level signal, and the emitter and the collector thereof are cut off. At this time, the gate voltage of the first transistor Q1 is equal to the source voltage, and the first transistor Q1 is cut off.

[0044] When discharging at the load end 1, the current flows from the second passage end D1 of the protection unit 11 to the first passage end S1, at this time, the current is defined as the second direction. The driving signal P is a high level signal, the base of the first triode T1 is a high level signal, the emitter and the collector of the first triode T1 are turned on, the control end voltage of the first transistor Q1 is pulled low, the first transistor Q1 is turned on, then the first passage end and the second passage end of the first transistor Q1 are communicated, because the first passage end and the second passage end of the first transistor Q1 are connected with the fourth driving end B and the first driving end S2 respectively, the fourth driving end B and the first driving end S2 are communicated, and because the first driving end S2 is connected with the first passage end S1, the voltage of the fourth driving end B is clamped to 0V, that is, the base voltage of the second triode T2 and the third triode T3 is clamped to 0V, which causes the emitter and the collector of the third triode T3 to be in the cut-off state, the collector of the third triode T3 is pulled up to a high level by the seventh resistor R7, the emitter of the fourth triode T4 is also pulled up to a high level by the sixth resistor R6, so that the emitter and the base voltage of the fourth triode T4 are equal, at this time, the emitter and the collector of the fourth triode T4 are also in the cut-off state, the emitter remains in a high level state, and the third driving end G2 also remains in a high level state, because the control end G1 of the protection unit 11 is connected with the third driving end G2, then the protection unit 11 is turned on.

[0045] It should be noted that the first transistor Q1 is a PMOS tube.

[0046] It is worth mentioning that if there is no second driving unit 13, when the current is in the second direction, when the current flows from the second passage end D1 of the protection unit 11 to the first passage end S1, the drain voltage of the protection unit 11 is greater than the source voltage, that is, VsVd, the conduction condition is met, and the protection unit 11 is turned on. Further, the source-drain voltage difference of the protection unit 11 is proportional to the source-drain current, when the source-drain current of the protection unit 11 is small, the collector-base voltage of the second transistor T2 is also low, and the base current of the third transistor T3 is still insufficient to make the third transistor T3 in the on state, so the protection unit 11 remains in the on state. However, when the source-drain current of the protection unit 11 continues to increase, when it reaches a threshold value, the drain voltage is sufficient to make the third transistor T3 conduct, the emitter voltage of the third transistor T3 is pulled to a low level, the base voltage of the third transistor T3 is lower than the emitter, and the third transistor T3 is also in the on state, and the emitter is also pulled to a low level. Therefore, the gate voltage of the protection unit 11 is also pulled to a low level, and the protection unit 11 is turned off, and the current is cut off. After the current is cut off, the current decreases to 0, and since the voltage at the load end 1 of the protection unit 11 is still higher than the voltage at the power supply end 2, the protection unit 11 remains in the off state. When the protection unit 11 encounters current in the first direction again, the protection unit 11 can be turned on again. Therefore, if there is no second driving unit 13, as long as the current in the second direction reaches a certain value, the protection unit 11 will be turned off, which affects the application of the bidirectional driving circuit. The present application sets the second driving unit 13, regardless of the change of the current value in the second direction, the protection unit 11 can be in the on state, and the current flow is not affected. It can be understood that the bidirectional driving circuit of the present application can control the protection circuit to be in the working state when the current flows in the forward and reverse directions, so that the current can flow in the forward and reverse directions.

[0047] Referring to Figure 2 The structure of an embodiment of the electronic device of the present application is shown in the figure, and the electronic device 20 specifically includes a bidirectional driving circuit 21, for example, the bidirectional driving circuit shown in the above embodiment, which controls the protection circuit to be in the working state when the current flows in the forward and reverse directions, so that the current can flow in the forward and reverse directions.

[0048] It can be understood that the electronic device of the present application is, for example, a battery system, an energy storage system, etc., and is not specifically limited.

[0049] The above is only an embodiment of the present application, and does not limit the patent protection scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings of the present application, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A bidirectional drive circuit, characterized by, The application relates to a protection unit, a first driving unit and a second driving unit. The first driving unit is connected to the protection unit and the second driving unit. When the current flowing through the protection unit is in a first direction, the first driving unit outputs a control signal to the protection unit, so that the protection unit is in a working state. When the current flowing through the protection unit is in a second direction, the second driving unit controls the first driving unit to output the control signal to the protection unit, so that the protection unit is in the working state. The first direction current is a forward current, the second direction current is a reverse current, the protection unit is an oring tube for cutting off the reverse current, and the working state is that the oring tube is in a conducting state. The protection unit comprises a first passage end, a second passage end and a control end; the first driving unit comprises a first driving end, a second driving end, a third driving end and a fourth driving end; the first driving end is connected to the first passage end, the second driving end is connected to the second passage end, and the third driving end is connected to the control end; and the second driving unit is connected to the fourth driving end and the first driving end.

2. The bidirectional drive circuit of claim 1, wherein, In response to the current flowing from the first passage end to the second passage end, the current is in the first direction, and the first driving unit outputs the control signal to the protection unit. In response to the current flowing from the second passage end to the first passage end, the current is in the second direction, and the second driving unit connects the fourth driving end and the first driving end, so that the first driving unit outputs the control signal to the protection unit. The second driving unit comprises a control unit and a switch unit; the control unit is connected to the switch unit, and the switch unit is connected to the fourth driving end and the first driving end.

3. The bidirectional drive circuit of claim 2, wherein, In response to the current being in the first direction, the control unit controls the switch unit to be in an off state; and in response to the current being in the second direction, the control unit controls the switch unit to be in an on state, so that the fourth driving end and the first driving end are connected. The control unit comprises a first transistor, a base of the first transistor is used for connecting a driving port and receiving a driving signal, an emitter of the first transistor is grounded, and a collector of the first transistor is connected to the switch unit.

4. The bidirectional drive circuit of claim 3, wherein, The control unit further comprises a first resistor and a second resistor; a first end of the first resistor is connected to the driving port, a second end of the first resistor is connected to the base of the first transistor, a first end of the second resistor is connected to the second end of the first resistor, and a second end of the second resistor is connected to the emitter of the first transistor.

5. The bidirectional drive circuit of claim 4, wherein, The switch unit comprises a first transistor, a first passage end of the first transistor is connected to the fourth driving end, a second passage end of the first transistor is connected to the first driving end, and a control end of the first transistor is connected to the control unit.

6. The bidirectional drive circuit of claim 3, wherein, ​ 7. The bidirectional drive circuit of claim 6, wherein, The switch unit comprises a third resistor and a fourth resistor; a first end of the third resistor is connected to the control unit, a second end of the third resistor is connected to a control end of the first transistor, a first end of the fourth resistor is connected to the control end of the first transistor, and a second end of the fourth resistor is connected to a first pass end of the first transistor.

8. The bidirectional drive circuit of claim 3, wherein, The first drive unit comprises a second transistor, a third transistor and a fourth transistor; a base of the second transistor is connected to a base of the third transistor and the fourth drive end, an emitter of the second transistor is connected to the fourth drive end, and a collector of the second transistor is connected to the second drive end; an emitter of the third transistor is connected to the first drive end, a collector of the third transistor is connected to a base of the fourth transistor; an emitter of the fourth transistor is connected to a power supply receiving end and the third drive end, and a collector of the fourth transistor is connected to the first drive end.

9. The bidirectional drive circuit of claim 8, wherein, The first drive unit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a filter capacitor; A first end of the fifth resistor is connected to the power supply receiving end, a second end of the fifth resistor is connected to a first end of the sixth resistor, a second end of the sixth resistor is connected to an emitter of the fourth transistor and the third drive end; a first end of the seventh resistor is connected to the second end of the fifth resistor, a second end of the seventh resistor is connected to a base of the fourth transistor; a first end of the eighth resistor is connected to the second end of the fifth resistor, a second end of the eighth resistor is connected to the fourth drive end; a first end of the ninth resistor is connected to an emitter of the third transistor, a second end of the ninth resistor is connected to the first drive end; a first end of the filter capacitor is connected to a base of the third transistor, and a second end of the filter capacitor is connected to an emitter of the third transistor.

10. An electronic device, comprising: The bidirectional drive circuit comprises the bidirectional drive circuit according to any one of claims 1-9.

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