Switching converter circuit, chip, battery system, and electronic device

Abstract

This application relates to the field of electronic circuit technology, and more particularly to a switching converter circuit, a chip, a battery system, and an electronic device. The switching converter circuit includes: a first charge / discharge terminal, a second charge / discharge terminal, a first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit; the first terminals of the first and second voltage conversion circuits are both connected to the first charge / discharge terminal; the second terminals of both the first and second voltage conversion circuits are grounded; the third terminal of the first voltage conversion circuit is connected to the first terminal of the third voltage conversion circuit; the third terminal of the second voltage conversion circuit is connected to both the second charge / discharge terminal and the second terminal of the third voltage conversion circuit; and the third terminal of the third voltage conversion circuit is connected to the second charge / discharge terminal. The first, second, and third voltage conversion circuits work together to achieve continuous voltage regulation with multiple turns ratios and can support both forward and reverse output.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a switching converter circuit, chip, battery system and electronic device. Background Technology

[0002] With the rapid development of electronic products, electronic devices are becoming increasingly powerful, have higher data processing efficiency, and offer higher display resolutions, leading to ever-increasing demands on charging efficiency. In related technologies, switched-capacitor voltage converters (SVCs) are commonly used to meet the fast charging needs of electronic devices. As a basic power conversion structure, SVCs are widely used in various power management applications. They utilize energy storage capacitors as energy storage elements and control the on-time of switching transistors to change the capacitor connection method, thereby achieving voltage and current conversion between input and output at various ratios. For complex voltage conversion requirements, multi-stage architectures can be used to construct corresponding SVCs. The main application scenario for SVCs is mobile devices. Their advantages lie in high efficiency and the ability to achieve rapid charging in short periods. However, they limit the relative voltage range of input and output and cannot support continuous forward or reverse voltage regulation and regulated output, making them unsuitable for certain application scenarios. Summary of the Invention

[0003] This application provides a switching converter circuit, chip, battery system, and electronic device to solve the technical problem in the related art that the input-output relative voltage range is narrow and cannot support continuous forward or reverse voltage regulation.

[0004] In a first aspect, this application provides a switching converter circuit, the switching converter circuit including: a first charge-discharge terminal, a second charge-discharge terminal, a first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit; The first terminal of the first voltage conversion circuit and the first terminal of the second voltage conversion circuit are both connected to the first charge / discharge terminal. The second terminal of the first voltage conversion circuit and the second terminal of the second voltage conversion circuit are both grounded. The third terminal of the first voltage conversion circuit is connected to the first terminal of the third voltage conversion circuit. The third terminal of the second voltage conversion circuit is connected to the second charge / discharge terminal and the second terminal of the third voltage conversion circuit, respectively. The third terminal of the third voltage conversion circuit is connected to the second charge / discharge terminal. The first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are all used to receive corresponding on / off control signals. The on / off control signals are used to control the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit to operate in either a forward charging mode or a reverse discharging mode. When the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are all operating in the forward charging mode, the on / off control signal is used to control the first voltage conversion circuit and the second voltage conversion circuit to step down the first charging voltage input to the first charging terminal to obtain the second charging voltage, and to control the third voltage conversion circuit to step down the second charging voltage to obtain the third charging voltage; the third charging voltage is less than the second charging voltage, and the second charging terminal is used to output the third charging voltage; When the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are all operating in reverse discharge mode, the on / off control signal is used to control the third voltage conversion circuit to boost the first discharge voltage output from the second charge / discharge terminal to obtain the second discharge voltage, and to control the first voltage conversion circuit and the second voltage conversion circuit to boost the second discharge voltage to obtain the third discharge voltage; the third discharge voltage is greater than the second discharge voltage, and the first charge / discharge terminal is used to output the third discharge voltage.

[0005] In one possible design of this application, the first voltage conversion circuit includes a first capacitor and a plurality of transistors, and the first voltage conversion circuit is a switched capacitor voltage conversion circuit composed of the first capacitor and the plurality of transistors; The second voltage conversion circuit includes a second capacitor and a plurality of transistors, and the second voltage conversion circuit is a switched capacitor voltage conversion circuit composed of the second capacitor and the plurality of transistors; The third voltage conversion circuit includes a third capacitor, a first inductor, and multiple transistors. The third voltage conversion circuit is one of a two-level voltage conversion circuit, a three-level voltage conversion circuit, or a charge pump circuit composed of the third capacitor, the first inductor, and multiple transistors.

[0006] In one possible design of this application, the switching converter circuit further includes a first transistor and a third transistor, wherein the first terminal of the first transistor is connected to the first charge / discharge terminal, the second terminal of the first transistor is connected to the first terminal of the first voltage conversion circuit and the first terminal of the third transistor, and the second terminal of the third transistor is connected to the first terminal of the second voltage conversion circuit. The control electrodes of both the first transistor and the third transistor are used to receive the on / off control signal, which is used to control the on and off of the corresponding transistor.

[0007] In one possible design of this application, the first voltage conversion circuit further includes a second transistor and a fourth transistor. The first terminal of the first capacitor is the first terminal of the first voltage conversion circuit. The second terminal of the first capacitor is connected to the first terminal of the second transistor and the second terminal of the fourth transistor, respectively. The second terminal of the second transistor is grounded. The first terminal of the fourth transistor is the third terminal of the first voltage conversion circuit. The first terminal of the fourth transistor is connected to the first terminal of the third capacitor. The control electrode of the second transistor and the control electrode of the fourth transistor are both used to receive the on / off control signal, which is used to control the second transistor and the fourth transistor to be turned on or off.

[0008] In one possible design of this application, the second voltage conversion circuit includes a fifth transistor, a sixth transistor, and a seventh transistor. The first terminal of the fifth transistor is the first terminal of the second voltage conversion circuit. The first terminal of the fifth transistor is connected to the second terminal of the third transistor and the first terminal of the second capacitor. The second terminal of the fifth transistor is connected to the second charge / discharge terminal and the first terminal of the sixth transistor. The second terminal of the fifth transistor and the first terminal of the sixth transistor form the third terminal of the second voltage conversion circuit. The second terminal of the sixth transistor is connected to the first terminal of the seventh transistor and the second terminal of the second capacitor. The second terminal of the seventh transistor is grounded. The control electrodes of the fifth transistor, the sixth transistor, and the seventh transistor are all used for the on / off control signal, which is used to control the conduction or shutdown of the fifth transistor, the sixth transistor, and the seventh transistor.

[0009] In one possible design of this application, the third voltage conversion circuit further includes an eighth transistor, a ninth transistor, a tenth transistor, an eleventh transistor, and a twelfth transistor; The first terminal of the eighth transistor is connected to the first terminal of the third capacitor and the first terminal of the eleventh transistor, respectively. The first terminal of the eighth transistor, the first terminal of the third capacitor, and the first terminal of the eleventh transistor together form the first terminal of the third voltage conversion circuit. The second terminal of the eighth transistor and the first terminal of the ninth transistor together form the third terminal of the third voltage conversion circuit. The second terminal of the eighth transistor is connected to the first terminal of the ninth transistor and the second charge / discharge terminal, respectively. The second terminal of the ninth transistor is connected to the first terminal of the tenth transistor and the second terminal of the third capacitor, respectively. The second terminal of the eleventh transistor is connected to the first terminal of the twelfth transistor and the first terminal of the first inductor, respectively. The second terminal of the first inductor is the second terminal of the third voltage conversion circuit, and the second terminal of the first inductor is connected to the second charge / discharge terminal, the second terminal of the fifth transistor, and the first terminal of the sixth transistor, respectively. The control terminals of the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, and the twelfth transistor are all used to receive the on / off control signal, which is used to control the on or off state of the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, and the twelfth transistor. The second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor; or the second terminal of the twelfth transistor is grounded. Specifically, when the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, the twelfth transistor, the first inductor, and the third capacitor form a three-level voltage conversion circuit; when the second terminal of the twelfth transistor is grounded, the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, the twelfth transistor, the first inductor, and the third capacitor form a two-level voltage conversion circuit.

[0010] In one possible design of this application, when the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, respectively: The switching converter circuit further includes a first switching circuit, which is connected to the body terminal of the eighth transistor. The first switching circuit is used to receive a first switching control signal, which is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor to the source terminal or common ground of the eighth transistor. Alternatively, the switching converter circuit may further include a second switching circuit; the second switching circuit is connected to the body terminal of the ninth transistor, and the second switching circuit is used to receive a second switching control signal, which is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor to the source of the eighth transistor or to a common ground. Alternatively, the switching converter circuit may further include a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor. The first switching circuit is used to receive a first switching control signal, which is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor to the source terminal or a common ground terminal. The second switching circuit is connected to the body terminal of the ninth transistor. The second switching circuit is used to receive a second switching control signal, which is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor to the source terminal or a common ground terminal.

[0011] In one possible design of this application, when the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, respectively: The switching converter circuit further includes a thirteenth transistor and a third switching circuit. The first terminal of the thirteenth transistor is connected to the second terminal of the eighth transistor and the first terminal of the ninth transistor, respectively. The second terminal of the thirteenth transistor is connected to the second charge / discharge terminal. The control terminal of the thirteenth transistor is used to receive an on / off control signal, which is used to control the conduction and turn-off of the thirteenth transistor. The third switching circuit is connected to the body terminal of the thirteenth transistor. The third switching circuit is used to receive a third switching control signal. The third switching control signal is used to control the operation of the third switching circuit, thereby connecting the body terminal of the thirteenth transistor to the source terminal or common ground of the thirteenth transistor.

[0012] In one possible design of this application, when the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor and is used to receive a first switching control signal. The first switching control signal is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor to the source terminal or a common ground. The second switching circuit is connected to the body terminal of the ninth transistor and is used to receive a second switching control signal. The second switching control signal is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor to the source terminal or a common ground. The switching converter circuit further includes a fourteenth transistor. The first terminal of the fourteenth transistor is connected to the second terminal of the first transistor, the first terminal of the first capacitor, and the first terminal of the third transistor. The second terminal of the fourteenth transistor is connected to the first terminal of the fourth transistor, the first terminal of the third capacitor, the first terminal of the eighth transistor, and the first terminal of the eleventh transistor. The control terminal of the fourteenth transistor is used to receive an on / off control signal, which is used to control the on and off of the fourteenth transistor.

[0013] In one possible design of this application, when the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor and is used to receive a first switching control signal. The first switching control signal is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor to the source terminal or a common ground. The second switching circuit is connected to the body terminal of the ninth transistor and is used to receive a second switching control signal. The second switching control signal is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor to the source terminal or a common ground. The switching converter circuit further includes a fifteenth transistor. The first terminal of the fifteenth transistor is connected to the first terminal of the first transistor and the first charge / discharge terminal, respectively. The second terminal of the fifteenth transistor is connected to the first terminal of the fourth transistor, the first terminal of the third capacitor, the first terminal of the eighth transistor, and the first terminal of the eleventh transistor, respectively. The control terminal of the fifteenth transistor is used to receive an on / off control signal, which is used to control the conduction and turn-off of the fifteenth transistor.

[0014] In one possible design of this application, the switching converter circuit further includes a sixteenth transistor, the second terminal of which is connected to the first charge / discharge terminal, the first terminal of which is connected to the first terminal of the first transistor, and the control terminal of the sixteenth transistor is used to receive an on / off control signal, which is used to control the conduction and turn-off of the sixteenth transistor.

[0015] In one possible design of this application, when the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor and is used to receive a first switching control signal. The first switching control signal is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor to the source terminal or a common ground. The second switching circuit is connected to the body terminal of the ninth transistor and is used to receive a second switching control signal. The second switching control signal is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor to the source terminal or a common ground. The switching converter circuit further includes a fourth switching circuit, which is connected to the body terminal of the fifth transistor. The fourth switching circuit is used to receive a fourth switching control signal, which is used to control the operation of the fourth switching circuit, thereby connecting the body terminal of the fifth transistor to the source terminal or common ground of the fifth transistor.

[0016] In one possible design of this application, the switching converter circuit further includes a fifth switching switch and a sixth switching switch; The fifth switching circuit is connected to the body terminal of the fifth transistor. The fifth switching circuit is used to receive a fifth switching control signal. The fifth switching control signal is used to control the operation of the fifth switching circuit, thereby connecting the body terminal of the fifth transistor to the source terminal or common ground of the fifth transistor. The sixth switching circuit is connected to the body terminal of the eleventh transistor. The sixth switching circuit is used to receive a sixth switching control signal. The sixth switching control signal is used to control the operation of the sixth switching circuit, thereby connecting the body terminal of the eleventh transistor to the source terminal or common ground of the eleventh transistor.

[0017] In one possible design of this application, when the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, respectively, when the switching converter circuit operates in the first charging mode, the third voltage conversion circuit operates in the three-electric-voltage stabilization mode, within any charging cycle: The control electrode of the eighth transistor and the control electrode of the ninth transistor are both used to receive a first shutdown control signal. The first shutdown control signal is used to control the eighth transistor and the ninth transistor to be in a shutdown state during the charging cycle. In the first stage of the charging cycle, the control electrodes of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the twelfth transistor are all used to receive a second turn-on control signal. The second turn-on control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the twelfth transistor to be in the turn-on state in the first stage. The control electrodes of the third transistor, the sixth transistor, the eleventh transistor, the second transistor, and the tenth transistor are all used to receive a second turn-off control signal. The second turn-off control signal is used to control the third transistor, the sixth transistor, the eleventh transistor, the second transistor, and the tenth transistor to be in the turn-off state in the first stage. In the second stage of the charging cycle, the control terminals of the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor are all used to receive a third turn-on control signal. The third turn-on control signal is used to control the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor to be in the turn-on state in the second stage. The control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a third turn-off control signal. The third turn-off control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in the turn-off state in the second stage. In the third stage of the charging cycle, the control terminals of the fifth transistor, the seventh transistor, the eleventh transistor, the second transistor, and the tenth transistor are all used to receive a fourth turn-on control signal. This fourth turn-on control signal controls the fifth transistor, the seventh transistor, the eleventh transistor, the second transistor, and the tenth transistor to be in a turn-on state during the third stage. The control terminals of the first transistor, the fourth transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive a fourth turn-off control signal. This fourth turn-off control signal controls the first transistor, the fourth transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in a turn-off state during the third stage. In the fourth stage of the charging cycle, the control electrodes of the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor are all used to receive a fifth turn-on control signal. This fifth turn-on control signal controls the third transistor, the sixth transistor, the twelfth transistor, and the second transistor to be in a turn-on state during the fourth stage. The control electrodes of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a fifth turn-off control signal. This fifth turn-off control signal controls the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in a turn-off state during the fourth stage. The on / off control signals include the first off control signal, the second off control signal, the third off control signal, the fourth off control signal, the fifth off control signal, the second on control signal, the third on control signal, the fourth on control signal, and the fifth on control signal.

[0018] In one possible design of this application, when the second terminal of the twelfth transistor is grounded and the switching converter circuit operates in the second charging mode, the third voltage conversion circuit operates in a two-voltage stabilization mode, within any charging cycle: The control electrode of the eighth transistor, the control electrode of the ninth transistor, and the control electrode of the tenth transistor are all used to receive the sixth turn-off control signal. The sixth turn-off control signal is used to control the eighth transistor, the ninth transistor, and the tenth transistor to be in the off state during the charging cycle. In the first stage of the charging cycle, the control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a seventh turn-on control signal. The seventh turn-on control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in the turn-on state during the first stage. The control terminals of the second transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive a seventh turn-off control signal. The seventh turn-off control signal is used to control the second transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in the turn-off state during the first stage. In the second stage of the charging cycle, the control terminals of the second transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive an eighth turn-on control signal. The eighth turn-on control signal is used to control the second transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in the turn-on state during the second stage. The control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive an eighth turn-off control signal. The eighth turn-off control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in the turn-off state during the second stage. The on / off control signals include the sixth off control signal, the seventh off control signal, the eighth off control signal, the seventh on control signal, and the eighth on control signal.

[0019] In one possible design of this application, when the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, respectively, when the switching converter circuit operates in the first discharge mode, the third voltage conversion circuit operates in the three-voltage stabilization mode, within any discharge cycle: The control electrode of the eighth transistor and the control electrode of the ninth transistor are both used to receive the ninth turn-off control signal. The ninth turn-off control signal is used to control the eighth transistor and the ninth transistor to be in the off state during the charging cycle. In the first stage of the discharge cycle, the control electrodes of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the twelfth transistor are all used to receive a tenth turn-on control signal. The tenth turn-on control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the twelfth transistor to be in the turn-on state in the first stage. The control electrodes of the third transistor, the sixth transistor, the eleventh transistor, the second transistor, and the tenth transistor are all used to receive a tenth turn-off control signal. The tenth turn-off control signal is used to control the third transistor, the sixth transistor, the eleventh transistor, the second transistor, and the tenth transistor to be in the turn-off state in the first stage. In the second stage of the discharge cycle, the control terminals of the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor are all used to receive an eleventh turn-on control signal. This eleventh turn-on control signal controls the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor to be in a turn-on state during the second stage. The control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive an eleventh turn-off control signal. This eleventh turn-off control signal controls the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in a turn-off state during the second stage. In the third stage of the discharge cycle, the control terminals of the fifth transistor, the seventh transistor, the eleventh transistor, the second transistor, and the tenth transistor are all used to receive a twelfth turn-on control signal. This twelfth turn-on control signal controls the fifth transistor, the seventh transistor, the eleventh transistor, the second transistor, and the tenth transistor to be in a turn-on state during the third stage. The control terminals of the first transistor, the fourth transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive a twelfth turn-off control signal. This twelfth turn-off control signal controls the first transistor, the fourth transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in a turn-off state during the third stage. In the fourth stage of the discharge cycle, the control terminals of the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor are all used to receive a thirteenth turn-on control signal. This thirteenth turn-on control signal controls the third transistor, the sixth transistor, the twelfth transistor, and the second transistor to be in a turn-on state during the fourth stage. The control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a thirteenth turn-off control signal. This thirteenth turn-off control signal controls the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in a turn-off state during the fourth stage. The on / off control signals include the ninth off control signal, the tenth off control signal, the eleventh off control signal, the twelfth off control signal, the tenth on control signal, the eleventh on control signal, the twelfth on control signal, and the thirteenth on control signal.

[0020] In one possible design of this application, when the second terminal of the twelfth transistor is grounded and the switching converter circuit operates in the second discharge mode, the third voltage conversion circuit operates in a two-voltage stabilization mode, within any discharge cycle: The control electrode of the eighth transistor, the control electrode of the ninth transistor, and the control electrode of the tenth transistor are all used to receive the fourteenth shutdown control signal. The fourteenth shutdown control signal is used to control the eighth transistor, the ninth transistor, and the tenth transistor to be in the shutdown state during the charging cycle. In the first stage of the discharge cycle, the control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a fifteenth turn-on control signal. The fifteenth turn-on control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in the turn-on state during the first stage. The control terminals of the second transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive a fifteenth turn-off control signal. The fifteenth turn-off control signal is used to control the second transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in the turn-off state during the first stage. In the second stage of the charging cycle, the control terminals of the second transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive a sixteenth turn-on control signal. The sixteenth turn-on control signal is used to control the second transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in the turn-on state during the second stage. The control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a sixteenth turn-off control signal. The sixteenth turn-off control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in the turn-off state during the second stage. The on / off control signals include the fourteenth off control signal, the fifteenth off control signal, the sixteenth off control signal, the fifteenth on control signal, and the sixteenth on control signal.

[0021] In one possible design of this application, when the second terminal of the twelfth transistor is grounded, and the switching converter circuit operates in the third charging mode, the third voltage conversion circuit operates in a two-voltage stabilization mode, within any charging cycle: The control electrode of the first transistor is used to receive the seventeenth conduction control signal, which controls the first transistor to be in the conduction state throughout the charging cycle; the control electrodes of the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, and the ninth transistor are all used to receive the seventeenth turn-off control signal, which controls the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, and the ninth transistor to be in the turn-off state throughout the charging cycle; In the first stage of the charging cycle, the control terminals of the eleventh transistor and the fourteenth transistor are both used to receive the eighteenth turn-on control signal, which controls the eleventh transistor and the fourteenth transistor to switch to the turn-on state in the first stage; the control terminals of the tenth transistor and the twelfth transistor are both used to receive the eighteenth turn-off control signal, which controls the tenth transistor and the twelfth transistor to switch to the turn-off state in the first stage. In the second stage of the charging cycle, the control terminals of the twelfth transistor and the fourteenth transistor are both used to receive the nineteenth turn-on control signal, which controls the twelfth transistor and the fourteenth transistor to switch to the turn-on state in the second stage; the control terminals of the tenth transistor and the eleventh transistor are both used to receive the nineteenth turn-off control signal, which controls the tenth transistor and the eleventh transistor to switch to the turn-off state in the second stage. In the third stage of the charging cycle, the control terminals of the eleventh transistor and the fourteenth transistor are both used to receive the twentieth turn-on control signal, which controls the eleventh transistor and the fourteenth transistor to switch to the turn-on state in the third stage; the control terminals of the tenth transistor and the twelfth transistor are both used to receive the twentieth turn-off control signal, which controls the tenth transistor and the twelfth transistor to switch to the turn-off state in the third stage. In the fourth stage of the charging cycle, the control terminals of the tenth transistor and the eleventh transistor are both used to receive the twenty-first turn-on control signal, which controls the tenth transistor and the eleventh transistor to switch to the turn-on state in the fourth stage; the control terminals of the twelfth transistor and the fourteenth transistor are both used to receive the twenty-first turn-off control signal, which controls the twelfth transistor and the fourteenth transistor to switch to the turn-off state in the fourth stage. The on / off control signals include the seventeenth on control signal, the eighteenth on control signal, the nineteenth on control signal, the twentieth on control signal, the twenty-first on control signal, the seventeenth off control signal, the eighteenth off control signal, the nineteenth off control signal, the twentieth off control signal, and the twenty-first off control signal.

[0022] In one possible design of this application, when the second terminal of the twelfth transistor is grounded, and the switching converter circuit operates in the third discharge mode, the third voltage conversion circuit operates in a two-voltage stabilization mode, within any discharge cycle: The control electrode of the first transistor is used to receive a twenty-second conduction control signal, which controls the first transistor to be in the conduction state throughout the charging cycle. The control electrodes of the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, and the ninth transistor are all used to receive a twenty-second turn-off control signal, which controls the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, and the ninth transistor to be in the turn-off state throughout the charging cycle. In the first stage of the charging cycle, the control terminals of the eleventh transistor and the fourteenth transistor are both used to receive the twenty-third turn-on control signal. The twenty-third turn-on control signal is used to control the eleventh transistor and the fourteenth transistor to switch to the turn-on state in the first stage. The control terminals of the tenth transistor and the twelfth transistor are both used to receive the twenty-third turn-off control signal. The twenty-third turn-off control signal is used to control the tenth transistor and the twelfth transistor to switch to the turn-off state in the first stage. In the second stage of the charging cycle, the control terminals of the twelfth transistor and the fourteenth transistor are both used to receive the twenty-fourth turn-on control signal, which controls the twelfth transistor and the fourteenth transistor to switch to the turn-on state in the second stage; the control terminals of the tenth transistor and the eleventh transistor are both used to receive the twenty-fourth turn-off control signal, which controls the tenth transistor and the eleventh transistor to switch to the turn-off state in the second stage. In the third stage of the charging cycle, the control terminals of the eleventh transistor and the fourteenth transistor are both used to receive the twenty-fifth turn-on control signal. The twenty-fifth turn-on control signal is used to control the eleventh transistor and the fourteenth transistor to switch to the turn-on state in the third stage. The control terminals of the tenth transistor and the twelfth transistor are both used to receive the twenty-fifth turn-off control signal. The twenty-fifth turn-off control signal is used to control the tenth transistor and the twelfth transistor to switch to the turn-off state in the third stage. In the fourth stage of the charging cycle, the control terminals of the tenth and eleventh transistors are both used to receive the twenty-sixth turn-on control signal, which controls the tenth and eleventh transistors to switch to the turn-on state in the fourth stage; the control terminals of the twelfth and fourteenth transistors are both used to receive the twenty-sixth turn-off control signal, which controls the twelfth and fourteenth transistors to switch to the turn-off state in the fourth stage. The on / off control signals include the 22nd on control signal, the 23rd on control signal, the 24th on control signal, the 25th on control signal, the 26th on control signal, the 22nd off control signal, the 23rd off control signal, the 24th off control signal, the 25th off control signal, and the 26th off control signal.

[0023] In one possible design of this application, the switching converter circuit further includes a control circuit, the output terminal of which is connected to the control terminals of the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, and the twelfth transistor, respectively. The control circuit is used to output corresponding on / off control signals to the control electrodes of the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, and the twelfth transistor, respectively, so as to control the switching converter circuit to operate in different charging or discharging modes.

[0024] Secondly, this application also provides a chip, the chip including the switching converter circuit described in any of the above claims.

[0025] Thirdly, this application also provides a battery system, the battery system including the switching converter circuit described in any of the above claims.

[0026] Fourthly, this application also provides an electronic device, which includes the switching converter circuit described in any of the preceding claims; or the electronic device includes the chip described above.

[0027] The switching converter circuit provided in the first aspect above includes: a first charge / discharge terminal, a second charge / discharge terminal, a first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit; the first terminal of the first voltage conversion circuit and the first terminal of the second voltage conversion circuit are both connected to the first charge / discharge terminal, the second terminals of the first voltage conversion circuit and the second voltage conversion circuit are both grounded, the third terminal of the first voltage conversion circuit is connected to the first terminal of the third voltage conversion circuit, the third terminal of the second voltage conversion circuit is connected to the second charge / discharge terminal and the second terminal of the third voltage conversion circuit respectively, and the third terminal of the third voltage conversion circuit is connected to the second charge / discharge terminal; the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are all used to receive corresponding on / off control signals, and the on / off control signals are used to control the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit to operate in either a forward charging mode or a reverse discharging mode; wherein, when the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit operate in either a forward charging mode or a reverse discharging mode, the switching converter circuit... When both the voltage conversion circuit and the third voltage conversion circuit operate in forward charging mode, the on / off control signal is used to control the first voltage conversion circuit and the second voltage conversion circuit to step down the first charging voltage input to the first charging / discharging terminal to obtain a second charging voltage, and to control the third voltage conversion circuit to step down the second charging voltage to obtain a third charging voltage; the third charging voltage is less than the second charging voltage, and the second charging / discharging terminal is used to output the third charging voltage. When all three voltage conversion circuits operate in reverse discharging mode, the on / off control signal is used to control the third voltage conversion circuit to boost the first discharging voltage output to the second charging / discharging terminal to obtain a second discharging voltage, and to control the first voltage conversion circuit and the second voltage conversion circuit to boost the second discharging voltage to obtain a third discharging voltage; the third discharging voltage is greater than the second discharging voltage, and the first charging / discharging terminal is used to output the third discharging voltage. As can be seen, according to the switching converter circuit provided in this application, the first voltage conversion circuit, the second voltage conversion circuit and the third voltage conversion circuit can work together in each working cycle to achieve continuous voltage regulation with multiple turns ratios, expand the input and output voltage range, and support forward and reverse outputs to be suitable for various charging and discharging scenarios.

[0028] The beneficial effects provided by the other aspects and the various possible designs of the other aspects can be found in the beneficial effects of the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0029] Figure 1 A schematic diagram of a switched capacitor voltage conversion circuit provided for related technologies; Figure 2 This is one of the schematic diagrams of the switching converter circuit provided in the embodiments of this application; Figure 3 This is a second schematic diagram of the switching converter circuit provided in the embodiments of this application; Figure 4 This is the third schematic diagram of the switching converter circuit provided in the embodiments of this application; Figure 5 The fourth schematic diagram of the switching converter circuit provided in the embodiments of this application; Figure 6 Fifth schematic diagram of the switching converter circuit provided in the embodiments of this application; Figure 7 This is the sixth schematic diagram of the switching converter circuit provided in the embodiments of this application; Figure 8 Seventh schematic diagram of the switching converter circuit provided in the embodiments of this application Figure 9 This is the eighth schematic diagram of the switching converter circuit provided in the embodiments of this application; Figure 10 This is the ninth schematic diagram of the switching converter circuit provided in the embodiments of this application; Figure 11 This is the tenth schematic diagram of the switching converter circuit provided in the embodiments of this application; Figure 12 This is eleventh of the structural schematic diagrams of the switching converter circuit provided in the embodiments of this application; Figure 13 A schematic diagram of the control signal waveform of the switching converter circuit provided in the embodiment of this application operating in the first charging mode; Figure 14 A schematic diagram of the control signal waveform of the switching converter circuit operating in the second charging mode, provided in an embodiment of this application; Figure 15 A schematic diagram of the control signal waveform of the switching converter circuit provided in the embodiment of this application operating in the third charging mode. Detailed Implementation

[0030] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can mean: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] The terms “center,” “longitudinal,” “lateral,” “up,” “down,” “left,” “right,” “front,” and “rear,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] The terms "connected" and "connected" should be interpreted broadly. For example, in circuit structures, "connected" or "connected" can refer not only to physical connections but also to electrical or signal connections. This could be a direct connection (physical connection) or an indirect connection via at least one intermediate component, as long as the circuit is connected. It could also refer to the internal connection between two components. Similarly, a signal connection can refer to a connection via a circuit or a medium, such as radio waves. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0033] The transistor in this application is a three-terminal transistor, with its three terminals being a control terminal, a first terminal, and a second terminal. The transistor can be a bipolar transistor (BPT) or a field-effect transistor (FET). For example, when the transistor is a BPT, its control terminal is the base of the BPT, the first terminal can be the collector or emitter of the BPT, and the corresponding second terminal can be the emitter or collector of the BPT. When the transistor is a FET, its control terminal is the gate of the FET, the first terminal can be the drain or source of the FET, and the corresponding second terminal can be the source or drain of the FET. Furthermore, the transistor in the following embodiments of this application can be an NMOS (N-Metal-Oxide-Semiconductor) transistor, and in other embodiments, the transistor can also be a PMOS (P-Metal-Oxide-Semiconductor) transistor.

[0034] In the embodiments of this application below, the body terminal is an external connection terminal of the body region, which is usually connected to an external circuit through a metal lead.

[0035] It can be understood that the switching converter circuit of this embodiment can operate in both forward charging and reverse discharging states, and the switching ratio of the switching converter can be adjusted. Thus, in some embodiments, when it is necessary to control two nodes in the circuit to conduct normally, the corresponding switching control circuit is controlled to operate so that the body terminal of the transistor is connected to its source. Conversely, when it is necessary to control two nodes in the circuit to turn off normally to prevent the body diode channel from conducting, the corresponding switching control circuit is controlled to operate so that the body terminal of the transistor is grounded or connected to a low potential, thereby cutting off the body diode channel.

[0036] In related technologies, switched-capacitor voltage converters are typically used to meet the fast charging requirements of electronic devices. These converters utilize energy storage capacitors as energy storage elements and control the on-time of switching transistors to change the capacitor connection method, thereby achieving various input-output voltage-to-current conversion ratios. For complex voltage conversion requirements, multi-stage architectures can be used to construct corresponding switched-capacitor voltage converters. The main application scenario for switched-capacitor voltage converters is mobile devices. Their advantages lie in high efficiency and the ability to achieve rapid charging in short periods. However, they limit the relative voltage range of input and output, and cannot support continuous forward or reverse voltage regulation and regulated output, making them unsuitable for certain application scenarios.

[0037] Figure 1 For a schematic diagram of the switched capacitor voltage conversion circuit provided for related technologies, please refer to [link / reference]. Figure 1As shown, the switched capacitor voltage conversion circuit includes an input terminal A1, an output terminal A2, a 21st transistor Q21, a 22nd transistor Q22, a 23rd transistor Q23, a 24th transistor Q24, a 25th transistor Q25, a 26th transistor Q26, a 27th transistor Q27, a 28th transistor Q28, a 29th transistor Q29, a 30th transistor Q30, a 21st capacitor C21, and a 22nd capacitor C22. In this embodiment, the 21st transistor Q21, the 22nd transistor Q22, the 23rd transistor Q23, the 24th transistor Q24, the 25th transistor Q25, the 26th transistor Q26, the 27th transistor Q27, the 28th transistor Q28, the 29th transistor Q29, and the 30th transistor Q30 are all NMOS (N-Metal-Oxide-Semiconductor) transistors.

[0038] In this configuration, the drain of the twenty-first transistor Q21 is connected to the input terminal A1. The source of the twenty-first transistor Q21 is connected to the first terminal of the twenty-first capacitor C21 and the drain of the twenty-third transistor Q23. The second terminal of the twenty-first capacitor C21 is connected to the drain of the twenty-second transistor Q22 and the source of the twenty-fourth transistor Q24. The source of the twenty-second transistor Q22 is grounded. The drain of the twenty-fourth transistor Q24 is connected to the first terminal of the twenty-third capacitor C23 and the drain of the twenty-eighth transistor Q28. The second terminal of the twenty-third capacitor C23 is connected to the source of the twenty-ninth transistor Q29 and the thirtieth transistor Q30. The drain of the twenty-ninth transistor Q29 is connected to the source of the twenty-eighth transistor Q28. The source of the twenty-eighth transistor Q28 and the drain of the twenty-ninth transistor Q29 are both connected to the output terminal A2. The source of the twenty-third transistor Q23 is connected to the drain of the twenty-fifth transistor Q25 and the first terminal of the twenty-second capacitor C22. The source of the twenty-fifth transistor Q25 is connected to the output terminal A2 and the drain of the twenty-sixth transistor Q26. The source of the twenty-sixth transistor Q26 is connected to the drain of the twenty-seventh transistor Q27 and the second terminal of the twenty-second capacitor C22. The source of the twenty-seventh transistor Q27 is grounded. Among them, the gates of transistors Q21 (21), Q22 (22), Q23 (23), Q24 (24), Q25 (25), Q26 (26), Q27 (27), Q28 (28), Q29 (29), and Q30 (30) are all connected to the control unit to receive corresponding on / off control signals, control the conduction or off of each transistor, thereby controlling the operation of the switched capacitor voltage conversion circuit to achieve the purpose of voltage conversion.

[0039] Based on the above Figure 1 The switched capacitor voltage converter circuit shown receives the input voltage PMID1 at input terminal A1 during each charging stage. After conversion by the circuit, the output voltage VOUT1 is output at output terminal A2. In the first stage of each operating cycle, transistors Q21, Q24, Q29, Q25, and Q27 are on, while transistors Q22, Q23, Q26, Q28, and Q30 are off. At this time, the voltage conversion ratio between input voltage PMID1 and output voltage VOUT1 is 4:1. Input voltage PMID1 charges capacitors C21 and C23, storing energy. Capacitor C22 discharges through transistor Q25 to output terminal A2. At this time, the voltage across capacitor C21 is 2*VOUT1, and the voltages across capacitors C22 and C23 are both VOUT1. In the second phase of each working cycle, transistors Q21 (21), Q24 (24), Q29 (29), Q25 (25), and Q27 (27) are off, while transistors Q22 (22), Q23 (23), Q26 (26), Q28 (28), and Q30 (30) are on. At this time, the voltage conversion ratio between the input voltage PMID1 and the output voltage VOUT1 is 4:1. Capacitor C21 (21) discharges through transistor Q23 (23) to capacitor C22 (22), and the voltage across capacitor C21 (21) is 2*VOUT1. The voltages across capacitors C22 (22) and C23 (23) are both VOUT1.

[0040] It can be seen that, based on Figure 1 The switched-capacitor voltage converter circuit shown limits the relative input and output voltage range, and generally can only achieve a fixed voltage conversion ratio, for example... Figure 1 The switched capacitor voltage conversion circuit shown can only achieve a voltage conversion ratio of 4:1 and cannot support continuous forward or reverse voltage regulation and regulated output, making it unsuitable for some application scenarios.

[0041] To overcome the shortcomings of the aforementioned related technologies, this application provides a switching converter circuit, which includes: a first charge / discharge terminal, a second charge / discharge terminal, a first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit; the first terminal of the first voltage conversion circuit and the first terminal of the second voltage conversion circuit are both connected to the first charge / discharge terminal, the second terminals of the first voltage conversion circuit and the second voltage conversion circuit are both grounded, the third terminal of the first voltage conversion circuit is connected to the first terminal of the third voltage conversion circuit, the third terminal of the second voltage conversion circuit is connected to both the second charge / discharge terminal and the second terminal of the third voltage conversion circuit, and the third terminal of the third voltage conversion circuit is connected to the second charge / discharge terminal; the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are all used to receive corresponding on / off control signals, the on / off control signals being used to control the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit to operate in either a forward charging mode or a reverse discharging mode; wherein, when the first voltage conversion circuit... When the first, second, and third voltage conversion circuits are all operating in forward charging mode, the on / off control signal is used to control the first and second voltage conversion circuits to step down the first charging voltage input to the first charging terminal to obtain a second charging voltage, and to control the third voltage conversion circuit to step down the second charging voltage to obtain a third charging voltage; the third charging voltage is less than the second charging voltage, and the second charging terminal is used to output the third charging voltage. When the first, second, and third voltage conversion circuits are all operating in reverse discharging mode, the on / off control signal is used to control the third voltage conversion circuit to boost the first discharging voltage output from the second charging terminal to obtain a second discharging voltage, and to control the first and second voltage conversion circuits to boost the second discharging voltage to obtain a third discharging voltage; the third discharging voltage is greater than the second discharging voltage, and the first charging terminal is used to output the third discharging voltage. As can be seen, according to the switching converter circuit provided in this application, the first voltage conversion circuit, the second voltage conversion circuit and the third voltage conversion circuit can work together in each working cycle to achieve continuous voltage regulation with multiple turns ratios, expand the input and output voltage range, and support forward and reverse outputs to be suitable for various charging and discharging scenarios.

[0042] Figure 2 For one of the structural schematic diagrams of the switching converter circuit provided in the embodiments of this application, please refer to [link / reference]. Figure 1As shown in the embodiment of this application, the switching converter circuit includes: a first charging / discharging terminal S1, a second charging / discharging terminal S2, a first voltage conversion circuit 21, a second voltage conversion circuit 22, and a third voltage conversion circuit 23; the first terminal of the first voltage conversion circuit 21 and the first terminal of the second voltage conversion circuit 22 are both connected to the first charging / discharging terminal S1, the second terminals of the first voltage conversion circuit 21 and the second terminals of the second voltage conversion circuit 22 are both grounded, and the third terminal of the first voltage conversion circuit 21 is connected to the first terminal of the third voltage conversion circuit 23. The third terminal of voltage conversion circuit 22 is connected to the second charge / discharge terminal S2 and the second terminal of the third voltage conversion circuit 23, respectively. The third terminal of the third voltage conversion circuit 23 is connected to the second charge / discharge terminal S2. The first voltage conversion circuit 21, the second voltage conversion circuit 22, and the third voltage conversion circuit 23 are all used to receive corresponding on / off control signals. The on / off control signals are used to control the first voltage conversion circuit 21, the second voltage conversion circuit 22, and the third voltage conversion circuit 23 to operate in either a forward charging mode or a reverse discharging mode. When the first voltage conversion circuit 22... When the first voltage conversion circuit 21, the second voltage conversion circuit 22, and the third voltage conversion circuit 23 are all operating in forward charging mode, the on / off control signal is used to control the first voltage conversion circuit 21 and the second voltage conversion circuit 22 to step down the first charging voltage input to the first charging / discharging terminal S1 to obtain a second charging voltage, and to control the third voltage conversion circuit 23 to step down the second charging voltage to obtain a third charging voltage; the third charging voltage is less than the second charging voltage, and the second charging / discharging terminal S2 is used to output the third charging voltage. When the first voltage conversion circuit S1, the second voltage conversion circuit S2, and the third voltage conversion circuit S3 are all operating in reverse discharging mode, the on / off control signal is used to control the third voltage conversion circuit 23 to step up the first discharging voltage output to the second charging / discharging terminal S2 to obtain a second discharging voltage, and to control the first voltage conversion circuit 21 and the second voltage conversion circuit 22 to step up the second discharging voltage to obtain a third discharging voltage; the third discharging voltage is greater than the second discharging voltage, and the first charging / discharging terminal S1 is used to output the third discharging voltage.

[0043] As can be seen, according to the switching converter circuit provided in this application, the first voltage conversion circuit, the second voltage conversion circuit and the third voltage conversion circuit can work together in each working cycle to achieve continuous voltage regulation with multiple turns ratios, expand the input and output voltage range, and support forward and reverse outputs to be suitable for various charging and discharging scenarios.

[0044] In one embodiment of this application, both the first voltage conversion circuit 21 and the second voltage conversion circuit 22 can be switched capacitor voltage conversion circuits, and the third voltage conversion circuit 23 can be a combination of one or more of the following: a two-level topology circuit, a three-level topology circuit, or a charge pump circuit. The switched capacitor voltage conversion circuit and the three-level topology circuit cooperate to improve voltage conversion efficiency and simultaneously achieve continuous voltage regulation with multiple turns ratios, expanding the input and output voltage range to suit various charging and discharging scenarios.

[0045] In one embodiment of this application, the first voltage conversion circuit 21 includes a first capacitor C1 and a plurality of transistors, and the first voltage conversion circuit 21 is a switched capacitor voltage conversion circuit composed of the first capacitor C1 and the plurality of transistors; the second voltage conversion circuit 22 includes a second capacitor C2 and a plurality of transistors, and the second voltage conversion circuit 22 is a switched capacitor voltage conversion circuit composed of the second capacitor C2 and the plurality of transistors; the third voltage conversion circuit 23 includes a third capacitor C3, a first inductor L1 and a plurality of transistors, and the third voltage conversion circuit 23 is one of a two-level voltage conversion circuit, a three-level voltage conversion circuit, or a charge pump circuit composed of the third capacitor C3, the first inductor L1 and the plurality of transistors; it is understood that the third voltage conversion circuit 23 can be switched to different circuit configurations by switching each transistor in the third voltage conversion circuit 23 to different states (on state or off state). For example, in different application scenarios, it can be switched to one of a two-level voltage conversion circuit, a three-level voltage conversion circuit, or a charge pump circuit to achieve different voltage conversion effects.

[0046] Please continue reading Figure 2As shown, the switching converter circuit further includes a first transistor Q1 and a third transistor Q3. The first terminal of the first transistor Q1 is connected to the first charge / discharge terminal, and the second terminal of the first transistor Q1 is connected to the first terminal of the first voltage conversion circuit 21 and the first terminal of the third transistor Q3, respectively. The second terminal of the third transistor Q3 is connected to the first terminal of the second voltage conversion circuit 22. The control terminals of the first transistor Q1 and the third transistor Q2 are both used to receive the on / off control signal, which is used to control the conduction and off of the corresponding transistors. By controlling the conduction or off of the first transistor Q1, the first voltage conversion circuit 21 and the second voltage conversion circuit 22 can be controlled to be connected to the first charge / discharge terminal S1, thereby controlling the first charge / discharge terminal S1 to charge or disconnect the first voltage conversion circuit 21 and the second voltage conversion circuit 22. By controlling the conduction or off of the third transistor Q3, the first voltage conversion circuit 21 and the second voltage conversion circuit 22 can be controlled to be connected to each other, so as to realize energy conversion and further voltage conversion.

[0047] In this embodiment, both the first transistor Q1 and the third transistor Q3 are NMOS transistors, with their first electrode being the drain, their second electrode being the source, and their control electrode being the gate.

[0048] Please continue reading Figure 2 As shown, the first voltage conversion circuit 21 provided in this embodiment further includes a second transistor Q2 and a fourth transistor Q4. The first terminal of the first capacitor C1 is the first terminal of the first voltage conversion circuit 21. The second terminal of the first capacitor C1 is connected to the first terminal of the second transistor Q2 and the second terminal of the fourth transistor Q4. The second terminal of the second transistor Q2 is grounded. The first terminal of the fourth transistor Q4 is the third terminal of the first voltage conversion circuit 21. The first terminal of the fourth transistor Q4 is connected to the first terminal of the third capacitor C4. The control terminals of the second transistor Q2 and the fourth transistor Q4 are both used to receive the on / off control signal. The on / off control signal is used to control the second transistor Q2 and the fourth transistor Q4 to be turned on or off, thereby controlling the first voltage conversion circuit 21 to work in various modes or different states.

[0049] In this embodiment, the second transistor Q2 and the fourth transistor Q4 are both NMOS transistors, with their first electrode being the drain, their second electrode being the source, and their control electrode being the gate.

[0050] Please continue reading Figure 2As shown, in one embodiment of this application, the second voltage conversion circuit 22 includes a fifth transistor Q5, a sixth transistor Q6, and a seventh transistor Q7. The first terminal of the fifth transistor Q5 is the first terminal of the second voltage conversion circuit 22. The first terminal of the fifth transistor Q5 is connected to the second terminal of the third transistor Q3 and the first terminal of the second capacitor C2. The second terminal of the fifth transistor Q5 is connected to the second charge / discharge terminal S2 and the first terminal of the sixth transistor Q6. The second terminal of the fifth transistor Q5 and the first terminal of the sixth transistor Q6 form the third terminal of the second voltage conversion circuit 22. The second terminal of the sixth transistor Q6 is connected to the first terminal of the seventh transistor Q7 and the second terminal of the second capacitor C2. The second terminal of the seventh transistor Q7 is grounded. The control terminals of the fifth transistor Q5, the sixth transistor Q6, and the seventh transistor Q7 are all used for the on / off control signal. The on / off control signal is used to control the conduction or off of the fifth transistor Q5, the sixth transistor Q6, and the seventh transistor Q7, thereby controlling the second voltage conversion circuit 22 to operate in various modes or different states.

[0051] In this embodiment, the fifth transistor Q5, the sixth transistor Q6, and the seventh transistor Q7 are all NMOS transistors, with their first electrode being the drain, their second electrode being the source, and their control electrode being the gate.

[0052] Please continue reading Figure 2As shown, in one embodiment of this application, the third voltage conversion circuit 23 further includes an eighth transistor Q8, a ninth transistor Q9, a tenth transistor Q10, an eleventh transistor Q11, and a twelfth transistor Q12; the first terminal of the eighth transistor Q8 is connected to the first terminal of the third capacitor C3 and the first terminal of the eleventh transistor Q11, respectively, and the first terminal of the eighth transistor Q8, the first terminal of the third capacitor C3, and the first terminal of the eleventh transistor Q11 together form the first terminal of the third voltage conversion circuit 23; the second terminal of the eighth transistor Q8 and the first terminal of the ninth transistor Q9 together form the third voltage conversion circuit 23. At the third terminal of circuit 23, the second terminal of the eighth transistor Q8 is connected to the first terminal of the ninth transistor and the second charge / discharge terminal, respectively. The second terminal of the ninth transistor Q9 is connected to the first terminal of the tenth transistor Q10 and the second terminal of the third capacitor C3, respectively. The second terminal of the eleventh transistor Q11 is connected to the first terminal of the twelfth transistor Q12 and the first terminal of the first inductor L1, respectively. The second terminal of the first inductor L1 is the second terminal of the third voltage conversion circuit 23. The second terminal of the first inductor L1 is connected to the second charge / discharge terminal S2, the second terminal of the fifth transistor Q5 and the first terminal of the sixth transistor Q6, respectively.

[0053] In this embodiment, the control terminals of the eighth transistor Q8, the ninth transistor Q9, the tenth transistor Q10, the eleventh transistor Q11, and the twelfth transistor Q12 are all used to receive the on / off control signal. The on / off control signal is used to control the conduction or cutoff of the eighth transistor Q8, the ninth transistor Q9, the tenth transistor Q10, the eleventh transistor Q11, and the twelfth transistor Q12, thereby controlling the third voltage conversion circuit 23 to operate in various modes or different states.

[0054] The second terminal of the twelfth transistor Q12 is connected to the second terminal of the third capacitor C3, the second terminal of the ninth transistor Q9, and the first terminal of the tenth transistor Q10; or the second terminal of the twelfth transistor Q12 is grounded.

[0055] When the second terminal of the twelfth transistor Q12 is connected to the second terminal of the third capacitor C3, the eighth transistor Q8, the ninth transistor Q9, the tenth transistor Q10, the eleventh transistor Q11, the twelfth transistor Q12, the first inductor L1, and the third capacitor C3 form a three-level voltage conversion circuit. When the second terminal of the twelfth transistor Q12 is grounded, the eighth transistor Q8, the ninth transistor Q9, the tenth transistor Q10, the eleventh transistor Q11, the twelfth transistor Q12, the first inductor L1, and the third capacitor C3 form a two-level voltage conversion circuit, namely a traditional Buck circuit (step-down converter circuit) and a Boost circuit (step-up converter circuit). When working in forward charging, it is a Buck circuit; when discharging in reverse, it is a Boost circuit. In this way, by controlling the duty cycle, continuous voltage regulation in either forward or reverse direction can be achieved. Thus, when the switching converter circuit operates in forward buck mode, it performs forward buck processing on the first charging voltage PMID input to the first charging / discharging terminal S1 and outputs the first discharging voltage VOUT at the second charging / discharging terminal S2; conversely, when the switching converter circuit operates in reverse boost mode, it performs reverse boost processing on the first discharging voltage VOUT output from the second charging / discharging terminal S2 and then outputs the boosted first charging voltage PMID through the first charging / discharging terminal S1.

[0056] In one embodiment of this application, when Figure 2 When the switching converter circuit shown operates in two-level voltage conversion mode, the third capacitor C3 is magnetized by the tenth transistor Q10 or the twelfth transistor Q12, and demagnetized by the eleventh transistor Q11. At this time, since the switching converter circuit is operating in two-level voltage conversion mode, the voltage value of C3N will not be higher than VOUT, and the voltage of C3P will not be lower than VOUT. Therefore, a corresponding switching control circuit needs to be set to prevent current backflow.

[0057] According to the switching converter circuit provided in the embodiments of this application, in one embodiment, the switched capacitor voltage conversion circuit and the three-level voltage conversion circuit can work together. The three-level voltage conversion circuit can improve the stability of the output voltage, and the switched capacitor voltage conversion circuit can improve the voltage conversion efficiency while increasing the voltage conversion ratio. This is more efficient than simply using the three-level voltage conversion circuit on the right side, and the circuit operation is more stable.

[0058] based on Figure 2Based on the switching converter circuit shown, this embodiment also provides the following various deformable circuits to achieve the same technical effects as the circuits described above.

[0059] Figure 3 For the second schematic diagram of the switching converter circuit structure provided in the embodiments of this application, please refer to [link / reference]. Figure 3 As shown, in one embodiment of this application, when the second terminal of the twelfth transistor Q12 is connected to the second terminal of the third capacitor C3, the second terminal of the ninth transistor Q9, and the first terminal of the tenth transistor Q10 respectively: the switching converter circuit further includes a first switching circuit, which is connected to the body terminal of the eighth transistor Q8. The first switching circuit is used to receive a first switching control signal, which is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor Q8 to the source terminal or common ground of the eighth transistor Q8.

[0060] In one embodiment of this application, the embodiment provides as follows: Figure 3 The switching converter circuit shown is Figure 3 The switching converter circuit shown can achieve stable voltage conversion of three electrical components. By controlling the operation of the first switching circuit, the body terminal of the eighth transistor Q8 can be connected to the source terminal or common ground of the eighth transistor Q8, so as to control whether the body diode channel of the eighth transistor Q8 is turned on, thereby preventing current backflow and ensuring the normal operation of the circuit.

[0061] Figure 4 For the third schematic diagram of the switching converter circuit provided in the embodiments of this application, please refer to [link / reference]. Figure 4 As shown, in one embodiment of this application, the switching converter circuit further includes a second switching circuit; the second switching circuit is connected to the body terminal of the ninth transistor Q9, and the second switching circuit is used to receive a second switching control signal, which is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor Q9 to the source terminal of the eighth transistor Q8 or to a common ground.

[0062] Figure 5 For the fourth schematic diagram of the switching converter circuit provided in the embodiments of this application, please refer to [link / reference]. Figure 5As shown, in one embodiment of this application, the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor Q8. The first switching circuit is used to receive a first switching control signal, which is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor Q8 to the source terminal or common ground of the eighth transistor Q8. The second switching circuit is connected to the body terminal of the ninth transistor Q9. The second switching circuit is used to receive a second switching control signal, which is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor Q9 to the source terminal or common ground of the ninth transistor Q9.

[0063] Figure 6 For the fifth schematic diagram of the switching converter circuit provided in the embodiments of this application, please refer to [link to schematic diagram]. Figure 6 As shown, in one embodiment of this application, when the second terminal of the twelfth transistor Q12 is connected to the second terminal of the third capacitor C3, the second terminal of the ninth transistor Q9, and the first terminal of the tenth transistor Q10 respectively: the switching converter circuit further includes a thirteenth transistor Q13 and a third switching circuit. The first terminal of the thirteenth transistor Q13 is connected to the second terminal of the eighth transistor Q8 and the first terminal of the ninth transistor Q9 respectively. The second terminal of the thirteenth transistor Q13 is connected to the second charge / discharge terminal S3. The control terminal of the thirteenth transistor Q13 is used to receive an on / off control signal, which is used to control the conduction and turn-off of the thirteenth transistor Q13. The third switching circuit is connected to the body terminal of the thirteenth transistor Q13. The third switching circuit is used to receive a third switching control signal, which is used to control the operation of the third switching circuit, thereby connecting the body terminal of the thirteenth transistor Q13 to the source terminal or common ground of the thirteenth transistor Q13.

[0064] Figure 7 For the sixth schematic diagram of the switching converter circuit provided in the embodiments of this application, please refer to [the diagram]. Figure 7As shown, in one embodiment of this application, when the second terminal of the twelfth transistor Q12 is connected to the second terminal of the third capacitor C3, the second terminal of the ninth transistor Q9, and the first terminal of the tenth transistor Q10, respectively; the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor Q8. The first switching circuit is used to receive a first switching control signal, which is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor Q8 to the source terminal or common ground of the eighth transistor Q8; the second switching circuit is connected to the body terminal of the ninth transistor. The second switching circuit is used to receive a second ... control signal is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor Q8 to the source terminal or common ground of the eighth transistor Q8. The second switching circuit is controlled to operate, thereby connecting the body terminal of the ninth transistor Q9 to its source or common ground. The switching converter circuit also includes a fourteenth transistor Q14, the first terminal of which is connected to the second terminal of the first transistor Q1, the first terminal of the first capacitor C1, and the first terminal of the third transistor Q3. The second terminal of the fourteenth transistor Q14 is connected to the first terminal of the fourth transistor Q4, the first terminal of the third capacitor C3, the first terminal of the eighth transistor Q8, and the first terminal of the eleventh transistor Q11. The control terminal of the fourteenth transistor Q14 is used to receive an on / off control signal, which is used to control the on and off states of the fourteenth transistor Q14.

[0065] Since the C3P point in the switching converter circuit structure of the above embodiments is connected to the first charging and discharging terminal S1 through the first capacitor C1 and the first transistor Q1, and the voltage on the first capacitor C1 can only be several times VOUT, the above circuit structure cannot achieve a boost output of 1-2 times VOUT.

[0066] To overcome the above technical problems, please refer to Figure 7 As shown, in this embodiment, a fourteenth transistor Q14 is connected in series between points C1P and C3P, as follows. Figure 7 As shown, in reverse voltage regulation, the voltage at point C3P can be directly output from the fourteenth transistor Q14 to C1P, and then output to the first charge / discharge terminal S1 through the first transistor Q1, without needing to output through the first capacitor C1. Therefore, the output voltage ratio can be as low as 1-2 times.

[0067] Figure 8 For the seventh schematic diagram of the switching converter circuit provided in the embodiments of this application, please refer to [the diagram description]. Figure 8As shown, in one embodiment of this application, when the second terminal of the twelfth transistor Q12 is connected to the second terminal of the third capacitor C3, the second terminal of the ninth transistor Q9, and the first terminal of the tenth transistor Q10, the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor Q8. The first switching circuit is used to receive a first switching control signal, which is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor Q8 to the source terminal or common ground. The second switching circuit is connected to the ninth transistor Q9. The body terminal of transistor Q9 is connected to the second switching circuit, which receives a second switching control signal. The second switching control signal controls the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor Q9 to the source terminal or common ground. The switching converter circuit also includes a fifteenth transistor Q15. The first terminal of the fifteenth transistor Q15 is connected to the first terminal of the first transistor Q1 and the first charge / discharge terminal S1, respectively. The second terminal of the fifteenth transistor Q15 is connected to the first terminal of the fourth transistor Q4, the first terminal of the third capacitor C3, the first terminal of the eighth transistor Q8, and the first terminal of the eleventh transistor Q11, respectively. The control terminal of the fifteenth transistor Q15 receives an on / off control signal, which controls the conduction and turn-off of the fifteenth transistor Q15.

[0068] Please see Figure 8 As shown, in this embodiment, a fifteenth transistor Q15 is connected in series between the first charge / discharge terminal S1 and point C3P, as follows: Figure 8 As shown, in reverse voltage regulation, the voltage at point C3P can be directly output from the fifteenth transistor Q15 to the first charge / discharge terminal S1. The voltage is output through the fifteenth transistor Q15 to the first charge / discharge terminal S1 without needing to be output through the first capacitor C1. Therefore, the output voltage ratio can be as low as 1-2 times.

[0069] Figure 9 For the eighth schematic diagram of the switching converter circuit provided in the embodiments of this application, please refer to [link to schematic diagram]. Figure 9As shown, in one embodiment of this application, when the second terminal of the twelfth transistor Q12 is connected to the second terminal of the third capacitor C3, the second terminal of the ninth transistor Q9, and the first terminal of the tenth transistor Q10, the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor Q8. The first switching circuit is used to receive a first switching control signal, which is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor Q8 to the source terminal or common ground of the eighth transistor Q8. The second switching circuit is connected to the ninth transistor Q9. The body terminal of transistor Q9 is connected to the second switching circuit, which receives a second switching control signal. The second switching control signal is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor Q9 to the source terminal or common ground of the ninth transistor Q9. The switching converter circuit also includes a sixteenth transistor Q16, the second terminal of the sixteenth transistor Q16 is connected to the first charge / discharge terminal S1, the first terminal of the sixteenth transistor Q16 is connected to the first terminal of the first transistor Q1, and the control terminal of the sixteenth transistor Q16 is used to receive an on / off control signal, which is used to control the conduction and turn-off of the sixteenth transistor Q16.

[0070] In the above Figure 7 and Figure 8 Based on the switching converter circuit shown, in this embodiment, please refer to... Figure 9 As shown, a sixteenth transistor Q16 is connected in series between the first charge / discharge terminal S1 and the first electrode of the first transistor Q1. During part of the operation, by controlling the sixteenth transistor Q16 to switch to the off state, the reverse current flowing out from the first electrode of the first transistor Q1 can be blocked, thus preventing the first charge / discharge terminal S1 from being charged.

[0071] Figure 10 For the ninth schematic diagram of the switching converter circuit provided in the embodiments of this application, please refer to [the original text]. Figure 10As shown, in one embodiment of this application, when the second terminal of the twelfth transistor Q12 is connected to the second terminal of the third capacitor C3, the second terminal of the ninth transistor Q9, and the first terminal of the tenth transistor Q10, the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor Q8. The first switching circuit is used to receive a first switching control signal, which is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor Q8 to the source terminal or common ground of the eighth transistor Q8. The second switching circuit is connected to... The body terminal of the ninth transistor Q9 is connected to the second switching circuit, which receives a second switching control signal. The second switching control signal controls the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor Q9 to the source or common ground of the ninth transistor Q. The switching converter circuit further includes a fourth switching circuit, which is connected to the body terminal of the fifth transistor Q5. The fourth switching circuit receives a fourth switching control signal, which controls the operation of the fourth switching circuit, thereby connecting the body terminal of the fifth transistor Q5 to the source or common ground of the fifth transistor.

[0072] based on Figure 10 The switching converter circuit shown has a fourth switching circuit on the fifth transistor Q5. During some operating phases, the fourth switching circuit can be controlled to connect the body terminal of the fifth transistor Q5 to the common ground or a low potential, thereby blocking reverse current and ensuring normal circuit operation.

[0073] Figure 11 For the tenth schematic diagram of the switching converter circuit provided in the embodiments of this application, please refer to [link / reference]. Figure 11As shown, in one embodiment of this application, when the second terminal of the twelfth transistor Q12 is connected to the second terminal of the third capacitor C3, the second terminal of the ninth transistor Q9, and the first terminal of the tenth transistor Q10, the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor Q8. The first switching circuit is used to receive a first switching control signal, which is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor Q8 to the source terminal or common ground of the eighth transistor Q8. The second switching circuit is connected to the body terminal of the ninth transistor Q9. The second switching circuit is used to receive a second switching control signal, which is used to control the operation of the second switching circuit. The switching converter circuit further includes a fifth switching switch and a sixth switching switch. The fifth switching circuit is connected to the body terminal of the fifth transistor Q5. The fifth switching circuit is used to receive a fifth switching control signal, which is used to control the operation of the fifth switching circuit, thereby connecting the body terminal of the fifth transistor Q5 to the source terminal of the fifth transistor Q5 or to the common ground. The sixth switching circuit is connected to the body terminal of the eleventh transistor Q11. The sixth switching circuit is used to receive a sixth switching control signal, which is used to control the operation of the sixth switching circuit, thereby connecting the body terminal of the eleventh transistor Q11 to the source terminal of the eleventh transistor Q11 or to the common ground.

[0074] It should be noted that, regarding the above... Figure 7 , Figure 8 as well as Figure 9 The switching converter circuit shown has switching control circuits for the fifth transistor Q5, the eighth transistor Q8, the ninth transistor Q9, and the eleventh transistor Q11 to block reverse current and ensure normal circuit operation.

[0075] Figure 12 For the structural schematic diagram of the switching converter circuit provided in the embodiments of this application, please refer to section 11. Figure 12As shown, in one embodiment of this application, the third voltage conversion circuit 23 further includes an eighth transistor Q8, a ninth transistor Q9, a tenth transistor Q10, an eleventh transistor Q11, and a twelfth transistor Q12; the first terminal of the eighth transistor Q8 is connected to the first terminal of the third capacitor C3 and the first terminal of the eleventh transistor Q11, respectively, and the first terminal of the eighth transistor Q8, the first terminal of the third capacitor C3, and the first terminal of the eleventh transistor Q11 together form the first terminal of the third voltage conversion circuit 23; the second terminal of the eighth transistor Q8 and the first terminal of the ninth transistor Q9 together form the third terminal of the third voltage conversion circuit 23. The second terminal of the eighth transistor Q8 is connected to the first terminal of the ninth transistor and the second charge / discharge terminal, respectively. The second terminal of the ninth transistor Q9 is connected to the first terminal of the tenth transistor Q10 and the second terminal of the third capacitor C3, respectively. The second terminal of the eleventh transistor Q11 is connected to the first terminal of the twelfth transistor Q12 and the first terminal of the first inductor L1, respectively. The second terminal of the twelfth transistor Q12 is grounded. The second terminal of the first inductor L1 is the second terminal of the third voltage conversion circuit 23. The second terminal of the first inductor L1 is connected to the second charge / discharge terminal S2, the second terminal of the fifth transistor Q5, and the first terminal of the sixth transistor Q6, respectively.

[0076] Thus, according to Figure 12 The provided switching converter circuit consists of the eighth transistor Q8, the ninth transistor Q9, the tenth transistor Q10, the eleventh transistor Q11, and the twelfth transistor Q12, forming a two-level voltage conversion circuit that can achieve two-level voltage conversion.

[0077] Please continue reading Figure 2 As shown, in one embodiment, when the switching converter circuit operates in forward charging mode, in the first stage of a cycle, the third transistor Q3 and the eleventh transistor Q11 are turned on, thus discharging the second charge / discharge terminal S2 through the third transistor Q3 and the eleventh transistor Q11, and simultaneously energizing the inductor L to store energy. In the second stage, the third transistor Q3 and the eleventh transistor Q11 are turned off, and the twelfth transistor Q12 is turned on. At this time, the inductor L freewheels to discharge the second charge / discharge terminal S2, and the inductor L is in a demagnetized state. It can be understood that during reverse discharge, the current direction is opposite to the current direction during forward charging, but the control mode and operating cycle are the same, which will not be elaborated here.

[0078] The following uses this embodiment as an example. Figure 2 Taking the charging and discharging circuit shown as an example, some of its operating modes will be explained.

[0079] Figure 13This is a schematic diagram of the control signal waveform for the switching converter circuit operating in the first charging mode, as provided in an embodiment of this application. Figure 13 The waveforms of the control signals for each transistor are illustrated in the diagram. A high level indicates that the corresponding transistor is in the on state, and a low level indicates that the corresponding transistor is in the off state. When the second terminal of the twelfth transistor Q12 is connected to the second terminal of the third capacitor C3, the second terminal of the ninth transistor Q9, and the first terminal of the tenth transistor Q10, when the switching converter circuit operates in the first charging mode, the third voltage conversion circuit operates in the three-voltage stabilization mode. In any charging cycle, the control terminals of the eighth transistor Q8 and the ninth transistor Q9 are both used to receive the first turn-off control signal. The first turn-off control signal is used to control the eighth transistor Q8 and the ninth transistor Q9 to be in the off state during the charging cycle.

[0080] Please see Figure 13 As shown, when the charging and discharging circuit operates in the first charging mode: in the first stage of the charging cycle, the control terminals of the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the twelfth transistor Q12 are all used to receive a second turn-on control signal. The second turn-on control signal is used to control the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the twelfth transistor Q12 to be in the turn-on state in the first stage. The control terminals of the third transistor Q3, the sixth transistor Q6, the eleventh transistor Q11, the second transistor Q2, and the tenth transistor Q10 are all used to receive a second turn-off control signal. The second turn-off control signal is used to control the third transistor Q3, the sixth transistor Q6, the eleventh transistor Q11, the second transistor Q2, and the tenth transistor Q10 to be in the turn-off state in the first stage.

[0081] In the second stage of the charging cycle, the control terminals of the third transistor Q3, the sixth transistor Q6, the twelfth transistor Q12, the second transistor Q2, and the tenth transistor Q10 are all used to receive a third turn-on control signal. The third turn-on control signal is used to control the third transistor Q3, the sixth transistor Q6, the twelfth transistor Q12, the second transistor Q2, and the tenth transistor Q10 to be in the turn-on state in the second stage. The control terminals of the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 are all used to receive a third turn-off control signal. The third turn-off control signal is used to control the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 to be in the turn-off state in the second stage.

[0082] In the third stage of the charging cycle, the control terminals of the fifth transistor Q5, the seventh transistor Q7, the eleventh transistor Q11, the second transistor Q2, and the tenth transistor Q10 are all used to receive a fourth turn-on control signal. This fourth turn-on control signal controls the fifth transistor Q5, the seventh transistor Q7, the eleventh transistor Q11, the second transistor Q2, and the tenth transistor Q10 to be in a turned-on state during the third stage. The control terminals of the first transistor Q1, the fourth transistor Q4, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 are all used to receive a fourth turn-off control signal. This fourth turn-off control signal controls the first transistor Q1, the fourth transistor Q4, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 to be in a turned-off state during the third stage.

[0083] In the fourth stage of the charging cycle, the control terminals of the third transistor Q3, the sixth transistor Q6, the twelfth transistor Q12, the second transistor Q2, and the tenth transistor Q10 are all used to receive a fifth turn-on control signal. This fifth turn-on control signal controls the third transistor Q3, the sixth transistor Q6, the twelfth transistor Q12, and the second transistor Q2 to be in a turn-on state during the fourth stage. The control terminals of the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 are all used to receive a fifth turn-off control signal. This fifth turn-off control signal controls the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 to be in a turn-off state during the fourth stage.

[0084] In this embodiment, the on / off control signals include the first off control signal, the second off control signal, the third off control signal, the fourth off control signal, the fifth off control signal, the second on control signal, the third on control signal, the fourth on control signal, and the fifth on control signal.

[0085] When a high reverse conversion ratio and stable voltage output are required, taking a reverse output voltage with a conversion ratio of 1:4 to 1:5 as an example, Figure 2 , Figure 4 , Figure 5 The operating state of the transistor structure is as follows Figure 13 As shown. The eighth transistor Q8 and the ninth transistor Q9 remain off. In the phase when the first transistor Q1 is turned on and outputs current, the voltage across the first capacitor C1 is 2*VOUT, where VOUT is the voltage at the second charging terminal S2. The three-level boost voltage circuit composed of the third capacitor C3 and the first inductor L1 boosts the voltage at point C3P to 2*VOUT - 3*VOUT. The sum of these two voltages can achieve a voltage ratio of 1:4 to 1:5.

[0086] Figure 6 The control timing of transistors Q1-Q12 in the structure shown is also as follows. Figure 13 As shown, in addition Figure 6The unique thirteenth transistor Q13 needs to be kept off at all times to achieve a voltage ratio of 1:4 to 1:5. Understandably, when it is necessary to keep the thirteenth transistor Q13 off at all times, this can be achieved by controlling the third switching circuit to ground the body terminal of the thirteenth transistor Q13 or connect it to a lower potential.

[0087] As can be seen, in this embodiment, the coordinated operation of the first voltage conversion circuit 21, the second voltage conversion circuit 22, and the third voltage conversion circuit 23 can further reduce the voltage converted by the first voltage conversion circuit 21, and output a stable output voltage, achieving a continuously adjustable voltage range and improving voltage conversion efficiency. According to the test, compared with using the second voltage conversion circuit 22 alone for voltage conversion, the switching converter circuit provided in this embodiment has higher working efficiency and more stable output voltage.

[0088] Figure 14 This is a schematic diagram of the control signal waveform for the switching converter circuit operating in the second charging mode, as provided in the embodiments of this application. Figure 14 The diagram illustrates the waveforms of the control signals for each transistor. A high level indicates that the corresponding transistor is in the ON state, and a low level indicates that the corresponding transistor is in the OFF state. Please refer to [link to relevant documentation]. Figure 12 and Figure 14 As shown, when the second terminal of the twelfth transistor is grounded and the switching converter circuit operates in the second charging mode, the third voltage conversion circuit operates in the two-voltage stabilization mode. In any charging cycle: the third voltage conversion circuit 23 operates in the two-voltage stabilization mode. In any charging cycle: the control terminals of the eighth transistor Q8, the ninth transistor Q9, and the tenth transistor Q10 are all used to receive the sixth turn-off control signal. The sixth turn-off control signal is used to control the eighth transistor Q8, the ninth transistor Q9, and the tenth transistor Q10 to be in the turn-off state in the charging cycle.

[0089] In the first stage of the charging cycle, the control terminals of the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 are all used to receive a seventh turn-on control signal. The seventh turn-on control signal is used to control the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 to be in the turn-on state during the first stage. The control terminals of the second transistor Q2, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 are all used to receive a seventh turn-off control signal. The seventh turn-off control signal is used to control the second transistor Q2, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 to be in the turn-off state during the first stage.

[0090] In the second stage of the charging cycle, the control terminals of the second transistor Q2, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 are all used to receive an eighth turn-on control signal. The eighth turn-on control signal is used to control the second transistor Q2, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 to be in the turn-on state during the second stage. The control terminals of the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 are all used to receive an eighth turn-off control signal. The eighth turn-off control signal is used to control the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 to be in the turn-off state during the second stage.

[0091] In this embodiment, the on / off control signals include the sixth off control signal, the seventh off control signal, the eighth off control signal, the seventh on control signal, and the eighth on control signal.

[0092] It should be noted that, according to the switching converter circuit provided in this embodiment, the current direction is related when it is working in the forward charging and reverse discharging modes, but the control timing of each transistor is the same. Taking the third voltage conversion circuit 23 working in the three-electric stable voltage mode as an example, the control timing of the charging and discharging circuit in this embodiment when performing reverse discharging will be explained.

[0093] It is understood that in this embodiment, the current direction of the switching converter during reverse discharge is opposite to that during forward charging, but the control mode and working cycle are the same, which will not be elaborated here.

[0094] Please continue reading Figure 13 As shown, when the second terminal of the twelfth transistor Q12 is connected to the second terminal of the third capacitor C3, the second terminal of the ninth transistor Q9, and the first terminal of the tenth transistor Q10, when the switching converter circuit operates in the first discharge mode, the third voltage conversion circuit operates in the three-electric stable voltage mode. In any discharge cycle, the control terminals of the eighth transistor Q8 and the ninth transistor Q9 are both used to receive the ninth turn-off control signal. The ninth turn-off control signal is used to control the eighth transistor Q8 and the ninth transistor Q9 to be in the off state during the charging cycle.

[0095] In the first stage of the discharge cycle, the control terminals of the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the twelfth transistor Q12 are all used to receive a tenth turn-on control signal. The tenth turn-on control signal is used to control the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the twelfth transistor Q12 to be in the turn-on state in the first stage. The control terminals of the third transistor Q3, the sixth transistor Q6, the eleventh transistor Q11, the second transistor Q2, and the tenth transistor Q10 are all used to receive a tenth turn-off control signal. The tenth turn-off control signal is used to control the third transistor Q3, the sixth transistor Q6, the eleventh transistor Q11, the second transistor Q2, and the tenth transistor Q10 to be in the turn-off state in the first stage.

[0096] In the second stage of the discharge cycle, the control terminals of the third transistor Q3, the sixth transistor Q6, the twelfth transistor Q12, the second transistor Q2, and the tenth transistor Q10 are all used to receive an eleventh turn-on control signal. This eleventh turn-on control signal controls the third transistor Q3, the sixth transistor Q6, the twelfth transistor Q12, the second transistor Q2, and the tenth transistor Q10 to be in a turn-on state during the second stage. The control terminals of the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 are all used to receive an eleventh turn-off control signal. This eleventh turn-off control signal controls the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 to be in a turn-off state during the second stage.

[0097] In the third stage of the discharge cycle, the control terminals of the fifth transistor Q5, the seventh transistor Q7, the eleventh transistor Q11, the second transistor Q2, and the tenth transistor Q10 are all used to receive a twelfth turn-on control signal. This twelfth turn-on control signal controls the fifth transistor Q5, the seventh transistor Q7, the eleventh transistor Q11, the second transistor Q2, and the tenth transistor Q10 to be in a turn-on state during the third stage. The control terminals of the first transistor Q1, the fourth transistor Q4, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 are all used to receive a twelfth turn-off control signal. This twelfth turn-off control signal controls the first transistor Q1, the fourth transistor Q4, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 to be in a turn-off state during the third stage.

[0098] In the fourth stage of the discharge cycle, the control terminals of the third transistor Q3, the sixth transistor Q6, the twelfth transistor Q12, the second transistor Q2, and the tenth transistor Q10 are all used to receive a thirteenth turn-on control signal. This thirteenth turn-on control signal controls the third transistor Q3, the sixth transistor Q6, the twelfth transistor Q12, and the second transistor Q2 to be in a turn-on state during the fourth stage. The control terminals of the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 are all used to receive a thirteenth turn-off control signal. This thirteenth turn-off control signal controls the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 to be in a turn-off state during the fourth stage.

[0099] In this embodiment, the on / off control signal further includes the ninth off control signal, the tenth off control signal, the eleventh off control signal, the twelfth off control signal, the tenth on control signal, the eleventh on control signal, the twelfth on control signal, and the thirteenth on control signal.

[0100] It is understood that in this embodiment, the current direction of the switching converter during reverse discharge is opposite to that during forward charging, but the control mode and working cycle are the same, which will not be elaborated here.

[0101] Please continue reading Figure 12 and Figure 14 As shown, when the second terminal of the twelfth transistor Q12 is grounded and the switching converter circuit operates in the second discharge mode, the third voltage conversion circuit operates in the two-voltage stabilization mode. Within any discharge cycle: The control terminals of the eighth transistor Q8, the ninth transistor Q9, and the tenth transistor Q10 are all used to receive the fourteenth shutdown control signal, which controls the eighth transistor Q8, the ninth transistor Q9, and the tenth transistor Q10 to be in a shutdown state during the charging cycle.

[0102] In the first stage of the discharge cycle, the control terminals of the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 are all used to receive the fifteenth turn-on control signal. The fifteenth turn-on control signal is used to control the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 to be in the turn-on state during the first stage. The control terminals of the second transistor Q2, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 are all used to receive the fifteenth turn-off control signal. The fifteenth turn-off control signal is used to control the second transistor Q2, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 to be in the turn-off state during the first stage.

[0103] In the second stage of the charging cycle, the control terminals of the second transistor Q2, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 are all used to receive the sixteenth turn-on control signal. The sixteenth turn-on control signal is used to control the second transistor Q2, the third transistor Q3, the sixth transistor Q6, and the twelfth transistor Q12 to be in the turn-on state during the second stage. The control terminals of the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor are all used to receive the sixteenth turn-off control signal. The sixteenth turn-off control signal is used to control the first transistor Q1, the fourth transistor Q4, the fifth transistor Q5, the seventh transistor Q7, and the eleventh transistor Q11 to be in the turn-off state during the second stage.

[0104] In this embodiment, the on / off control signals include the fourteenth off control signal, the fifteenth off control signal, the sixteenth off control signal, the fifteenth on control signal, and the sixteenth on control signal.

[0105] Please see Figure 7 , Figure 8 as well as Figure 9 As shown, a transistor is added between the first capacitor C1 and the third capacitor C3. When the switching converter circuit is operating in reverse boost mode, the voltage on the third capacitor C3 can be directly output to the first charging terminal S1 through the added transistor. This can achieve a low-ratio reverse output voltage, such as a low-ratio voltage of 1:1 to 1:2.

[0106] Figure 15 This is a schematic diagram of the control signal waveform of the switching converter circuit provided in the embodiment of this application operating in the third charging mode. Figure 15 The waveforms of the control signals for each transistor are shown in the diagram. A high level indicates that the corresponding transistor is in the on state, and a low level indicates that the corresponding transistor is in the off state.

[0107] Please see Figure 7 , Figure 8 , Figure 9 as well as Figure 15 As shown, when the second terminal of the twelfth transistor Q12 is grounded, and the switching converter circuit operates in the third charging mode, the third voltage conversion circuit operates in the two-voltage stabilization mode. In any charging cycle: The control electrode of the first transistor Q1 is used to receive the seventeenth turn-on control signal, which controls the first transistor Q1 to be in the turn-on state throughout the charging cycle. The control electrodes of the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, the sixth transistor Q6, the seventh transistor Q7, the eighth transistor Q8, and the ninth transistor Q9 are all used to receive the seventeenth turn-off control signal, which controls the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, the sixth transistor Q6, the seventh transistor Q7, the eighth transistor Q8, and the ninth transistor Q9 to be in the turn-off state throughout the charging cycle.

[0108] In the first stage of the charging cycle, the control terminals of the eleventh transistor Q1 and the fourteenth transistor Q14 are both used to receive the eighteenth turn-on control signal. The eighteenth turn-on control signal is used to control the eleventh transistor Q1 and the fourteenth transistor Q4 to switch to the turn-on state in the first stage. The control terminals of the tenth transistor Q10 and the twelfth transistor Q12 are both used to receive the eighteenth turn-off control signal. The eighteenth turn-off control signal is used to control the tenth transistor Q10 and the twelfth transistor Q12 to switch to the turn-off state in the first stage.

[0109] In the second stage of the charging cycle, the control terminals of the twelfth transistor Q12 and the fourteenth transistor Q14 are both used to receive the nineteenth turn-on control signal. The nineteenth turn-on control signal is used to control the twelfth transistor Q12 and the fourteenth transistor Q14 to switch to the turn-on state in the second stage. The control terminals of the tenth transistor Q10 and the eleventh transistor Q11 are both used to receive the nineteenth turn-off control signal. The nineteenth turn-off control signal is used to control the tenth transistor Q10 and the eleventh transistor Q11 to switch to the turn-off state in the second stage.

[0110] In the third stage of the charging cycle, the control terminals of the eleventh transistor Q11 and the fourteenth transistor Q14 are both used to receive the twentieth turn-on control signal. The twentieth turn-on control signal is used to control the eleventh transistor Q11 and the fourteenth transistor Q14 to switch to the turn-on state in the third stage. The control terminals of the tenth transistor Q10 and the twelfth transistor Q12 are both used to receive the twentieth turn-off control signal. The twentieth turn-off control signal is used to control the tenth transistor Q10 and the twelfth transistor Q12 to switch to the turn-off state in the third stage.

[0111] In the fourth stage of the charging cycle, the control terminals of the tenth transistor Q10 and the eleventh transistor Q11 are both used to receive the twenty-first turn-on control signal. The twenty-first turn-on control signal is used to control the tenth transistor Q10 and the eleventh transistor Q11 to switch to the turn-on state in the fourth stage. The control terminals of the twelfth transistor Q12 and the fourteenth transistor Q14 are both used to receive the twenty-first turn-off control signal. The twenty-first turn-off control signal is used to control the twelfth transistor Q12 and the fourteenth transistor Q14 to switch to the turn-off state in the fourth stage.

[0112] In this embodiment, the on / off control signals include the seventeenth on control signal, the eighteenth on control signal, the nineteenth on control signal, the twentieth on control signal, the twenty-first on control signal, the seventeenth off control signal, the eighteenth off control signal, the nineteenth off control signal, the twentieth off control signal, and the twenty-first off control signal.

[0113] It is understood that in this embodiment, the current direction during reverse discharge is opposite to that during forward charging, but the control mode and duty cycle are the same, which will not be elaborated further here; please refer to the following. Figure 7 , Figure 8 , Figure 9 as well as Figure 15 As shown, this embodiment... Figure 7 , Figure 8 , Figure 9 The reverse discharge operating mode of the switch converter shown will be further explained.

[0114] Please see Figure 7 , Figure 8 , Figure 9 as well as Figure 15 As shown, in one embodiment of this application, when the second terminal of the twelfth transistor is grounded, and the switching converter circuit operates in the third discharge mode, the third voltage conversion circuit operates in a two-voltage stabilization mode, outputting a low transformation ratio voltage of 1:1-1:2 in reverse; within any discharge cycle: The control electrode of the first transistor Q1 is used to receive the twenty-second turn-on control signal, which controls the first transistor Q1 to be in the turn-on state throughout the charging cycle. The control electrodes of the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, the sixth transistor Q6, the seventh transistor Q7, the eighth transistor Q8, and the ninth transistor Q9 are all used to receive the twenty-second turn-off control signal, which controls the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, the sixth transistor Q6, the seventh transistor Q7, the eighth transistor Q8, and the ninth transistor Q9 to be in the turn-off state throughout the charging cycle.

[0115] In the first stage of the charging cycle, the control terminals of the eleventh transistor Q11 and the fourteenth transistor Q14 are both used to receive the twenty-third turn-on control signal. The twenty-third turn-on control signal is used to control the eleventh transistor Q11 and the fourteenth transistor Q14 to switch to the turn-on state in the first stage. The control terminals of the tenth transistor Q10 and the twelfth transistor Q12 are both used to receive the twenty-third turn-off control signal. The twenty-third turn-off control signal is used to control the tenth transistor Q10 and the twelfth transistor Q12 to switch to the turn-off state in the first stage.

[0116] In the second stage of the charging cycle, the control terminals of the twelfth transistor Q12 and the fourteenth transistor Q14 are both used to receive the twenty-fourth turn-on control signal. The twenty-fourth turn-on control signal is used to control the twelfth transistor Q12 and the fourteenth transistor Q14 to switch to the turn-on state in the second stage. The control terminals of the tenth transistor Q10 and the eleventh transistor Q11 are both used to receive the twenty-fourth turn-off control signal. The twenty-fourth turn-off control signal is used to control the tenth transistor Q10 and the eleventh transistor Q11 to switch to the turn-off state in the second stage.

[0117] In the third stage of the charging cycle, the control terminals of the eleventh transistor Q11 and the fourteenth transistor Q14 are both used to receive the twenty-fifth turn-on control signal. The twenty-fifth turn-on control signal is used to control the eleventh transistor Q11 and the fourteenth transistor Q14 to switch to the turn-on state in the third stage. The control terminals of the tenth transistor Q10 and the twelfth transistor Q12 are both used to receive the twenty-fifth turn-off control signal. The twenty-fifth turn-off control signal is used to control the tenth transistor Q10 and the twelfth transistor Q12 to switch to the turn-off state in the third stage.

[0118] In the fourth stage of the charging cycle, the control terminals of the tenth transistor Q10 and the eleventh transistor Q11 are both used to receive the twenty-sixth turn-on control signal. The twenty-sixth turn-on control signal is used to control the tenth transistor Q10 and the eleventh transistor Q11 to switch to the turn-on state in the fourth stage. The control terminals of the twelfth transistor Q12 and the fourteenth transistor Q14 are both used to receive the twenty-sixth turn-off control signal. The twenty-sixth turn-off control signal is used to control the twelfth transistor Q12 and the fourteenth transistor Q14 to switch to the turn-off state in the fourth stage.

[0119] In this embodiment, the on / off control signals include the 22nd on control signal, the 23rd on control signal, the 24th on control signal, the 25th on control signal, the 26th on control signal, the 22nd off control signal, the 23rd off control signal, the 24th off control signal, the 25th off control signal, and the 26th off control signal.

[0120] In one embodiment of this application, the switching converter circuit further includes a control circuit, the output terminal of which is connected to the control terminals of the first transistor Q1, the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, the sixth transistor Q6, the seventh transistor Q7, the eighth transistor Q8, the ninth transistor Q9, the tenth transistor Q9, the eleventh transistor Q10, the twelfth transistor Q12, the thirteenth transistor Q13, the fourteenth transistor Q14, and the fifteenth transistor Q15. The control circuit is connected to the control electrode of the sixteenth transistor Q16. It is used to output corresponding on / off control signals to the control electrodes of the first transistor Q1, the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, the sixth transistor Q6, the seventh transistor Q7, the eighth transistor Q8, the ninth transistor Q9, the tenth transistor Q10, the eleventh transistor Q11, the twelfth transistor Q12, the thirteenth transistor Q13, the fourteenth transistor Q14, the fifteenth transistor Q15, and the sixteenth transistor Q16, respectively, so as to control the switching converter circuit to operate in different charging or discharging modes.

[0121] In one embodiment of this application, the output terminal of the control circuit is connected to the control terminals of the first switching control circuit, the second switching control circuit, the third switching control circuit, the fourth switching control circuit, the fifth switching control circuit, and the sixth switching control circuit, respectively. The control circuit is used to output corresponding switching control signals to the control terminals of the first switching control circuit, the second switching control circuit, the third switching control circuit, the fourth switching control circuit, the fifth switching control circuit, and the sixth switching control circuit, respectively, to control the operation of the above-mentioned switching control circuits, thereby controlling the body terminal of the corresponding transistor to be connected to its source or common ground, thereby achieving the purpose of reversing the resistance current in different scenarios.

[0122] Specifically, the switching control circuit in this embodiment can be a controllable switch circuit. For example, one end of the controllable switch is connected to the body terminal of the eighth transistor Q8, and the other end of the controllable switch is connected to the source terminal of the eighth transistor Q8. Thus, by controlling the on or off state of the controllable switch, the connection between the body terminal and the source terminal of the eighth transistor Q8 can be controlled. Similarly, one end of the controllable switch can be connected to the body terminal of the eighth transistor Q8, and the other end can be grounded. Thus, by controlling the on or off state of the controllable switch, the ground terminal of the eighth transistor Q8 can be controlled. The body terminal is the external connection terminal of the body region, typically connected to an external circuit via a metal lead.

[0123] In one embodiment, when the battery system needs to have an external discharge function, the battery system includes two switching converter circuits as provided in the above embodiments.

[0124] As described above, when the switching converter circuit performs reverse discharge, in order to ensure the continuity of external discharge, this embodiment simultaneously sets up two switching converter circuits as provided in the above embodiment, and the phase difference between the two switching converter circuits is 50%. The first charge and discharge terminals of the two switching converter circuits are connected to each other, and the second charge and discharge terminals of the two switching converter circuits are connected to each other. In this way, when the two switching converter circuits work simultaneously with a phase difference of 50%, the continuity of output discharge can be guaranteed.

[0125] This application also provides a chip that includes a switching converter circuit as provided in any of the above embodiments; or the chip includes two switching converter circuits as provided in the above embodiments. The chip can achieve continuous voltage regulation with multiple turns ratios, expand the input and output voltage range, and support forward and reverse outputs to be suitable for various charging and discharging scenarios.

[0126] This application also provides a battery system, which includes the switching converter circuit provided in any of the above embodiments; or the battery system includes two switching converter circuits as provided in the above embodiments; the battery system can realize continuous voltage regulation with multiple turns ratios, expand the input and output voltage range, and can support forward and reverse output to be suitable for various charging and discharging scenarios.

[0127] This application also provides an electronic device, which includes at least one switching converter circuit as provided in the above embodiment. In another embodiment, the electronic device includes two switching converter circuits as provided in the above embodiment to achieve continuous voltage regulation with multiple turns ratios, expand the input and output voltage range, and support forward and reverse outputs to be suitable for various charging and discharging scenarios.

[0128] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A switching converter circuit, characterized in that, The switching converter circuit includes: a first charge / discharge terminal, a second charge / discharge terminal, a first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit; The first terminal of the first voltage conversion circuit and the first terminal of the second voltage conversion circuit are both connected to the first charge / discharge terminal. The second terminal of the first voltage conversion circuit and the second terminal of the second voltage conversion circuit are both grounded. The third terminal of the first voltage conversion circuit is connected to the first terminal of the third voltage conversion circuit. The third terminal of the second voltage conversion circuit is connected to the second charge / discharge terminal and the second terminal of the third voltage conversion circuit, respectively. The third terminal of the third voltage conversion circuit is connected to the second charge / discharge terminal. The first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are all used to receive corresponding on / off control signals. The on / off control signals are used to control the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit to operate in either a forward charging mode or a reverse discharging mode. When the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are all operating in the forward charging mode, the on / off control signal is used to control the first voltage conversion circuit and the second voltage conversion circuit to step down the first charging voltage input to the first charging terminal to obtain the second charging voltage, and to control the third voltage conversion circuit to step down the second charging voltage to obtain the third charging voltage; the third charging voltage is less than the second charging voltage, and the second charging terminal is used to output the third charging voltage; When the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are all operating in reverse discharge mode, the on / off control signal is used to control the third voltage conversion circuit to boost the first discharge voltage output from the second charge / discharge terminal to obtain the second discharge voltage, and to control the first voltage conversion circuit and the second voltage conversion circuit to boost the second discharge voltage to obtain the third discharge voltage; the third discharge voltage is greater than the second discharge voltage, and the first charge / discharge terminal is used to output the third discharge voltage.

2. The switching converter circuit according to claim 1, characterized in that, The first voltage conversion circuit includes a first capacitor and a plurality of transistors, and the first voltage conversion circuit is a switched capacitor voltage conversion circuit composed of the first capacitor and the plurality of transistors; The second voltage conversion circuit includes a second capacitor and a plurality of transistors, and the second voltage conversion circuit is a switched capacitor voltage conversion circuit composed of the second capacitor and the plurality of transistors; The third voltage conversion circuit includes a third capacitor, a first inductor, and multiple transistors. The third voltage conversion circuit is one of a two-level voltage conversion circuit, a three-level voltage conversion circuit, or a charge pump circuit composed of the third capacitor, the first inductor, and multiple transistors.

3. The switching converter circuit according to claim 2, characterized in that, The switching converter circuit further includes a first transistor and a third transistor. The first terminal of the first transistor is connected to the first charge / discharge terminal. The second terminal of the first transistor is connected to the first terminal of the first voltage conversion circuit and the first terminal of the third transistor, respectively. The second terminal of the third transistor is connected to the first terminal of the second voltage conversion circuit. The control electrodes of both the first transistor and the third transistor are used to receive the on / off control signal, which is used to control the on and off of the corresponding transistor.

4. The switching converter circuit according to claim 3, characterized in that, The first voltage conversion circuit further includes a second transistor and a fourth transistor. The first terminal of the first capacitor is the first terminal of the first voltage conversion circuit. The second terminal of the first capacitor is connected to the first terminal of the second transistor and the second terminal of the fourth transistor, respectively. The second terminal of the second transistor is grounded. The first terminal of the fourth transistor is the third terminal of the first voltage conversion circuit. The first terminal of the fourth transistor is connected to the first terminal of the third capacitor. The control electrode of the second transistor and the control electrode of the fourth transistor are both used to receive the on / off control signal, which is used to control the second transistor and the fourth transistor to be turned on or off.

5. The switching converter circuit according to claim 4, characterized in that, The second voltage conversion circuit includes a fifth transistor, a sixth transistor, and a seventh transistor. The first terminal of the fifth transistor is the first terminal of the second voltage conversion circuit. The first terminal of the fifth transistor is connected to the second terminal of the third transistor and the first terminal of the second capacitor. The second terminal of the fifth transistor is connected to the second charge / discharge terminal and the first terminal of the sixth transistor. The second terminal of the fifth transistor and the first terminal of the sixth transistor form the third terminal of the second voltage conversion circuit. The second terminal of the sixth transistor is connected to the first terminal of the seventh transistor and the second terminal of the second capacitor. The second terminal of the seventh transistor is grounded. The control electrodes of the fifth transistor, the sixth transistor, and the seventh transistor are all used for the on / off control signal, which is used to control the conduction or shutdown of the fifth transistor, the sixth transistor, and the seventh transistor.

6. The switching converter circuit according to claim 5, characterized in that, The third voltage conversion circuit also includes an eighth transistor, a ninth transistor, a tenth transistor, an eleventh transistor, and a twelfth transistor; The first terminal of the eighth transistor is connected to the first terminal of the third capacitor and the first terminal of the eleventh transistor, respectively. The first terminal of the eighth transistor, the first terminal of the third capacitor, and the first terminal of the eleventh transistor together form the first terminal of the third voltage conversion circuit. The second terminal of the eighth transistor and the first terminal of the ninth transistor together form the third terminal of the third voltage conversion circuit. The second terminal of the eighth transistor is connected to the first terminal of the ninth transistor and the second charge / discharge terminal, respectively. The second terminal of the ninth transistor is connected to the first terminal of the tenth transistor and the second terminal of the third capacitor, respectively. The second terminal of the eleventh transistor is connected to the first terminal of the twelfth transistor and the first terminal of the first inductor, respectively. The second terminal of the first inductor is the second terminal of the third voltage conversion circuit, and the second terminal of the first inductor is connected to the second charge / discharge terminal, the second terminal of the fifth transistor, and the first terminal of the sixth transistor, respectively. The control terminals of the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, and the twelfth transistor are all used to receive the on / off control signal, which is used to control the on or off state of the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, and the twelfth transistor. The second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor; or the second terminal of the twelfth transistor is grounded. Specifically, when the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, the twelfth transistor, the first inductor, and the third capacitor form a three-level voltage conversion circuit; when the second terminal of the twelfth transistor is grounded, the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, the twelfth transistor, the first inductor, and the third capacitor form a two-level voltage conversion circuit.

7. The switching converter circuit according to claim 6, characterized in that, When the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor respectively: The switching converter circuit further includes a first switching circuit, which is connected to the body terminal of the eighth transistor. The first switching circuit is used to receive a first switching control signal, which is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor to the source terminal or common ground of the eighth transistor. Alternatively, the switching converter circuit may further include a second switching circuit; the second switching circuit is connected to the body terminal of the ninth transistor, and the second switching circuit is used to receive a second switching control signal, which is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor to the source of the eighth transistor or to a common ground. Alternatively, the switching converter circuit may further include a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor. The first switching circuit is used to receive a first switching control signal, which is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor to the source terminal or a common ground terminal. The second switching circuit is connected to the body terminal of the ninth transistor. The second switching circuit is used to receive a second switching control signal, which is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor to the source terminal or a common ground terminal.

8. The switching converter circuit according to claim 6, characterized in that, When the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor respectively: The switching converter circuit further includes a thirteenth transistor and a third switching circuit. The first terminal of the thirteenth transistor is connected to the second terminal of the eighth transistor and the first terminal of the ninth transistor, respectively. The second terminal of the thirteenth transistor is connected to the second charge / discharge terminal. The control terminal of the thirteenth transistor is used to receive an on / off control signal, which is used to control the conduction and turn-off of the thirteenth transistor. The third switching circuit is connected to the body terminal of the thirteenth transistor. The third switching circuit is used to receive a third switching control signal. The third switching control signal is used to control the operation of the third switching circuit, thereby connecting the body terminal of the thirteenth transistor to the source terminal or common ground of the thirteenth transistor.

9. The switching converter circuit according to claim 7, characterized in that, When the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor and is used to receive a first switching control signal. The first switching control signal is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor to the source terminal or a common ground. The second switching circuit is connected to the body terminal of the ninth transistor and is used to receive a second switching control signal. The second switching control signal is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor to the source terminal or a common ground. The switching converter circuit further includes a fourteenth transistor. The first terminal of the fourteenth transistor is connected to the second terminal of the first transistor, the first terminal of the first capacitor, and the first terminal of the third transistor. The second terminal of the fourteenth transistor is connected to the first terminal of the fourth transistor, the first terminal of the third capacitor, the first terminal of the eighth transistor, and the first terminal of the eleventh transistor. The control terminal of the fourteenth transistor is used to receive an on / off control signal, which is used to control the on and off of the fourteenth transistor.

10. The switching converter circuit according to claim 7, characterized in that, When the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor and is used to receive a first switching control signal. The first switching control signal is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor to the source terminal or a common ground. The second switching circuit is connected to the body terminal of the ninth transistor and is used to receive a second switching control signal. The second switching control signal is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor to the source terminal or a common ground. The switching converter circuit further includes a fifteenth transistor. The first terminal of the fifteenth transistor is connected to the first terminal of the first transistor and the first charge / discharge terminal, respectively. The second terminal of the fifteenth transistor is connected to the first terminal of the fourth transistor, the first terminal of the third capacitor, the first terminal of the eighth transistor, and the first terminal of the eleventh transistor, respectively. The control terminal of the fifteenth transistor is used to receive an on / off control signal, which is used to control the conduction and turn-off of the fifteenth transistor.

11. The switching converter circuit according to claim 9, characterized in that, The switching converter circuit further includes a sixteenth transistor, the second terminal of which is connected to the first charge / discharge terminal, the first terminal of which is connected to the first terminal of the first transistor, and the control terminal of the sixteenth transistor for receiving an on / off control signal for controlling the conduction and off of the sixteenth transistor.

12. The switching converter circuit according to claim 7, characterized in that, When the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, the switching converter circuit further includes a first switching circuit and a second switching circuit. The first switching circuit is connected to the body terminal of the eighth transistor and is used to receive a first switching control signal. The first switching control signal is used to control the operation of the first switching circuit, thereby connecting the body terminal of the eighth transistor to the source terminal or a common ground. The second switching circuit is connected to the body terminal of the ninth transistor and is used to receive a second switching control signal. The second switching control signal is used to control the operation of the second switching circuit, thereby connecting the body terminal of the ninth transistor to the source terminal or a common ground. The switching converter circuit further includes a fourth switching circuit, which is connected to the body terminal of the fifth transistor. The fourth switching circuit is used to receive a fourth switching control signal, which is used to control the operation of the fourth switching circuit, thereby connecting the body terminal of the fifth transistor to the source terminal or common ground of the fifth transistor.

13. The switching converter circuit according to claim 9, characterized in that, The switching converter circuit also includes a fifth switching switch and a sixth switching switch; The fifth switching circuit is connected to the body terminal of the fifth transistor. The fifth switching circuit is used to receive a fifth switching control signal. The fifth switching control signal is used to control the operation of the fifth switching circuit, thereby connecting the body terminal of the fifth transistor to the source terminal or common ground of the fifth transistor. The sixth switching circuit is connected to the body terminal of the eleventh transistor. The sixth switching circuit is used to receive a sixth switching control signal. The sixth switching control signal is used to control the operation of the sixth switching circuit, thereby connecting the body terminal of the eleventh transistor to the source terminal or common ground of the eleventh transistor.

14. The switching converter circuit according to claim 7, characterized in that, When the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, respectively, and when the switching converter circuit operates in the first charging mode, the third voltage conversion circuit operates in the three-electric-voltage stabilization mode. In any charging cycle: The control electrode of the eighth transistor and the control electrode of the ninth transistor are both used to receive a first shutdown control signal. The first shutdown control signal is used to control the eighth transistor and the ninth transistor to be in a shutdown state during the charging cycle. In the first stage of the charging cycle, the control electrodes of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the twelfth transistor are all used to receive a second turn-on control signal. The second turn-on control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the twelfth transistor to be in the turn-on state in the first stage. The control electrodes of the third transistor, the sixth transistor, the eleventh transistor, the second transistor, and the tenth transistor are all used to receive a second turn-off control signal. The second turn-off control signal is used to control the third transistor, the sixth transistor, the eleventh transistor, the second transistor, and the tenth transistor to be in the turn-off state in the first stage. In the second stage of the charging cycle, the control terminals of the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor are all used to receive a third turn-on control signal. The third turn-on control signal is used to control the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor to be in the turn-on state in the second stage. The control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a third turn-off control signal. The third turn-off control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in the turn-off state in the second stage. In the third stage of the charging cycle, the control terminals of the fifth transistor, the seventh transistor, the eleventh transistor, the second transistor, and the tenth transistor are all used to receive a fourth turn-on control signal. This fourth turn-on control signal controls the fifth transistor, the seventh transistor, the eleventh transistor, the second transistor, and the tenth transistor to be in a turn-on state during the third stage. The control terminals of the first transistor, the fourth transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive a fourth turn-off control signal. This fourth turn-off control signal controls the first transistor, the fourth transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in a turn-off state during the third stage. In the fourth stage of the charging cycle, the control electrodes of the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor are all used to receive a fifth turn-on control signal. This fifth turn-on control signal controls the third transistor, the sixth transistor, the twelfth transistor, and the second transistor to be in a turn-on state during the fourth stage. The control electrodes of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a fifth turn-off control signal. This fifth turn-off control signal controls the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in a turn-off state during the fourth stage. The on / off control signals include the first off control signal, the second off control signal, the third off control signal, the fourth off control signal, the fifth off control signal, the second on control signal, the third on control signal, the fourth on control signal, and the fifth on control signal.

15. The switching converter circuit according to claim 7, characterized in that, When the second terminal of the twelfth transistor is grounded, and the switching converter circuit operates in the second charging mode, the third voltage conversion circuit operates in the two-voltage stabilization mode. In any charging cycle: The control electrode of the eighth transistor, the control electrode of the ninth transistor, and the control electrode of the tenth transistor are all used to receive the sixth turn-off control signal. The sixth turn-off control signal is used to control the eighth transistor, the ninth transistor, and the tenth transistor to be in the off state during the charging cycle. In the first stage of the charging cycle, the control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a seventh turn-on control signal. The seventh turn-on control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in the turn-on state during the first stage. The control terminals of the second transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive a seventh turn-off control signal. The seventh turn-off control signal is used to control the second transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in the turn-off state during the first stage. In the second stage of the charging cycle, the control terminals of the second transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive an eighth turn-on control signal. The eighth turn-on control signal is used to control the second transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in the turn-on state during the second stage. The control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive an eighth turn-off control signal. The eighth turn-off control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in the turn-off state during the second stage. The on / off control signals include the sixth off control signal, the seventh off control signal, the eighth off control signal, the seventh on control signal, and the eighth on control signal.

16. The switching converter circuit according to claim 7, characterized in that, When the second terminal of the twelfth transistor is connected to the second terminal of the third capacitor, the second terminal of the ninth transistor, and the first terminal of the tenth transistor, respectively, when the switching converter circuit operates in the first discharge mode, the third voltage conversion circuit operates in the three-voltage stabilization mode. In any discharge cycle: The control electrode of the eighth transistor and the control electrode of the ninth transistor are both used to receive the ninth turn-off control signal. The ninth turn-off control signal is used to control the eighth transistor and the ninth transistor to be in the off state during the charging cycle. In the first stage of the discharge cycle, the control electrodes of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the twelfth transistor are all used to receive a tenth turn-on control signal. The tenth turn-on control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the twelfth transistor to be in the turn-on state in the first stage. The control electrodes of the third transistor, the sixth transistor, the eleventh transistor, the second transistor, and the tenth transistor are all used to receive a tenth turn-off control signal. The tenth turn-off control signal is used to control the third transistor, the sixth transistor, the eleventh transistor, the second transistor, and the tenth transistor to be in the turn-off state in the first stage. In the second stage of the discharge cycle, the control terminals of the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor are all used to receive an eleventh turn-on control signal. This eleventh turn-on control signal controls the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor to be in a turn-on state during the second stage. The control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive an eleventh turn-off control signal. This eleventh turn-off control signal controls the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in a turn-off state during the second stage. In the third stage of the discharge cycle, the control terminals of the fifth transistor, the seventh transistor, the eleventh transistor, the second transistor, and the tenth transistor are all used to receive a twelfth turn-on control signal. This twelfth turn-on control signal controls the fifth transistor, the seventh transistor, the eleventh transistor, the second transistor, and the tenth transistor to be in a turn-on state during the third stage. The control terminals of the first transistor, the fourth transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive a twelfth turn-off control signal. This twelfth turn-off control signal controls the first transistor, the fourth transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in a turn-off state during the third stage. In the fourth stage of the discharge cycle, the control terminals of the third transistor, the sixth transistor, the twelfth transistor, the second transistor, and the tenth transistor are all used to receive a thirteenth turn-on control signal. This thirteenth turn-on control signal controls the third transistor, the sixth transistor, the twelfth transistor, and the second transistor to be in a turn-on state during the fourth stage. The control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a thirteenth turn-off control signal. This thirteenth turn-off control signal controls the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in a turn-off state during the fourth stage. The on / off control signals include the ninth off control signal, the tenth off control signal, the eleventh off control signal, the twelfth off control signal, the tenth on control signal, the eleventh on control signal, the twelfth on control signal, and the thirteenth on control signal.

17. The switching converter circuit according to claim 7, characterized in that, When the second terminal of the twelfth transistor is grounded, and the switching converter circuit operates in the second discharge mode, the third voltage conversion circuit operates in the two-voltage stabilization mode. Within any discharge cycle: The control electrode of the eighth transistor, the control electrode of the ninth transistor, and the control electrode of the tenth transistor are all used to receive the fourteenth shutdown control signal. The fourteenth shutdown control signal is used to control the eighth transistor, the ninth transistor, and the tenth transistor to be in the shutdown state during the charging cycle. In the first stage of the discharge cycle, the control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a fifteenth turn-on control signal. The fifteenth turn-on control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in the turn-on state during the first stage. The control terminals of the second transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive a fifteenth turn-off control signal. The fifteenth turn-off control signal is used to control the second transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in the turn-off state during the first stage. In the second stage of the charging cycle, the control terminals of the second transistor, the third transistor, the sixth transistor, and the twelfth transistor are all used to receive a sixteenth turn-on control signal. The sixteenth turn-on control signal is used to control the second transistor, the third transistor, the sixth transistor, and the twelfth transistor to be in the turn-on state during the second stage. The control terminals of the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor are all used to receive a sixteenth turn-off control signal. The sixteenth turn-off control signal is used to control the first transistor, the fourth transistor, the fifth transistor, the seventh transistor, and the eleventh transistor to be in the turn-off state during the second stage. The on / off control signals include the fourteenth off control signal, the fifteenth off control signal, the sixteenth off control signal, the fifteenth on control signal, and the sixteenth on control signal.

18. The switching converter circuit according to claim 8, characterized in that, When the second terminal of the twelfth transistor is grounded, and the switching converter circuit operates in the third charging mode, the third voltage conversion circuit operates in the two-voltage stabilization mode. In any charging cycle: The control electrode of the first transistor is used to receive the seventeenth conduction control signal, which controls the first transistor to be in the conduction state throughout the charging cycle; the control electrodes of the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, and the ninth transistor are all used to receive the seventeenth turn-off control signal, which controls the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, and the ninth transistor to be in the turn-off state throughout the charging cycle; In the first stage of the charging cycle, the control terminals of the eleventh transistor and the fourteenth transistor are both used to receive the eighteenth turn-on control signal, which controls the eleventh transistor and the fourteenth transistor to switch to the turn-on state in the first stage; the control terminals of the tenth transistor and the twelfth transistor are both used to receive the eighteenth turn-off control signal, which controls the tenth transistor and the twelfth transistor to switch to the turn-off state in the first stage. In the second stage of the charging cycle, the control terminals of the twelfth transistor and the fourteenth transistor are both used to receive the nineteenth turn-on control signal, which controls the twelfth transistor and the fourteenth transistor to switch to the turn-on state in the second stage; the control terminals of the tenth transistor and the eleventh transistor are both used to receive the nineteenth turn-off control signal, which controls the tenth transistor and the eleventh transistor to switch to the turn-off state in the second stage. In the third stage of the charging cycle, the control terminals of the eleventh transistor and the fourteenth transistor are both used to receive the twentieth turn-on control signal, which controls the eleventh transistor and the fourteenth transistor to switch to the turn-on state in the third stage; the control terminals of the tenth transistor and the twelfth transistor are both used to receive the twentieth turn-off control signal, which controls the tenth transistor and the twelfth transistor to switch to the turn-off state in the third stage. In the fourth stage of the charging cycle, the control terminals of the tenth transistor and the eleventh transistor are both used to receive the twenty-first turn-on control signal, which controls the tenth transistor and the eleventh transistor to switch to the turn-on state in the fourth stage; the control terminals of the twelfth transistor and the fourteenth transistor are both used to receive the twenty-first turn-off control signal, which controls the twelfth transistor and the fourteenth transistor to switch to the turn-off state in the fourth stage. The on / off control signals include the seventeenth on control signal, the eighteenth on control signal, the nineteenth on control signal, the twentieth on control signal, the twenty-first on control signal, the seventeenth off control signal, the eighteenth off control signal, the nineteenth off control signal, the twentieth off control signal, and the twenty-first off control signal.

19. The switching converter circuit according to claim 8, characterized in that, When the second terminal of the twelfth transistor is grounded, and the switching converter circuit operates in the third discharge mode, the third voltage conversion circuit operates in the two-voltage stabilization mode. Within any discharge cycle: The control electrode of the first transistor is used to receive a twenty-second conduction control signal, which controls the first transistor to be in the conduction state throughout the charging cycle. The control electrodes of the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, and the ninth transistor are all used to receive a twenty-second turn-off control signal, which controls the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, and the ninth transistor to be in the turn-off state throughout the charging cycle. In the first stage of the charging cycle, the control terminals of the eleventh transistor and the fourteenth transistor are both used to receive the twenty-third turn-on control signal. The twenty-third turn-on control signal is used to control the eleventh transistor and the fourteenth transistor to switch to the turn-on state in the first stage. The control terminals of the tenth transistor and the twelfth transistor are both used to receive the twenty-third turn-off control signal. The twenty-third turn-off control signal is used to control the tenth transistor and the twelfth transistor to switch to the turn-off state in the first stage. In the second stage of the charging cycle, the control terminals of the twelfth transistor and the fourteenth transistor are both used to receive the twenty-fourth turn-on control signal, which controls the twelfth transistor and the fourteenth transistor to switch to the turn-on state in the second stage; the control terminals of the tenth transistor and the eleventh transistor are both used to receive the twenty-fourth turn-off control signal, which controls the tenth transistor and the eleventh transistor to switch to the turn-off state in the second stage. In the third stage of the charging cycle, the control terminals of the eleventh transistor and the fourteenth transistor are both used to receive the twenty-fifth turn-on control signal. The twenty-fifth turn-on control signal is used to control the eleventh transistor and the fourteenth transistor to switch to the turn-on state in the third stage. The control terminals of the tenth transistor and the twelfth transistor are both used to receive the twenty-fifth turn-off control signal. The twenty-fifth turn-off control signal is used to control the tenth transistor and the twelfth transistor to switch to the turn-off state in the third stage. In the fourth stage of the charging cycle, the control terminals of the tenth and eleventh transistors are both used to receive the twenty-sixth turn-on control signal, which controls the tenth and eleventh transistors to switch to the turn-on state in the fourth stage; the control terminals of the twelfth and fourteenth transistors are both used to receive the twenty-sixth turn-off control signal, which controls the twelfth and fourteenth transistors to switch to the turn-off state in the fourth stage. The on / off control signals include the 22nd on control signal, the 23rd on control signal, the 24th on control signal, the 25th on control signal, the 26th on control signal, the 22nd off control signal, the 23rd off control signal, the 24th off control signal, the 25th off control signal, and the 26th off control signal.

20. The switching converter circuit according to claim 13, characterized in that, The switching converter circuit further includes a control circuit, the output terminal of which is connected to the control terminals of the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, and the twelfth transistor, respectively. The control circuit is used to output corresponding on / off control signals to the control electrodes of the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, the ninth transistor, the tenth transistor, the eleventh transistor, and the twelfth transistor, respectively, so as to control the switching converter circuit to operate in different charging or discharging modes.

21. A chip, characterized in that, The chip includes a switching converter circuit as described in any one of claims 1-20.

22. A battery system, characterized in that, The battery system includes a switching converter circuit as described in any one of claims 1-20.

23. An electronic device, characterized in that, The electronic device includes a switching converter circuit as described in any one of claims 1-20; or the electronic device includes a chip as described in claim 20.

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