Bidirectional driving circuit and electronic device

Abstract

The invention provides a bidirectional driving circuit and an electronic device. The bidirectional driving circuit provided by the invention 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 a working state. The bidirectional driving circuit can control the protection circuit to be in a working state when current flows in the forward direction and the reverse direction, so that the current can flow in the forward direction and the reverse direction.

Description

Technical Field

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

[0002] The DC-DC converter is one of the core components of the electrical system of new energy vehicles. It is used to reduce the high voltage of the high-voltage battery pack to low voltage to charge the low-voltage battery.

[0003] When the vehicle is powered off, the DC-DC input voltage drops rapidly, but the secondary side of the DC-DC is delayed and cannot be shut down immediately. At this time, the low-voltage battery will reverse the voltage into the DC-DC, causing a large voltage spike between the source and drain of the DC-DC secondary MOSFET, which may cause the MOSFET to fail. To block the reverse current under this operating condition, a group of MOSFETs are generally connected in series at the output of the DC-DC to cut off the reverse current. This group of MOSFETs is generally called an ORing transistor (also known as "OR gate" or "OR logic control"). The ORing transistor's driver circuit monitors the voltage between the source and drain of the ORing transistor to determine the direction of current flow, thereby controlling the ORing transistor's on and off.

[0004] The drive circuits of conventional O-ring diodes (ORing diodes) are completely controlled by hardware, making it impossible to force the diode on. For bidirectional DC-DC converters, current must flow in the forward direction during forward operation and in the reverse direction during reverse operation. However, conventional O-ring diode drive circuits shut down the diode during reverse operation, preventing reverse current flow. This limits the application of bidirectional DC-DC converters. Summary of the Invention

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

[0006] In order to solve the above technical problems, the first technical solution adopted by the present invention is: providing a bidirectional driving circuit, comprising: 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; 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 a working state.

[0007] In one embodiment, the protection unit includes a first passage end, a second passage end, and a control end; the first drive unit includes a first drive end, a second drive end, a third drive end, and a fourth drive end; the first drive end is connected to the first passage end, the second drive end is connected to the second passage end, and the third drive end is connected to the control end; the second drive unit is connected to the fourth drive end and the first drive end; In response to the current flowing from the first path end to the second path end, the current is in a first direction, and the first driving unit outputs a control signal to the protection unit; In response to the current flowing from the second path end to the first path 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 a control signal to the protection unit.

[0008] In one embodiment, the second driving unit includes: 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; In response to the current being in a first direction, the control unit controls the switch unit to be in an off state; in response to the current being in a second direction, the control unit controls the switch unit to be in an on state, thereby connecting the fourth drive end and the first drive end.

[0009] In one embodiment, the control unit includes: a first transistor, a base of the first transistor is used to connect to the driving port and receive the driving signal, an emitter of the first transistor is grounded, and a collector of the first transistor is connected to the switch unit.

[0010] In one embodiment, the control unit also includes: a first resistor and a second resistor; the first end of the first resistor is connected to the driving port, and the second end of the first resistor is connected to the base of the first transistor; the first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is connected to the emitter of the first transistor.

[0011] In one embodiment, the switch unit includes: a first transistor, including a first pass end, a second pass end and a control end, the first pass end of the first transistor is connected to the fourth driving end, the second pass end of the first transistor is connected to the first driving end, and the control end of the first transistor is connected to the control unit.

[0012] In one embodiment, the switching unit includes: 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 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 the first path end of the first transistor.

[0013] In one embodiment, the first driving unit includes: a second triode, a third triode and a fourth triode, the base of the second triode is connected to the base of the third triode and the fourth driving end, the emitter of the second triode is connected to the fourth driving end, and the collector of the second triode is connected to the second driving end; the emitter of the third triode is connected to the first driving end, and the collector of the third triode is connected to the base of the fourth triode; the emitter of the fourth triode is connected to the power receiving end and the third driving end, and the collector of the fourth triode is connected to the first driving end.

[0014] In one embodiment, the first driving unit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a filter capacitor; The first end of the fifth resistor is connected to the power receiving end, the second end of the fifth resistor is connected to the first end of the sixth resistor, and the second end of the sixth resistor is connected to the emitter of the fourth transistor and the third driving end; the first end of the seventh resistor is connected to the second end of the fifth resistor, and the second end of the seventh resistor is connected to the base of the fourth transistor; the first end of the eighth resistor is connected to the second end of the fifth resistor, and the second end of the eighth resistor is connected to the fourth driving end; the first end of the ninth resistor is connected to the emitter of the third transistor, and the second end of the ninth resistor is connected to the first driving end; the first end of the filter capacitor is connected to the base of the third transistor, and the second end of the filter capacitor is connected to the emitter of the third transistor.

[0015] In order to solve the above technical problems, the second technical solution adopted by the present invention is: to provide an electronic device, comprising any of the above bidirectional driving circuits.

[0016] The present invention has the following beneficial effects: Different from the prior art, the bidirectional drive circuit and electronic device provided by the present invention include 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; when the current flowing through the protection unit is in a first direction, the first drive unit outputs a control signal to the protection unit to put the protection unit into an operating state; and when the current flowing through the protection unit is in a second direction, the second drive unit controls the first drive unit to output a control signal to the protection unit to put the protection unit into an operating state. The bidirectional drive circuit can control the protection circuit to be in an operating state when current flows in both the forward and reverse directions, allowing current to flow in both the forward and reverse directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the structure of a bidirectional driving circuit according to an embodiment of the present invention; Figure 2 FIG. 1 is a structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0020] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0021] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship. Furthermore, "many" in this document means two or more than two.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0023] Before further explaining the embodiments of the present application in detail, the nouns and terms involved in the embodiments of the present application are explained. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations.

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] The present invention provides a bidirectional drive circuit. It should be noted that the bidirectional drive circuit of the present application is a bidirectional DC-DC converter. This bidirectional DC-DC converter can realize forward and reverse current flow, thereby achieving bidirectional energy transfer between the input and output sides. Specifically, the bidirectional DC-DC converter of the present application can be applied to battery charging and discharging, energy storage systems (energy flows bidirectionally between energy storage devices and power grids / loads), etc.

[0026] See also Figure 1 , Figure 1This is a schematic diagram of the structure of an embodiment of a bidirectional drive circuit according to the present invention. The bidirectional drive circuit includes a protection unit 11, a first drive unit 12, and a second drive unit 13. The protection unit 11 is an ORing diode. The protection unit 11 is connected between the power supply terminal 2 and the load terminal 1. When the power supply terminal 2 supplies power to the load terminal 1, the current flows in a first direction. When the load terminal 1 is discharging power, the current flows in a second direction.

[0027] Specifically, the first drive unit 12 connects the protection unit 11 and the second drive unit 13. When the current flowing through the protection unit 11 is in a first direction (i.e., the power supply terminal 2 supplies power to the load terminal 1, defined as the current flow in the forward direction), the first drive unit 12 outputs a control signal to the protection unit 11, thereby placing the protection unit 11 in an operational state. Furthermore, when the current flowing through the protection unit is in a second direction (i.e., the load terminal 1 is discharging power, defined as the current flow in the reverse direction), the second drive unit 13 controls the first drive unit 12 to output a control signal to the protection unit 11, thereby placing the protection unit 11 in an operational state. Specifically, the protection unit 11 includes a first path terminal S1, a second path terminal D1, and a control terminal G1; the first drive unit 12 includes a first drive terminal S2, a second drive terminal D2, a third drive terminal G2, and a fourth drive terminal B; the first drive terminal S2 is connected to the first path terminal S1, the second drive terminal D2 is connected to the second path terminal D1, and the third drive terminal G2 is connected to the control terminal G1; the second drive unit 13 is connected to the fourth drive terminal B and the first drive terminal S2. In response to current flowing from the first path end S1 to the second path end D1, the current is in a first direction, and the first drive unit 12 outputs a control signal to the protection unit 11, placing the protection unit 11 in an active state. In response to current flowing from the second path end D1 to the first path end S1, the current is in a second direction, and the second drive unit 13 connects the fourth drive end B to the first drive end S2, causing the first drive unit 12 to output a control signal to the protection unit 11, thereby placing the protection unit 11 in an active state. It will be appreciated that when the protection unit 11 is in an active state, current can flow through the protection unit 11. In this way, regardless of whether the current is flowing in the first direction (forward) or the second direction (reverse), the protection unit 11 does not block the flow of current, allowing current to flow in both forward and reverse directions.

[0028] In one embodiment, the second drive unit 13 includes a control unit 131 and a switch unit 132. The control unit 131 is connected to the switch unit 132, which is connected to the fourth drive terminal B and the first drive terminal S2. In response to the current flowing in the first direction, i.e., the power supply terminal 2 supplies power to the load terminal 1, and the current flows from the first path terminal S1 to the second path terminal D1, the control unit 131 controls the switch unit 132 to be in an off state, disconnecting the fourth drive terminal B from the first drive terminal S2, causing the first drive unit 12 to output a control signal to the protection unit 11, thereby activating the protection unit 11. In response to the current flowing in the second direction, i.e., the load terminal 1 is discharging, and the current flows from the second path terminal D1 to the first path terminal S1, the control unit 131 controls the switch unit 132 to be in an on state, thereby connecting the fourth drive terminal B to the first drive terminal S2, causing the first drive unit 12 to output a control signal to the protection unit 11, thereby activating the protection unit 11.

[0029] Specifically, the control unit 131 includes: a first transistor T1, wherein the base of the first transistor T1 is connected to the driving port and receives 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. Furthermore, the control unit 131 also includes: a first resistor R1 and a second resistor R2; a first end of the first resistor R1 is connected to the driving port and receives the driving signal P, and a second end of the first resistor R1 is connected to the base of the first transistor T1; a first end of the second resistor R2 is connected to the second end of the first resistor R1, and a second end of the second resistor R2 is connected to the emitter of the first transistor T1.

[0030] In one embodiment, the switch unit 132 includes: a first transistor Q1, the first transistor Q1 includes a first pass end, a second pass end and a control end, the first pass end of the first transistor Q1 is connected to the fourth driving end B, the second pass 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.

[0031] Furthermore, the switching unit 132 also includes: 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 path end of the first transistor Q1.

[0032] In one embodiment, the first driving unit 12 includes: a second triode T2, a third triode T3, and a fourth triode T4, wherein the base of the second triode T2 is connected to the base of the third triode T3 and the fourth driving terminal B, the emitter of the second triode T2 is connected to the fourth driving terminal B, and the collector of the second triode T2 is connected to the second driving terminal D2; the emitter of the third triode T3 is connected to the first driving terminal S2, and the collector of the third triode T3 is connected to the base of the fourth triode T4; the emitter of the fourth triode T4 is connected to the power receiving terminal VCC and the third driving terminal G2, and the collector of the fourth triode T4 is connected to the first driving terminal S2.

[0033] Furthermore, the first driving unit 12 further includes: 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 to the power receiving terminal VCC, a second end of the fifth resistor R5 is connected to the first end of the sixth resistor R6, and a second end of the sixth resistor R6 is connected to the emitter of the fourth transistor T4 and the third driving terminal G2; a first end of the seventh resistor R7 is connected to the second end of the fifth resistor R5, and a second end of the seventh resistor R7 is connected to the base of the fourth transistor T4; a first end of the eighth resistor R8 is connected to the second end of the fifth resistor R5, and a second end of the eighth resistor R8 is connected to the fourth driving terminal B; a first end of the ninth resistor R9 is connected to the emitter of the third transistor T3, and a second end of the ninth resistor R9 is connected to the first driving terminal S2; a first end of the filter capacitor C is connected to the base of the third transistor T3, and a second end of the filter capacitor C is connected to the emitter of the third transistor T3.

[0034] It should be noted that the second transistor T2 and the third transistor T3 are NPN transistors, and the fourth transistor T4 is a PNP transistor. The eighth resistor R8 and the seventh resistor R7 have the same resistance value. The power receiving terminal 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.

[0035] When power supply terminal 2 supplies power to load terminal 1, current flows from first path terminal S1 to second path terminal D1 of protection unit 11. This current flow is defined as occurring in the first direction. Assuming the voltage between the gate (i.e., control terminal G1) and source (i.e., first path terminal S1) of protection unit 11 is zero, current flows through the body diode of protection unit 11, causing the drain voltage of protection unit 11 to be lower than the source voltage. Experimental data indicates this voltage is approximately 0.7V lower. Furthermore, because the bases of the second transistor T2 and the third transistor T3 are connected, the base voltage of the second transistor T2 is also approximately 0.7V higher than the collector voltage. Then, the base voltage of the third transistor T3 will not be higher than the emitter voltage, and the emitter and 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 base voltages of the fourth transistor T4 are equal. At this time, the emitter and collector of the fourth transistor T4 are also in a cut-off state, and the emitter remains in a high level state. The third driving terminal G2 also remains in a high level state. Since the control terminal G1 of the protection unit 11 is connected to the third driving terminal G2, the protection unit 11 is turned on, and the current of the power supply terminal 2 flows to the load terminal 1 through the protection unit 11. It can be understood that the protection unit 11 is an NMOS transistor, and its control terminal G1 is turned on when receiving a high level and is turned off when receiving a low level.

[0036] It should be noted that after the protection unit 11 is turned on, due to the internal resistance of the protection unit 11, current flows from the source to the drain, causing the source voltage to remain higher than the drain voltage, but the voltage difference between the two is very small. Furthermore, the base voltage of the third transistor T3 is slightly higher than the emitter voltage. However, the current limiting effect of the ninth resistor R9 minimizes the base current of the third transistor T3, resulting in a cutoff state between the emitter and collector of the third transistor T3, and the protection unit 11 remains turned on.

[0037] It is worth noting that when the current is in the first direction, the drive signal P is a low-level signal, the base of the first transistor T1 is a low-level signal, its emitter and collector are cut off, and the gate voltage of the first transistor Q1 is equal to the source voltage, and the first transistor Q1 is cut off.

[0038] When the load terminal 1 is discharged, the current flows from the second path terminal D1 of the protection unit 11 to the first path terminal 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 transistor T1 is a high-level signal, its emitter and collector are turned on, the control terminal voltage of the first transistor Q1 is pulled low, the first transistor Q1 is turned on, and the first path terminal and the second path terminal of the first transistor Q1 are connected. Since the first path terminal and the second path terminal of the first transistor Q1 are connected to the fourth driving terminal B and the first driving terminal S2 respectively, the fourth driving terminal B is connected to the first driving terminal S2. Since the first driving terminal S2 is connected to the first path terminal S1, the voltage of the fourth driving terminal B is clamped to 0V, that is, the second transistor T2 and the third transistor T The base voltage of the transistor 3 is clamped to 0V, resulting in the emitter and collector of the third transistor T3 being 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 base voltages of the fourth transistor T4 are equal. At this time, the emitter and 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 terminal G2 also remains in a high level state. Since the control terminal G1 of the protection unit 11 is connected to the third driving terminal G2, the protection unit 11 is turned on.

[0039] It should be noted that the first transistor Q1 is a PMOS transistor.

[0040] It should be noted that, without the second driving unit 13, when the current is in the second direction and the current flows from the second path end D1 to the first path end S1 of the protection unit 11, the drain voltage of the protection unit 11 is greater than the source voltage, that is, Vs < Vd, meeting the conduction condition, and the protection unit 11 conducts. 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 and base voltages of the second triode T2 are also low, and the base current of the third triode T3 is still not sufficient to make the third triode T3 in the conduction 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 and reaches a threshold value, the drain voltage value is sufficient to make the third triode T3 conduct, the emitter voltage of the third triode T3 is pulled down to a low level, the base voltage of the third triode T3 will be lower than the emitter, and the third triode T3 is also in the conduction state, and its emitter is also pulled down to a low level, so the gate voltage of the protection unit 11 is also pulled to a low level, and the protection unit 11 will turn off and the current will be cut off. After the current is cut off, the current drops to 0. 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 continues to remain in the off state. When the protection unit 11 encounters a current in the first direction again, the protection unit 11 can be turned on again. It can be seen that, without the second driving unit 13, as long as the current in the second direction reaches a certain value, the protection unit 11 will turn off, which affects the application of the bidirectional driving circuit. In this application, the second driving unit 13 is provided, and no matter how the current value in the second direction changes, the protection unit 11 can be made to be in the conduction state, without affecting the flow of the current. It can be understood that the bidirectional driving circuit of this application can control the protection circuit to be in the working state when the current flows forward and backward, so that the current can flow forward and backward.

[0041] See Figure 2 , which is a schematic structural diagram of an embodiment of the electronic device of the present invention. The electronic device 20 specifically includes a bidirectional driving circuit 21. The bidirectional driving circuit 21 is, 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 forward and backward, so that the current can flow forward and backward.

[0042] It can be understood that the electronic device of the present invention is, for example, a battery system, an energy storage system, etc., and is not specifically limited.

[0043] The above are only the embodiments of the present invention, and do not limit the patent protection scope of the present invention. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A bidirectional driving circuit, characterized in that: include: a protection unit, a first drive unit, and a second drive 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 to put the protection unit into a working state; And when the current flowing through the protection unit is in the 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 a working state.

2. The bidirectional driving circuit according to claim 1, wherein: The protection unit includes a first passage end, a second passage end, and a control end; the first driving unit includes 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; the second driving unit is connected to the fourth driving end and the first driving end; In response to current flowing from the first path end to the second path end, the current is in a first direction, and the first driving unit outputs the control signal to the protection unit; In response to current flowing from the second path end to the first path end, the current is in a 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.

3. The bidirectional driving circuit according to claim 2, wherein: The second driving unit includes: 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; In response to the current being in a first direction, the control unit controls the switch unit to be in an off state; in response to the current being in a second direction, the control unit controls the switch unit to be in an on state, thereby connecting the fourth drive end and the first drive end.

4. The bidirectional driving circuit according to claim 3, wherein: The control unit includes: a first transistor, wherein the base of the first transistor is used to connect to the driving port and receive the driving signal, the emitter of the first transistor is grounded, and the collector of the first transistor is connected to the switch unit.

5. The bidirectional driving circuit according to claim 4, characterized in that: The control unit also includes: a first resistor and a second resistor; the first end of the first resistor is connected to the driving port, and the second end of the first resistor is connected to the base of the first transistor; the first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is connected to the emitter of the first transistor.

6. The bidirectional driving circuit according to claim 3, wherein: The switch unit includes: a first transistor, including a first path end, a second path end and a control end, the first path end of the first transistor is connected to the fourth driving end, the second path end of the first transistor is connected to the first driving end, and the control end of the first transistor is connected to the control unit.

7. The bidirectional driving circuit according to claim 6, wherein: The switch unit includes: 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 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 the first path end of the first transistor.

8. The bidirectional driving circuit according to claim 3, wherein: The first driving unit includes: a second triode, a third triode and a fourth triode, the base of the second triode is connected to the base of the third triode and the fourth driving end, the emitter of the second triode is connected to the fourth driving end, and the collector of the second triode is connected to the second driving end; the emitter of the third triode is connected to the first driving end, and the collector of the third triode is connected to the base of the fourth triode; the emitter of the fourth triode is connected to the power receiving end and the third driving end, and the collector of the fourth triode is connected to the first driving end.

9. The bidirectional driving circuit according to claim 8, characterized in that: The first driving unit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a filter capacitor; The first end of the fifth resistor is connected to the power receiving end, the second end of the fifth resistor is connected to the first end of the sixth resistor, and the second end of the sixth resistor is connected to the emitter of the fourth transistor and the third driving end; the first end of the seventh resistor is connected to the second end of the fifth resistor, and the second end of the seventh resistor is connected to the base of the fourth transistor; the first end of the eighth resistor is connected to the second end of the fifth resistor, and the second end of the eighth resistor is connected to the fourth driving end; the first end of the ninth resistor is connected to the emitter of the third transistor, and the second end of the ninth resistor is connected to the first driving end; the first end of the filter capacitor is connected to the base of the third transistor, and the second end of the filter capacitor is connected to the emitter of the third transistor.

10. An electronic device, characterized in that: The bidirectional driving circuit comprises the bidirectional driving circuit according to any one of claims 1 to 9.

Images