Battery driving circuit, chip and module

Abstract

The utility model discloses a battery driving circuit, a chip and a module, the battery driving circuit comprises a battery driving chip, and the battery driving chip comprises a first controller and a second controller; the first controller is configured to generate two pulse signals or two complementary PWM signals according to the PWM signals, and then the two pulse signals or the two complementary PWM signals are output through the first output end and the second output end respectively. The second controller is configured to generate a floating PWM signal according to the two pulse signals or the two complementary PWM signals and output the floating PWM signal through a third output end; and the driving module is configured to generate a floating driving signal according to the floating PWM signal and output the floating driving signal through the floating driving output end so as to drive the switch unit to be switched on or switched off. The process of generating the floating driving signal based on the PWM signal is simple and easy to control, meanwhile, the power consumption of each circuit element is small, and the overall size is small and compact.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery equalization, and in particular to a battery driving circuit, a chip and a module. BACKGROUND

[0002] With the popularity of portable electronic devices and the rise of applications such as electric vehicles, battery driving chip technology has developed rapidly. Traditional battery driving circuits are usually implemented using optocouplers or transformers. However, using an optocoupler scheme often results in high power consumption. At the same time, using a transformer scheme brings problems such as complex control, large size and high cost. CONTENT OF THE INVENTION

[0003] The purpose of the present application is to provide a battery driving circuit, a chip and a module to solve the technical problems of high power consumption and complex control of existing battery driving circuits in the prior art. The preferred technical solutions in the many technical solutions provided by the present application can produce many technical effects, which are described in detail below.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0005] In a first aspect, the present application provides a battery driving circuit, comprising: a battery driving chip, the battery driving chip comprising a first controller and a second controller; the first controller comprising a control signal input end, a first output end and a second output end, the first controller being configured to generate two pulse signals or two complementary PWM signals according to a PWM signal from the control signal input end, and then output through the first output end and the second output end respectively; the second controller comprising a first input end, a second input end and a third output end, the first input end being coupled with the first output end, the second input end being coupled with the second output end, the second controller being configured to generate a floating PWM signal according to the two pulse signals or the two complementary PWM signals and output through the third output end; and a driving module, one end of the driving module being coupled with the third output end, the other end of the driving module being coupled with a floating driving output end of the battery driving circuit, the driving module being configured to generate a floating driving signal according to the floating PWM signal and output through the floating driving output end to drive a switching unit to turn on or turn off.

[0006] In some embodiments, the first controller comprises a pulse generator, the pulse generator being coupled with the control signal input end, the first output end and the second output end, the pulse generator being configured to generate the two pulse signals according to rising and falling edges of the PWM signal from the control signal input end and output through the first output end and the second output end respectively.

[0007] In some embodiments, the second controller comprises a flip-flop, one end of the flip-flop is coupled to the first input end and the second input end, the other end of the flip-flop is coupled to the third output end, the flip-flop is configured to generate the floating PWM signal according to the two pulse signals and output the floating PWM signal through the third output end.

[0008] In some embodiments, the first controller comprises a complementer, the complementer is coupled to the control signal input end, the first output end and the second output end, the complementer is configured to generate the two complementary PWM signals according to the PWM signal from the control signal input end and output the two complementary PWM signals through the first output end and the second output end respectively.

[0009] In some embodiments, the second controller comprises a logic circuit, one end of the logic circuit is coupled to the first input end and the second input end, the other end of the logic circuit is coupled to the third output end, the logic circuit is configured to generate the floating PWM signal according to the two complementary PWM signals and output the floating PWM signal through the third output end.

[0010] In some embodiments, the battery driving circuit comprises a floating power supply end and a floating ground end for providing a floating voltage; the second controller and the driving module are both coupled to the floating power supply end and the floating ground end.

[0011] In some embodiments, the first controller comprises a first NMOS transistor and a second NMOS transistor; the gates of the first NMOS transistor and the second NMOS transistor are both coupled to the pulse generator, the sources of the first NMOS transistor and the second NMOS transistor are both coupled to a ground end, the drain of the first NMOS transistor is coupled to the first output end, the drain of the second NMOS transistor is coupled to the second output end; the first controller generates the two pulse signals at the drain of the first NMOS transistor and the drain of the second NMOS transistor and outputs the two pulse signals through the first output end and the second output end respectively.

[0012] In some embodiments, the battery driving circuit comprises a power supply converter; one end of the power supply converter is connected to a power supply end of the battery driving circuit, the other end of the power supply converter is connected to the second controller and the floating voltage end; the power supply converter is an LDO stabilizer, or a combination of the LDO stabilizer and a JFET device, or a plurality of series resistors.

[0013] In some embodiments, the driving module comprises a pre-driver and a driver; one end of the pre-driver is coupled to the second controller, the other end of the pre-driver is coupled to one end of the driver, and one end of the driver is coupled to the floating driving output end; the pre-driver generates a pre-driving signal according to a floating PWM signal from the second controller and transmits the pre-driving signal to the driver; and the driver generates the floating driving signal according to the pre-driving signal from the pre-driver and outputs the floating driving signal through the floating driving output end.

[0014] In some embodiments, the driver comprises a third NMOS tube and a first PMOS tube; the third NMOS tube and the first PMOS tube are connected in common gate and connected to the pre-driver; the source of the third NMOS tube is coupled to the floating ground end; the source of the first PMOS tube is coupled to the floating power supply end, and the drain of the first PMOS tube is connected to the drain of the third NMOS tube and the floating driving output end.

[0015] In some embodiments, the battery driving circuit further comprises a clamping device, one end of the clamping device is coupled to the floating power supply end, and the other end of the clamping device is coupled to the floating ground end.

[0016] In some embodiments, the clamping device comprises at least one diode and / or at least one triode and / or at least one MOS tube and / or at least one voltage stabilizing tube.

[0017] In some embodiments, the second controller comprises a first load resistor and a second load resistor, one end of the first load resistor is connected to one end of the second load resistor and the floating power supply end, the other end of the first load resistor is connected to a flip-flop and the first input end, and the other end of the second load resistor is connected to the flip-flop and the second input end.

[0018] In some embodiments, the second controller comprises a fourth NMOS tube and a second PMOS tube; the drain of the fourth NMOS tube and the source of the second PMOS tube are connected to the floating power supply end, the source of the fourth NMOS tube is connected to the first input end, the gate of the second PMOS tube, and a logic circuit, the drain of the second PMOS tube is connected to the second input end, the gate of the fourth NMOS tube, and the logic circuit.

[0019] In a second aspect, the application provides a battery driving chip for the battery driving circuit as described above, the battery driving chip comprising a first controller and a second controller; the first controller comprising a control signal input end, a first output end and a second output end, the first controller being configured to generate two pulse signals or two complementary PWM signals according to a PWM signal from the control signal input end and then output the two pulse signals or the two complementary PWM signals through the first output end and the second output end respectively; the second controller comprising a first input end, a second input end and a third output end, the first input end being coupled with the first output end, the second input end being coupled with the second output end, the second controller being configured to generate a floating PWM signal according to the two pulse signals or the two complementary PWM signals and output the floating PWM signal through the third output end.

[0020] In a third aspect, the application provides a battery switch driving module, comprising a driving array and a switch array, the driving array comprising a plurality of battery driving circuits as described above, the switch array comprising a plurality of switch units, one of the battery driving circuits being connected with a bidirectional converter through one of the switch units, another of the battery driving circuits being connected with a battery of a battery pack through another of the switch units; the battery driving circuit generating a floating driving signal according to a received PWM signal, the switch unit being turned on or turned off according to a received floating driving signal to turn on or turn off a current path between one or more batteries of the battery pack and the bidirectional converter to adjust the charging and discharging of the batteries in the battery pack.

[0021] The implementation of one of the technical solutions in the application has the following advantages or beneficial effects: in the application, the first controller processes the PWM signal to generate pulse signals or complementary PWM signals, the second controller processes the pulse signals or the complementary PWM signals to obtain a floating PWM signal, and finally the driving module processes the floating PWM signal to obtain a floating driving signal for driving the switch unit. Thus, the application is simple and easy to control in the process of generating the floating driving signal based on the PWM signal, and the power consumption of each circuit element is small, and the overall volume is small and compact. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings. In the drawings:

[0023] Figure 1 is a structural schematic diagram of the battery driving circuit of the embodiment of the application;

[0024] Figure 2 is a circuit schematic diagram of a battery driving circuit of an embodiment of the present application;

[0025] Figure 3 is a waveform schematic diagram of various signals of an embodiment of the present application;

[0026] Figure 4 is another circuit schematic diagram of a battery driving circuit of an embodiment of the present application;

[0027] Figure 5 is another waveform schematic diagram of various signals of an embodiment of the present application;

[0028] Figure 6 is a schematic diagram of a driver of an embodiment of the present application;

[0029] Figure 7 is a schematic diagram of a clamper of an embodiment of the present application.

[0030] In the drawings: 1, battery driving circuit; 10, battery driving chip; 20, driving module; 100, first controller; 110, second controller; 101, pulse generator; 111, flip-flop; 102, inverter; 112, logic circuit; 30, power supply converter; 200, pre-driver; 210, driver; 40, clamper. DETAILED DESCRIPTION

[0031] In order to make the objects, technical solutions and advantages of the present application clearer, the various exemplary embodiments to be described below will be described with reference to the corresponding drawings, which form a part of the exemplary embodiments, and various exemplary embodiments that can be used to implement the present application are described. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation described in the following exemplary embodiments does not represent all the implementations consistent with the present disclosure. It should be understood that they are only examples of processes, methods and apparatuses, etc. consistent with some aspects of the present disclosure as detailed in the appended claims, and other embodiments can be used, or structural and functional modifications can be made to the embodiments listed herein, without departing from the scope and spirit of the present application.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse" and the like indicate the orientation or positional relationship based on the drawings shown, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the elements referred to must have a particular orientation, be constructed and operated in a particular orientation. The terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "a plurality of" means two or more. The terms "connected", "connected" should be broadly understood, for example, it can be fixed connection, detachable connection, integral connection, mechanical connection, electrical connection, communication connection, direct connection, indirect connection through intermediate medium, internal communication of two elements or interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more related listed items. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In order to illustrate the technical solutions described in the present application, the following will be described by specific examples, only showing the parts related to the embodiments of the present application.

[0034] The present application provides a battery driving circuit 1. The battery driving circuit 1 can be used to generate a floating driving signal for driving a switching unit according to the received PWM signal. The switching unit can be turned on or turned off according to the high and low level and the duration of the floating driving signal. The battery driving circuit 1 of the present application controls the steps of turning on or turning off the switching unit simply.

[0035] In some embodiments, as shown in Figure 1 The battery driving circuit 1 can include a battery driving chip 10 and a driving module 20. The battery driving chip 10 can be used to generate a floating PWM signal FPWM according to the received PWM signal, and the driving module 20 can generate a floating driving signal according to the floating PWM signal FPWM, wherein the floating driving signal can be used to drive the switching unit to turn on or turn off the switching unit.

[0036] In some embodiments, the switching element can be connected with the bidirectional converter and the battery pack. Specifically, the battery driving circuit 1 can be connected with the switching element, and the switching element can be connected between the bidirectional converter and the battery pack. Thus, the current path between the bidirectional converter and the battery pack can be controlled according to the PWM signal to charge and discharge any battery in the battery pack, and the equalization management of the battery pack can be realized.

[0037] In some embodiments, the battery driving chip 10 can include a first controller 100 and a second controller 110.

[0038] In some embodiments, the first controller 100 may include a power supply input terminal VCC, a control signal input terminal PWM, a ground terminal GND, a first output terminal R1, and a second output terminal S1. The first controller 100 may be configured to generate two pulse signals PULSE_R2 and PULSE_S2 or two complementary PWM signals FPWM2_N and FPWM2 based on the PWM signal from the control signal input terminal, and then output them through the first output terminal R1 and the second output terminal S1, respectively.

[0039] In some embodiments, the power input terminal VCC can be used to receive the power supply voltage Vcc, and the power input terminal VCC can be connected to an external power supply device. The power supply voltage Vcc can be 3 volts or 5.5 volts.

[0040] In some embodiments, the control signal input terminal PWM can be used to receive PWM signals, and the control signal input terminal PWM can be connected to an external microcontroller chip, timer, or PWM generator.

[0041] In some embodiments, such as Figure 2 As shown, the first controller 100 may include a pulse generator 101. The pulse generator 101 may be coupled to the control signal input terminal PWM, the first output terminal R1, and the second output terminal S1. The pulse generator 101 may be configured to generate two pulse signals PULSE_R2 and PULSE_S2 according to the rising and falling edges of the PWM signal from the control signal input terminal, and output them through the first output terminal R1 and the second output terminal S1, respectively.

[0042] In some embodiments, the second controller 110 may include a flip-flop 111, one end of which may be coupled to a first input terminal R2 and a second input terminal S2, and the other end of which may be coupled to a third output terminal S3, such as... Figure 3 As shown, the trigger 111 can be configured to generate a floating PWM signal FPWM based on two pulse signals PULSE_R2 and PULSE_S2 and output it through the third output terminal S3.

[0043] In other embodiments, such as Figure 4 As shown, the first controller 100 may include a complementer 102, which may be coupled to the control signal input terminal PWM, the first output terminal R1, and the second output terminal S1, as shown. Figure 5 As shown, the complementer 102 can be configured to generate two complementary PWM signals FPWM2_N and FPWM2 based on the PWM signal from the control signal input terminal PWM, and output them through the first output terminal R1 and the second output terminal S1, respectively.

[0044] In some embodiments, the first controller 100 can include a first NMOS transistor M4 and a second NMOS transistor M3. The gates of the first NMOS transistor M4 and the second NMOS transistor M3 can be coupled to the pulse generator 101, the sources of the first NMOS transistor M4 and the second NMOS transistor M3 can be coupled to the ground terminal GND, the drain of the first NMOS transistor M4 can be coupled to the first output terminal R1, and the drain of the second NMOS transistor M3 can be coupled to the second output terminal S1. The first controller 100 can generate two pulse signals PULSE_R2, PULSE_S2 at the drain of the first NMOS transistor M4 and the drain of the second NMOS transistor M3, and output the two pulse signals PULSE_R2, PULSE_S2 via the first output terminal R1 and the second output terminal S1, respectively.

[0045] In some embodiments, the pulse generator 101 can generate two pulse output signals PULSE_R1, PULSE_S1 according to the PWM signal, one pulse output signal PULSE_R1 as an input signal to the gate of the first NMOS transistor M4, and the other pulse output signal PULSE_S1 as an input signal to the gate of the second NMOS transistor M3. The pulse output signal at the gate of the first NMOS transistor M4 or the second NMOS transistor M3 can be inverted from the pulse signal at the corresponding drain.

[0046] In some embodiments, the pulse generator 101 can generate two pulse output signals PULSE_R1, PULSE_S1 according to the PWM signal, one pulse output signal PULSE_R1 as an input signal to the gate of the first NMOS transistor M4, and the other pulse output signal PULSE_S1 as an input signal to the gate of the second NMOS transistor M3. The pulse output signal at the gate of the first NMOS transistor M4 or the second NMOS transistor M3 can be inverted from the pulse signal at the corresponding drain.

[0047] In some embodiments, the pulse generator 101 can generate two pulse output signals PULSE_R1, PULSE_S1 according to the PWM signal, one pulse output signal PULSE_R1 as an input signal to the gate of the first NMOS transistor M4, and the other pulse output signal PULSE_S1 as an input signal to the gate of the second NMOS transistor M3. The pulse output signal at the gate of the first NMOS transistor M4 or the second NMOS transistor M3 can be inverted from the pulse signal at the corresponding drain.

[0048] In some embodiments, the second controller 110 can include a first input terminal R2, a second input terminal S2, and a third output terminal S3, the first input terminal R2 coupled to the first output terminal R1, and the second input terminal S2 coupled to the second output terminal S1. The second controller 110 can be configured to generate a floating PWM signal FPWM according to two pulse signals or two complementary PWM signals and output the floating PWM signal FPWM via the third output terminal S3.

[0049] In some embodiments, one end of the drive module 20 can be coupled to the third output terminal S3, and the other end of the drive module 20 can be coupled to the floating drive output terminal FGDO of the battery drive circuit 1. The drive module 20 can be configured to generate a floating drive signal according to the floating PWM signal FPWM and output it through the floating drive output terminal FGDO.

[0050] In some embodiments, the battery drive circuit 1 may include a floating power supply terminal FVCC and a floating ground terminal FGND for providing a floating voltage. The second controller 110 and the drive module 20 are both coupled to the floating power supply terminal FVCC and the floating ground terminal FGND. The floating power supply terminal FVCC may be connected to an external boost module to receive a boost voltage higher than the Vcc power supply voltage.

[0051] In some embodiments, the battery drive circuit 1 may include a power converter 30. One end of the power converter 30 may be connected to the power supply terminal VH of the battery drive circuit 1, and the other end of the power converter 30 may be connected to both the second controller 110 and the floating voltage terminal FVCC. The power converter 30 may be an LDO regulator, a combination of an LDO regulator and a JFET device, or multiple resistors connected in series.

[0052] In some embodiments, the power converter 30 may be built into or externally located in the battery driver chip 10.

[0053] In some embodiments, the drive module 20 may include a pre-driver 200 and a driver 210. One end of the pre-driver 200 may be coupled to the second controller 110, and the other end of the pre-driver 200 may be coupled to one end of the driver 210. One end of the driver 210 may be coupled to a floating drive output terminal FGDO. The pre-driver 200 may generate a pre-drive signal based on the floating PWM signal FPWM from the second controller 110 and transmit the pre-drive signal to the driver 210; the driver 210 may generate a floating drive signal based on the pre-drive signal from the pre-driver 200 and output it through the floating drive output terminal FGDO.

[0054] In some embodiments, such as Figure 6 As shown, the driver 210 may include a third NMOS transistor M30 and a first PMOS transistor M40. The third NMOS transistor M30 and the first PMOS transistor M40 share a common gate and are connected to the pre-driver 200; the source of the third NMOS transistor M30 is coupled to the floating ground terminal FGND; the source of the first PMOS transistor M40 is coupled to the floating power supply terminal FVCC, and the drain of the first PMOS transistor M40 is connected to the drain of the third NMOS transistor M30 and the floating drive output terminal FGDO.

[0055] In some embodiments, the battery driving circuit 1 can further comprise a voltage clamping device 40, one end of which can be coupled to the floating power supply end FVCC, and the other end of which can be coupled to the floating ground end FGND.

[0056] In some embodiments, the voltage clamping device 40 can be built-in or external to the battery driving chip 10.

[0057] In some embodiments, as shown in FIG. 4, the voltage clamping device 40 can comprise at least one diode and / or at least one triode and / or at least one MOS tube and / or at least one Zener diode. Specifically, the voltage clamping device 40 can be a voltage clamping device comprising at least one diode; or the voltage clamping device 40 can be a voltage clamping device comprising at least one triode, wherein the at least one triode can be connected in a diode mode; or the voltage clamping device 40 can be a voltage clamping device comprising at least one MOS tube, wherein the MOS tube can be a gate-drain shorted P-type MOSFET or a gate-drain shorted N-type MOSFET; or the voltage clamping device 40 can be a voltage clamping device comprising at least one Zener diode. Figure 7 In some embodiments, the voltage clamping device 40 can be any combination of any number of diodes, triodes, MOS tubes and Zener diodes. For example, the voltage clamping device 40 can comprise one diode, one NMOS tube, one Zener diode and one PMOS tube connected in series.

[0058] In some embodiments, the second controller 110 can comprise a first load resistor R11 and a second load resistor R12, one end of the first load resistor R11 and one end of the second load resistor R12 are both connected to the floating power supply end FVCC, the other end of the first load resistor R11 is connected to the flip-flop 111 and the first input end R2, and the other end of the second load resistor R12 is connected to the flip-flop 111 and the second input end S2.

[0059] In other embodiments, the second controller 110 can comprise a fourth NMOS tube P1 and a second PMOS tube P2, the drain of the fourth NMOS tube P1 and the source of the second PMOS tube P2 are both connected to the floating power supply end FVCC, the source of the fourth NMOS tube P1 is connected to the first input end R2, the gate of the second PMOS tube P2 and the logic circuit 112, the drain of the second PMOS tube P2 is connected to the second input end S2, the gate of the fourth NMOS tube P1 and the logic circuit 112.

[0060] In some embodiments, the first controller 100 and the second controller 110 can be independent dies respectively and packaged in the same chip as the battery driving chip 10.

[0061] In some embodiments, the first controller 100 and the second controller 110 can be independent dies respectively and packaged in the same chip as the battery driving chip 10.

[0062] In some embodiments, the first controller 100 and the second controller 110 can be independently packaged chips respectively, and are mounted on a circuit board and coupled through wires on the circuit board.

[0063] In some embodiments, the logic control circuit can include a Schmitt trigger. The pulse generator 101 can include a first inverter, a first rising edge delay circuit, a second rising edge delay circuit, a second inverter, a third inverter, a first OR gate, and a second OR gate. The pulse generator 101 can generate two pulse output signals respectively using a signal triggered by the Schmitt trigger.

[0064] The present application also relates to a battery driving chip 10 for the battery driving circuit 1 as described above. The battery driving chip 10 can include the first controller 100 and the second controller 110.

[0065] In some embodiments, the first controller 100 can include a control signal input end PWM, a first output end R1, and a second output end S1, and the first controller 100 can be configured to generate two pulse signals or two complementary PWM signals according to a PWM signal from the control signal input end PWM and then output the two pulse signals or the two complementary PWM signals through the first output end R1 and the second output end S1 respectively.

[0066] In some embodiments, the second controller 110 can include a first input end R2, a second input end S2, and a third output end S3, the first input end R2 is coupled with the first output end R1, the second input end S2 can be coupled with the second output end S1, and the second controller 110 can be configured to generate a floating PWM signal FPWM according to the two pulse signals or the two complementary PWM signals and output the floating PWM signal FPWM through the third output end S3.

[0067] The present application also relates to a battery switch driving module (not shown in the figure), which can include a driving array and a switch array. The driving array can include a plurality of battery driving circuits 1 as described above, and the switch array can include a plurality of switch units. One battery driving circuit 1 can be connected with a bidirectional converter through one switch unit, and another battery driving circuit 1 can be connected with one battery of a battery pack through another switch unit.

[0068] In some embodiments, the battery driving circuit 1 can generate a floating driving signal according to a received PWM signal, and the switch unit can be turned on or turned off according to a received floating driving signal to turn on or turn off a current path between one or more batteries of the battery pack and the bidirectional converter, so as to adjust the charging and discharging of each battery in the battery pack.

[0069] In the application, the first controller 100 processes the PWM signal to generate a pulse signal or a complementary PWM signal, the second controller 110 processes the pulse signal or the complementary PWM signal to obtain a floating PWM signal, and finally the driving module 20 processes the floating PWM signal to obtain a floating driving signal for driving the switching unit. Thus, the application is simple in the process of generating the floating driving signal based on the PWM signal, easy to control, and small in the power consumption of each circuit element and the overall volume.

[0070] The above only describes the preferred embodiments of the present application, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the present application. In addition, the features and embodiments can be modified to adapt to specific conditions and materials under the guidance of the present application without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the protection scope of the present application.

Claims

1. A battery driving circuit, characterized by comprising: The battery driving circuit comprises: a battery driving chip comprising a first controller and a second controller; the first controller comprises a control signal input end, a first output end and a second output end, and is configured to generate two pulse signals or two complementary PWM signals according to a PWM signal from the control signal input end, and then output the two pulse signals or the two complementary PWM signals through the first output end and the second output end respectively; the second controller comprises a first input end, a second input end and a third output end, the first input end is coupled with the first output end, the second input end is coupled with the second output end, and the second controller is configured to generate a floating PWM signal according to the two pulse signals or the two complementary PWM signals and output the floating PWM signal through the third output end; and a driving module, one end of the driving module is coupled with the third output end, and the other end of the driving module is coupled with a floating driving output end of the battery driving circuit, and the driving module is configured to generate a floating driving signal according to the floating PWM signal and output the floating driving signal through the floating driving output end to drive a switching unit to be turned on or turned off.

2. The battery drive circuit according to claim 1, characterized by The first controller comprises a pulse generator, the pulse generator is coupled with the control signal input end, the first output end and the second output end, and the pulse generator is configured to generate the two pulse signals according to rising and falling edges of the PWM signal from the control signal input end and output the two pulse signals through the first output end and the second output end respectively.

3. The battery drive circuit according to claim 2, characterized by The second controller comprises a flip-flop, one end of the flip-flop is coupled with the first input end and the second input end, and the other end of the flip-flop is coupled with the third output end, and the flip-flop is configured to generate the floating PWM signal according to the two pulse signals and output the floating PWM signal through the third output end.

4. The battery drive circuit according to claim 1, characterized by The first controller comprises a comparator, the comparator is coupled with the control signal input end, the first output end and the second output end, and the comparator is configured to generate the two complementary PWM signals according to the PWM signal from the control signal input end and output the two complementary PWM signals through the first output end and the second output end respectively.

5. The battery drive circuit according to claim 4, wherein The second controller comprises a logic circuit, one end of the logic circuit is coupled with the first input end and the second input end, and the other end of the logic circuit is coupled with the third output end, and the logic circuit is configured to generate the floating PWM signal according to the two complementary PWM signals and output the floating PWM signal through the third output end.

6. The battery drive circuit according to claim 3 or 5, wherein The battery driving circuit comprises a floating power supply end and a floating ground end for providing a floating voltage; the second controller and the driving module are both coupled with the floating power supply end and the floating ground end.

7. The battery drive circuit according to claim 2, wherein The first controller comprises a first NMOS tube and a second NMOS tube; the gates of the first NMOS tube and the second NMOS tube are both coupled with the pulse generator, the sources of the first NMOS tube and the second NMOS tube are both coupled with a ground end, the drain of the first NMOS tube is coupled with the first output end, and the drain of the second NMOS tube is coupled with the second output end; The first controller generates the two pulse signals at the drain of the first NMOS tube and the drain of the second NMOS tube and outputs the two pulse signals through the first output end and the second output end respectively.

8. The battery drive circuit according to claim 6, wherein The battery driving circuit comprises a power supply converter; one end of the power supply converter is connected with a power supply end of the battery driving circuit, and the other end of the power supply converter is connected with the second controller and the floating voltage end; the power supply converter is an LDO voltage stabilizer, or a combination of the LDO voltage stabilizer and a JFET device, or a plurality of series resistors.

9. The battery drive circuit according to claim 6, wherein The driving module comprises a pre-driver and a driver; one end of the pre-driver is coupled with the second controller, the other end of the pre-driver is coupled with one end of the driver, and one end of the driver is coupled with the floating driving output end; The pre-driver generates a pre-driving signal according to a floating PWM signal from the second controller and transmits the pre-driving signal to the driver; the driver generates the floating driving signal according to the pre-driving signal from the pre-driver and outputs the floating driving signal through the floating driving output end.

10. The battery drive circuit according to claim 9, wherein The driver comprises a third NMOS tube and a first PMOS tube; the third NMOS tube and the first PMOS tube share a common gate and are connected with the pre-driver; the source of the third NMOS tube is coupled with the floating ground end; the source of the first PMOS tube is coupled with the floating power supply end, and the drain of the first PMOS tube is connected with the drain of the third NMOS tube and the floating driving output end.

11. The battery drive circuit according to claim 6, wherein The battery driving circuit further comprises a clamping device, one end of the clamping device is coupled with the floating power supply end, and the other end of the clamping device is coupled with the floating ground end.

12. The battery drive circuit according to claim 11, wherein The clamping device comprises at least one diode and / or at least one triode and / or at least one MOS tube and / or at least one voltage stabilizing tube.

13. The battery drive circuit according to claim 6, characterized by The second controller comprises a first load resistor and a second load resistor; one end of the first load resistor is connected with one end of the second load resistor and the floating power supply end; the other end of the first load resistor is connected with a flip-flop and the first input end; the other end of the second load resistor is connected with the flip-flop and the second input end.

14. The battery drive circuit according to claim 6, wherein The second controller comprises a fourth NMOS tube and a second PMOS tube; the drain of the fourth NMOS tube and the source of the second PMOS tube are connected with the floating power supply end; the source of the fourth NMOS tube is connected with the first input end, the gate of the second PMOS tube and a logic circuit; the drain of the second PMOS tube is connected with the second input end, the gate of the fourth NMOS tube and the logic circuit.

15. A battery driving chip for the battery driving circuit according to any one of claims 1 to 14, characterized by The battery driving chip comprises a first controller and a second controller; The first controller comprises a control signal input end, a first output end and a second output end; the first controller is configured to generate two pulse signals or two complementary PWM signals according to a PWM signal from the control signal input end and then output the two pulse signals or the two complementary PWM signals through the first output end and the second output end respectively; The second controller includes a first input, a second input and a third output, the first input is coupled with the first output, the second input is coupled with the second output, the second controller is configured to generate a floating PWM signal according to the two pulse signals or the two complementary PWM signals and output through the third output.

16. A battery switch drive module characterized by, The battery driving circuit includes a driving array and a switching array, the driving array includes a plurality of battery driving circuits as claimed in any one of claims 1-14, the switching array includes a plurality of switching units, one of the battery driving circuits is connected with the bidirectional converter through one of the switching units, and another of the battery driving circuits is connected with one of the batteries of the battery pack through another of the switching units. The battery driving circuit generates a floating driving signal according to the received PWM signal, and the switching unit is turned on or turned off according to the received floating driving signal to turn on or turn off the current path between one or more of the batteries of the battery pack and the bidirectional converter, so as to adjust the charging and discharging of each battery in the battery pack.

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