Bridge type driving circuit

Abstract

The utility model discloses a bridge type driving circuit which comprises a first upper bridge arm driving circuit and a first lower bridge arm driving circuit, the first upper bridge arm driving circuit comprises a first horizontal displacement bootstrap circuit and a first enabling control circuit, and the first lower bridge arm driving circuit comprises a first push-pull driving circuit; the first enabling control circuit is connected with a first horizontal displacement bootstrap circuit, the first horizontal displacement bootstrap circuit is used for connecting a first upper bridge arm circuit, and the first upper bridge arm circuit is connected with an input voltage end; the first push-pull driving circuit is used for connecting a first lower bridge arm circuit, and the first lower bridge arm circuit is connected with the first upper bridge arm circuit and a load; the first upper bridge arm circuit and the first lower bridge arm circuit form a half-bridge topological structure. According to the bridge type driving circuit provided by the utility model, the enabling control circuit is added, so that the functions of frequency modulation and phase modulation can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of drive circuits, and more specifically to a bridge drive circuit. Background Art

[0002] Traditional technologies usually use pulse transformers and dedicated IC chips to drive the upper and lower arms of full bridges and half bridges. Among them, the output voltage of the pulse transformer changes with the duty cycle, which may cause the MOS transistors in the bridge circuit to be damaged due to the voltage of the drive circuit exceeding the maximum withstand voltage between the gate and the source. Therefore, the drive circuit composed of pulse transformers is only applicable to occasions where the duty cycle changes little; in the drive mode of dedicated ICs, all controls are decided and countermeasures are taken by the drive chip, and customized control strategies cannot be realized. In addition, neither the pulse transformer nor the dedicated IC chip directly provides a control function related to phase modulation, and the corresponding control part needs to provide the logic related to the phase modulation part and its implementation.

[0003] However, circuit systems using single-chip microcontrollers often need to implement phase-modulated power control. Although most general single-chip microcontrollers have the function of frequency modulation, they do not have the function of phase modulation. In the case where the drive circuit does not directly support the phase modulation function, it increases the design and use difficulty of using the single-chip microcontroller to control the upper and lower arms of the full bridge / half bridge, and reduces the flexibility of output power regulation. Summary of the Utility Model

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the utility model provides a bridge drive circuit, which adds an enable control circuit, can support the duty cycle of the conduction of the upper and lower arms to be less than 50%, and can realize the functions of frequency modulation and phase modulation.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a bridge drive circuit, including a first upper-arm drive circuit and a first lower-arm drive circuit. The first upper-arm drive circuit includes a first horizontal displacement bootstrap circuit and a first enable control circuit. The first lower-arm drive circuit includes a first push-pull drive circuit; the first enable control circuit is connected to the first horizontal displacement bootstrap circuit. The first horizontal displacement bootstrap circuit is used to connect to a first upper-arm circuit, and the first upper-arm circuit is connected to an input voltage terminal; the first push-pull drive circuit is used to connect to a first lower-arm circuit, and the first lower-arm circuit is respectively connected to the first upper-arm circuit and a load; the first upper-arm circuit and the first lower-arm circuit form a half-bridge topology structure.

[0006] The bridge drive circuit in the above technical solution is applicable to a half-bridge topology structure. The first horizontal displacement bootstrap circuit, the first enable control circuit and the first push-pull drive circuit are respectively connected to a single-chip microcontroller to receive the control signals of the single-chip microcontroller.

[0007] In a technical solution, the above-mentioned bridge drive circuit further includes a second upper-bridge-arm drive circuit and a second lower-bridge-arm drive circuit. The second upper-bridge-arm drive circuit includes a second horizontal-displacement bootstrap circuit and a second enable control circuit, and the second lower-bridge-arm drive circuit includes a second push-pull drive circuit. The second enable control circuit is connected to the second horizontal-displacement bootstrap circuit. The second horizontal-displacement bootstrap circuit is used to connect to a second upper-bridge-arm circuit, and the second upper-bridge-arm circuit is connected to the input voltage terminal. The second push-pull drive circuit is used to connect to a second lower-bridge-arm circuit, and the second lower-bridge-arm circuit is respectively connected to the second upper-bridge-arm circuit and the load. The first upper-bridge-arm circuit, the first lower-bridge-arm circuit, the second upper-bridge-arm circuit, and the second lower-bridge-arm circuit form a full-bridge topology structure. This technical solution adds a second upper-bridge-arm drive circuit and a second lower-bridge-arm drive circuit, which is applicable to the full-bridge topology structure.

[0008] In a technical solution, the first push-pull drive circuit includes a PWM1 input signal terminal, transistors TD1, TD2, TD4, TD5, and a lower-bridge-arm drive signal output terminal. Transistors TD1 and TD2 form a first push-pull circuit, and the output terminal of the first push-pull circuit is connected to the lower-bridge-arm drive signal output terminal. Transistors TD4 and TD5 form a delay circuit. One end of the delay circuit is connected to the PWM1 input signal terminal, and the other end is connected to the first push-pull circuit, which is used to ensure that the delays of the first upper-bridge-arm drive circuit and the first lower-bridge-arm drive circuit are the same. The circuit structure of the second push-pull drive circuit is the same as that of the first push-pull drive circuit.

[0009] In a technical solution, the first push-pull drive circuit further includes a transistor TD3. Transistor TD3 is arranged between the output terminal of the first push-pull circuit and the lower-bridge-arm drive signal output terminal, and is used to accelerate the turn-off of the first lower-bridge-arm circuit.

[0010] In a technical solution, the first horizontal-displacement bootstrap circuit includes a PWM1N input signal terminal, transistors TH1, TH2, TH4, TH5, and an upper-bridge-arm drive signal output terminal. Transistors TH1 and TH2 form a second push-pull circuit, and the output terminal of the second push-pull circuit is connected to the upper-bridge-arm drive signal output terminal. Transistors TH4 and TH5 form an enable control switch circuit. One end of the enable control switch circuit is connected to the PWM1N input signal terminal, and the other end is connected to the second push-pull circuit, which is used to control the second push-pull circuit. The circuit structure of the second horizontal-displacement bootstrap circuit is the same as that of the first horizontal-displacement bootstrap circuit.

[0011] In a technical solution, the first horizontal displacement bootstrap circuit further includes a triode TH3 and a capacitor CH1; the triode TH3 is disposed between the output end of the second push-pull circuit and the upper bridge arm driving signal output end for accelerating the turn-off of the first upper bridge arm circuit; the collector of the triode TH3 is connected to one side of the capacitor CH1.

[0012] In a technical solution, the first enabling control circuit includes an enabling control signal output end, a triode THA1 and a triode THA2; the base of the triode THA2 is connected to the enabling control signal output end through a resistor RHA1 and grounded through a resistor RHA2; the collector of the triode THA2 is connected to one end of a resistor RHA5, the other end of the resistor RHA5 is connected to the input voltage terminal Vin through a resistor RHA3 and connected to the base of the triode THA1 through a resistor RHA4; the emitter of the triode THA2 is grounded through a resistor RHA6; the emitter of the triode THA1 is connected to the input voltage terminal, and the triode THA1 is connected to the other side of the capacitor CH1 through a diode DHA1; the circuit structure of the second enabling control circuit is the same as that of the first enabling control circuit.

[0013] In a technical solution, the triodes TD1, TD3 and TD4 are PNP triodes, and the triodes TD2 and TD5 are NPN triodes. The triodes TH1, TH3 and TH4 are PNP triodes, and the triodes TH2 and TH5 are NPN triodes. The triode THA1 is a PNP triode, and the triode THA2 is an NPN triode.

[0014] As can be seen from the above technical solutions, compared with the prior art, the beneficial effects of the present invention are as follows: for a bridge drive circuit, the drive of the lower bridge arm adopts a push-pull drive circuit, and the drive of the upper bridge arm adopts a horizontal displacement bootstrap circuit with an enabling control function, making it possible to realize the phase modulation function; the control enabling signal can be used to enable full-bridge / half-bridge products to work reliably in a wide supply voltage environment, facilitating the cooperation with the single-chip microcomputer to control the upper and lower bridge arms of the full-bridge / half-bridge circuit, and realizing the frequency modulation and phase modulation functions according to the application scenario, so that the duty cycles of the conduction of the upper and lower bridge arms can be simultaneously less than 50%, thus ensuring the symmetry of the operation of relevant magnetic components and providing a flexible power adjustment method; the simple and reliable optimized initialization charging process of the bootstrap capacitor can also be realized through the single-chip microcomputer to ensure the normal and reliable operation of the horizontal displacement bootstrap circuit.

[0015] In addition, other advantages of the present invention will be given in the following description, some of which will become obvious from the following description or can be understood through the practice of the present invention. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0017] Figure 1 It is the structural framework diagram of the bridge drive circuit in an embodiment of the present invention;

[0018] Figure 2 It is the structural framework diagram of the bridge drive circuit in another embodiment of the present invention;

[0019] Figure 3 It is the circuit schematic diagram of the full-bridge topology structure in an embodiment of the present invention;

[0020] Figure 4 It is the circuit schematic diagram of the first push-pull drive circuit in the embodiment of the present invention;

[0021] Figure 5 It is the circuit schematic diagram of the first upper bridge arm drive circuit in the embodiment of the present invention;

[0022] Figure 6 It is the circuit schematic diagram of the first horizontal displacement bootstrap circuit in the embodiment of the present invention;

[0023] Figure 7 It is the circuit schematic diagram of the first enable control circuit in the embodiment of the present invention. Detailed implementation manners

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, in the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0026] Referring to Figures 1-7 Describe a bridge drive circuit according to an embodiment of the present utility model, which can be applied to the fields of wireless charging, heating and heat preservation, power supplies and chargers, and inverters with full-bridge / half-bridge topologies, and can also be applied to other products based on full-bridge / half-bridge topologies.

[0027] In one embodiment, as Figure 1 shown, a bridge drive circuit includes a first upper-bridge-arm drive circuit and a first lower-bridge-arm drive circuit. The first upper-bridge-arm drive circuit includes a first horizontal-displacement bootstrap circuit and a first enable control circuit, and the first lower-bridge-arm drive circuit includes a first push-pull drive circuit.

[0028] The first enable control circuit is connected to the first horizontal-displacement bootstrap circuit. The first horizontal-displacement bootstrap circuit is used to connect to a first upper-bridge-arm circuit, and the first upper-bridge-arm circuit is connected to an input voltage terminal.

[0029] The first push-pull drive circuit is used to connect to a first lower-bridge-arm circuit, and the first lower-bridge-arm circuit is respectively connected to the first upper-bridge-arm circuit and a load.

[0030] The first upper-bridge-arm circuit and the first lower-bridge-arm circuit form a half-bridge topology.

[0031] Among them, the first upper bridge arm circuit and the first lower bridge arm circuit form a common half-bridge topology structure in the prior art. Both the first upper bridge arm circuit and the first lower bridge arm circuit include MOS power tubes; the first horizontal displacement bootstrap circuit, the first enable control circuit, and the first push-pull drive circuit can be implemented using the common horizontal displacement bootstrap circuit, enable control circuit, and push-pull drive circuit structures in the prior art; the first horizontal displacement bootstrap circuit, the first enable control circuit, and the first push-pull drive circuit are all used to connect to a single-chip microcomputer. The first horizontal displacement bootstrap circuit and the first enable control circuit form a first upper bridge arm drive circuit, which is used to turn on or off the MOS power tube in the first upper bridge arm circuit according to the control signal of the single-chip microcomputer. The first push-pull drive circuit is used to turn on or off the MOS power tube in the first lower bridge arm circuit according to the control signal of the single-chip microcomputer, making it possible to realize the phase modulation function and providing a flexible power adjustment method.

[0032] In another embodiment, as Figure 2 shown, the above bridge drive circuit may further include a second upper bridge arm drive circuit and a second lower bridge arm drive circuit. The second upper bridge arm drive circuit includes a second horizontal displacement bootstrap circuit and a second enable control circuit, and the second lower bridge arm drive circuit includes a second push-pull drive circuit.

[0033] The second enable control circuit is connected to the second horizontal displacement bootstrap circuit. The second horizontal displacement bootstrap circuit is used to connect to a second upper bridge arm circuit, and the second upper bridge arm circuit is connected to the input voltage terminal.

[0034] The second push-pull drive circuit is used to connect to a second lower bridge arm circuit, and the second lower bridge arm circuit is respectively connected to the second upper bridge arm circuit and the load.

[0035] The first upper bridge arm circuit, the first lower bridge arm circuit, the second upper bridge arm circuit, and the second lower bridge arm circuit form a full-bridge topology structure.

[0036] In the above embodiment, the circuit structures of the second push-pull drive circuit and the first push-pull drive circuit are the same. The first push-pull drive circuit is used to drive the first lower bridge arm circuit, and the second push-pull drive circuit is used to drive the second lower bridge arm circuit; similarly, the circuit structures of the first horizontal displacement bootstrap circuit and the first enable control circuit are respectively the same as those of the second horizontal displacement bootstrap circuit and the second enable control circuit, and the circuit structures of the formed first upper bridge arm drive circuit and the second upper bridge arm drive circuit are also the same, which are respectively used to drive the first upper bridge arm circuit and the second upper bridge arm circuit.

[0037] Taking Figure 3Taking the full-bridge / half-bridge topology as an example, Vin is the input voltage that provides energy for the system, Q1, Q2, Q3, and Q4 are MOS power transistors. Among them, Q1 and Q2 form the upper arm of the full bridge, that is, the high-voltage side, also known as the high side; Q3 and Q4 form the lower arm of the full bridge, that is, the low-voltage side, also known as the low side. C1, C2, C3, and the inductor coil Coil2 form the load of this full-bridge circuit; R1, R2, R3, and R4 are the gate-source resistors of the MOS power transistors that make up the four bridge arms respectively; R0 is the sampling resistor.

[0038] The above bridge drive circuit can be divided into a low-side drive and a high-side drive. As Figures 1 to 3 shown, for Figure 3 the lower arm part of the bridge circuit in

[0039] is driven by a push-pull drive circuit, and the upper arm part is driven by a horizontal displacement bootstrap circuit through an enable control circuit, so that an ordinary single-chip microcomputer can also implement frequency modulation and phase modulation functions. Figure 4 In this embodiment, as

[0040] shown, the first push-pull drive circuit includes a PWM1 input signal terminal, a triode TD1, a triode TD2, a triode TD4, a triode TD5, and a lower-arm drive signal output terminal Driver1; the triode TD1 and the triode TD2 form a first push-pull circuit, and the output terminal of the first push-pull circuit is connected to the lower-arm drive signal output terminal Driver1; the triode TD4 and the triode TD5 form a delay circuit, one end of the delay circuit is connected to the PWM1 input signal terminal, and the other end is connected to the first push-pull circuit, which is used to ensure that the delay of the first upper-arm drive circuit and the first lower-arm drive circuit is the same. Among them, the PWM1 input signal terminal is used to receive the PWM1 input signal.

[0041] The second push-pull drive circuit has the same circuit structure as the first push-pull drive circuit.

[0042] In the above embodiment, the lower arm part is driven by a push-pull drive circuit. As Figure 4As shown, Vdr is the supply voltage of the control circuit. The bases of transistor TD1 and transistor TD2 are connected and connected to one end of resistor RD1; the other end of resistor RD1 is connected to the collector of transistor TD4, grounded through resistor RD11, connected to the emitter of transistor TD1 through resistor RD2, and connected to the base of transistor TD3 through resistor RD4; the emitter of transistor TD3 is connected to the lower bridge arm drive signal output terminal Driver1, and the collector of transistor TD3 is grounded; the emitters of transistor TD1 and transistor TD2 are connected and connected to the lower bridge arm drive signal output terminal Driver1 through resistor RD3; the collector of transistor TD1 is grounded, and the collector of transistor TD2 is connected to the supply voltage; the emitter of transistor TD4 is connected to the supply voltage, the base of transistor TD4 is connected to one end of resistor RD8, the other end of resistor RD8 is connected to the collector of transistor TD5 through resistor RD9, and connected to the supply voltage through resistor RD10; the base of transistor TD5 is connected to the PWM1 input signal terminal through resistor RD5, grounded through resistor RD6, and the emitter of transistor TD5 is grounded through resistor RD7.

[0043] In this embodiment, transistor TD1, transistor TD3, and transistor TD4 are PNP transistors, and transistor TD2 and transistor TD5 are NPN transistors.

[0044] Among them, transistor TD1 and transistor TD2 form a first push-pull circuit to ensure that control signals such as single-chip microcomputers can reliably and quickly turn on or off the low-side MOS transistor, that is, constitute the lower bridge arm drive circuit; the addition of transistor TD4 and transistor TD5 is to consider the delay caused by the complex upper bridge arm drive circuit, and specifically add the corresponding delay of the simple low-side drive circuit to ensure that the delays of the upper and lower bridge arm drive circuits are consistent; transistor TD3 is used to accelerate the turn-off of the lower bridge arm.

[0045] During specific implementation, when the PWM1 input signal is at a high level, transistor TD5 and transistor TD4 are turned on, and the push-pull drive circuit drives the low-side MOS transistor Q3 to turn on; when the PWM1 input signal is at a low level, transistor TD5 and transistor TD4 are turned off, and the push-pull drive circuit drives the low-side MOS transistor Q3 to turn off.

[0046] In this embodiment, as Figure 5 and Figure 6As shown, the first horizontal displacement bootstrap circuit includes a PWM1N input signal terminal, transistor TH1, transistor TH2, transistor TH4, transistor TH5, and an upper bridge arm drive signal output terminal Driver1N; transistor TH1 and transistor TH2 form a second push-pull circuit, and the output terminal of the second push-pull circuit is connected to the upper bridge arm drive signal output terminal Driver1N; transistor TH4 and transistor TH5 form an enable control switch circuit, one end of the enable control switch circuit is connected to the PWM1N input signal terminal, and the other end is connected to the second push-pull circuit for controlling the second push-pull circuit; wherein, the PWM1N input signal terminal is used to receive the PWM1N signal.

[0047] The circuit structure of the second horizontal displacement bootstrap circuit is the same as that of the first horizontal displacement bootstrap circuit.

[0048] In this embodiment, the first horizontal displacement bootstrap circuit further includes transistor TH3 and capacitor CH1; transistor TH3 is arranged between the output terminal of the second push-pull circuit and the upper bridge arm drive signal output terminal Driver1N for accelerating the turn-off of the first upper bridge arm circuit; the collector of transistor TH3 is connected to one side of capacitor CH1.

[0049] Among them, transistor TH1, transistor TH3, and transistor TH4 are PNP transistors, and transistor TH2 and transistor TH5 are NPN transistors.

[0050] In the above embodiment, the upper bridge arm drive circuit is divided into two parts: a horizontal displacement bootstrap circuit and an enable control circuit, and the output of the horizontal displacement bootstrap circuit adopts a push-pull structure. As Figure 5 and Figure 6As shown, Vdr is the supply voltage of the control circuit, and Floating_Point is the floating voltage at the connection of the upper and lower bridge arm MOS transistors. The anode of diode DH1 is connected to the supply voltage through resistor RH12, and the cathode is directly connected to the supply voltage; the emitters of transistor TH1 and transistor TH2 are connected and connected to the upper bridge arm drive signal output terminal Driver1N through resistor RH3. The collector of transistor TH2 is connected to the supply voltage, and the collector of transistor TH1 is connected to the floating voltage; the bases of transistor TH1 and transistor TH2 are connected and connected to one end of resistor RH1; the other end of resistor RH1 is connected to the collector of transistor TH4, grounded through resistor RH11, connected to the emitter of transistor TH1 through resistor RH2, and connected to the base of transistor TH3 through resistor RH4; the emitter of transistor TH3 is connected to the upper bridge arm drive signal output terminal Driver1N, and the collector of transistor TH3 is connected to the floating voltage; the emitter of transistor TH4 is connected to the supply voltage, the base of transistor TH4 is connected to one end of resistor RH8, the other end of resistor RH8 is connected to the collector of transistor TH5 through resistor RH9, and connected to the supply voltage through resistor RH10; the base of transistor TH5 is connected to the PWM1N input signal terminal through resistor RH5, grounded through resistor RH6, and the emitter of transistor TH5 is connected to the supply voltage through resistor RH7.

[0051] In this embodiment, as Figure 5 and Figure 7 shown, the first enable control circuit includes an enable control signal output terminal, transistor THA1 and transistor THA2; the base of transistor THA2 is connected to the enable control signal output terminal through resistor RHA1 and grounded through resistor RHA2; the collector of transistor THA2 is connected to one end of resistor RHA5, the other end of resistor RHA5 is connected to the input voltage terminal Vin through resistor RHA3 and connected to the base of transistor THA1 through resistor RHA4; the emitter of transistor THA2 is grounded through resistor RHA6; the emitter of transistor THA1 is connected to the input voltage terminal Vin, and the collector of transistor THA1 is connected to the other side of capacitor CH1 through diode DHA1 and grounded through resistor RHA7;

[0052] The second enable control circuit has the same circuit structure as the first enable control circuit.

[0053] Among them, the enable control signal output terminal is used to output the enable control signal PWM1N_Aux. Transistors TH4 and TH5 form an enable control switch circuit to control the second push-pull circuit composed of transistors TH1 and TH2.

[0054] During specific implementation, when the enable control signal PWM1N_Aux is at a low level, it is in the off state. Regardless of the level of the PWM1N signal, the second push-pull circuit composed of the triode TH1 and the triode TH2 is in the cut-off state, and the MOS tube in the upper bridge arm is in the off state; when the enable control signal PWM1N_Aux is at a high level and the PWM1N signal is at a high level, the second push-pull circuit composed of the triode TH1 and the triode TH2 is in the conducting state, and the MOS tube in the upper bridge arm is in the conducting state.

[0055] In this embodiment, the triode THA1 is a PNP triode, and the triode THA2 is an NPN triode. During specific implementation, the enable control signal PWM1N_Aux controls / locks the conduction of the upper bridge arm. When the enable control signal PWM1N_Aux is at a high level, the PWM1N signal is allowed to turn on the conduction of the MOS in the upper bridge arm. Through the above first enable control circuit and second enable control circuit, a general single-chip microcomputer can complete the phase modulation function, providing a circuit basis for the realization of customized functions.

[0056] The other components and operations of the bridge drive circuit according to the embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

[0057] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0058] In the description of this specification, the descriptions referring to terms such as "embodiment", "specific embodiment", "example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention.

[0059] In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples without interference or contradiction.

Claims

1. A bridge drive circuit, characterized in that: It includes a first upper-bridge-arm driving circuit and a first lower-bridge-arm driving circuit. The first upper-bridge-arm driving circuit includes a first horizontal-displacement bootstrap circuit and a first enabling control circuit, and the first lower-bridge-arm driving circuit includes a first push-pull driving circuit; The first enabling control circuit is connected to the first horizontal-displacement bootstrap circuit. The first horizontal-displacement bootstrap circuit is used to connect to a first upper-bridge-arm circuit, and the first upper-bridge-arm circuit is connected to an input voltage terminal; The first push-pull driving circuit is used to connect to a first lower-bridge-arm circuit, and the first lower-bridge-arm circuit is respectively connected to the first upper-bridge-arm circuit and a load; The first upper-bridge-arm circuit and the first lower-bridge-arm circuit form a half-bridge topology structure.

2. The bridge drive circuit according to claim 1, wherein: It further includes a second upper-bridge-arm driving circuit and a second lower-bridge-arm driving circuit. The second upper-bridge-arm driving circuit includes a second horizontal-displacement bootstrap circuit and a second enabling control circuit, and the second lower-bridge-arm driving circuit includes a second push-pull driving circuit; The second enabling control circuit is connected to the second horizontal-displacement bootstrap circuit. The second horizontal-displacement bootstrap circuit is used to connect to a second upper-bridge-arm circuit, and the second upper-bridge-arm circuit is connected to the input voltage terminal; The second push-pull driving circuit is used to connect to a second lower-bridge-arm circuit, and the second lower-bridge-arm circuit is respectively connected to the second upper-bridge-arm circuit and the load; The first upper-bridge-arm circuit, the first lower-bridge-arm circuit, the second upper-bridge-arm circuit and the second lower-bridge-arm circuit form a full-bridge topology structure.

3. The bridge drive circuit according to claim 2, characterized in that: The first push-pull driving circuit includes a PWM1 input signal terminal, a triode TD1, a triode TD2, a triode TD4, a triode TD5 and a lower-bridge-arm driving signal output terminal; The triode TD1 and the triode TD2 form a first push-pull circuit, and the output terminal of the first push-pull circuit is connected to the lower-bridge-arm driving signal output terminal; The triode TD4 and the triode TD5 form a delay circuit. One end of the delay circuit is connected to the PWM1 input signal terminal, and the other end is connected to the first push-pull circuit, which is used to ensure that the delay of the first upper-bridge-arm driving circuit and the first lower-bridge-arm driving circuit is consistent; The circuit structure of the second push-pull driving circuit is the same as that of the first push-pull driving circuit.

4. The bridge drive circuit according to claim 3, wherein: The first push-pull driving circuit further includes a triode TD3; The triode TD3 is arranged between the output terminal of the first push-pull circuit and the lower-bridge-arm driving signal output terminal, which is used to accelerate the turn-off of the first lower-bridge-arm circuit.

5. The bridge drive circuit according to claim 4, characterized in that: The first horizontal-displacement bootstrap circuit includes a PWM1N input signal terminal, a triode TH1, a triode TH2, a triode TH4, a triode TH5 and an upper-bridge-arm driving signal output terminal; The triode TH1 and the triode TH2 form a second push-pull circuit, and the output terminal of the second push-pull circuit is connected to the upper-bridge-arm driving signal output terminal; The triode TH4 and the triode TH5 form an enabling control switch circuit. One end of the enabling control switch circuit is connected to the PWM1N input signal terminal, and the other end is connected to the second push-pull circuit, which is used to control the second push-pull circuit; The circuit structure of the second horizontal displacement bootstrap circuit is the same as that of the first horizontal displacement bootstrap circuit.

6. The bridge drive circuit according to claim 5, wherein: The first horizontal displacement bootstrap circuit further includes a triode TH3 and a capacitor CH1; the triode TH3 is disposed between the output end of the second push-pull circuit and the upper bridge arm drive signal output end for accelerating the turn-off of the first upper bridge arm circuit; the collector of the triode TH3 is connected to one side of the capacitor CH1.

7. The bridge drive circuit according to claim 6, wherein: The first enable control circuit includes an enable control signal output end, a triode THA1, and a triode THA2; The base of the triode THA2 is connected to the enable control signal output end through a resistor RHA1 and grounded through a resistor RHA2; the collector of the triode THA2 is connected to one end of a resistor RHA5, the other end of the resistor RHA5 is connected to the input voltage terminal Vin through a resistor RHA3 and connected to the base of the triode THA1 through a resistor RHA4; the emitter of the triode THA2 is grounded through a resistor RHA6; The emitter of the triode THA1 is connected to the input voltage terminal, and the triode THA1 is connected to the other side of the capacitor CH1 through a diode DHA1; The circuit structure of the second enable control circuit is the same as that of the first enable control circuit.

8. The bridge drive circuit according to claim 4, wherein: The triode TD1, the triode TD3, and the triode TD4 are PNP triodes, and the triode TD2 and the triode TD5 are NPN triodes.

9. The bridge drive circuit according to claim 6, wherein: The triode TH1, the triode TH3, and the triode TH4 are PNP triodes, and the triode TH2 and the triode TH5 are NPN triodes.

10. The bridge drive circuit according to claim 7, characterized in that: The triode THA1 is a PNP triode, and the triode THA2 is an NPN triode.

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