Drive circuits, cascaded switched capacitor voltage converters, chips and electronic devices

Abstract

This application provides a driving circuit, a cascaded switched-capacitor voltage converter, a chip, and an electronic device, relating to the field of electronic circuit technology. The driving circuit includes a target driving circuit and a target power supply circuit corresponding to each circuit unit of the cascaded switched-capacitor voltage converter. The target power supply circuit is used to obtain electrical energy from a second target capacitor according to the equipotential compensation principle and replenish the first, second, and third power supply terminals of the target power supply circuit. The target driving circuit is used to control the cascaded switched-capacitor voltage converter to alternately execute two phase stages according to a received driving control signal, based on the supply voltage of the first, second, and third power supply terminals of the target power supply circuit, the supply voltage obtained from the first, second, and third target capacitors according to the equipotential compensation principle, and the output voltage obtained from the first voltage output terminal and / or the second voltage output terminal. This reduces additional damage during the driving process and improves the conversion efficiency of the converter.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a drive circuit, a cascaded switched capacitor voltage converter, a chip, and an electronic device. Background Technology

[0002] A switched-capacitor voltage converter, also known as a charge pump, is a special type of DC-DC converter. A DC-DC converter uses capacitors as the energy transfer medium and controls switches to change the capacitor connection to achieve voltage boosting, bucking, or polarity reversal.

[0003] For complex voltage conversion requirements, multi-stage circuit architectures can be used to construct the corresponding switched-capacitor converters. For example, Figure 1 This diagram illustrates a cascaded switched capacitor voltage conversion circuit provided in the related art, with reference to... Figure 1 As shown, this cascaded switched capacitor voltage conversion circuit controls the connection relationship of each capacitor in the circuit by controlling the different logic states of the power switching transistors Q1A~Q10A and Q1B~Q10B being turned on or off. This allows the charge to be transferred from the voltage input terminal VIN to the voltage output terminal VOUT, realizing voltage conversion between input and output at different ratios, as well as corresponding reverse current conversion at a fixed ratio.

[0004] Cascaded switched-capacitor voltage converters (CSVCs) can be applied to various mobile charging devices. For CSVCs, conversion efficiency is a crucial indicator. High efficiency means more input energy can be effectively transferred to the load, and less temperature rise occurs under the same load conditions. This translates to stronger load-carrying capacity and faster charging speed under the same temperature rise requirements. The drive losses of each power switch in the circuit are a significant factor affecting the circuit's conversion efficiency, and these drive losses are closely related to their respective power supply drive networks. Therefore, designing the power supply drive network to reduce the drive losses of the power switches is of great importance for improving the conversion efficiency of CSVCs and is a pressing technical problem that needs to be solved. Summary of the Invention

[0005] This application provides a driving circuit, a cascaded switched capacitor voltage converter, a chip, and an electronic device to reduce the driving loss of the power switching transistor in the cascaded switched capacitor voltage converter and improve the conversion efficiency of the cascaded switched capacitor voltage converter.

[0006] In a first aspect, this application provides a driving circuit applied to a cascaded switched capacitor voltage conversion circuit, the cascaded switched capacitor voltage conversion circuit including a first circuit unit and a second circuit unit; the input terminal of the first circuit unit and the input terminal of the second circuit unit are connected to serve as the voltage input terminal of the cascaded switched capacitor voltage conversion circuit, the first output terminal of the first circuit unit and the second output terminal of the second circuit unit are connected to serve as the first voltage output terminal of the cascaded switched capacitor voltage conversion circuit, and the second output terminal of the first circuit unit and the first output terminal of the second circuit unit are connected to serve as the second voltage output terminal of the cascaded switched capacitor voltage conversion circuit; wherein, each circuit unit includes a first target capacitor, a second target capacitor, a third target capacitor and a target switch group, the target switch group of the first circuit unit and the second circuit unit is used to control the connection relationship of the first target capacitor, the second target capacitor and the third target capacitor according to the voltage conversion ratio, forming two alternating phase stages, so that the cascaded switched capacitor voltage conversion circuit converts the input voltage of the voltage input terminal according to the voltage conversion ratio through the alternating operation of the two phase stages; The driving circuit includes a target driving circuit and a target power supply circuit corresponding to each circuit unit. The power-taking terminal of the target power supply circuit is connected to the positive plate of the second target capacitor. The first power supply terminal of the target power supply circuit is connected to the first power-taking terminal of the target driving circuit. The second power supply terminal of the target power supply circuit is connected to the second power-taking terminal of the target driving circuit. The third power supply terminal of the target power supply circuit is connected to the third power-taking terminal of the target driving circuit. The fourth power supply terminal of the target driving circuit is connected to the power-taking terminal of the target power supply circuit. The fifth power supply terminal of the target driving circuit is connected to the positive plate of the first target capacitor. The sixth power supply terminal of the target driving circuit is connected to the positive plate of the third target capacitor. The seventh power supply terminal of the target driving circuit is connected to the first voltage output terminal and / or the second voltage output terminal. The eighth power supply terminal of the target driving circuit is connected to the third power supply terminal of the target power supply circuit corresponding to another circuit unit. The control terminal of the target driving circuit is connected to the controlled terminal of the corresponding target switch group. The target power supply circuit is used to obtain electrical energy from the second target capacitor and replenish the electrical energy to the first power supply terminal, the second power supply terminal and the third power supply terminal of the target power supply circuit according to the principle of equipotential power replenishment and the phase stage of the alternating operation of the cascaded switched capacitor voltage conversion circuit. The target driving circuit is used to control the cascaded switched capacitor voltage conversion circuit to alternately execute the two phase stages based on the power supply voltage of the first power supply terminal, the second power supply terminal and the third power supply terminal of the target power supply circuit, the power supply voltage obtained from the first target capacitor, the second target capacitor and the third target capacitor according to the equipotential compensation principle, and the output voltage obtained from the first voltage output terminal and / or the second voltage output terminal, according to the received driving control signal.

[0007] In an optional design, the target power supply circuit is specifically used to: obtain electrical energy from the second target capacitor and supplement the electrical energy to the third power supply terminal of the target power supply circuit when the corresponding circuit unit is working in the first target phase stage, according to the principle of equipotential compensation; When the corresponding circuit unit is operating in the second target phase stage, power is supplied from the third power supply terminal to the second power supply terminal. When the corresponding circuit unit switches from the second target phase stage to the first target phase stage, power is supplied from the second power supply terminal to the first power supply terminal.

[0008] In one alternative design, the target power supply circuit includes a first target bootstrap capacitor, a second target bootstrap capacitor, a third target bootstrap capacitor, a first target switch, a second target switch, a third target switch, and a fourth target switch. The positive plate of the first target bootstrap capacitor is connected to the first terminal of the third target switch transistor to serve as the first power supply terminal of the target power supply circuit. The negative plate of the first target bootstrap capacitor serves as the first connection terminal of the target power supply circuit and is connected to the positive plate of the first target capacitor. The positive plate of the second target bootstrap capacitor is connected to the second terminal of the third target switch transistor and the first terminal of the second target switch transistor to serve as the second power supply terminal of the target power supply circuit. The negative plate of the second target bootstrap capacitor is connected to the first terminal of the fourth target switch transistor to serve as the power take-off terminal of the target power supply circuit. The second terminal of the fourth target switch transistor is connected to the second terminal of the first target switch transistor. The first terminal of the first target switch transistor, the second terminal of the second target switch transistor, and the positive plate of the third target bootstrap capacitor serve as the third power supply terminal of the target power supply circuit. The negative plate of the third target bootstrap capacitor corresponding to the first circuit unit serves as the second connection terminal of the target power supply circuit and is connected to the first voltage output terminal. The negative plate of the third target bootstrap capacitor corresponding to the second circuit unit serves as the second connection terminal of the target power supply circuit and is connected to the second voltage output terminal. When the voltage conversion ratio is 4:1 or 3:1, the first target switch and the third target switch are turned on when the corresponding circuit unit is operating in the first target phase stage, and turned off when the corresponding circuit unit is operating in the second target phase stage; the second target switch is turned off when the corresponding circuit unit is operating in the first target phase stage, and turned on when the corresponding circuit unit is operating in the second target phase stage; the fourth target switch remains on in both target phase stages. When the voltage conversion ratio is 2:1, the first target switch is turned on when the corresponding circuit unit is operating in the first target phase stage, and turned off when the corresponding circuit unit is operating in the second target phase stage; the second target switch and the third target switch are simultaneously turned off when the corresponding circuit unit is operating in the first target phase stage, and simultaneously turned on when the corresponding circuit unit is operating in the second target phase stage. When the first target switch is turned on, the third target bootstrap capacitor obtains electrical energy from the second target capacitor and replenishes the obtained electrical energy to the third power supply terminal; when the second target switch is turned on, the second target bootstrap capacitor obtains electrical energy from the third power supply terminal and replenishes the obtained electrical energy to the second power supply terminal; when the third target switch is turned on, the first target bootstrap capacitor obtains electrical energy from the second power supply terminal and replenishes the obtained electrical energy to the first power supply terminal.

[0009] In one optional design, the target switch group corresponding to each circuit unit includes a first target switch group, a second target switch group, and a third target switch group; the first terminal of the first target switch group serves as the input terminal of the circuit unit, the second terminal of the first target switch group is connected to the positive plate of the first target capacitor, the third terminal of the first target switch group is connected to the positive plate of the second target capacitor, and the fourth terminal of the first target switch group is connected to the negative plate of the second target capacitor; the first terminal of the second target switch group is connected to the negative plate of the first target capacitor, the second terminal of the second target switch group is connected to the first terminal of the third target switch group and the positive plate of the third target capacitor, and the second terminal of the third target switch group is connected to the negative plate of the third target capacitor; the output terminal of the first target switch group of the first circuit unit serves as the first output terminal of the first circuit unit, and the output terminal of the third target switch group of the first circuit unit serves as the second output terminal of the first circuit unit; the output terminal of the third target switch group of the second circuit unit serves as the first output terminal of the second circuit unit, and the output terminal of the first target switch group of the second circuit unit serves as the second output terminal of the second circuit unit; The target driving circuit includes a first target sub-driving circuit corresponding to the first target switch group, a second target sub-driving circuit corresponding to the second target switch group, and a third target sub-driving circuit corresponding to the third target switch group. The control terminal of the first target sub-driving circuit is connected to the controlled terminal of the first target switch group. The first power-taking terminal of the first target sub-driving circuit is connected to the first power-supply terminal of the target power supply circuit. The second power-taking terminal of the first target sub-driving circuit is connected to the second power-supply terminal of the target power supply circuit. The third power-taking terminal of the first target sub-driving circuit is connected to the third power-supply terminal of the target power supply circuit. The fourth power-taking terminal of the first target sub-driving circuit is connected to the power-supply terminal of the target power supply circuit. The control terminal of the second target sub-driving circuit is connected to the second target switch group. The controlled terminal of the target switch group is connected. The first power-taking terminal of the second target sub-drive circuit serves as the fifth power-taking terminal of the target drive circuit and is used to connect with the positive plate of the first target capacitor. The second power-taking terminal of the second target sub-drive circuit, after being connected with the fifth power-taking terminal of the first target sub-drive circuit, serves as the first sub-terminal of the seventh power-taking terminal of the target drive circuit and is used to connect with the first voltage output terminal. The control terminal of the third target sub-drive circuit is used to connect with the controlled terminal of the third target switch group. The first power-taking terminal of the third target sub-drive circuit serves as the eighth power-taking terminal of the target drive circuit and is connected with the third power-supply terminal of the target power supply circuit corresponding to another circuit unit. The second power-taking terminal of the third target sub-drive circuit serves as the sixth power-taking terminal of the target drive circuit and is used to connect with the positive plate of the third target capacitor. The third power-taking terminal of the third target sub-drive circuit serves as the second sub-terminal of the seventh power-taking terminal of the target drive circuit and is used to connect with the second voltage output terminal. The first target sub-driving circuit is used to control the switching state of the first target switch group according to the driving control signal based on the supply voltage obtained from the second target capacitor, the first output voltage obtained from the first voltage output terminal, and the supply voltage provided by the first power supply terminal, the second power supply terminal and the third power supply terminal of the target power supply circuit; The second target sub-driving circuit is used to control the switching state of the second target switch group according to the driving control signal based on the supply voltage obtained from the first target capacitor and the first output voltage obtained from the first voltage output terminal; The third target sub-driving circuit is used to control the switching state of the third target switch group according to the driving control signal based on the power supply voltage obtained from the third power supply terminal of the target power supply circuit corresponding to another circuit unit, the power supply voltage obtained from the third target capacitor, and the second output voltage obtained from the second voltage output terminal.

[0010] In an optional design, the first target switch group includes a first target power switch, a third target power switch, a fifth target power switch, a sixth target power switch, and a seventh target power switch. The second end of the first target power switch serves as the first end of the first target switch group. The first end of the first target power switch is connected to the second end of the third target power switch and then serves as the second end of the first target switch group, connected to the positive plate of the first target capacitor. The first end of the third target power switch is connected to the second end of the fifth target power switch and then serves as the third end of the first target switch group, connected to the positive plate of the second target capacitor. The first end of the fifth target power switch is connected to the second end of the sixth target power switch and then serves as the output end of the first target switch group. The first end of the sixth target power switch and the second end of the seventh target power switch are connected as the fourth end of the first target switch group, connected to the negative plate of the second target capacitor. The first end of the seventh target power switch is connected to ground. The first target sub-driving circuit includes a first target power switch driving circuit corresponding to the first target power switch, a third target power switch driving circuit corresponding to the third target power switch, a fifth target power switch driving circuit corresponding to the fifth target power switch, a sixth target power switch driving circuit corresponding to the sixth target power switch, and a seventh target power switch driving circuit corresponding to the seventh target power switch. The driving terminal of the first target power switch driving circuit serves as the first control terminal of the first target sub-driving circuit for connection to the controlled terminal of the first target power switch. A power-taking terminal is connected to the first power-taking terminal of the first target sub-driving circuit and the first power-supply terminal of the target power supply circuit. A second power-taking terminal of the first target power switch driving circuit is connected to the first connection terminal of the target power supply circuit. The driving terminal of the third target power switch driving circuit serves as the second control terminal of the first target sub-driving circuit and is connected to the controlled terminal of the third target power switch. The first power-taking terminal of the third target power switch driving circuit serves as the second power-taking terminal of the first target sub-driving circuit and is connected to the second power-supply terminal of the target power supply circuit. The power supply terminals are connected as follows: the driving terminal of the fifth target power switch driving circuit serves as the third control terminal of the first target sub-driving circuit and is connected to the controlled terminal of the fifth target power switch; the first power supply terminal of the fifth target power switch driving circuit serves as the third power supply terminal of the first target sub-driving circuit and is connected to the third power supply terminal of the target power supply circuit; the second power supply terminal of the fifth target power switch driving circuit is connected to the output terminal of the first target switch group; the driving terminal of the sixth target power switch driving circuit serves as the fourth control terminal of the first target sub-driving circuit and is connected to the controlled terminal of the sixth target power switch. The first power-taking terminal of the power switch driving circuit is connected to the power-taking terminal of the target power supply circuit as the fourth power-taking terminal of the first target sub-driving circuit. The second power-taking terminal of the sixth target power switch driving circuit is used to connect to the negative plate of the second target capacitor. The driving terminal of the seventh target power switch driving circuit is connected to the controlled terminal of the seventh target power switch as the fifth control terminal of the first target sub-driving circuit. The first power-taking terminal of the seventh target power switch driving circuit is connected to the first voltage output terminal as the fifth power-taking terminal of the first target sub-driving circuit. The second power-taking terminal of the seventh target power switch driving circuit is connected to ground.

[0011] In one optional design, when the cascaded switched capacitor voltage conversion circuit operates in a 2:1 voltage conversion ratio mode and the first target sub-driving circuit controls the third target power switch to remain on in both phase phases, the first output voltage output from the first voltage output terminal and the second output voltage output from the second voltage output terminal are equal; when the cascaded switched capacitor voltage conversion circuit operates in a 2:1 voltage conversion ratio mode and the first target sub-driving circuit controls the third target power switch to alternately conduct in the two phase phases, the first output voltage output from the first voltage output terminal and the second output voltage output from the second voltage output terminal are not equal.

[0012] In one optional design, the second target switch group includes a second target power switch and a fourth target power switch; the first end of the second target power switch is connected to ground, the second end of the second target power switch is connected to the first end of the fourth target power switch and serves as the first end of the second target switch group, which is connected to the negative plate of the first target capacitor, and the second end of the fourth target power switch serves as the second end of the second target switch group, which is connected to the positive plate of the third target capacitor; The second target sub-driving circuit includes a second target power switch driving circuit corresponding to the second target power switch and a fourth target power switch driving circuit corresponding to the fourth target power switch. The driving terminal of the second target power switch driving circuit serves as the first control terminal of the second target sub-driving circuit and is connected to the controlled terminal of the second target power switch. The first power-taking terminal of the second target power switch driving circuit serves as the second power-taking terminal of the second target sub-driving circuit and is connected to the first voltage output terminal. The second power-taking terminal of the second target power switch driving circuit is connected to ground. The driving terminal of the fourth target power switch driving circuit serves as the second control terminal of the second target sub-driving circuit and is connected to the controlled terminal of the fourth target power switch. The first power-taking terminal of the fourth target power switch driving circuit serves as the first power-taking terminal of the second target sub-driving circuit and is connected to the positive plate of the first target capacitor. The second power-taking terminal of the fourth target power switch driving circuit is connected to the negative plate of the first target capacitor.

[0013] In an optional design, the driving circuit further includes a boost circuit, the input terminal of which is connected to the voltage input terminal of the cascaded switched capacitor voltage conversion circuit, and the output terminal of which is used to output the boosted power supply voltage. The fourth target power switch driving circuit includes a fourth target driving unit, a target driving control switch, a target Zener diode, and a fourth target capacitor. The drain of the target driving control switch serves as the first power-taking terminal of the fourth target power switch driving circuit and is connected to the positive plate of the first target capacitor. The gate of the target driving control switch is connected to the negative terminal of the target Zener diode and the positive plate of the fourth target capacitor, and then serves as the third power-taking terminal of the fourth target power switch driving circuit and is connected to the output terminal of the boost circuit. The source of the target driving control switch is connected to the first power-taking terminal of the fourth target driving unit. The second power-taking terminal of the fourth target driving unit, the positive terminal of the target Zener diode, and the negative plate of the fourth target capacitor are connected to serve as the second power-taking terminal of the fourth target power switch driving circuit and are connected to the negative plate of the first target capacitor.

[0014] In an optional design, the third target switch group includes an eighth target power switch, a ninth target power switch, and a tenth target power switch; the second end of the eighth target power switch serves as the first end of the third target switch group and is connected to the positive plate of the third target capacitor; the first end of the eighth target power switch is connected to the second end of the ninth target power switch and serves as the output end of the third target switch group; the first end of the ninth target power switch is connected to the second end of the tenth target power switch and serves as the second end of the third target switch group and is connected to the negative plate of the third target capacitor; and the first end of the tenth target power switch is connected to ground. The third target sub-driving circuit includes an eighth target power switch driving circuit corresponding to the eighth target power switch, a ninth target power switch driving circuit corresponding to the ninth target power switch, and a tenth target power switch driving circuit corresponding to the tenth target power switch. The driving terminal of the eighth target power switch driving circuit serves as the first control terminal of the third target sub-driving circuit and is connected to the controlled terminal of the eighth target power switch. The first power-taking terminal of the eighth target power switch driving circuit serves as the first power-taking terminal of the third target sub-driving circuit and is connected to the third power-supply terminal of the target power supply circuit corresponding to another circuit unit. The second power-taking terminal of the eighth target power switch driving circuit is connected to the output terminal of the third target switch group. The driving terminal of the ninth target power switch driving circuit... The driving terminal of the tenth target power switch circuit serves as the second control terminal of the third target sub-driving circuit and is connected to the controlled terminal of the ninth target power switch. The first power-taking terminal of the ninth target power switch circuit serves as the second power-taking terminal of the third target sub-driving circuit and is connected to the positive plate of the third target capacitor. The second power-taking terminal of the ninth target power switch circuit is also connected to the negative plate of the third target capacitor. The driving terminal of the tenth target power switch circuit serves as the third control terminal of the third target sub-driving circuit and is connected to the controlled terminal of the tenth target power switch. The first power-taking terminal of the tenth target power switch circuit serves as the third power-taking terminal of the third target sub-driving circuit and is connected to the second voltage output terminal. The second power-taking terminal of the tenth target power switch circuit is connected to ground.

[0015] In an alternative design, when the cascaded switched capacitor voltage conversion circuit operates in a working mode with a voltage conversion ratio of 2:1 or 3:1, the third target sub-drive circuit controls the ninth target power switch to remain off in both phase phases, and controls the eighth and tenth target power switches to remain on in both phase phases.

[0016] In one optional design, when the cascaded switched capacitor voltage conversion circuit operates in a 4:1 voltage conversion ratio mode, the first output voltage output by the first voltage output terminal and the second output voltage output by the second voltage output terminal are equal or unequal; when the cascaded switched capacitor voltage conversion circuit operates in a 3:1 voltage conversion ratio mode, the first output voltage output by the first voltage output terminal and the second output voltage output by the second voltage output terminal are equal.

[0017] In a second aspect, this application provides a cascaded switched capacitor voltage converter, including a cascaded switched capacitor voltage conversion circuit and a driving circuit as described in any of the first aspects above. The cascaded switched capacitor voltage conversion circuit includes a first circuit unit and a second circuit unit. The input terminals of the first and second circuit units are connected to serve as the voltage input terminal of the cascaded switched capacitor voltage conversion circuit. The first output terminal of the first circuit unit is connected to the first output terminal of the second circuit unit to serve as the first voltage output terminal of the cascaded switched capacitor voltage conversion circuit. The second output terminal of the first circuit unit is connected to the second output terminal of the second circuit unit to serve as the second voltage output terminal of the cascaded switched capacitor voltage conversion circuit. Each circuit unit includes a first target capacitor, a second target capacitor, a third target capacitor, and a target switch group. The target switch group of the first and second circuit units is used to control the connection relationship of the first, second, and third target capacitors according to the voltage conversion ratio, forming two alternating phase stages. This allows the cascaded switched capacitor voltage conversion circuit to convert the input voltage at the voltage input terminal according to the voltage conversion ratio through the alternating operation of the two phase stages.

[0018] Thirdly, this application provides a chip including a driving circuit as described in any of the first aspects above, or including a cascaded switched capacitor voltage converter as described in the second aspect above.

[0019] Fourthly, this application provides an electronic device, including a cascaded switched capacitor voltage converter as described in the second aspect above, or including a chip as described in the third aspect above.

[0020] The driving circuit, cascaded switched capacitor voltage converter, chip, and electronic device provided in this application include a target driving circuit and a target power supply circuit corresponding to each circuit unit of the cascaded switched capacitor voltage converter circuit. The target power supply circuit obtains electrical energy from the second target capacitor according to the principle of equipotential compensation and the alternating phase stages of the cascaded switched capacitor voltage converter circuit, and replenishes the electrical energy to the first, second, and third power supply terminals of the target power supply circuit. The target driving circuit, based on the supply voltages of the first, second, and third power supply terminals of the target power supply circuit, the supply voltages obtained from the first, second, and third target capacitors according to the principle of equipotential compensation, and the output voltages obtained from the first and / or second voltage output terminals, controls the cascaded switched capacitor voltage converter circuit to alternately execute two phase stages according to the received driving control signal, thereby realizing the power supply driving function. In this way, according to the power supply requirements of the target driving circuit, power can be directly drawn from the output terminal of the cascaded switched capacitor voltage converter circuit and each capacitor through the principle of equipotential power supplementation to provide equipotential power supply to the target driving circuit. There is no voltage drop during the power supply process, which greatly reduces the additional losses in the driving process and improves the conversion efficiency of the cascaded switched capacitor voltage converter. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a cascaded switched capacitor voltage conversion circuit provided in related technologies; Figure 2 A schematic diagram of the structure of each circuit unit of the cascaded switched capacitor voltage conversion circuit provided in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the cascaded switched capacitor voltage conversion circuit provided in the embodiments of this application; Figure 4 This is a schematic diagram of the drive circuit provided in an embodiment of this application; Figure 5 This is a schematic diagram of the target power supply circuit provided in an embodiment of this application; Figure 6 This is a schematic diagram of the target driving circuit provided in an embodiment of this application; Figure 7 This is a schematic diagram of a cascaded switched capacitor voltage converter provided in an embodiment of this application. Detailed Implementation

[0022] 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. 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. a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance.

[0023] 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.

[0024] 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.

[0025] Reference Figure 1The cascaded switched capacitor voltage conversion circuit shown may include a voltage input terminal VIN, a voltage output terminal VOUT, and a first unit 11 and a second unit 12 arranged symmetrically. The first unit 11 includes a first power switch Q1A, a third power switch Q2A, a fifth power switch Q3A, a seventh power switch Q4A, a ninth power switch Q5A, an eleventh power switch Q6A, a thirteenth power switch Q7A, a fifteenth power switch Q8A, a seventeenth power switch Q9A, a nineteenth power switch Q10A, a first capacitor CF1A, a third capacitor CF2A, and a fifth capacitor CF3A. The second terminal of the first power switch Q1A serves as the input terminal of the first unit 11 and is connected to the voltage input terminal VIN. The first power switch Q1A, the fifth power switch Q3A, the ninth power switch Q5A, the seventeenth power switch Q9A, and the nineteenth power switch Q10A are connected in series and then connected to ground PGND. The third capacitor CF2A is connected between the series connection node of the fifth power switch Q3A and the ninth power switch Q5A, and the series connection node of the eleventh power switch Q6A and the thirteenth power switch Q7A. The first terminal of the seventh power switch Q4A is connected in series with the third power switch Q2A and then grounded to PGND. The second terminal of the seventh power switch Q4A is connected to the fifteenth power switch Q8A... The second terminal is connected as follows: the first terminal of the fifteenth power switch Q8A is connected in series with the seventeenth power switch Q9A and the nineteenth power switch Q10A, and then connected to ground PGND; the first capacitor CF1A is connected between the series connection node of the first power switch Q1A and the fifth power switch Q3A and the first terminal of the seventh power switch Q4A; the fifth capacitor CF3A is connected between the second terminal of the fifteenth power switch Q8A and the second terminal of the nineteenth power switch Q10A; the connection node of the fifteenth power switch Q8A and the seventeenth power switch Q9A is connected to the voltage output terminal VOUT; the connection node of the ninth power switch Q5A and the eleventh power switch Q6A is connected to the voltage output terminal VOUT.

[0026] The second unit 12 includes a second power switch Q1B, a fourth power switch Q2B, a sixth power switch Q3B, an eighth power switch Q4B, a tenth power switch Q5B, a twelfth power switch Q6B, a fourteenth power switch Q7B, a sixteenth power switch Q8B, an eighteenth power switch Q9B, a twentieth power switch Q10B, a second capacitor CF1B, a fourth capacitor CF2B, and a sixth capacitor CF3B. The circuit structure of the second unit 12 is the same as that of the first unit 11.

[0027] Each power switch can be an N-type metal-oxide-semiconductor field-effect transistor (MOS) or a P-type MOS transistor. When each power switch is an N-type MOS transistor, the first terminal of the power switch is the source and the second terminal is the drain; when each power switch is a P-type MOS transistor, the first terminal of the power switch is the drain and the second terminal is the source.

[0028] according to Figure 1 The cascaded switched-capacitor voltage converter circuit shown controls the connection relationship of the capacitors in the circuit by controlling the different logic states of the on or off of each power switch. This allows charge to be transferred from the voltage input terminal VIN to the voltage output terminal VOUT, achieving voltage conversion with different ratios between input and output, as well as corresponding reverse fixed-ratio current conversion. For example, it can achieve voltage and current conversion ratios of 4:1, 3:1, or 2:1, as well as corresponding reverse fixed-ratio voltage and current conversions.

[0029] For cascaded switched capacitor voltage converter circuits, the losses during the conversion process mainly come from: 1) The conduction loss of the power switching transistor in the circuit; 2) Drive losses of power switching transistors; 3) Equivalent Series Resistance (ESR) loss of each capacitor in the circuit.

[0030] Therefore, reducing the above-mentioned losses can improve the conversion efficiency of cascaded switched capacitor voltage converter circuits. Among them, the drive loss of the power switch is a significant factor affecting the circuit's conversion efficiency, and its drive loss is closely related to its own power supply drive network. Therefore, how to design the power supply drive network to reduce the drive loss of the power switch is of great significance for improving the conversion efficiency of cascaded switched capacitor voltage converters and is a technical problem that urgently needs to be solved.

[0031] Based on this, this application provides a driving circuit for a cascaded switched capacitor voltage converter circuit. This driving circuit can directly draw power from the output terminal of the cascaded switched capacitor voltage converter circuit and each capacitor according to power supply requirements, using the principle of equipotential compensation, to provide equipotential power to the driving circuits of each power switching transistor in the driving circuit. There is no voltage drop during the power supply process, thereby reducing additional losses during the driving process and improving the conversion efficiency of the cascaded switched capacitor voltage converter. The principle of equipotential compensation refers to using voltages of equal height in the circuit to compensate for voltages of equal height.

[0032] The cascaded switched capacitor voltage conversion circuit provided in this application embodiment, in Figure 1Based on the existing design, the voltage output terminal VOUT is improved to have two voltage output terminals, which can provide two equal or unequal output voltages. This cascaded switched-capacitor voltage converter circuit includes a first circuit unit and a second circuit unit. The input terminals of the first and second circuit units are connected to form the voltage input terminal of the cascaded switched-capacitor voltage converter circuit. The first output terminal of the first circuit unit is connected to the second output terminal of the second circuit unit to form the first voltage output terminal of the cascaded switched-capacitor voltage converter circuit. The second output terminal of the first circuit unit is connected to the first output terminal of the second circuit unit to form the second voltage output terminal of the cascaded switched-capacitor voltage converter circuit. Each circuit unit includes a first target capacitor, a second target capacitor, a third target capacitor, and a target switch group. The target switch group of the first and second circuit units is used to control the connection relationship of the first, second, and third target capacitors according to the voltage conversion ratio, forming two alternating phase stages. This allows the cascaded switched-capacitor voltage converter circuit to convert the input voltage at the voltage input terminal according to the voltage conversion ratio through the alternating operation of the two phase stages.

[0033] For example, Figure 2 This paper shows a schematic diagram of the structure of each circuit unit of the cascaded switched capacitor voltage conversion circuit provided in the embodiments of this application, with reference to... Figure 2As shown, each circuit unit includes a first target capacitor CF1, a second target capacitor CF2, a third target capacitor CF3, and a target switch group. The target switch group corresponding to each circuit unit (either the first or second circuit unit) includes a first target switch group 21, a second target switch group 22, and a third target switch group 23. For each circuit unit, the first terminal of the first target switch group 21 serves as the input terminal of that circuit unit; the connection of these input terminals of two circuit units serves as the voltage input terminal VIN of the cascaded switched capacitor voltage conversion circuit. The second terminal of the first target switch group 21 is connected to the positive plate of the first target capacitor CF1, the third terminal of the first target switch group 21 is connected to the positive plate of the second target capacitor CF2, and the fourth terminal of the first target switch group 21 is connected to the negative plate of the second target capacitor CF2. The first terminal of the second target switch group 22 is connected to the negative plate of the first target capacitor CF1, the second terminal of the second target switch group 22 is connected to the first terminal of the third target switch group 23 and the positive plate of the third target capacitor CF3, and the second terminal of the third target switch group 23 is connected to the negative plate of the third target capacitor CF3. When the circuit unit represents the first circuit unit, the output terminal O1 of the first target switch group 21 of the first circuit unit serves as the first output terminal of the first circuit unit, and the output terminal O2 of the third target switch group 23 of the first circuit unit serves as the second output terminal of the first circuit unit; when the circuit unit represents the second circuit unit, the output terminal O2 of the third target switch group 23 of the second circuit unit serves as the first output terminal of the second circuit unit, and the output terminal O1 of the first target switch group 21 of the second circuit unit serves as the second output terminal of the second circuit unit.

[0034] The first target switch group 21 includes a first target power switch Q1, a third target power switch Q3, a fifth target power switch Q5, a sixth target power switch Q6, and a seventh target power switch Q7. The second terminal of the first target power switch Q1 serves as the first terminal of the first target switch group 21 and is connected to the voltage input terminal VIN. The first terminal of the first target power switch Q1 is connected to the second terminal of the third target power switch Q3, and then serves as the second terminal of the first target switch group 21, connected to the positive plate of the first target capacitor CF1. The third target power switch Q3... One end is connected to the second end of the fifth target power switch Q5 and then serves as the third end of the first target switch group 21, which is connected to the positive plate of the second target capacitor CF2. The first end of the fifth target power switch Q5 is connected to the second end of the sixth target power switch Q6 and then serves as the output terminal O1 of the first target switch group 21. The first end of the sixth target power switch Q6 and the second end of the seventh target power switch Q7 are connected to the fourth end of the first target switch group 21 and then connected to the negative plate of the second target capacitor CF2. The first end of the seventh target power switch Q7 is connected to ground PGND.

[0035] The second target switch group 22 includes a second target power switch Q2 and a fourth target power switch Q4. The first terminal of the second target power switch Q2 is connected to ground PGND. The second terminal of the second target power switch Q2 is connected to the first terminal of the fourth target power switch Q4, and then serves as the first terminal of the second target switch group 22, which is connected to the negative plate of the first target capacitor CF1. The second terminal of the fourth target power switch Q4 serves as the second terminal of the second target switch group 22, which is connected to the positive plate of the third target capacitor CF3.

[0036] The third target switch group 23 includes an eighth target power switch Q8, a ninth target power switch Q9, and a tenth target power switch Q10. The second terminal of the eighth target power switch Q8 serves as the first terminal of the third target switch group 23 and is connected to the positive plate of the third target capacitor CF3. The first terminal of the eighth target power switch Q8 is connected to the second terminal of the ninth target power switch Q9 and serves as the output terminal O2 of the third target switch group 23. The first terminal of the ninth target power switch Q9 is connected to the second terminal of the tenth target power switch Q10 and serves as the second terminal of the third target switch group 23 and is connected to the negative plate of the third target capacitor CF3. The first terminal of the tenth target power switch Q10 is connected to ground PGND.

[0037] For example, each target power switch can be an N-type MOSFET or a P-type MOSFET. When each target power switch is an N-type MOSFET, the first terminal of the target power switch is the source and the second terminal is the drain; when each target power switch is a P-type MOSFET, the first terminal of the target power switch is the drain and the second terminal is the source.

[0038] For example, the first target capacitor CF1, the second target capacitor CF2, and the third target capacitor CF3 can be flying capacitors.

[0039] Specifically, in combination Figure 2 , Figure 3 A schematic diagram of the cascaded switched capacitor voltage conversion circuit provided in an embodiment of this application is shown. (Refer to...) Figure 3 As shown, the cascaded switched capacitor voltage converter circuit includes a first circuit unit 31 and a second circuit unit 32. The circuit structures of the first circuit unit 31 and the second circuit unit 32 are the same and symmetrically arranged. The input terminal of the first circuit unit 31 and the input terminal of the second circuit unit 32 are connected to serve as the voltage input terminal VIN of the cascaded switched capacitor voltage converter circuit. The first output terminal O1A of the first circuit unit 31 and the second output terminal O2B of the second circuit unit 32 are connected to serve as the first voltage output terminal VOUTA of the cascaded switched capacitor voltage converter circuit. The second output terminal O2A of the first circuit unit 31 and the first output terminal O1B of the second circuit unit 32 are connected to serve as the second voltage output terminal VOUTB of the cascaded switched capacitor voltage converter circuit.

[0040] For the first circuit unit 31, its corresponding first target capacitor is the first capacitor CF1A, its corresponding second target capacitor is the third capacitor CF2A, its corresponding third target capacitor is the fifth capacitor CF3A, its corresponding first target switch group is the first switch group 311, its corresponding second target switch group is the second switch group 312, and its corresponding third target switch group is the third switch group 313. The first switch group 311 includes the first target power switch transistor Q1A, the third target power switch transistor Q3A, the fifth target power switch transistor Q5A, the sixth target power switch transistor Q6A, and the seventh target power switch transistor Q7A. The second switch group 312 includes the second target power switch transistor Q2A and the fourth target power switch transistor Q4A. The third switch group 213 includes the eighth target power switch transistor, which is the fifteenth power switch transistor Q8A; the ninth target power switch transistor, which is the seventeenth power switch transistor Q9A; and the tenth target power switch transistor, which is the nineteenth power switch transistor Q10A.

[0041] For the second circuit unit 32, its corresponding first target capacitor is the second capacitor CF1B, its corresponding second target capacitor is the fourth capacitor CF2B, its corresponding third target capacitor is the sixth capacitor CF3B, its corresponding first target switch group is the fourth switch group 321, its corresponding second target switch group is the fifth switch group 322, and its corresponding third target switch group is the sixth switch group 323. The fourth switch group 321 includes the following first target power switches: the second power switch Q1B, the third target power switch Q3B, the fifth target power switch Q5B, the sixth target power switch Q6B, and the seventh target power switch Q7B. The fifth switch group 322 includes the following second target power switches: the fourth power switch Q2B and the eighth target power switch Q4B. The sixth switch group 323 includes the eighth target power switch transistor, which is the sixteenth power switch transistor Q8B; the ninth target power switch transistor, which is the eighteenth power switch transistor Q9B; and the tenth target power switch transistor, which is the twentieth power switch transistor Q10B.

[0042] Reference Figure 3The cascaded switched capacitor voltage conversion circuit provided in this application embodiment can achieve a voltage conversion ratio of 4:1, 3:1, or 2:1, and can provide two equal or unequal output voltages. Specifically, when the voltage conversion ratio is 4:1 or 2:1, the first output voltage output from the first voltage output terminal VOUTA and the second output voltage output from the second voltage output terminal VOUTB can be equal or unequal; when the voltage conversion ratio is 3:1, the first output voltage output from the first voltage output terminal VOUTA and the second output voltage output from the second voltage output terminal VOUTB are equal.

[0043] Specifically, when the voltage conversion ratio is 4:1, the operating voltage of the first capacitor CF1A is twice the first output voltage, the operating voltage of the second capacitor CF1B is twice the second output voltage, the operating voltage of the fifth capacitor CF3A is the second output voltage, and the operating voltages of the third capacitor CF2A, the fourth capacitor CF2B, and the sixth capacitor CF3B are the first output voltage.

[0044] With a voltage conversion ratio of 3:1, the operating voltage of the first capacitor CF1A is twice the first output voltage, the operating voltage of the second capacitor CF1B is twice the second output voltage, the operating voltages of the third capacitor CF2A and the sixth capacitor CF3B are the first output voltage, and the operating voltages of the fourth capacitor CF2B and the fifth capacitor CF3A are the second output voltage.

[0045] With a voltage conversion ratio of 2:1, the operating voltages of the first capacitor CF1A, the third capacitor CF2A, and the sixth capacitor CF3B constitute the first output voltage, while the operating voltages of the second capacitor CF1B, the fourth capacitor CF2B, and the fifth capacitor CF3A constitute the second output voltage.

[0046] The following is combined Figures 4-6 The driving circuit provided in the embodiments of this application will be described in detail.

[0047] Figure 4 A schematic diagram of the driving circuit provided in an embodiment of this application is shown. (Refer to...) Figure 4 As shown, the driving circuit may include a target driving circuit 401 and a target power supply circuit 402 corresponding to each circuit unit in the cascaded switched capacitor voltage conversion circuit. Combined with... Figure 2 and Figure 4The power supply terminal C2P of the target power supply circuit 402 is connected to the positive plate of the second target capacitor CF2. The first power supply terminal BST1 of the target power supply circuit 402 is connected to the first power supply terminal of the target drive circuit 401. The second power supply terminal BST2 of the target power supply circuit 402 is connected to the second power supply terminal of the target drive circuit 401. The third power supply terminal BST31 of the target power supply circuit 402 is connected to the third power supply terminal of the target drive circuit 401. The fourth power supply terminal of the target drive circuit 401 is connected to the power supply terminal C2P of the target power supply circuit 402. The fifth power supply terminal C1P of the target drive circuit 401 is connected to the positive plate of the first target capacitor CF1. The sixth power supply terminal of the target drive circuit 401... The electrical terminal C3P is used to connect to the positive plate of the third target capacitor CF3. The seventh power-taking terminal OUT of the target driving circuit 401 is used to connect to the first voltage output terminal VOUTA and / or the second voltage output terminal VOUTB of the cascaded switched capacitor voltage conversion circuit (that is, to connect to the output terminal O1 of the first target switch group 21 and / or the output terminal O2 of the third target switch group 23). The eighth power-taking terminal of the target driving circuit 401 is connected to the third power supply terminal BST32 of the target power supply circuit corresponding to another circuit unit. The control terminal P of the target driving circuit 401 is used to connect to the controlled terminal of the corresponding target switch group (including the first target switch group 21, the second target switch group 22 and the third target switch group 23).

[0048] Specifically, the seventh power-taking terminal OUT of the target driving circuit 401 can be connected to either the first voltage output terminal VOUTA or the second voltage output terminal VOUTB. Alternatively, the seventh power-taking terminal OUT of the target driving circuit 401 can include a first power-taking terminal and a second power-taking terminal. The first power-taking terminal and the second power-taking terminal can be selected to be connected to either the first voltage output terminal VOUTA or the second voltage output terminal VOUTB according to the principle of proximity deployment of circuit devices; for example, the first power-taking terminal is used to be connected to the first voltage output terminal VOUTA and the second power-taking terminal is used to be connected to the second voltage output terminal VOUTB, or the second power-taking terminal is used to be connected to the first voltage output terminal VOUTA and the first power-taking terminal is used to be connected to the second voltage output terminal VOUTB.

[0049] The control terminal P of the target drive circuit 401 may include control sub-terminals for each switch group in the target switch group, with each control sub-terminal connected to the controlled terminal of the corresponding switch group. For example, combined with Figure 2As shown, the first control sub-terminal of the control terminal P of the target driving circuit 401 can be connected to the controlled terminal of the first target switch group 21, and the switching state of each target power switch in the first target switch group 21 can be controlled through the first control sub-terminal; the second control sub-terminal of the control terminal P can be connected to the controlled terminal of the second target switch group 22, and the switching state of each target power switch in the second target switch group 22 can be controlled through the second control sub-terminal; the third control sub-terminal of the control terminal P can be connected to the controlled terminal of the third target switch group 23, and the switching state of each target power switch in the third target switch group 23 can be controlled through the third control sub-terminal.

[0050] Combination Figure 2 It is understood that each target switch group may include multiple target power switches, and the gate of each target power switch can be used as the controlled terminal of the target switch group. Correspondingly, the control sub-terminal of the target switch group includes a sub-terminal for each target power switch, which is connected to the gate of the corresponding target power switch.

[0051] exist Figure 4 In this circuit, the target power supply circuit 402 can be used to obtain electrical energy from the second target capacitor of the cascaded switched capacitor voltage conversion circuit according to the principle of equipotential power supplementation and the phase stage of alternating operation of the cascaded switched capacitor voltage conversion circuit, and supplement the first power supply terminal BST1, the second power supply terminal BST2 and the third power supply terminal BST31 of the target power supply circuit 402.

[0052] The principle of equipotential compensation refers to using voltages at the same level in a circuit to compensate for voltages at the same level. For the cascaded switched-capacitor voltage conversion circuit, the target drive circuit 401 includes drive circuit units for each target power switch in the target switch group. These drive circuit units are all low-voltage devices, such as drive circuit units powered by 5V. The cascaded switched-capacitor voltage conversion circuit can provide the required supply voltage for these drive circuit units. Therefore, the target power supply circuit 402 can use the voltage at the same level in the cascaded switched-capacitor voltage conversion circuit to supply power to the target drive circuit 401. The target drive circuit 401 can obtain electrical energy from the equipotential points in the target power supply circuit 402 and the cascaded switched-capacitor voltage conversion circuit.

[0053] Specifically, in one embodiment, the target power supply circuit 402 can be specifically used to: obtain electrical energy from the second target capacitor of the cascaded switched capacitor voltage conversion circuit when the corresponding circuit unit is working in the first target phase stage, according to the equipotential compensation principle, and supplement the third power supply terminal BST31 of the target power supply circuit 402 with the electrical energy; supplement the second power supply terminal BST2 from the third power supply terminal BST31 when the corresponding circuit unit is working in the second target phase stage; and supplement the first power supply terminal BST1 from the second power supply terminal BST2 when the corresponding circuit unit switches from the second target phase stage to the first target phase stage.

[0054] The first and second target phase stages are determined based on the phase stages of the corresponding circuit units and the cascaded switched capacitor voltage conversion circuit. The first and second target phase stages for the two circuit units are opposite to each other. Specifically, in conjunction with... Figure 3 For the first circuit unit 31, the first target phase stage is the first phase stage of the cascaded switched capacitor voltage conversion circuit operation, and the second target phase stage is the second phase stage of the cascaded switched capacitor voltage conversion circuit operation; for the second circuit unit 32, the first target phase stage is the second phase stage of the cascaded switched capacitor voltage conversion circuit operation, and the second target phase stage is the first phase stage of the cascaded switched capacitor voltage conversion circuit operation.

[0055] Understandably, when the cascaded switched-capacitor voltage conversion circuit operates in the first phase, the target power supply circuit 402 corresponding to the first circuit unit 31 obtains power from the corresponding second target capacitor (i.e., the third capacitor CF2A) and replenishes it to its third power supply terminal BST31, and also replenishes power from the second power supply terminal BST2 to the first power supply terminal BST1; simultaneously, the target power supply circuit 402 corresponding to the second circuit unit 32 replenishes power from its third power supply terminal BST31 to its second power supply terminal BST2. When the cascaded switched-capacitor voltage conversion circuit operates in the second phase, the target power supply circuit 402 corresponding to the first circuit unit 31 replenishes power from the third power supply terminal BST31 to the second power supply terminal BST2; simultaneously, the target power supply circuit 402 corresponding to the second circuit unit 32 obtains power from the corresponding second target capacitor (i.e., the fourth capacitor CF2B) and replenishes it to its third power supply terminal BST31, and also replenishes power from the second power supply terminal BST2 to the first power supply terminal BST1.

[0056] The cascaded switched capacitor voltage conversion circuit provided in this application embodiment can achieve voltage and current conversion with a voltage conversion ratio of 4:1, 3:1, or 2:1, as well as corresponding reverse fixed ratio voltage and current conversion. Combined with... Figure 3Taking a voltage conversion ratio of 4:1 as an example, with the first power switch Q1A, the seventh power switch Q4A, the ninth power switch Q5A, the thirteenth power switch Q7A, the seventeenth power switch Q9A, the fourth power switch Q2B, the sixth power switch Q3B, the twelfth power switch Q6B, the sixteenth power switch Q8B, and the twentieth power switch Q10B turned off, and the third power switch Q2A, the fifth power switch Q3A, the eleventh power switch Q6A, the fifteenth power switch Q8A, the nineteenth power switch Q10A, the second power switch Q1B, the eighth power switch Q4B, the tenth power switch Q5B, the fourteenth power switch Q7B, and the eighteenth power switch Q9B turned on, the cascaded switched capacitor voltage conversion circuit operates. In the first phase, with the first power switch Q1A, the seventh power switch Q4A, the ninth power switch Q5A, the thirteenth power switch Q7A, the seventeenth power switch Q9A, the fourth power switch Q2B, the sixth power switch Q3B, the twelfth power switch Q6B, the sixteenth power switch Q8B, and the twentieth power switch Q10B turned on, and the third power switch Q2A, the fifth power switch Q3A, the eleventh power switch Q6A, the fifteenth power switch Q8A, the nineteenth power switch Q10A, the second power switch Q1B, the eighth power switch Q4B, the tenth power switch Q5B, the fourteenth power switch Q7B, and the eighteenth power switch Q9B turned off, the cascaded switched capacitor voltage conversion circuit operates in the second phase.

[0057] For example, Figure 5 A schematic diagram of the target power supply circuit provided in an embodiment of this application is shown, with reference to... Figure 5 As shown, the target power supply circuit 402 may include a first target bootstrap capacitor CBST1, a second target bootstrap capacitor CBST2, a third target bootstrap capacitor CBST3, a first target switch M1, a second target switch M2, a third target switch M3, and a fourth target switch M4.

[0058] Combination Figure 2 and Figure 5The positive plate of the first target bootstrap capacitor CBST1 is connected to the first terminal of the third target switch M3, serving as the first power supply terminal BST1 of the target power supply circuit 402. The negative plate of the first target bootstrap capacitor CBST1 serves as the first connection terminal E1 of the target power supply circuit 402, used to connect to the positive plate of the first target capacitor CF1 of the cascaded switched capacitor voltage conversion circuit. The positive plate of the second target bootstrap capacitor CBST2 is connected to the second terminal of the third target switch M3 and the first terminal of the second target switch M2, serving as the second power supply terminal BST2 of the target power supply circuit 402. The negative plate of the second target bootstrap capacitor CBST2 is connected to the first terminal of the fourth target switch M4, serving as the power take-off terminal C2P of the target power supply circuit 402. The second terminal of the fourth target switch M4 is connected to the second terminal of the first target switch M1. The first terminal of the first target switch M1, the second terminal of the second target switch M2, and the positive plate of the third target bootstrap capacitor CBST3 are connected to serve as the third power supply terminal BST31 of the target power supply circuit 402. Figure 3 For the first circuit unit 31, the negative plate of its corresponding third target bootstrap capacitor CBST3 serves as the second connection terminal E2 of the target power supply circuit 402 and is used to connect to the first voltage output terminal VOUTA of the cascaded switched capacitor voltage conversion circuit; for the second circuit unit 32, the negative plate of its corresponding third target bootstrap capacitor CBST3 serves as the second connection terminal E2 of the target power supply circuit 402 and is used to connect to the second voltage output terminal VOUTB.

[0059] Among them, the first target switch M1, the second target switch M2, the third target switch M3 and the fourth target switch M4 can be N-type MOSFETs or P-type MOSFETs. When each target switch is an N-type MOSFET, its first terminal is the drain and its second terminal is the source; when each target switch is a P-type MOSFET, its first terminal is the source and its second terminal is the drain.

[0060] according to Figure 5The target power supply circuit 402 shown, when the voltage conversion ratio is 4:1 or 3:1, the first target switch M1 and the third target switch M3 are turned on when their corresponding circuit units operate in the first target phase, and turned off when their corresponding circuit units operate in the second target phase; the second target switch M2 is turned off when its corresponding circuit unit operates in the first target phase, and turned on when its corresponding circuit unit operates in the second target phase; the fourth target switch M4 remains on in both target phases. When the first target switch M1 is on, the third target bootstrap capacitor CBST3 obtains power from the second target capacitor through its power-taking terminal C2P and supplies this power to the third power supply terminal BST31. When the voltage conversion ratio is 2:1, the first target switch M1 is turned on when its corresponding circuit unit operates in the first target phase, and turned off when its corresponding circuit unit operates in the second target phase; the second target switch M2 and the third target switch M3 are simultaneously turned off when their corresponding circuit units operate in the first target phase, and simultaneously turned on when their corresponding circuit units operate in the second target phase.

[0061] When the second target switch M2 is turned on, the second target bootstrap capacitor CBST2 draws power from the third power supply terminal BST31 and replenishes the second power supply terminal BST2 with the obtained power. When the third target switch M3 is turned on, the first target bootstrap capacitor CBST1 draws power from the second power supply terminal BST2 and replenishes the first power supply terminal BST1 with the obtained power. Thus, during the alternating operation of the cascaded switched capacitor voltage conversion circuit in the two phase stages, the target power supply circuit 402 can use the power obtained from the second target capacitor to replenish the first power supply terminal BST1, the second power supply terminal BST2, and the third power supply terminal BST31. During the replenishment process, there is no voltage drop across the corresponding target switches, and no additional power loss is generated in the replenishment channel.

[0062] Specifically, in combination Figure 3 For the first circuit unit 31, the first target phase stage is the first phase stage of the cascaded switched capacitor voltage conversion circuit operation, and the second target phase stage is the second phase stage of the cascaded switched capacitor voltage conversion circuit operation; for the second circuit unit 32, the first target phase stage is the second phase stage of the cascaded switched capacitor voltage conversion circuit operation, and the second target phase stage is the first phase stage of the cascaded switched capacitor voltage conversion circuit operation.

[0063] When the voltage conversion ratio is 4:1 or 3:1, taking the target power supply circuit 402 corresponding to the first circuit unit 31 as an example, when the cascaded switched capacitor voltage conversion circuit is working in the first phase stage, the first target switch M1, the third target switch M3 and the fourth target switch M4 are turned on and the second target switch M2 is turned off. At this time, the first target bootstrap capacitor CBST3 obtains electrical energy from the second target capacitor (i.e., the third capacitor CF2A) through the power taking terminal C2P and replenishes the obtained electrical energy to the third power supply terminal BST31. The first target bootstrap capacitor CBST1 obtains electrical energy from the second power supply terminal BST2 (i.e., obtains electrical energy from the second target bootstrap capacitor CBST2) and replenishes the obtained electrical energy to the first power supply terminal BST1. When the cascaded switched capacitor voltage conversion circuit is operating in the second phase stage, the first target switch M1 and the third target switch M3 are turned off and the second target switch M2 and the fourth target switch M4 are turned on. At this time, the second target bootstrap capacitor CBST2 obtains power from the third power supply terminal BST31 and replenishes the obtained power to the second power supply terminal BST2.

[0064] When the voltage conversion ratio is 2:1, taking the target power supply circuit 402 corresponding to the first circuit unit 31 as an example, when the cascaded switched capacitor voltage conversion circuit is working in the first phase stage, the first target switch M1 and the fourth target switch M4 are turned on, and the second target switch M2 and the third target switch M3 are turned off. At this time, the first target bootstrap capacitor CBST3 obtains electrical energy from the second target capacitor (i.e., the third capacitor CF2A) through the power taking terminal C2P and replenishes the obtained electrical energy to the third power supply terminal BST31. When the cascaded switched capacitor voltage conversion circuit is working in the second phase stage, the second target switch M2, the third target switch M3 and the fourth target switch M4 are turned on, and the first target switch M1 is turned off. At this time, the second target bootstrap capacitor CBST2 obtains electrical energy from the third power supply terminal BST31 and replenishes the obtained electrical energy to the second power supply terminal BST2, and the first target bootstrap capacitor CBST1 obtains electrical energy from the second power supply terminal BST2 and replenishes the first power supply terminal BST1.

[0065] Reference Figure 4 The target drive circuit 401 can be used to control the cascaded switched capacitor voltage conversion circuit to alternately execute two phase stages based on the power supply voltage of the first power supply terminal BST1, the second power supply terminal BST2 and the third power supply terminal BST31 of the target power supply circuit 402, the power supply voltage obtained from the first target capacitor, the second target capacitor and the third target capacitor according to the principle of equipotential compensation, and the output voltage obtained from the first voltage output terminal VOUTA and / or the second voltage output terminal VOUTB, according to the received drive control signal.

[0066] Specifically, the target power supply circuit 402 can provide the electrical energy obtained from the output of the cascaded switched capacitor voltage conversion circuit and each target capacitor to the power switch driving circuits corresponding to each target switch group in the target drive circuit 401 according to the principle of equipotential compensation, so as to provide equipotential power supply to each power switch driving circuit. In the power supply state, the target drive circuit 401 can control the cascaded switched capacitor voltage conversion circuit to alternately execute two phase stages according to the received drive control signal.

[0067] For example, Figure 6 A schematic diagram of the target driving circuit provided in an embodiment of this application is shown, with reference to... Figure 6 As shown, the target driving circuit may include a first target sub-driving circuit 61 corresponding to the first target switch group 21, a second target sub-driving circuit 62 corresponding to the second target switch group 22, and a third target sub-driving circuit 63 corresponding to the third target switch group 23. The control terminal of the first target sub-driving circuit 61 is used to connect to the controlled terminal of the first target switch group 21. The first power-taking terminal a1 of the first target sub-driving circuit 61 is connected to the first power-taking terminal BST1 of the target power supply circuit 402. The second power-taking terminal a2 of the first target sub-driving circuit 61 is connected to the second power-taking terminal BST2 of the target power supply circuit 402. The third power-taking terminal a3 of the first target sub-driving circuit 61 is connected to the third power-taking terminal BST31 of the target power supply circuit 402. The fourth power-taking terminal a4 of the first target sub-driving circuit 61 is connected to the power-taking terminal C2P of the target power supply circuit 402. The control terminal of the second target sub-driving circuit 62 is used to connect to the controlled terminal of the second target switch group 22. The first power-taking terminal b1 of the second target sub-driving circuit 62 is used as the fifth power-taking terminal C1P of the target driving circuit and is used to connect to the positive plate of the first target capacitor CF1. The second power-taking terminal b2 of the second target sub-driving circuit 62 is connected to the fifth power-taking terminal a5 of the first target sub-driving circuit 61 and is used as the first sub-terminal of the seventh power-taking terminal OUT of the target driving circuit and is used to connect to the first voltage output terminal VOUTA. The control terminal of the third target sub-drive circuit 63 is used to connect with the controlled terminal of the third target switch group 23. The first power-taking terminal c1 of the third target sub-drive circuit 63 is used as the eighth power-taking terminal of the target drive circuit and is connected to the third power supply terminal BST32 of the target power supply circuit corresponding to another circuit unit. The second power-taking terminal c2 of the third target sub-drive circuit 63 is used as the sixth power-taking terminal C3P of the target drive circuit and is used to connect with the positive plate of the third target capacitor CF3. The third power-taking terminal c3 of the third target sub-drive circuit 63 is used as the second sub-terminal of the seventh power-taking terminal OUT of the target drive circuit and is used to connect with the second voltage output terminal VOUTB.

[0068] The first target sub-driving circuit 61 is used to control the switching state of the first target switch group 21 according to the received driving control signal based on the power supply voltage obtained from the second target capacitor CF2, the first output voltage obtained from the first voltage output terminal VOUTA, and the power supply voltage provided by the first power supply terminal BST1, the second power supply terminal BST2 and the third power supply terminal BST31 of the target power supply circuit 402.

[0069] For example, such as Figure 6As shown, the first target sub-driving circuit 61 includes a first target power switch driving circuit D1 corresponding to the first target power switch Q1, a third target power switch driving circuit D3 corresponding to the third target power switch Q3, a fifth target power switch driving circuit D5 corresponding to the fifth target power switch Q5, a sixth target power switch driving circuit D6 corresponding to the sixth target power switch Q6, and a seventh target power switch driving circuit D7 corresponding to the seventh target power switch Q7. The driving terminal of the first target power switch driving circuit D1 serves as the first control terminal h1 of the first target sub-driving circuit 61, connected to the controlled terminal of the first target power switch Q1. The first power-taking terminal of the first target power switch driving circuit D1 serves as the first power-taking terminal a1 of the first target sub-driving circuit 61, connected to the first power-supply terminal BST1 of the target power supply circuit 402. The second power-taking terminal of the first target power switch driving circuit D1 is connected to the first connection terminal E1 of the target power supply circuit 402. The driving terminal of the third target power switch driving circuit D3 serves as the second control terminal h1 of the first target sub-driving circuit 61. The control terminal h2 is used to connect to the controlled terminal of the third target power switch Q3. The first power-taking terminal of the third target power switch drive circuit D3 serves as the second power-taking terminal a2 of the first target sub-drive circuit 61 and is connected to the second power supply terminal BST2 of the target power supply circuit 402. The second power-taking terminal of the third target power switch drive circuit D3 is connected to the power-taking terminal C2P of the target power supply circuit 402. The drive terminal of the fifth target power switch drive circuit D5 serves as the third control terminal h3 of the first target sub-drive circuit 61 and is used to connect to the controlled terminal of the fifth target power switch Q5. The first power-taking terminal of circuit D5 serves as the third power-taking terminal a3 of the first target sub-drive circuit 61 and is connected to the third power supply terminal BST31 of the target power supply circuit 402. The second power-taking terminal of the fifth target power switch drive circuit D5 is used to connect to the output terminal O1 of the first target switch group 21. The driving terminal of the sixth target power switch drive circuit D6 serves as the fourth control terminal h4 of the first target sub-drive circuit 61 and is used to connect to the controlled terminal of the sixth target power switch Q6. The first power-taking terminal of the sixth target power switch drive circuit D6 serves as the fourth power-taking terminal a4 of the first target sub-drive circuit 61 and is connected to the target power supply circuit 402. The power supply terminal C2P of circuit 402 is connected. The second power supply terminal of the sixth target power switch driver circuit D6 is used to connect to the negative plate of the second target capacitor CF2. The driving terminal of the seventh target power switch driver circuit D7 serves as the fifth control terminal h5 of the first target sub-driver circuit 61 and is used to connect to the controlled terminal of the seventh target power switch Q7. The first power supply terminal of the seventh target power switch driver circuit D7 serves as the fifth power supply terminal a5 of the first target sub-driver circuit 61 and is used to connect to the first voltage output terminal VOUTA. The second power supply terminal of the seventh target power switch driver circuit D7 is connected to ground PGND.

[0070] Specifically, the sixth target power switch driver circuit D6 can directly draw power from the second target capacitor CF2 at the same potential, and the seventh target power switch driver circuit D7 can be directly powered by the first voltage output terminal VOUTA. The power supplies for the first target power switch driver circuit D1, the third target power switch driver circuit D3, and the fifth target power switch driver circuit D5 can be obtained from the second target capacitor CF2 by the target power supply circuit 402 and then transmitted and provided through a voltage drop compensation path. In this way, each target power switch driver circuit in the first target sub-driver circuit 61 can draw power from the equipotential point of the cascaded switched capacitor voltage conversion circuit, avoiding additional power loss and greatly reducing the additional losses during the driving process of the driver circuit.

[0071] For example, the cascaded switched capacitor voltage conversion circuit provided in this application embodiment can achieve a voltage conversion ratio of 4:1, 3:1, or 2:1, and can provide two equal or unequal output voltages. When the cascaded switched capacitor voltage conversion circuit operates in a 2:1 voltage conversion ratio mode and the first target sub-driving circuit 61 controls the third target power switch Q3 to remain on in both phase stages, the first output voltage output from the first voltage output terminal VOUTA and the second output voltage output from the second voltage output terminal VOUTB are equal. When the cascaded switched capacitor voltage conversion circuit operates in a 2:1 voltage conversion ratio mode and the first target sub-driving circuit 61 controls the third target power switch Q3 to alternately conduct in both phase stages, the first output voltage output from the first voltage output terminal VOUTA and the second output voltage output from the second voltage output terminal VOUTB are not equal.

[0072] The second target sub-driving circuit 62 is used to control the switching state of the second target switch group 22 according to the received driving control signal based on the supply voltage obtained from the first target capacitor CF1 and the first output voltage obtained from the first voltage output terminal VOUTA.

[0073] For example, such as Figure 6As shown, the second target sub-driving circuit 62 includes a second target power switch driving circuit D2 corresponding to the second target power switch Q2 and a fourth target power switch driving circuit 621 corresponding to the fourth target power switch Q4. The driving terminal of the second target power switch driving circuit D2 serves as the first control terminal h6 of the second target sub-driving circuit 62 and is connected to the controlled terminal of the second target power switch Q2. The first power-taking terminal of the second target power switch driving circuit D2 serves as the second power-taking terminal b2 of the second target sub-driving circuit 62 and is connected to the first voltage output terminal VOUTA. The second power-taking terminal of the second target power switch driving circuit D2 is connected to ground PGND. The driving terminal of the fourth target power switch driving circuit 621 serves as the second control terminal h7 of the second target sub-driving circuit 62 and is connected to the controlled terminal of the fourth target power switch Q4. The first power-taking terminal of the fourth target power switch driving circuit 621 serves as the first power-taking terminal b1 of the second target sub-driving circuit 62 (that is, as the fifth power-taking terminal C1P of the target driving circuit) and is connected to the positive plate of the first target capacitor CF1. The second power-taking terminal of the fourth target power switch driving circuit 621 is connected to the negative plate of the first target capacitor CF1.

[0074] The second target power switch driver circuit D2 can be directly powered by the first voltage output terminal VOUTA, and the fourth target power switch driver circuit 621 can draw power from the first target capacitor CF1, which is at the same potential. In this way, each target power switch driver circuit in the second target sub-driver circuit 62 can draw power from the cascaded switched capacitor voltage conversion circuit, avoiding additional power loss and greatly reducing the additional losses during the driving process of the driver circuit.

[0075] Reference Figure 6 In one embodiment, the fourth target power switch driving circuit 621 may include only the fourth target driving unit D4. The first power-taking terminal of the fourth target driving unit D4 serves as the first power-taking terminal b1 of the fourth target power switch driving circuit 621 and is connected to the positive plate of the first target capacitor CF1. The second power-taking terminal of the fourth target driving unit D4 serves as the second power-taking terminal of the fourth target power switch driving circuit 621 and is connected to the negative plate of the first target capacitor CF1. In this way, the fourth target power switch driving circuit 621 can directly draw power from the first target capacitor CF1, which is at the same potential.

[0076] Considering that the fourth target power switch drive circuit 621 needs to obtain power from the first target capacitor CF1, and the first target capacitor CF1 is connected to the voltage input terminal VIN of the cascaded switched capacitor voltage conversion circuit through the first target power switch Q1, it is easily affected by voltage fluctuations at the voltage input terminal VIN.

[0077] In view of this, refer to Figure 6 In one embodiment, the driving circuit provided in this application may further include a boost circuit 60. The input terminal of the boost circuit 60 is connected to the voltage input terminal VIN of the cascaded switched capacitor voltage conversion circuit, and the output terminal VHCP of the boost circuit 60 is used to output the boosted power supply voltage. The boost circuit 60 is used to boost the voltage input at the voltage input terminal VIN to obtain the boosted power supply voltage. The fourth target power switch driving circuit 621 may include a fourth target driving unit D4, a target driving control switch M5, a target Zener diode ZD, and a fourth target capacitor C0. The drain of the target drive control switch M5 serves as the first power-taking terminal b1 of the fourth target power switch drive circuit 621, which is connected to the positive plate of the first target capacitor CF1. The gate of the target drive control switch M5 is connected to the negative terminal of the target Zener diode ZD and the positive plate of the fourth target capacitor C0, and then serves as the third power-taking terminal of the fourth target power switch drive circuit 621, which is connected to the output terminal VHCP of the boost circuit 60. The source of the target drive control switch M5 is connected to the first power-taking terminal of the fourth target drive unit D4. The second power-taking terminal of the fourth target drive unit D4, the positive terminal of the target Zener diode ZD, and the negative plate of the fourth target capacitor C0 are connected, and then serve as the second power-taking terminal of the fourth target power switch drive circuit 621, which is connected to the negative plate of the first target capacitor CF1.

[0078] In this way, the fourth target power switch drive circuit 621 can use the target drive control switch M5, the target Zener diode ZD and the fourth target capacitor C0 to clamp the power obtained from the first target capacitor CF1 to the power supply voltage required by the fourth target drive unit D4, thereby avoiding the power supply fluctuation of the fourth target drive unit D4 caused by the voltage fluctuation of the first target capacitor CF1 being easily affected by the voltage fluctuation of the voltage input terminal VIN, and realizing the function of voltage regulation.

[0079] The third target sub-driving circuit 63 is used to control the switching state of the third target switch group 23 according to the received driving control signal based on the power supply voltage obtained from the third power supply terminal BST32 of the target power supply circuit corresponding to another circuit unit, the power supply voltage obtained from the third target capacitor CF3, and the second output voltage obtained from the second voltage output terminal VOUTB.

[0080] For example, such as Figure 6As shown, the third target sub-driving circuit 63 includes an eighth target power switch driving circuit D8 corresponding to the eighth target power switch Q8, a ninth target power switch driving circuit D9 corresponding to the ninth target power switch Q9, and a tenth target power switch driving circuit D10 corresponding to the tenth target power switch Q10. The driving terminal of the eighth target power switch driving circuit D8 serves as the first control terminal h8 of the third target sub-driving circuit 63 and is connected to the controlled terminal of the eighth target power switch Q8. The first power-taking terminal of the eighth target power switch driving circuit D8 serves as the first power-taking terminal c1 of the third target sub-driving circuit 63 and is connected to the third power-supply terminal BST32 of the target power supply circuit corresponding to another circuit unit. The second power-taking terminal of the eighth target power switch driving circuit D8 is connected to the output terminal O2 of the third target switch group. The driving terminal of the ninth target power switch driving circuit D9 serves as the second control terminal h9 of the third target sub-driving circuit 63 and is connected to the controlled terminal of the ninth target power switch Q9. The first power-taking terminal of circuit D9 serves as the second power-taking terminal c2 of the third target sub-drive circuit 63, and is used to connect to the positive plate of the third target capacitor CF3. The second power-taking terminal of the ninth target power switch drive circuit D9 is used to connect to the negative plate of the third target capacitor CF3. The driving terminal of the tenth target power switch drive circuit D10 serves as the third control terminal h10 of the third target sub-drive circuit 63, and is used to connect to the controlled terminal of the tenth target power switch Q10. The first power-taking terminal of the tenth target power switch drive circuit D10 serves as the third power-taking terminal c3 of the third target sub-drive circuit 63, and is used to connect to the second voltage output terminal VOUTB. The second power-taking terminal of the tenth target power switch drive circuit D10 is connected to ground PGND.

[0081] Specifically, the eighth target power switch driver circuit D8 can draw power from the third power supply terminal BST32 of the target power supply circuit corresponding to another circuit unit; the ninth target power switch driver circuit D9 can draw power from the third target capacitor CF3; and the tenth target power switch driver circuit D10 can be directly powered by the second voltage output terminal VOUTB. In this way, each target power switch driver circuit in the third target sub-driver circuit 63 can draw power from the equipotential point of the cascaded switched capacitor voltage conversion circuit, avoiding additional power loss and greatly reducing additional losses during the driving process.

[0082] For example, the cascaded switched capacitor voltage conversion circuit provided in this application embodiment can achieve a voltage conversion ratio of 4:1, 3:1, or 2:1, and can provide two equal or unequal output voltages. When the cascaded switched capacitor voltage conversion circuit operates in a working mode with a voltage conversion ratio of 2:1 or 3:1, the third target sub-driving circuit 63 controls the ninth target power switch Q9 to remain in the off state in both phase stages, and controls the eighth target power switch Q8 and the tenth target power switch Q10 to remain in the on state in both phase stages.

[0083] The driving circuit provided in this application includes a target driving circuit and a target power supply circuit corresponding to each circuit unit of the cascaded switched capacitor voltage converter circuit. The target power supply circuit obtains electrical energy from the second target capacitor according to the equipotential compensation principle and the alternating phase stages of the cascaded switched capacitor voltage converter circuit, and replenishes the electrical energy to the first, second, and third power supply terminals of the target power supply circuit. The target driving circuit, based on the supply voltages of the first, second, and third power supply terminals of the target power supply circuit, the supply voltages obtained from the first, second, and third target capacitors according to the equipotential compensation principle, and the output voltages obtained from the first and / or second voltage output terminals, controls the cascaded switched capacitor voltage converter circuit to alternately execute two phase stages according to the received driving control signal, thus realizing the power supply driving function. In this way, according to the power supply requirements of the target driving circuit, power can be directly drawn from the output terminal of the cascaded switched capacitor voltage converter circuit and each capacitor through the equipotential compensation principle to provide equipotential power to the target driving circuit. There is no voltage drop during the power supply process, which greatly reduces the additional losses during the driving process and improves the conversion efficiency of the cascaded switched capacitor voltage converter.

[0084] Based on the above embodiments, in one embodiment of this application, when the cascaded switched capacitor voltage conversion circuit operates in a working mode with a voltage conversion ratio of 4:1, the first output voltage output by the first voltage output terminal VOUTA and the second output voltage output by the second voltage output terminal VOUTB are equal or unequal; when the cascaded switched capacitor voltage conversion circuit operates in a working mode with a voltage conversion ratio of 3:1, the first output voltage output by the first voltage output terminal VOUTA and the second output voltage output by the second voltage output terminal VOUTB are equal.

[0085] This application also provides a cascaded switched-capacitor voltage converter, which may include a cascaded switched-capacitor voltage conversion circuit and a driving circuit as described in any of the above embodiments. The cascaded switched-capacitor voltage conversion circuit includes a first circuit unit and a second circuit unit; the input terminals of the first and second circuit units are connected to serve as the voltage input terminal of the cascaded switched-capacitor voltage conversion circuit; the first output terminal of the first circuit unit is connected to the first output terminal of the second circuit unit to serve as the first voltage output terminal of the cascaded switched-capacitor voltage conversion circuit; the second output terminal of the first circuit unit is connected to the second output terminal of the second circuit unit to serve as the second voltage output terminal of the cascaded switched-capacitor voltage conversion circuit; each circuit unit includes a first target capacitor, a second target capacitor, a third target capacitor, and a target switch group; the target switch group of the first and second circuit units is used to control the connection relationship of the first, second, and third target capacitors according to the voltage conversion ratio, forming two alternating phase stages, so that the cascaded switched-capacitor voltage conversion circuit converts the input voltage at the voltage input terminal according to the voltage conversion ratio through the alternating operation of the two phase stages. For example, the cascaded switched-capacitor voltage conversion circuit can be as follows: Figure 3 The circuit structure shown is shown.

[0086] The following is an example Figure 3 Taking the cascaded switched capacitor voltage converter circuit shown as an example, and in conjunction with the driving circuits of the above embodiments, the cascaded switched capacitor voltage converter provided in this application embodiment will be further illustrated.

[0087] Figure 7 This paper shows a schematic diagram of a cascaded switched capacitor voltage converter according to an embodiment of this application. (Refer to...) Figure 7 As shown, the left circuit 71 of the cascaded switched capacitor voltage converter includes a first circuit unit of the cascaded switched capacitor voltage conversion circuit, a target power supply circuit (first power supply circuit 402A) corresponding to the first circuit unit, and a power switch driving circuit corresponding to each power switch in the first circuit unit; the right circuit 72 of the cascaded switched capacitor voltage converter includes a second circuit unit of the cascaded switched capacitor voltage conversion circuit, a target power supply circuit (second power supply circuit 402B) corresponding to the second circuit unit, and a power switch driving circuit corresponding to each power switch in the second circuit unit.

[0088] Specifically, the first connection terminal E1A of the first power supply circuit 402A is connected to the positive plate of the first capacitor CF1A of the cascaded switched capacitor voltage conversion circuit, the first connection terminal E1B of the second power supply circuit 402B is connected to the positive plate of the second capacitor CF1B of the cascaded switched capacitor voltage conversion circuit, the first output terminal O1A of the first circuit unit is connected to the second output terminal O2B of the second circuit unit and serves as the first voltage output terminal VOUTA of the cascaded switched capacitor voltage conversion circuit, and the second output terminal O2A of the first circuit unit is connected to the first output terminal O1B of the second circuit unit and serves as the second voltage output terminal VOUTB of the cascaded switched capacitor voltage conversion circuit.

[0089] The first power supply circuit 402A includes the following target bootstrap capacitors: CBST1A (first target bootstrap capacitor), CBST2A (second target bootstrap capacitor), CBST3A (third target bootstrap capacitor), M1A (first target switch), M2A (second target switch), M3A (third target switch), and M4A (fourth target switch). The first target power switch Q1A is driven by the first target power switch driver circuit D1A; the third target power switch Q2A is driven by the third target power switch driver circuit D2A; the fifth target power switch Q3A is driven by the fifth target power switch driver circuit D3A; the seventh target power switch Q4A is driven by the seventh target power switch driver circuit 621A; the ninth target power switch Q5A is driven by the ninth target power switch driver circuit D5A; and the eleventh target power switch Q4A is driven by the eleventh target power switch driver circuit D5A. The sixth target power switch driver circuit corresponding to switch Q6A is the eleventh power switch driver circuit D6A; the seventh target power switch driver circuit corresponding to the thirteenth power switch Q7A is the thirteenth power switch driver circuit D7A; the eighth target power switch driver circuit corresponding to the fifteenth power switch Q8A is the fifteenth power switch driver circuit D8A; the ninth target power switch driver circuit corresponding to the seventeenth power switch Q9A is the seventeenth power switch driver circuit D9A; and the tenth target power switch driver circuit corresponding to the nineteenth power switch Q10A is the nineteenth power switch driver circuit D10A.

[0090] In this circuit, the second power-taking terminal of each power switch driver circuit is connected to the first terminal of the power switch it drives, and can draw power from the first terminal of the corresponding power switch. The first power-taking terminal of the first power switch driver circuit D1A draws power from the first power supply terminal BST1A of the first power supply circuit 402A; the first power-taking terminals of the third power switch driver circuit D2A and the thirteenth power switch driver circuit D7A can draw power from the first voltage output terminal VOUTA; the first power-taking terminal of the fifth power switch driver circuit D3A can draw power from the second power supply terminal BST2A of the first power supply circuit 402A; the first power-taking terminal of the seventh power switch driver circuit 621A can draw power from the positive plate C1PA of the first capacitor CF1A; and the ninth power switch driver circuit D5... The first power supply terminal of A can be powered from the third power supply terminal BST3A of the first power supply circuit 402A; the first power supply terminal of the eleventh power switch driver circuit D6A can be powered from the positive plate C2PA of the third capacitor CF2A; the first power supply terminal of the fifteenth power switch driver circuit D8A can be powered from the third power supply terminal BST3B of the second power supply circuit 402B; the first power supply terminal of the seventeenth power switch driver circuit D9A can be powered from the positive plate C3PA of the fifth capacitor CF3A; and the first power supply terminal of the nineteenth power switch driver circuit D10A can be powered from the second voltage output terminal VOUTB.

[0091] The second power supply circuit 402B includes the following target bootstrap capacitors: CBST1B (first target bootstrap capacitor), CBST2B (fourth target bootstrap capacitor), CBST3B (third target bootstrap capacitor), M1B (second target switch), M2B (fourth target switch), M3B (sixth target switch), and M4B (eighth target switch). The first target power switch drive circuit corresponding to the second power switch Q1B is the second power switch drive circuit D1B; the second target power switch drive circuit corresponding to the fourth power switch Q2B is the fourth power switch drive circuit D2B; the third target power switch drive circuit corresponding to the sixth power switch Q3B is the sixth power switch drive circuit D3B; the fourth target power switch drive circuit corresponding to the eighth power switch Q4B is the eighth power switch drive circuit 621B; the fifth target power switch drive circuit corresponding to the tenth power switch Q5B is the tenth power switch drive circuit D5B; and the twelfth power switch... The sixth target power switch driver circuit corresponding to switch Q6B is the twelfth power switch driver circuit D6B; the seventh target power switch driver circuit corresponding to the fourteenth power switch Q7B is the fourteenth power switch driver circuit D7B; the eighth target power switch driver circuit corresponding to the sixteenth power switch Q8B is the sixteenth power switch driver circuit D8B; the ninth target power switch driver circuit corresponding to the eighteenth power switch Q9B is the eighteenth power switch driver circuit D9B; and the tenth target power switch driver circuit corresponding to the twentieth power switch Q10B is the twentieth power switch driver circuit D10B.

[0092] In this circuit, the second power-taking terminal of each power switch driver circuit is connected to the first terminal of the power switch it drives, and can draw power from the first terminal of the corresponding power switch. The first power-taking terminal of the second power switch driver circuit D1B draws power from the first power supply terminal BST1B of the second power supply circuit 402B; the first power-taking terminals of the fourth power switch driver circuit D2B and the fourteenth power switch driver circuit D7B can draw power from the second voltage output terminal VOUTB; the first power-taking terminal of the sixth power switch driver circuit D3B can draw power from the second power supply terminal BST2B of the second power supply circuit 402B; the first power-taking terminal of the eighth power switch driver circuit 621B can draw power from the positive plate C1PB of the second capacitor CF1B; and the tenth power switch driver circuit D5... The first power supply terminal of B can be powered from the third power supply terminal BST3B of the second power supply circuit 402B; the first power supply terminal of the twelfth power switch driver circuit D6B can be powered from the positive plate C2PB of the fourth capacitor CF2B; the first power supply terminal of the sixteenth power switch driver circuit D8B can be powered from the third power supply terminal BST3A of the first power supply circuit 402A; the first power supply terminal of the eighteenth power switch driver circuit D9B can be powered from the positive plate C3PB of the sixth capacitor CF3B; and the first power supply terminal of the twentieth power switch driver circuit D10B can be powered from the first voltage output terminal VOUTA.

[0093] according to Figure 7 As shown, when the cascaded switched capacitor voltage conversion circuit operates in a 4:1 voltage conversion ratio mode, in the first phase, the first power switch Q1A, the seventh power switch Q4A, the ninth power switch Q5A, the thirteenth power switch Q7A, the seventeenth power switch Q9A, the fourth power switch Q2B, the sixth power switch Q3B, the twelfth power switch Q6B, the sixteenth power switch Q8B, and the twentieth power switch Q10B are turned off, while the third power switch Q2A, the fifth power switch Q3A, the eleventh power switch Q6A, the fifteenth power switch Q8A, the nineteenth power switch Q10A, the second power switch Q1B, the eighth power switch Q4B, the tenth power switch Q5B, the fourteenth power switch Q7B, and the eighteenth power switch Q9B are turned on. Correspondingly, the voltage of the positive plate C3PB of the sixth capacitor CF3B is 2×VoutA, then the voltage of the positive plate C1PB of the second capacitor CF1B is 2×(VoutA+VoutB); the voltage of the positive plate C2PB of the fourth capacitor CF2B is VoutB; the voltage of the positive plate C1PA of the first capacitor CF1A is equal to the voltage of the positive plate C2PA of the third capacitor CF2A, both being 2×VoutA; and the voltage of the positive plate C3PA of the fifth capacitor CF3A is VoutB.

[0094] In the second phase, the first power switch Q1A, the seventh power switch Q4A, the ninth power switch Q5A, the thirteenth power switch Q7A, the seventeenth power switch Q9A, the fourth power switch Q2B, the sixth power switch Q3B, the twelfth power switch Q6B, the sixteenth power switch Q8B, and the twentieth power switch Q10B are turned on, while the third power switch Q2A, the fifth power switch Q3A, the eleventh power switch Q6A, the fifteenth power switch Q8A, the nineteenth power switch Q10A, the second power switch Q1B, the eighth power switch Q4B, the tenth power switch Q5B, the fourteenth power switch Q7B, and the eighteenth power switch Q9B are turned off. Correspondingly, the voltage of the positive plate C3PA of the fifth capacitor CF3A is 2×VoutB, then the voltage of the positive plate C1PA of the first capacitor CF1A is 2×(VoutA+VoutB); the voltage of the positive plate C2PA of the third capacitor CF2A is VoutA; the voltage of the positive plate C1PB of the second capacitor CF1B is equal to the voltage of the positive plate C2PB of the fourth capacitor CF2B, both being 2×VoutB; and the voltage of the positive plate C3PB of the sixth capacitor CF3B is VoutA.

[0095] Thus, in the operating mode with a voltage conversion ratio of 4:1, the first output voltage VoutA output from the first voltage output terminal VOUTA and the second output voltage VoutB output from the second voltage output terminal VOUTB can be equal or unequal.

[0096] Based on this, for the first power supply circuit 402A, in the first phase, its first switch M1A, fifth switch M3A, and seventh switch M4A are turned on while the third switch M2A is turned off. At this time, the fifth bootstrap capacitor CBST3A can obtain a voltage of 2×VoutA from the positive plate C2PA of the third capacitor CF2A and supplement this voltage of 2×VoutA to the third power supply terminal BST3A of the first power supply circuit 402A. At this time, the third power supply terminal BST3A can provide a supply voltage of 2×VoutA. The first bootstrap capacitor CBST1A can obtain a voltage of 3×VoutA from the second power supply terminal BST2A of the first power supply circuit 402A and supplement it to the first power supply terminal BST of the first power supply circuit 402A. At 1A, both the second power supply terminal BST2A and the first power supply terminal BST1A can provide a power supply voltage of 3×VoutA. In the second phase, the first switch M1A and the fifth switch M3A are turned off, and the seventh switch M4A and the third switch M2A are turned on. At this time, the third bootstrap capacitor CBST2A can obtain a voltage of 2×VoutA from the third power supply terminal BST3A of the first power supply circuit 402A, and supplement the obtained voltage of 2×VoutA to the second power supply terminal BST2A of the first power supply circuit 402A. At this time, the second power supply terminal BST2A can provide a power supply voltage of 2×VoutA, and the first power supply terminal BST1A can provide a power supply voltage of 2×VoutB+3×VoutA. In this way, through the alternation of the first phase stage and the second phase stage, the first power supply circuit 402A can use the fifth bootstrap capacitor CBST3A, the first bootstrap capacitor CBST1A, and the third bootstrap capacitor CBST2A to supplement the power supply to its first power supply terminal BST1A, second power supply terminal BST2A, and third power supply terminal BST3A, thereby powering the corresponding power switch drive circuits. During the power supplementation process, there is no voltage drop across the corresponding switch transistors, and no additional losses are generated in the entire power supplementation path, effectively reducing additional losses in the drive process and improving the conversion efficiency of the cascaded switched capacitor voltage converter.

[0097] For the second power supply circuit 402B, in the second phase, its second switch M1B, sixth switch M3B, and eighth switch M4B are turned on while the fourth switch M2B is turned off. At this time, the sixth bootstrap capacitor CBST3B can obtain a voltage of 2×VoutB from the positive plate C2PB of the fourth capacitor CF2B and supplement the obtained voltage of 2×VoutB to the third power supply terminal BST3B of the second power supply circuit 402B. At this time, the third power supply terminal BST3B can provide a supply voltage of 2×VoutB. At the same time, the second bootstrap capacitor CBST1B can obtain a voltage of 3×VoutB from the second power supply terminal BST2B of the second power supply circuit 402B and supplement the obtained voltage of 3×VoutB to the first power supply terminal BST1B of the second power supply circuit 402B. At this time, the first power supply terminal BST1B can provide a supply voltage of 3×VoutB. In the first phase, the fourth switch M2B and the eighth switch M4B of the second power supply circuit 402B are turned on, while the second switch M1B and the sixth switch M3B are turned off. At this time, the fourth bootstrap capacitor CBST2B can obtain a voltage of 2×VoutB from the third power supply terminal BST3B of the second power supply circuit 402B, and supplement the second power supply terminal BST2B of the second power supply circuit 402B with this obtained voltage. At this time, the second power supply terminal BST2B can provide a supply voltage of 2×VoutB, and the first power supply terminal BST1A can provide a supply voltage of 2×VoutA+3×VoutB. In this way, through the alternation of the first phase and the second phase, the second power supply circuit 402B can use the sixth bootstrap capacitor CBST3B, the second bootstrap capacitor CBST1B, and the fourth bootstrap capacitor CBST2B to supplement the first power supply terminal BST1B, the second power supply terminal BST2B, and the third power supply terminal BST3B with the power obtained from the fourth capacitor CF2B, thereby supplying power to the corresponding power switch drive circuits. During the power replenishment process, there is no voltage drop across the corresponding switching transistors, and no additional losses are generated in the entire power replenishment path, effectively reducing additional losses in the driving process and improving the conversion efficiency of the cascaded switched capacitor voltage converter.

[0098] Based on this, in the operating mode with a voltage conversion ratio of 4:1, according to the principle of equipotentiality, the first bootstrap capacitor CBST1A supplies power to the first power switch driver circuit D1A, the second bootstrap capacitor CBST1B supplies power to the second power switch driver circuit D1B, the third bootstrap capacitor CBST2A supplies power to the fifth power switch driver circuit D3A, the fourth bootstrap capacitor CBST2B supplies power to the sixth power switch driver circuit D3B, the fifth bootstrap capacitor CBST3A supplies power to the ninth power switch driver circuit D5A and the sixteenth power switch driver circuit D8B, the sixth bootstrap capacitor CBST3B supplies power to the fifteenth power switch driver circuit D8A and the tenth power switch driver circuit D5B, the third capacitor CF2A supplies power to the eleventh power switch driver circuit D6A, and the fourth capacitor... CF2B supplies power to the twelfth power switch driver circuit D6B, the fifth capacitor CF3A supplies power to the seventeenth power switch driver circuit D9A, the sixth capacitor CF3B supplies power to the eighteenth power switch driver circuit D9B, the first capacitor CF1A clamps the power supply to the seventh power switch driver circuit 621A, and the second capacitor CF1B clamps the power supply to the eighth power switch driver circuit 621B. The third power switch driver circuit D2A, the fourth power switch driver circuit D2B, the thirteenth power switch driver circuit D7A, the fourteenth power switch driver circuit D7B, the nineteenth power switch driver circuit D10A, and the twentieth power switch driver circuit D10B can be powered by either the first voltage output terminal VOUTA or the second voltage output terminal VOUTB, depending on their location in the circuit layout.

[0099] according to Figure 7As shown, when the cascaded switched capacitor voltage conversion circuit operates in a 3:1 voltage conversion ratio mode, in the first phase stage, the first power switch Q1A, the seventh power switch Q4A, the ninth power switch Q5A, the thirteenth power switch Q7A, the fourth power switch Q2B, the sixth power switch Q3B, the twelfth power switch Q6B, the seventeenth power switch Q9A, and the eighteenth power switch Q9B are disconnected, while the third power switch Q2A, the fifth power switch Q3A, the eleventh power switch Q6A, the second power switch Q1B, the eighth power switch Q4B, the tenth power switch Q5B, the fourteenth power switch Q7B, the fifteenth power switch Q8A, the sixteenth power switch Q8B, the nineteenth power switch Q10A, and the twentieth power switch Q10B are turned on. Correspondingly, the voltage of the positive plate C1PA of the first capacitor CF1A is equal to the voltage of the positive plate C2PA of the third capacitor CF2A, both being 2×VoutA; the voltage of the positive plate C3PA of the fifth capacitor CF3A is VoutB; the voltage of the positive plate C3PB of the sixth capacitor CF3B is VoutA, then the voltage of the positive plate C1PB of the second capacitor CF1B is VoutA+2×VoutB; and the voltage of the positive plate C2PB of the fourth capacitor CF2B is VoutB.

[0100] In the second phase, the first power switch Q1A, the seventh power switch Q4A, the ninth power switch Q5A, the thirteenth power switch Q7A, the fourth power switch Q2B, the sixth power switch Q3B, the twelfth power switch Q6B, the fifteenth power switch Q8A, the sixteenth power switch Q8B, the nineteenth power switch Q10A, and the twentieth power switch Q10B are turned on, while the third power switch Q2A, the fifth power switch Q3A, the eleventh power switch Q6A, the second power switch Q1B, the eighth power switch Q4B, the tenth power switch Q5B, the fourteenth power switch Q7B, the seventeenth power switch Q9A, and the eighteenth power switch Q9B are turned off. Correspondingly, the voltage of the positive plate C3PA of the fifth capacitor CF3A is VoutB, then the voltage of the positive plate C1PA of the first capacitor CF1A is VoutB + 2 × VoutA; the voltage of the positive plate C2PA of the third capacitor CF2A is VoutA; the voltage of the positive plate C1PB of the second capacitor CF1B is equal to the voltage of the positive plate C2PB of the fourth capacitor CF2B, both being 2 × VoutB; and the voltage of the positive plate C3PB of the sixth capacitor CF3B is VoutA.

[0101] Thus, in the operating mode with a voltage conversion ratio of 3:1, the first output voltage VoutA output from the first voltage output terminal VOUTA and the second output voltage VoutB output from the second voltage output terminal VOUTB need to be equal.

[0102] Based on this, for the first power supply circuit 402A, in the first phase stage, its first switch M1A, fifth switch M3A, and seventh switch M4A are turned on while the third switch M2A is turned off. At this time, the fifth bootstrap capacitor CBST3A can obtain a voltage of 2×VoutA from the positive plate C2PA of the third capacitor CF2A and supplement this voltage of 2×VoutA to the third power supply terminal BST3A of the first power supply circuit 402A. At this time, the third power supply terminal BST3A can provide a power supply voltage of 2×VoutA. The first bootstrap capacitor CBST1A can obtain a voltage of 3×VoutA from the second power supply terminal BST2A of the first power supply circuit 402A and supplement it to the first power supply terminal BST1A of the first power supply circuit 402A. At this time, both the second power supply terminal BST2A and the first power supply terminal BST1A can provide a power supply voltage of 3×VoutA. In the second phase, the first switch M1A and the fifth switch M3A are turned off, while the seventh switch M4A and the third switch M2A are turned on. At this time, the third bootstrap capacitor CBST2A can obtain a voltage of 2×VoutA from the third power supply terminal BST3A of the first power supply circuit 402A, and supplement the obtained voltage of 2×VoutA to the second power supply terminal BST2A of the first power supply circuit 402A. At this time, the second power supply terminal BST2A can provide a power supply voltage of 2×VoutA, and the first power supply terminal BST1A can provide a power supply voltage of VoutB+3×VoutA. For the second power supply circuit 402B, in the second phase, its second switch M1B, sixth switch M3B, and eighth switch M4B are turned on while the fourth switch M2B is turned off. At this time, the sixth bootstrap capacitor CBST3B can obtain a voltage of 2×VoutB from the positive plate C2PB of the fourth capacitor CF2B and supplement the obtained voltage of 2×VoutB to the third power supply terminal BST3B of the second power supply circuit 402B. At this time, the third power supply terminal BST3B can provide a supply voltage of 2×VoutB. At the same time, the second bootstrap capacitor CBST1B can obtain a voltage of 3×VoutB from the second power supply terminal BST2B of the second power supply circuit 402B and supplement the obtained voltage of 3×VoutB to the first power supply terminal BST1B of the second power supply circuit 402B. At this time, the first power supply terminal BST1B can provide a supply voltage of 3×VoutB.In the first phase, the fourth switch M2B and the eighth switch M4B of the second power supply circuit 402B are turned on, while the second switch M1B and the sixth switch M3B are turned off. At this time, the fourth bootstrap capacitor CBST2B can obtain a voltage of 2×VoutB from the third power supply terminal BST3B of the second power supply circuit 402B, and supplement the obtained voltage to the second power supply terminal BST2B of the second power supply circuit 402B. At this time, the second power supply terminal BST2B can provide a supply voltage of 2×VoutB, and the first power supply terminal BST1B can provide a supply voltage of VoutA+3×VoutB.

[0103] Thus, through the alternation of the first and second phase stages, the first power supply circuit 402A can utilize the fifth bootstrap capacitor CBST3A, the first bootstrap capacitor CBST1A, and the third bootstrap capacitor CBST2A to replenish the power from the third capacitor CF2A to its first power supply terminal BST1A, second power supply terminal BST2A, and third power supply terminal BST3A, thereby powering the corresponding power switch drive circuits. Similarly, the second power supply circuit 402B can utilize the sixth bootstrap capacitor CBST3B, the second bootstrap capacitor CBST1B, and the fourth bootstrap capacitor CBST2B to replenish the power from the fourth capacitor CF2B to its first power supply terminal BST1B, second power supply terminal BST2B, and third power supply terminal BST3B, thereby powering the corresponding power switch drive circuits. During the replenishment process, there is no voltage drop across the corresponding switches, and no additional losses are generated in the entire replenishment path, effectively reducing additional losses during the drive process and improving the conversion efficiency of the cascaded switched capacitor voltage converter.

[0104] Based on this, in the working mode with a voltage conversion ratio of 3:1, the same drive power supply scheme as that used when the voltage conversion ratio is 4:1 can be adopted to power the drive circuits of each power switch tube according to the principle of equipotentiality. This will not be elaborated here.

[0105] according to Figure 7As shown, when the cascaded switched capacitor voltage conversion circuit operates in a 2:1 voltage conversion ratio mode, in one embodiment, during the first phase phase, the first power switch Q1A, the seventh power switch Q4A, the eleventh power switch Q6A, the fourth power switch Q2B, the tenth power switch Q5B, the fourteenth power switch Q7B, the fifth power switch Q3A, the sixth power switch Q3B, the fifteenth power switch Q8A, the sixteenth power switch Q8B, the nineteenth power switch Q10A, and the twentieth power switch Q10B are turned on, while the third power switch Q2A, the ninth power switch Q5A, the thirteenth power switch Q7A, the second power switch Q1B, the eighth power switch Q4B, the twelfth power switch Q6B, the seventeenth power switch Q9A, and the eighteenth power switch Q9B are turned off. Correspondingly, the voltage of the negative plate of the third capacitor CF2A is VoutA, and the voltage of the positive plate C2PA of the third capacitor CF2A is 2×VoutA; the voltage of the negative plate of the first capacitor CF1A is VoutB, then the voltage of the positive plate C1PA of the first capacitor CF1A is VoutA+VoutB; the voltage of the negative plate of the fifth capacitor CF3A is 0, and the voltage of the positive plate C3PA of the fifth capacitor CF3A is VoutB; the voltage of the negative plate of the second capacitor CF1B is 0, and the voltage of the positive plate C1PB of the second capacitor CF1B is VoutB; the voltage of the negative plate of the fourth capacitor CF2B is 0, and the voltage of the positive plate C2PB of the fourth capacitor CF2B is VoutB; the voltage of the negative plate of the sixth capacitor CF3B is 0, and the voltage of the positive plate C3PB of the sixth capacitor CF3B is VoutA.

[0106] In the second phase, the first power switch Q1A, the seventh power switch Q4A, the eleventh power switch Q6A, the fourth power switch Q2B, the tenth power switch Q5B, the fourteenth power switch Q7B, the seventeenth power switch Q9A, and the eighteenth power switch Q9B are disconnected, while the third power switch Q2A, the ninth power switch Q5A, the thirteenth power switch Q7A, the second power switch Q1B, the eighth power switch Q4B, the twelfth power switch Q6B, the fifth power switch Q3A, the sixth power switch Q3B, the fifteenth power switch Q8A, the sixteenth power switch Q8B, the nineteenth power switch Q10A, and the twentieth power switch Q10B are turned on. Correspondingly, the voltage of the negative plate of the first capacitor CF1A is 0, and the voltage of the positive plate C1PA of the first capacitor CF1A is VoutA; the voltage of the negative plate of the third capacitor CF2A is 0, and the voltage of the positive plate C2PA of the third capacitor CF2A is VoutA; the voltage of the negative plate of the fifth capacitor CF3A is 0, and the voltage of the positive plate C3PA of the fifth capacitor CF3A is VoutB; the voltage of the negative plate of the second capacitor CF1B is VoutA, and the voltage of the positive plate C1PB of the second capacitor CF1B is VoutA+VoutB; the voltage of the negative plate of the fourth capacitor CF2B is VoutB, and the voltage of the positive plate C2PB of the fourth capacitor CF2B is 2×VoutB; the voltage of the negative plate of the sixth capacitor CF3B is 0, and the voltage of the positive plate C3PB of the sixth capacitor CF3B is VoutA.

[0107] Thus, in the operating mode with a voltage conversion ratio of 2:1, the first output voltage VoutA output from the first voltage output terminal VOUTA and the second output voltage VoutB output from the second voltage output terminal VOUTB need to be equal.

[0108] Based on this, for the first power supply circuit 402A, in the first phase stage, its first switch M1A and seventh switch M4A are turned on, and the third switch M2A and fifth switch M3A are turned off. At this time, the fifth bootstrap capacitor CBST3A can obtain a voltage of 2×VoutA from the positive plate C2PA of the third capacitor CF2A, and supplement this voltage of 2×VoutA to the third power supply terminal BST3A of the first power supply circuit 402A. At this time, the third power supply terminal BST3A can provide a power supply voltage of 2×VoutA. The third bootstrap capacitor CBST2A and the first bootstrap capacitor CBST1A can both obtain a voltage of 2×VoutA from the positive plate C2PA of the third capacitor CF2A, and supplement this voltage of 2×VoutA to the second power supply terminal BST2A and the first power supply terminal BST1A of the first power supply circuit 402A, respectively. At this time, the second power supply terminal BST2A can provide a power supply voltage of 3×VoutA, and the first power supply terminal BST1A can provide a power supply voltage of VoutB+2×VoutA. In the second phase, the third switch M2A, the fifth switch M3A, and the seventh switch M4A are turned on, and the first switch M1A is turned off. At this time, the third bootstrap capacitor CBST2A can obtain a voltage of 2×VoutA from the third power supply terminal BST3A of the first power supply circuit 402A, and supplement the second power supply terminal BST2A of the first power supply circuit 402A with this voltage. Thus, the second power supply terminal BST2A can provide a supply voltage of 2×VoutA. Similarly, the first bootstrap capacitor CBST1A can obtain a voltage of 2×VoutA from the second power supply terminal BST2A of the first power supply circuit 402A, and supplement the first power supply terminal BST1A of the first power supply circuit 402A with this voltage. Thus, the first power supply terminal BST1A can provide a supply voltage of 2×VoutA.

[0109] For the second power supply circuit 402B, in the second phase, its second switch M1B and eighth switch M4B are turned on, while the fourth switch M2B and sixth switch M3B are turned off. At this time, the sixth bootstrap capacitor CBST3B can obtain a voltage of 2×VoutB from the positive plate C2PB of the fourth capacitor CF2B and supplement the obtained voltage of 2×VoutB to the third power supply terminal BST3B of the second power supply circuit 402B. At this time, the third power supply terminal BST3B can provide a supply voltage of 2×VoutB. The second bootstrap capacitor CBST1B and the fourth bootstrap capacitor CBST2B can both obtain a voltage of 2×VoutB from the positive plate C2PB of the fourth capacitor CF2B and supplement the obtained voltage of 2×VoutB to the first power supply terminal BST1B and the second power supply terminal BST2B of the second power supply circuit 402B, respectively. At this time, the first power supply terminal BST1B can provide a supply voltage of VoutA + 2×VoutB, and the second power supply terminal BST2B can provide a supply voltage of 3×VoutB. In the first phase, the fourth switch M2B, the sixth switch M3B, and the eighth switch M4B are turned on, and the second switch M1B is turned off. At this time, the fourth bootstrap capacitor CBST2B can obtain a voltage of 2×VoutB from the third power supply terminal BST3B of the second power supply circuit 402B, and supplement the second power supply terminal BST2B of the second power supply circuit 402B with this voltage of 2×VoutB. At this time, the second power supply terminal BST2B of the second power supply circuit 402B can provide a supply voltage of 2×VoutB. The second bootstrap capacitor CBST1B can also obtain a voltage of 2×VoutB from the second power supply terminal BST2B of the second power supply circuit 402B, and supplement the first power supply terminal BST1B of the second power supply circuit 402B with this voltage of 2×VoutB. At this time, the first power supply terminal BST1B of the second power supply circuit 402B can provide a supply voltage of 2×VoutB.

[0110] Thus, through the alternation of the first and second phase stages, the first power supply circuit 402A can utilize the fifth bootstrap capacitor CBST3A, the first bootstrap capacitor CBST1A, and the third bootstrap capacitor CBST2A to replenish the power from the third capacitor CF2A to its first power supply terminal BST1A, second power supply terminal BST2A, and third power supply terminal BST3A, thereby powering the corresponding power switch drive circuits. Similarly, the second power supply circuit 402B can utilize the sixth bootstrap capacitor CBST3B, the second bootstrap capacitor CBST1B, and the fourth bootstrap capacitor CBST2B to replenish the power from the fourth capacitor CF2B to its first power supply terminal BST1B, second power supply terminal BST2B, and third power supply terminal BST3B, thereby powering the corresponding power switch drive circuits. During the replenishment process, there is no voltage drop across the corresponding switches, and no additional losses are generated in the entire replenishment path, effectively reducing additional losses during the drive process and improving the conversion efficiency of the cascaded switched capacitor voltage converter.

[0111] according to Figure 7 As shown, when the cascaded switched capacitor voltage conversion circuit operates in a 2:1 voltage conversion ratio mode, in another embodiment, during the first phase phase, the first power switch Q1A, the seventh power switch Q4A, the eleventh power switch Q6A, the fourth power switch Q2B, the sixth power switch Q3B, the tenth power switch Q5B, the fourteenth power switch Q7B, the fifteenth power switch Q8A, the sixteenth power switch Q8B, the nineteenth power switch Q10A, and the twentieth power switch Q10B are turned on, while the third power switch Q2A, the fifth power switch Q3A, the ninth power switch Q5A, the thirteenth power switch Q7A, the second power switch Q1B, the eighth power switch Q4B, the twelfth power switch Q6B, the seventeenth power switch Q9A, and the eighteenth power switch Q9B are turned off. Correspondingly, the voltage of the negative plate of the fifth capacitor CF3A is 0, and the voltage of the positive plate C3PA of the fifth capacitor CF3A is VoutB. Therefore, the voltage of the negative plate of the first capacitor CF1A is VoutB, and the voltage of the positive plate C1PA of the first capacitor CF1A is VoutA + VoutB. The voltage of the negative plate of the third capacitor CF2A is VoutA, and the voltage of the positive plate C2PA of the third capacitor CF2A is 2 × VoutA. The voltage of the negative plate of the fourth capacitor CF2B is 0, and the voltage of the positive plate C2PB of the fourth capacitor CF2B is VoutB. Therefore, the voltage of the positive plate C1PB of the second capacitor CF1B is VoutB. The voltage of the negative plate of the sixth capacitor CF3B is 0, and the voltage of the positive plate C3PB of the sixth capacitor CF3B is VoutA.

[0112] In the second phase, the first power switch Q1A, the seventh power switch Q4A, the eleventh power switch Q6A, the fourth power switch Q2B, the sixth power switch Q3B, the tenth power switch Q5B, the fourteenth power switch Q7B, the seventeenth power switch Q9A, and the eighteenth power switch Q9B are disconnected, while the third power switch Q2A, the fifth power switch Q3A, the ninth power switch Q5A, the thirteenth power switch Q7A, the second power switch Q1B, the eighth power switch Q4B, the twelfth power switch Q6B, the fifteenth power switch Q8A, the sixteenth power switch Q8B, the nineteenth power switch Q10A, and the twentieth power switch Q10B are turned on. Correspondingly, the voltage of the negative plate of the third capacitor CF2A is 0, and the voltage of the positive plate C2PA of the third capacitor CF2A is VoutA. Therefore, the voltage of the negative plate of the first capacitor CF1A is 0, and the voltage of the positive plate C1PA of the first capacitor CF1A is VoutA. The voltage of the negative plate of the fifth capacitor CF3A is 0, and the voltage of the positive plate C3PA of the fifth capacitor CF3A is VoutB. The voltage of the negative plate of the sixth capacitor CF3B is 0, and the voltage of the positive plate C3PB of the sixth capacitor CF3B is VoutA. Therefore, the voltage of the negative plate of the second capacitor CF1B is VoutA, and the voltage of the positive plate C1PB of the second capacitor CF1B is VoutA + VoutB. The voltage of the negative plate of the fourth capacitor CF2B is VoutB, and the voltage of the positive plate C2PB of the fourth capacitor CF2B is 2 × VoutB.

[0113] Thus, in the operating mode with a voltage conversion ratio of 2:1, the first output voltage VoutA output from the first voltage output terminal VOUTA and the second output voltage VoutB output from the second voltage output terminal VOUTB can be equal or unequal.

[0114] Based on this, for the first power supply circuit 402A, in the first phase stage, its first switch M1A and seventh switch M4A are turned on, and the third switch M2A and fifth switch M3A are turned off. At this time, the fifth bootstrap capacitor CBST3A can obtain a voltage of 2×VoutA from the positive plate C2PA of the third capacitor CF2A, and supplement this voltage of 2×VoutA to the third power supply terminal BST3A of the first power supply circuit 402A. At this time, the third power supply terminal BST3A can provide a power supply voltage of 2×VoutA; the second power supply terminal BST2A of the first power supply circuit 402A can provide a power supply voltage of 3×VoutA; and the first power supply terminal BST1A can provide a power supply voltage of VoutB+2×VoutA. In the second phase, the third switch M2A, the fifth switch M3A, and the seventh switch M4A are turned on, and the first switch M1A is turned off. At this time, both the third bootstrap capacitor CBST2A and the first bootstrap capacitor CBST1A can obtain a voltage of 2×VoutA from the third power supply terminal BST3A of the first power supply circuit 402A, and supplement the second power supply terminal BST2A and the first power supply terminal BST1A of the first power supply circuit 402A respectively. At this time, the second power supply terminal BST2A of the first power supply circuit 402A can provide a power supply voltage of 2×VoutA, and the first power supply terminal BST1A can provide a power supply voltage of 2×VoutA.

[0115] For the second power supply circuit 402B, in the second phase, its second switch M1B and eighth switch M4B are turned on, while the fourth switch M2B and sixth switch M3B are turned off. At this time, the sixth bootstrap capacitor CBST3B can obtain a voltage of 2×VoutB from the positive plate C2PB of the fourth capacitor CF2B, and supplement the obtained voltage of 2×VoutB to the third power supply terminal BST3B of the second power supply circuit 402B. At this time, the third power supply terminal BST3B can provide a power supply voltage of 2×VoutB. The first power supply terminal BST1B of the second power supply circuit 402B can provide a power supply voltage of VoutA+2×VoutB, and the second power supply terminal BST2B of the second power supply circuit 402B can provide a power supply voltage of 3×VoutB. In the first phase, the fourth switch M2B, the sixth switch M3B, and the eighth switch M4B are turned on, and the second switch M1B is turned off. At this time, the second bootstrap capacitor CBST1B and the fourth bootstrap capacitor CBST2B can obtain a voltage of 2×VoutB from the third power supply terminal BST3B of the second power supply circuit 402B, and supplement the first power supply terminal BST1B and the second power supply terminal BST2B of the second power supply circuit 402B respectively. At this time, the first power supply terminal BST1B of the second power supply circuit 402B can provide a supply voltage of 2×VoutB, and the second power supply terminal BST2B of the second power supply circuit 402B can provide a supply voltage of 2×VoutB.

[0116] Thus, through the alternation of the first and second phase stages, the first power supply circuit 402A can utilize the fifth bootstrap capacitor CBST3A, the first bootstrap capacitor CBST1A, and the third bootstrap capacitor CBST2A to replenish the power from the third capacitor CF2A to its first power supply terminal BST1A, second power supply terminal BST2A, and third power supply terminal BST3A, thereby powering the corresponding power switch drive circuits. Similarly, the second power supply circuit 402B can utilize the sixth bootstrap capacitor CBST3B, the second bootstrap capacitor CBST1B, and the fourth bootstrap capacitor CBST2B to replenish the power from the fourth capacitor CF2B to its first power supply terminal BST1B, second power supply terminal BST2B, and third power supply terminal BST3B, thereby powering the corresponding power switch drive circuits. During the replenishment process, there is no voltage drop across the corresponding switches, and no additional losses are generated in the entire replenishment path, effectively reducing additional losses during the drive process and improving the conversion efficiency of the cascaded switched capacitor voltage converter.

[0117] Based on this, in the working mode with a voltage conversion ratio of 2:1, the same drive power supply scheme as that used when the voltage conversion ratio is 4:1 can be used to power the drive circuits of each power switch tube according to the principle of equipotentiality. This will not be elaborated here.

[0118] Based on the power supply principles of the above-mentioned voltage conversion ratios corresponding to the operating modes, combined with Figure 6 and Figure 7 In this embodiment, the power supply energy of the first target power switch driving circuit D1 corresponding to the first target power switch Q1, the third target power switch driving circuit D3 corresponding to the third target power switch Q3, the fifth target power switch driving circuit D5 corresponding to the fifth target power switch Q5, and the eighth target power switch driving circuit D8 corresponding to the eighth target power switch Q8 is obtained from the second target capacitor CF2 by the third target bootstrap capacitor CBST3, and then transferred to the second target bootstrap capacitor CBST2 and the first target bootstrap capacitor CBST1 through the target power supply circuit 402 with no voltage drop, so as to achieve equipotential power supply. Meanwhile, the sixth target power switch drive circuit D6 corresponding to the sixth target power switch Q6 can be directly powered by the second target capacitor CF2, the ninth target power switch drive circuit D9 corresponding to the ninth target power switch Q9 can be directly powered by the third target capacitor CF3, the second target power switch drive circuit D2 corresponding to the second target power switch Q2, the seventh target power switch drive circuit D7 corresponding to the seventh target power switch Q7 and the tenth target power switch drive circuit D10 corresponding to the tenth target power switch Q10 can be directly powered by the first voltage output terminal VOUTA or the second voltage output terminal VOUTB, and the fourth target power switch drive circuit 621 corresponding to the fourth target power switch Q4 can obtain power from the first target capacitor CF1. In this way, according to the power supply requirements of the target power switch drive circuit corresponding to each target power switch, the power can be directly drawn from the voltage output terminal of the cascaded switched capacitor voltage converter circuit and each target capacitor through the principle of equipotential power supplementation to provide equipotential power supply to the target power switch drive circuit. There is no voltage drop during the power supply process, which greatly reduces the additional losses in the driving process and improves the conversion efficiency of the cascaded switched capacitor voltage converter.

[0119] Meanwhile, for each of the above operating modes, when the first voltage output terminal VOUTA and the second voltage output terminal VOUTB are not equal, the power supply channel can still work normally. There will be no voltage drop on the power supply path that uses the target bootstrap capacitors for power supply. Moreover, the target bootstrap capacitor of the left circuit 71 can supplement the voltage of the first voltage output terminal VOUTA, and the target bootstrap capacitor of the right circuit 72 can supplement the voltage of the second voltage output terminal VOUTB.

[0120] This application also provides a chip that may include the driving circuit as described in any of the above embodiments, or the cascaded switched capacitor voltage converter as described in any of the above embodiments. This chip can achieve the functions of the driving circuit as described in any of the above embodiments and can achieve the beneficial effects achieved by the driving circuit as described in any of the above embodiments, which will not be elaborated further here.

[0121] This application also provides an electronic device that may include a cascaded switched-capacitor voltage converter as described in any of the above embodiments, or a chip as described in the above embodiments. This electronic device can implement the functions of the driving circuit described in any of the above embodiments and achieve the beneficial effects achieved by the driving circuit described in any of the above embodiments, which will not be elaborated further here.

[0122] For example, the electronic devices provided in the embodiments of this application may include at least one of the following, but are not limited to: mobile phones, computers, vehicle terminals, tablet computers, wearable devices, smart home devices, augmented reality (AR) devices, virtual reality (VR) devices, etc.

[0123] In one embodiment of this application, the electronic device may include a processor, an external memory interface, internal memory, a Universal Serial Bus (USB) interface, a charging management module, a power management module, a battery, an antenna, a mobile communication module, a wireless communication module, an audio module, a speaker, a microphone, a headphone jack, a sensor module, buttons, a motor, an indicator, a camera, a display screen, and a Subscriber Identification Module (SIM) card interface, etc. The sensor module may include motion sensors and gyroscopes, etc.

[0124] It is understood that the structures illustrated in the embodiments of this application do not constitute a specific limitation on the electronic device. In other embodiments of this application, the electronic device may include more or fewer components, or combine some components, or split some components, or have different component arrangements. These components may be implemented in hardware, software, or a combination of software and hardware.

[0125] The processor may include one or more processing units, such as, but not limited to, an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and a neural network processing unit (NPU). Different processing units may be independent devices or integrated into one or more processors. The controller can generate operation control signals based on instruction opcodes and timing signals to control instruction fetching and execution. The processor may also include memory for storing instructions and data. In some embodiments, the memory in the processor may be a cache memory. This memory can store instructions or data that the processor has just used or that are used repeatedly. If the processor needs to reuse the instruction or data, it can retrieve it from memory. This avoids repeated accesses, reduces processor waiting time, and thus improves system efficiency.

[0126] The charging management module receives charging signals from the charger. The charger may include a wireless charger or a wired charger. In some wired charging embodiments, the charging management module receives charging input from the wired charger via a USB interface. In some wireless charging embodiments, the charging management module receives wireless charging input via the wireless charging coil of the electronic device. While charging the battery, the charging management module can also supply power to the electronic device via the power management module.

[0127] The power management module connects the battery, the charging management module, and the processor. It receives input from the battery and / or the charging management module to power the processor, internal memory, display screen, camera, and wireless communication module. The power management module can also monitor parameters such as battery capacity, battery cycle count, and battery health status (leakage current, impedance). In some embodiments, the power management module may be located within the processor. In other embodiments, the power management module and the charging management module may be located in the same device.

[0128] Wireless communication functionality in electronic devices can be implemented through antennas, mobile communication modules, wireless communication modules, modem processors, and baseband processors. Antennas are used to transmit and receive electromagnetic wave signals. Mobile communication modules can provide solutions for wireless communication applications in electronic devices, including 2G / 3G / 4G / 5G. In some embodiments, at least some functional modules of the mobile communication module can be housed in the same device as at least some modules of the processor.

[0129] Wireless communication modules can provide solutions for at least one of the following wireless communication technologies used in electronic devices: Wireless Local Area Networks (WLANs) (such as Wireless Fidelity (Wi-Fi) networks), Bluetooth (BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Near Field Communication (NFC), and Infrared (IR), but are not limited to these. A wireless communication module can be one or more devices integrating at least one communication processing module. The wireless communication module receives electromagnetic waves via an antenna, modulates and filters the electromagnetic wave signal, and sends the processed signal to a processor. The wireless communication module can also receive signals to be transmitted from the processor, modulate and amplify them, and then radiate them as electromagnetic waves via the antenna.

[0130] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations thereof that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

Claims

1. A driving circuit, characterized in that, This invention relates to a cascaded switched-capacitor voltage conversion circuit, comprising a first circuit unit and a second circuit unit. The input terminals of the first and second circuit units are connected to serve as the voltage input terminal of the cascaded switched-capacitor voltage conversion circuit. The first output terminal of the first circuit unit is connected to the second output terminal of the second circuit unit to serve as the first voltage output terminal of the cascaded switched-capacitor voltage conversion circuit. The second output terminal of the first circuit unit is connected to the first output terminal of the second circuit unit to serve as the second voltage output terminal of the cascaded switched-capacitor voltage conversion circuit. Each circuit unit includes a first target capacitor, a second target capacitor, a third target capacitor, and a target switch group. The target switch group of the first and second circuit units controls the connection relationship of the first, second, and third target capacitors according to a voltage conversion ratio, forming two alternating phase stages. This allows the cascaded switched-capacitor voltage conversion circuit to convert the input voltage at the voltage input terminal according to the voltage conversion ratio through the alternating operation of the two phase stages. The driving circuit includes a target driving circuit and a target power supply circuit corresponding to each circuit unit. The power-taking terminal of the target power supply circuit is connected to the positive plate of the second target capacitor. The first power supply terminal of the target power supply circuit is connected to the first power-taking terminal of the target driving circuit. The second power supply terminal of the target power supply circuit is connected to the second power-taking terminal of the target driving circuit. The third power supply terminal of the target power supply circuit is connected to the third power-taking terminal of the target driving circuit. The fourth power supply terminal of the target driving circuit is connected to the power-taking terminal of the target power supply circuit. The fifth power supply terminal of the target driving circuit is connected to the positive plate of the first target capacitor. The sixth power supply terminal of the target driving circuit is connected to the positive plate of the third target capacitor. The seventh power supply terminal of the target driving circuit is connected to the first voltage output terminal and / or the second voltage output terminal. The eighth power supply terminal of the target driving circuit is connected to the third power supply terminal of the target power supply circuit corresponding to another circuit unit. The control terminal of the target driving circuit is connected to the controlled terminal of the corresponding target switch group. The target power supply circuit is used to obtain electrical energy from the second target capacitor and replenish the electrical energy to the first power supply terminal, the second power supply terminal and the third power supply terminal of the target power supply circuit according to the principle of equipotential power replenishment and the phase stage of the alternating operation of the cascaded switched capacitor voltage conversion circuit. The target driving circuit is used to control the cascaded switched capacitor voltage conversion circuit to alternately execute the two phase stages based on the power supply voltage of the first power supply terminal, the second power supply terminal and the third power supply terminal of the target power supply circuit, the power supply voltage obtained from the first target capacitor, the second target capacitor and the third target capacitor according to the equipotential compensation principle, and the output voltage obtained from the first voltage output terminal and / or the second voltage output terminal, according to the received driving control signal.

2. The driving circuit according to claim 1, characterized in that, The target power supply circuit is specifically used to: obtain electrical energy from the second target capacitor and supplement the electrical energy to the third power supply terminal of the target power supply circuit when the corresponding circuit unit is working in the first target phase stage, according to the principle of equipotential compensation; When the corresponding circuit unit is operating in the second target phase stage, power is supplied from the third power supply terminal to the second power supply terminal. When the corresponding circuit unit switches from the second target phase stage to the first target phase stage, power is supplied from the second power supply terminal to the first power supply terminal.

3. The driving circuit according to claim 2, characterized in that, The target power supply circuit includes a first target bootstrap capacitor, a second target bootstrap capacitor, a third target bootstrap capacitor, a first target switch transistor, a second target switch transistor, a third target switch transistor, and a fourth target switch transistor; The positive plate of the first target bootstrap capacitor is connected to the first terminal of the third target switch transistor to serve as the first power supply terminal of the target power supply circuit. The negative plate of the first target bootstrap capacitor serves as the first connection terminal of the target power supply circuit and is connected to the positive plate of the first target capacitor. The positive plate of the second target bootstrap capacitor is connected to the second terminal of the third target switch transistor and the first terminal of the second target switch transistor to serve as the second power supply terminal of the target power supply circuit. The negative plate of the second target bootstrap capacitor is connected to the first terminal of the fourth target switch transistor to serve as the power take-off terminal of the target power supply circuit. The second terminal of the fourth target switch transistor is connected to the second terminal of the first target switch transistor. The first terminal of the first target switch transistor, the second terminal of the second target switch transistor, and the positive plate of the third target bootstrap capacitor serve as the third power supply terminal of the target power supply circuit. The negative plate of the third target bootstrap capacitor corresponding to the first circuit unit serves as the second connection terminal of the target power supply circuit and is connected to the first voltage output terminal. The negative plate of the third target bootstrap capacitor corresponding to the second circuit unit serves as the second connection terminal of the target power supply circuit and is connected to the second voltage output terminal. When the voltage conversion ratio is 4:1 or 3:1, the first target switch and the third target switch are turned on when the corresponding circuit unit is operating in the first target phase stage, and turned off when the corresponding circuit unit is operating in the second target phase stage. The second target switch is turned off when the corresponding circuit unit is operating in the first target phase stage, and turned on when the corresponding circuit unit is operating in the second target phase stage; the fourth target switch remains on in both target phase stages. When the voltage conversion ratio is 2:1, the first target switch is turned on when the corresponding circuit unit is operating in the first target phase stage, and turned off when the corresponding circuit unit is operating in the second target phase stage. The second target switch and the third target switch are simultaneously turned off when the corresponding circuit unit is operating in the first target phase stage, and simultaneously turned on when the corresponding circuit unit is operating in the second target phase stage. When the first target switch is turned on, the third target bootstrap capacitor obtains electrical energy from the second target capacitor and replenishes the obtained electrical energy to the third power supply terminal; when the second target switch is turned on, the second target bootstrap capacitor obtains electrical energy from the third power supply terminal and replenishes the obtained electrical energy to the second power supply terminal; when the third target switch is turned on, the first target bootstrap capacitor obtains electrical energy from the second power supply terminal and replenishes the obtained electrical energy to the first power supply terminal.

4. The driving circuit according to any one of claims 1 to 3, characterized in that, Each circuit unit corresponds to a target switch group including a first target switch group, a second target switch group, and a third target switch group; the first terminal of the first target switch group serves as the input terminal of the circuit unit, the second terminal of the first target switch group is connected to the positive plate of the first target capacitor, the third terminal of the first target switch group is connected to the positive plate of the second target capacitor, and the fourth terminal of the first target switch group is connected to the negative plate of the second target capacitor; the first terminal of the second target switch group is connected to the negative plate of the first target capacitor, the second terminal of the second target switch group is connected to the first terminal of the third target switch group and the positive plate of the third target capacitor, and the second terminal of the third target switch group is connected to the negative plate of the third target capacitor; the output terminal of the first target switch group of the first circuit unit serves as the first output terminal of the first circuit unit, and the output terminal of the third target switch group of the first circuit unit serves as the second output terminal of the first circuit unit; the output terminal of the third target switch group of the second circuit unit serves as the first output terminal of the second circuit unit, and the output terminal of the first target switch group of the second circuit unit serves as the second output terminal of the second circuit unit; The target driving circuit includes a first target sub-driving circuit corresponding to the first target switch group, a second target sub-driving circuit corresponding to the second target switch group, and a third target sub-driving circuit corresponding to the third target switch group; The control terminal of the first target sub-driving circuit is used to connect to the controlled terminal of the first target switch group. The first power-taking terminal of the first target sub-driving circuit is connected to the first power-supply terminal of the target power supply circuit. The second power-taking terminal of the first target sub-driving circuit is connected to the second power-supply terminal of the target power supply circuit. The third power-taking terminal of the first target sub-driving circuit is connected to the third power-supply terminal of the target power supply circuit. The fourth power-taking terminal of the first target sub-driving circuit is connected to the power-supply terminal of the target power supply circuit. The control terminal of the second target sub-driving circuit is used to connect to the controlled terminal of the second target switch group. The first power-taking terminal of the second target sub-driving circuit is connected to the first power-supply terminal of the target drive circuit. The fifth power-taking terminal is used to connect to the positive plate of the first target capacitor. The second power-taking terminal of the second target sub-driving circuit is connected to the fifth power-taking terminal of the first target sub-driving circuit and then serves as the first sub-terminal of the seventh power-taking terminal of the target driving circuit, which is used to connect to the first voltage output terminal. The control terminal of the third target sub-driving circuit is used to connect to the controlled terminal of the third target switch group. The first power-taking terminal of the third target sub-driving circuit serves as the eighth power-taking terminal of the target driving circuit and is connected to the third power supply terminal of the target power supply circuit corresponding to another circuit unit. The second power-taking terminal of the third target sub-driving circuit serves as the sixth power-taking terminal of the target driving circuit and is used to connect to the positive plate of the third target capacitor. The third power-taking terminal of the third target sub-driving circuit serves as the second sub-terminal of the seventh power-taking terminal of the target driving circuit and is used to connect to the second voltage output terminal. The first target sub-driving circuit is used to control the switching state of the first target switch group according to the driving control signal based on the supply voltage obtained from the second target capacitor, the first output voltage obtained from the first voltage output terminal, and the supply voltage provided by the first power supply terminal, the second power supply terminal and the third power supply terminal of the target power supply circuit; The second target sub-driving circuit is used to control the switching state of the second target switch group according to the driving control signal based on the supply voltage obtained from the first target capacitor and the first output voltage obtained from the first voltage output terminal; The third target sub-driving circuit is used to control the switching state of the third target switch group according to the driving control signal based on the power supply voltage obtained from the third power supply terminal of the target power supply circuit corresponding to another circuit unit, the power supply voltage obtained from the third target capacitor, and the second output voltage obtained from the second voltage output terminal.

5. The driving circuit according to claim 4, characterized in that, The first target switch group includes a first target power switch, a third target power switch, a fifth target power switch, a sixth target power switch, and a seventh target power switch. The second end of the first target power switch serves as the first end of the first target switch group. The first end of the first target power switch is connected to the second end of the third target power switch, which then serves as the second end of the first target switch group and is connected to the positive plate of the first target capacitor. The first end of the third target power switch is connected to the second end of the fifth target power switch, which then serves as the third end of the first target switch group and is connected to the positive plate of the second target capacitor. The first end of the fifth target power switch is connected to the second end of the sixth target power switch, which then serves as the output end of the first target switch group. The first end of the sixth target power switch and the second end of the seventh target power switch are connected to the fourth end of the first target switch group and are connected to the negative plate of the second target capacitor. The first end of the seventh target power switch is connected to ground. The first target sub-driving circuit includes a first target power switch driving circuit corresponding to the first target power switch, a third target power switch driving circuit corresponding to the third target power switch, a fifth target power switch driving circuit corresponding to the fifth target power switch, a sixth target power switch driving circuit corresponding to the sixth target power switch, and a seventh target power switch driving circuit corresponding to the seventh target power switch. The driving terminal of the first target power switch driving circuit serves as the first control terminal of the first target sub-driving circuit for connection to the controlled terminal of the first target power switch. A power-taking terminal is connected to the first power-taking terminal of the first target sub-driving circuit and the first power-supply terminal of the target power supply circuit. A second power-taking terminal of the first target power switch driving circuit is connected to the first connection terminal of the target power supply circuit. The driving terminal of the third target power switch driving circuit serves as the second control terminal of the first target sub-driving circuit and is connected to the controlled terminal of the third target power switch. The first power-taking terminal of the third target power switch driving circuit serves as the second power-taking terminal of the first target sub-driving circuit and is connected to the second power-supply terminal of the target power supply circuit. The power supply terminals are connected as follows: the driving terminal of the fifth target power switch driving circuit serves as the third control terminal of the first target sub-driving circuit and is connected to the controlled terminal of the fifth target power switch; the first power supply terminal of the fifth target power switch driving circuit serves as the third power supply terminal of the first target sub-driving circuit and is connected to the third power supply terminal of the target power supply circuit; the second power supply terminal of the fifth target power switch driving circuit is connected to the output terminal of the first target switch group; the driving terminal of the sixth target power switch driving circuit serves as the fourth control terminal of the first target sub-driving circuit and is connected to the controlled terminal of the sixth target power switch. The first power-taking terminal of the power switch driving circuit is connected to the power-taking terminal of the target power supply circuit as the fourth power-taking terminal of the first target sub-driving circuit. The second power-taking terminal of the sixth target power switch driving circuit is used to connect to the negative plate of the second target capacitor. The driving terminal of the seventh target power switch driving circuit is connected to the controlled terminal of the seventh target power switch as the fifth control terminal of the first target sub-driving circuit. The first power-taking terminal of the seventh target power switch driving circuit is connected to the first voltage output terminal as the fifth power-taking terminal of the first target sub-driving circuit. The second power-taking terminal of the seventh target power switch driving circuit is connected to ground.

6. The driving circuit according to claim 5, characterized in that, When the cascaded switched capacitor voltage conversion circuit operates in the 2:1 voltage conversion ratio mode and the first target sub-driving circuit controls the third target power switch to remain on in both phase phases, the first output voltage output from the first voltage output terminal and the second output voltage output from the second voltage output terminal are equal; when the cascaded switched capacitor voltage conversion circuit operates in the 2:1 voltage conversion ratio mode and the first target sub-driving circuit controls the third target power switch to alternately conduct in the two phase phases, the first output voltage output from the first voltage output terminal and the second output voltage output from the second voltage output terminal are not equal.

7. The driving circuit according to claim 4, characterized in that, The second target switch group includes a second target power switch and a fourth target power switch; the first end of the second target power switch is connected to ground, the second end of the second target power switch and the first end of the fourth target power switch are connected together to form the first end of the second target switch group and are connected to the negative plate of the first target capacitor, and the second end of the fourth target power switch is connected to form the second end of the second target switch group and are connected to the positive plate of the third target capacitor. The second target sub-driving circuit includes a second target power switch driving circuit corresponding to the second target power switch and a fourth target power switch driving circuit corresponding to the fourth target power switch. The driving terminal of the second target power switch driving circuit serves as the first control terminal of the second target sub-driving circuit and is connected to the controlled terminal of the second target power switch. The first power-taking terminal of the second target power switch driving circuit serves as the second power-taking terminal of the second target sub-driving circuit and is connected to the first voltage output terminal. The second power-taking terminal of the second target power switch driving circuit is connected to ground. The driving terminal of the fourth target power switch driving circuit serves as the second control terminal of the second target sub-driving circuit and is connected to the controlled terminal of the fourth target power switch. The first power-taking terminal of the fourth target power switch driving circuit serves as the first power-taking terminal of the second target sub-driving circuit and is connected to the positive plate of the first target capacitor. The second power-taking terminal of the fourth target power switch driving circuit is connected to the negative plate of the first target capacitor.

8. The driving circuit according to claim 7, characterized in that, The driving circuit also includes a boost circuit, the input terminal of which is connected to the voltage input terminal of the cascaded switched capacitor voltage conversion circuit, and the output terminal of which is used to output the boosted power supply voltage. The fourth target power switch driving circuit includes a fourth target driving unit, a target driving control switch, a target Zener diode, and a fourth target capacitor. The drain of the target driving control switch serves as the first power-taking terminal of the fourth target power switch driving circuit and is connected to the positive plate of the first target capacitor. The gate of the target driving control switch is connected to the negative terminal of the target Zener diode and the positive plate of the fourth target capacitor, and then serves as the third power-taking terminal of the fourth target power switch driving circuit and is connected to the output terminal of the boost circuit. The source of the target driving control switch is connected to the first power-taking terminal of the fourth target driving unit. The second power-taking terminal of the fourth target driving unit, the positive terminal of the target Zener diode, and the negative plate of the fourth target capacitor are connected to serve as the second power-taking terminal of the fourth target power switch driving circuit and are connected to the negative plate of the first target capacitor.

9. The driving circuit according to claim 4, characterized in that, The third target switch group includes an eighth target power switch, a ninth target power switch, and a tenth target power switch; the second end of the eighth target power switch serves as the first end of the third target switch group and is connected to the positive plate of the third target capacitor; the first end of the eighth target power switch is connected to the second end of the ninth target power switch and serves as the output end of the third target switch group; the first end of the ninth target power switch is connected to the second end of the tenth target power switch and serves as the second end of the third target switch group and is connected to the negative plate of the third target capacitor; and the first end of the tenth target power switch is connected to ground. The third target sub-driving circuit includes an eighth target power switch driving circuit corresponding to the eighth target power switch, a ninth target power switch driving circuit corresponding to the ninth target power switch, and a tenth target power switch driving circuit corresponding to the tenth target power switch. The driving terminal of the eighth target power switch driving circuit serves as the first control terminal of the third target sub-driving circuit and is connected to the controlled terminal of the eighth target power switch. The first power-taking terminal of the eighth target power switch driving circuit serves as the first power-taking terminal of the third target sub-driving circuit and is connected to the third power-supply terminal of the target power supply circuit corresponding to another circuit unit. The second power-taking terminal of the eighth target power switch driving circuit is connected to the output terminal of the third target switch group. The driving terminal of the ninth target power switch driving circuit... The driving terminal of the tenth target power switch circuit serves as the second control terminal of the third target sub-driving circuit and is connected to the controlled terminal of the ninth target power switch. The first power-taking terminal of the ninth target power switch circuit serves as the second power-taking terminal of the third target sub-driving circuit and is connected to the positive plate of the third target capacitor. The second power-taking terminal of the ninth target power switch circuit is also connected to the negative plate of the third target capacitor. The driving terminal of the tenth target power switch circuit serves as the third control terminal of the third target sub-driving circuit and is connected to the controlled terminal of the tenth target power switch. The first power-taking terminal of the tenth target power switch circuit serves as the third power-taking terminal of the third target sub-driving circuit and is connected to the second voltage output terminal. The second power-taking terminal of the tenth target power switch circuit is connected to ground.

10. The driving circuit according to claim 9, characterized in that, When the cascaded switched capacitor voltage conversion circuit operates in a working mode with a voltage conversion ratio of 2:1 or 3:1, the third target sub-driving circuit controls the ninth target power switch to remain off in both phase phases, and controls the eighth and tenth target power switches to remain on in both phase phases.

11. The driving circuit according to any one of claims 1 to 3, characterized in that, When the cascaded switched capacitor voltage conversion circuit operates in the working mode with a voltage conversion ratio of 4:1, the first output voltage output by the first voltage output terminal and the second output voltage output by the second voltage output terminal are equal or unequal; when the cascaded switched capacitor voltage conversion circuit operates in the working mode with a voltage conversion ratio of 3:1, the first output voltage output by the first voltage output terminal and the second output voltage output by the second voltage output terminal are equal.

12. A cascaded switched capacitor voltage converter, characterized in that, Includes a cascaded switched capacitor voltage conversion circuit and a drive circuit as described in any one of claims 1 to 11; The cascaded switched capacitor voltage conversion circuit includes a first circuit unit and a second circuit unit. The input terminals of the first and second circuit units are connected to serve as the voltage input terminal of the cascaded switched capacitor voltage conversion circuit. The first output terminal of the first circuit unit is connected to the first output terminal of the second circuit unit to serve as the first voltage output terminal of the cascaded switched capacitor voltage conversion circuit. The second output terminal of the first circuit unit is connected to the second output terminal of the second circuit unit to serve as the second voltage output terminal of the cascaded switched capacitor voltage conversion circuit. Each circuit unit includes a first target capacitor, a second target capacitor, a third target capacitor, and a target switch group. The target switch group of the first and second circuit units controls the connection relationship of the first, second, and third target capacitors according to the voltage conversion ratio, forming two alternating phase stages. This allows the cascaded switched capacitor voltage conversion circuit to convert the input voltage at the voltage input terminal according to the voltage conversion ratio through the alternating operation of the two phase stages.

13. A chip, characterized in that, It includes the drive circuit as described in any one of claims 1 to 11, or the cascaded switched capacitor voltage converter as described in claim 12.

14. An electronic device, characterized in that, It includes the cascaded switched capacitor voltage converter as described in claim 12, or the chip as described in claim 13.

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