CN115800731A

CN115800731A - Switched capacitor voltage conversion circuit and switched capacitor voltage converter

Info

Publication number: CN115800731A
Application number: CN202211467158.0A
Authority: CN
Inventors: 周翔
Original assignee: Shanghai Southchip Semiconductor Technology Co Ltd
Current assignee: Shanghai Southchip Semiconductor Technology Co Ltd
Priority date: 2022-11-22
Filing date: 2022-11-22
Publication date: 2023-03-14

Abstract

The embodiment of the application provides a switched capacitor voltage conversion circuit and a switched capacitor voltage converter. The switched capacitor voltage conversion circuit includes: the first branch circuit, the second branch circuit and the switch branch circuit; the first end of the first branch circuit and the first end of the second branch circuit are both electrically connected with the input end of the switched capacitor voltage conversion circuit, the input end of the switched capacitor voltage conversion circuit is connected with input voltage, the second end of the first branch circuit and the second end of the second branch circuit are both electrically connected with the first output end of the switched capacitor voltage conversion circuit, the third end of the first branch circuit is electrically connected with the first end of the switched branch circuit, the third end of the second branch circuit is electrically connected with the second end of the switched branch circuit, and the fourth end of the first branch circuit and the fourth end of the second branch circuit are both grounded; first branch road and second branch road all include a plurality of switch tubes, and the switch branch road can reduce the voltage difference at the both ends before every switch tube switches on. The switched capacitor voltage conversion circuit can reduce the voltage difference of two ends of each switching tube before being conducted, thereby reducing the circuit loss and improving the conversion efficiency of the circuit.

Description

Switched capacitor voltage conversion circuit and switched capacitor voltage converter

Technical Field

The embodiment of the application relates to the technical field of voltage conversion, in particular to a switched capacitor voltage conversion circuit and a switched capacitor voltage converter.

Background

A switched capacitor voltage converter, which is a direct current-direct current (DC-DC) converter using a capacitor to store energy and can convert an input DC voltage into another DC voltage for output, is widely used in various power management applications as a basic power conversion structure. For example, as shown in fig. 1, a conventional Dickson-type switched capacitor voltage converting circuit with two parallel lines 2.

The conversion efficiency is an important index of the switched capacitor voltage conversion circuit, and determines the loading capacity and the temperature rise condition of the switched capacitor voltage conversion circuit. The higher the conversion efficiency is, the larger the loading capacity of the switched capacitor voltage conversion circuit is, and the lower the temperature rise is. The loss of the switch capacitor voltage conversion circuit comprises conduction loss of each switch tube in the circuit, switching loss when each switch tube is switched and driving loss of each switch tube. The key to improving the conversion efficiency is to reduce the loss of the switched capacitor voltage conversion circuit.

However, when the conventional switched capacitor voltage conversion circuit is used, the voltage difference between two ends of each switching tube is large during switching, so that the loss of the switched capacitor voltage conversion circuit is large, and the conversion efficiency is low.

Disclosure of Invention

In view of the foregoing problems, embodiments of the present application provide a switched capacitor voltage converting circuit and a switched capacitor voltage converter, which can reduce a voltage difference between two ends of each switching tube before being turned on, and can reduce a switching loss of each switching tube, so as to reduce a loss of the switched capacitor voltage converting circuit and improve a conversion efficiency of the switched capacitor voltage converting circuit.

In a first aspect, an embodiment of the present application provides a switched capacitor voltage conversion circuit, including: the circuit comprises a first branch circuit, a second branch circuit and a switch branch circuit; the first end of the first branch circuit and the first end of the second branch circuit are electrically connected with the input end of the switched capacitor voltage conversion circuit, the input end of the switched capacitor voltage conversion circuit is connected with input voltage, the second end of the first branch circuit and the second end of the second branch circuit are electrically connected with the first output end of the switched capacitor voltage conversion circuit, the third end of the first branch circuit is electrically connected with the first end of the switched capacitor voltage conversion circuit, the third end of the second branch circuit is electrically connected with the second end of the switched capacitor voltage conversion circuit, and the fourth end of the first branch circuit and the fourth end of the second branch circuit are both grounded.

The first branch circuit and the second branch circuit respectively comprise a plurality of switching tubes, and the switching branch circuits are used for conducting the third end of the first branch circuit and the third end of the second branch circuit and reducing the voltage difference of the two ends of each switching tube before conducting; the switch capacitor voltage conversion circuit is used for converting an input voltage into a first output voltage, the first output voltage is 1/N of the input voltage, and N is an integer greater than or equal to 2.

In a second aspect, an embodiment of the present application provides a switched capacitor voltage converter, including: the switched capacitor voltage conversion circuit provided by the first aspect.

In the technical scheme of the embodiment of the application, the switched capacitor voltage conversion circuit comprises a first branch circuit, a second branch circuit and a switch branch circuit; the first end of the first branch circuit and the first end of the second branch circuit are both electrically connected with the input end of the switched capacitor voltage conversion circuit, the input end of the switched capacitor voltage conversion circuit is connected with input voltage, the second end of the first branch circuit and the second end of the second branch circuit are both electrically connected with the first output end of the switched capacitor voltage conversion circuit, the third end of the first branch circuit is electrically connected with the first end of the switched branch circuit, the third end of the second branch circuit is electrically connected with the second end of the switched branch circuit, and the fourth end of the first branch circuit and the fourth end of the second branch circuit are both grounded; the first branch circuit and the second branch circuit respectively comprise a plurality of switching tubes, and the switching branch circuits are used for conducting the third end of the first branch circuit and the third end of the second branch circuit and reducing the voltage difference of the two ends of each switching tube before conducting; the switch capacitor voltage conversion circuit is used for converting input voltage into first output voltage, the first output voltage is 1/N of the input voltage, N is an integer larger than or equal to 2, therefore, partial charges of the first branch can be transferred to the second branch or partial charges of the second branch can be transferred to the second branch by conducting the third end of the first branch and the third end of the second branch, the voltage of the third end of the first branch or the voltage of the third end of the second branch can be reduced, the voltage difference of the two ends of each switch tube before conducting can be reduced, the switching loss of each switch tube is reduced, the loss of the switch capacitor voltage conversion circuit can be reduced, and the conversion efficiency of the switch capacitor voltage conversion circuit is improved.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and in order that the technical means of the embodiments of the present application can be clearly understood, the embodiments of the present application are specifically described below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a switched capacitor voltage conversion circuit of a two-way branch 2 provided in the prior art;

fig. 2 is a schematic structural diagram of a switched capacitor voltage converting circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of another switched capacitor voltage converting circuit according to an embodiment of the present disclosure;

fig. 4 is a timing diagram illustrating an operation of a switched capacitor voltage converting circuit according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a switched capacitor voltage conversion circuit in a first operating state according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a switched capacitor voltage converting circuit in a second operating state according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a switched capacitor voltage converting circuit in a third operating state according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a switched capacitor voltage converting circuit in a fourth operating state according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a switching branch according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of another switched capacitor voltage converting circuit according to an embodiment of the present disclosure;

fig. 11 is an operation timing diagram of another switched capacitor voltage converting circuit according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of another switched capacitor voltage converting circuit according to an embodiment of the present disclosure;

fig. 13 is a timing diagram illustrating an operation of another switched capacitor voltage converting circuit according to an embodiment of the present disclosure;

fig. 14 is a schematic structural diagram of another switched capacitor voltage converting circuit according to an embodiment of the present disclosure;

fig. 15 is an operation timing diagram of another switched capacitor voltage converting circuit according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of another switched capacitor voltage conversion circuit according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the description and claims of this application and the description of the figures are intended to cover non-exclusive inclusions.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Furthermore, the terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, either explicitly or implicitly, including one or more of the features.

In the description of the present application, unless specifically stated or limited otherwise, the terms "connected" or "coupled" are to be construed broadly, e.g., "connected" or "coupled" of circuit structures may mean, in addition to physical coupling, electrical or signal coupling, e.g., direct coupling, i.e., physical coupling, indirect coupling via at least one element therebetween, as long as electrical communication is achieved, or communication between two elements; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

Fig. 2 is a schematic structural diagram of a switched capacitor voltage converting circuit according to an embodiment of the present application, and as shown in fig. 2, the switched capacitor voltage converting circuit 100 includes: a first branch 110, a second branch 120, and a switching branch 130.

The first end of the first branch circuit 110 and the first end of the second branch circuit 120 are both electrically connected to the input terminal IN of the switched capacitor voltage conversion circuit 100, the input terminal IN is connected to the input voltage Vin, the second end of the first branch circuit 110 and the second end of the second branch circuit 120 are both electrically connected to the first output terminal OUT1 of the switched capacitor voltage conversion circuit 100, the third end of the first branch circuit 110 is electrically connected to the first end of the switched branch circuit 130, the third end of the second branch circuit 120 is electrically connected to the second end of the switched branch circuit 130, and the fourth end of the first branch circuit 110 and the fourth end of the second branch circuit 120 are both grounded.

The first branch circuit 110 and the second branch circuit 120 each include a plurality of switching tubes, and the switching branch circuit 130 is configured to conduct the third terminal of the first branch circuit 110 and the third terminal of the second branch circuit 120, so as to reduce a voltage difference between the two terminals before each switching tube is conducted. The switch-capacitor voltage conversion circuit 100 is configured to convert an input voltage Vin into a first output voltage Vout1, where the first output voltage Vout1 is 1/N of the input voltage Vin, and N is an integer greater than or equal to 2.

For example, as shown in fig. 2, the first branch 110 includes four switching tubes, namely a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4, and the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 all have parasitic capacitances; the first branch 110 further comprises a first capacitor CF1. The second branch 120 includes four switching tubes, which are a fifth switching tube Q5, a sixth switching tube Q6, a seventh switching tube Q7 and an eighth switching tube Q8, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 all have parasitic capacitors, and the second branch 120 further includes a second capacitor CF2.

The first end of the first switch tube Q1 and the first end of the fifth switch tube Q5 are both electrically connected to the input terminal IN, the second end of the first switch tube Q1 is electrically connected to the second end of the second switch tube Q2 and the first polar plate of the first capacitor CF1, and the second end of the fifth switch tube Q5 is electrically connected to the second end of the sixth switch tube Q6 and the first polar plate of the second capacitor CF2. The second end of the second switch tube Q2, the second end of the sixth switch tube Q6, the first end of the third switch tube Q3 and the first end of the seventh switch tube Q7 are all electrically connected to the first output end OUT1, the second end of the third switch tube Q3 is electrically connected to the second pole plate of the first capacitor CF1 and the first end of the fourth switch tube Q4, the second end of the seventh switch tube Q7 is electrically connected to the second pole plate of the second capacitor CF2 and the first end of the eighth switch tube Q8, and the second end of the fourth switch tube Q4 and the second end of the eighth switch tube Q8 are all grounded.

The first end of the first switch tube Q1 is the first end of the first branch circuit 110, the first end of the fifth switch tube Q5 is the second end of the second branch circuit 110, the first end of the first switch tube Q1 and the first end of the fifth switch tube Q5 are both electrically connected to the input terminal IN, and then the first end of the first branch circuit 110 and the first end of the second branch circuit 120 are both electrically connected to the input terminal IN. The second end of the second switch tube Q2 is the second end of the first branch circuit 110, the second end of the sixth switch tube Q6 is the second end of the second branch circuit 120, the second end of the second switch tube Q2 and the second end of the sixth switch tube Q6 are both electrically connected to the first output end OUT1, and then the second end of the first branch circuit 110 and the second end of the second branch circuit 120 are both electrically connected to the first output end OUT1. The input terminal IN is grounded through the input capacitor Cin, the first output terminal OUT1 is grounded through the first output capacitor Cout1, and the first output terminal OUT1 is also grounded through the load resistor Rout. The second end of the fourth switching tube Q4 is the fourth end of the first branch circuit 110, the second end of the eighth switching tube Q8 is the fourth end of the second branch circuit 120, the second end of the fourth switching tube Q4 and the second end of the eighth switching tube Q8 are both grounded, and then the fourth end of the first branch circuit 110 and the fourth end of the second branch circuit 120 are both grounded.

Continuing to refer to fig. 2, for example, the second plate of the first capacitor CF1 is the third end of the first branch 110, the second plate of the second capacitor CF2 is the third end of the second branch 120, the second plate of the first capacitor CF1 is electrically connected to the first end of the switching branch 130, and the second plate of the second capacitor CF2 is electrically connected to the second end of the switching branch 130. The connection point of the second polar plate of the first capacitor CF1, the second end of the third switching tube Q3 and the first end of the fourth switching tube Q4 is used as a first connection point A1, the connection point of the second polar plate of the second capacitor CF2, the second end of the seventh switching tube Q7 and the first end of the eighth switching tube Q8 is used as a second connection point B1, and the switching branch 130 can conduct the third end of the first branch 110 and the third end of the second branch 120 in a conducting state, so that the first connection point A1 and the second connection point B1 can be conducted.

After the first connection point A1 and the second connection point B1 are turned on, part of the charge of the first branch circuit 110 may be transferred to the second branch circuit 120 through the first connection point A1 and the second connection point B1, so that the voltage of the first connection point A1 can be reduced; part of the charge of the second branch 120 can be transferred to the first branch 110 through the second connection point B1 and the first connection point A1, and the voltage of the second connection point B1 can be reduced. With the decrease of the voltage of the first connection point A1 or the decrease of the voltage of the second connection point B1, the voltage difference between the two ends of each switching tube before being conducted is correspondingly decreased, so that the switching loss of each switching tube can be reduced.

In another implementation manner, fig. 3 is a schematic structural diagram of another switched capacitor voltage converting circuit provided in the embodiment of the present application, as shown in fig. 3, a first plate of a first capacitor CF1 is a third end of the first branch circuit 110, a first plate of a second capacitor CF2 is a third end of the second branch circuit 120, and then the first plate of the first capacitor CF1 is electrically connected to the first end of the switched branch circuit 130, and the first plate of the second capacitor CF2 is electrically connected to the second end of the switched branch circuit 130.

With reference to fig. 2, when the first, third, sixth and eighth switching tubes Q1, Q3, Q6 and Q8 are all turned on, and the second, fourth, fifth and seventh switching tubes Q2, Q4, Q5 and Q7 are all turned off, the switched-capacitor voltage converting circuit 100 may convert the input voltage Vin into Vin/2 and output the Vin/2 as the first output voltage Vout 1.

It should be noted that the embodiment of the present application is only an example, and the switched-capacitor voltage conversion circuit 100 may convert the input voltage Vin into 1/2 of the input voltage Vin, that is, vout1= Vin/2. In other implementation manners, the switched-capacitor voltage conversion circuit 100 may further convert the input voltage Vin into 1/3, 1/4.. 1/N of the input voltage Vin, where N is any integer greater than 2.

In this embodiment of the application, the switched capacitor voltage converting circuit includes a first branch circuit, a second branch circuit and a switch branch circuit, a first end of the first branch circuit and a first end of the second branch circuit are both electrically connected to an input end of the switched capacitor voltage converting circuit, the input end is connected to an input voltage, a second end of the first branch circuit and a second end of the second branch circuit are both electrically connected to a first output end of the switched capacitor voltage converting circuit, a third end of the first branch circuit is electrically connected to the first end of the switch branch circuit, a third end of the second branch circuit is electrically connected to the second end of the switch branch circuit, a fourth end of the first branch circuit and a fourth end of the second branch circuit are both grounded, and the first branch circuit and the second branch circuit both include a plurality of switching tubes; the third end of the first branch circuit and the third end of the second branch circuit can be conducted through the switch branch circuits, and the voltage difference of the two ends of each switch tube before conduction is reduced; the switch capacitor voltage conversion circuit can convert input voltage into first output voltage, the first output voltage is 1/N of the input voltage, N is an integer greater than or equal to 2, therefore, partial charges of the first branch can be transferred to the second branch or partial charges of the second branch can be transferred to the second branch by conducting the third end of the first branch and the third end of the second branch, and the voltage of the third end of the first branch or the voltage of the third end of the second branch can be reduced.

In some embodiments, fig. 4 is an operation timing diagram of a switched capacitor voltage conversion circuit provided in an embodiment of the present application, and as shown in fig. 4, one operation cycle of the switched capacitor voltage conversion circuit 100 includes a first operation state (T0-T1), a second operation state (T1-T2), a third operation state (T2-T3), and a fourth operation state (T3-T4).

In the first operating state (T0-T1), as shown in fig. 5, the first switching tube Q1, the third switching tube Q3, the sixth switching tube Q6 and the eighth switching tube Q8 are all turned on, the second switching tube Q2, the fourth switching tube Q4, the fifth switching tube Q5 and the seventh switching tube Q7 are all turned off, and the two ends of the switching branch 130 are turned off. In the second operating state (T1-T2), as shown in fig. 6, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 are all turned off, and two ends of the switching branch 130 are turned on. In a third operating state (T2-T3), as shown in fig. 7, the second switching tube Q2, the fourth switching tube Q4, the fifth switching tube Q5 and the seventh switching tube Q7 are all turned on, the first switching tube Q1, the third switching tube Q3, the sixth switching tube Q6 and the eighth switching tube Q8 are all turned off, and two ends of the switching branch 130 are disconnected. In the fourth operating state (T3-T4), as shown in fig. 8, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 are all turned off, and both ends of the switching branch 130 are turned on.

For example, as shown in fig. 4, U1 represents the on/off states of the first switching tube Q1, the third switching tube Q3, the sixth switching tube Q6 and the eighth switching tube Q8, U2 represents the on/off states of the second switching tube Q2, the fourth switching tube Q4, the fifth switching tube Q5 and the seventh switching tube Q7, U3 represents the on/off states of both ends of the switching branch 130, UA represents the voltage waveform of the first connection point A1, UB represents the voltage waveform of the second connection point B1, and I represents the current waveform of the switching branch 130.

IN the first operating state (T0-T1), as shown IN fig. 5, the first switching tube Q1 and the third switching tube Q3 are both turned on, and the second switching tube Q2 and the fourth switching tube Q4 are both turned off, so that the input terminal IN is electrically connected to the first output terminal OUT1 through the first capacitor CF1. The sixth switching tube Q6 and the eighth switching tube Q8 are both turned on, and the fifth switching tube Q5 and the seventh switching tube Q7 are both turned off, so that the first output end OUT1 is grounded through the second capacitor CF2, that is, the second capacitor CF2 is connected in parallel with the first output capacitor Cout 1. Further, the first end of switching leg 130 is disconnected from the second end of switching leg 130.

At this time, the voltage of the first end of the second switch Q2 is the input voltage Vin, and the voltage of the second end of the second switch Q2 is the first output voltage Vout1, so that the voltage difference between the two ends of the second switch Q2 is Vin-Vout1, i.e. Vin/2. The voltage of the first end of the fourth switching tube Q4 is the first output voltage Vout1, and the voltage of the second end of the fourth switching tube Q4 is 0, so that the voltage difference between the two ends of the fourth switching tube Q4 is Vout1, i.e. Vin/2. The voltage of the first terminal of the fifth switch Q5 is the input voltage Vin, and the voltage of the second terminal of the fifth switch Q5 is the first output voltage Vout1, so that the voltage difference between the two terminals of the fifth switch Q5 is Vin-Vout1, i.e. Vin/2. The voltage of the first terminal of the seventh switching tube Q7 is the first output voltage Vout1, and the voltage of the second terminal of the seventh switching tube Q7 is 0, so that the voltage difference between the two terminals of the seventh switching tube Q7 is Vout1, i.e. Vin/2.

In the second operating state, as shown in fig. 6, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 are all turned off. When the two ends of the switching branch 130 are turned on, the current flows from the first connection point A1 to the second connection point B1, so that the voltage of the first connection point A1 decreases, the voltage of the second connection point B1 increases, until the voltage of the first connection point A1 is equal to the voltage of the second connection point B1, and the current of the switching branch 130 is 0. Since the voltage of the first connection point A1 is Vout1 and the voltage of the second connection point B1 is 0 before the switching branch 130 is turned on, the voltage of the first connection point A1 and the voltage of the second connection point B1 are both stabilized at Vout1/2 after the switching branch 130 is turned on.

At this time, the voltage at the first end of the second switch tube Q2 is reduced to Vin-Vout1/2, and the voltage difference between the two ends of the second switch tube Q2 is reduced to Vin-Vout1/2-Vout1, i.e. Vin/4. The voltage of the first end of the fourth switching tube Q4 is reduced to Vout1/2, and the voltage difference between the two ends of the fourth switching tube Q4 is reduced to Vout1/2, i.e. Vin/4. The voltage at the second end of the fifth switch tube Q5 is increased to 3Vout1/2, and the voltage difference between the two ends of the fifth switch tube Q5 is decreased to Vin-3Vout1/2, i.e. Vin/4. The voltage at the second end of the seventh switch tube Q7 is increased to Vout1/2, and the voltage difference between the two ends of the seventh switch tube Q7 is decreased to Vout1/2, i.e., vin/4.

To sum up, in the second operating state, the voltage difference between the two ends of the second switching tube Q2 before being turned on may be reduced from Vin/2 to Vin/4, the voltage difference between the two ends of the fourth switching tube Q4 before being turned on may be reduced from Vin/2 to Vin/4, the voltage difference between the two ends of the fifth switching tube Q5 before being turned on may be reduced from Vin/2 to Vin/4, and the voltage difference between the two ends of the seventh switching tube Q7 before being turned on may be reduced from Vin/2 to Vin/4.

IN a third operating state (T2-T3), as shown IN fig. 7, the second switching tube Q2 and the fourth switching tube Q4 are both turned on, and the first switching tube Q1 and the third switching tube Q3 are both turned off, so that the input terminal IN is electrically connected to the first output terminal OUT1 through the second capacitor CF2. The fifth switch tube Q5 and the seventh switch tube Q7 are both turned on, and the sixth switch tube Q6 and the eighth switch tube Q8 are both turned off, so that the first output end OUT1 is grounded through the first capacitor CF1, that is, the first capacitor CF1 is connected in parallel with the first output capacitor Cout 1. In addition, the first terminal of the switching leg 130 and the second terminal of the switching leg 130 are disconnected.

At this time, the voltage of the first end of the first switch tube Q1 is the input voltage Vin, and the voltage of the second end of the first switch tube Q1 is the first output voltage Vout1, so that the voltage difference between the two ends of the first switch tube Q1 is Vin-Vout1, i.e. Vin/2. The voltage at the first end of the third transistor Q3 is the first output voltage Vout1, and the voltage at the second end of the third transistor Q3 is 0, so that the voltage difference between the two ends of the third transistor Q3 is Vout1, i.e. Vin/2. The voltage of the first terminal of the sixth switching tube Q6 is the input voltage Vin, and the voltage of the second terminal of the sixth switching tube Q6 is the first output voltage Vout1, so that the voltage difference between the two terminals of the sixth switching tube Q6 is Vin-Vout1, i.e. Vin/2. The voltage at the first end of the eighth switch Q8 is the first output voltage Vout1, and the voltage at the second end of the eighth switch Q8 is 0, so that the voltage difference between the two ends of the eighth switch Q8 is Vout1, i.e. Vin/2.

In the fourth operating state, as shown in fig. 8, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7, and the eighth switching tube Q8 are all turned off. When the two ends of the switching branch 130 are turned on, the current flows from the second connection point B1 to the first connection point A1, so that the voltage of the second connection point B1 decreases, the voltage of the first connection point A1 increases, until the voltage of the first connection point A1 is equal to the voltage of the second connection point, and the current of the switching branch 130 is 0. Since the voltage of the second connection point B1 is Vout1 and the voltage of the first connection point A1 is 0 before the switching branch 130 is turned on, the voltage of the first connection point A1 and the voltage of the second connection point B1 are both stabilized at Vout1/2 after the switching branch 130 is turned on.

At this time, the voltage of the second end of the first switch tube Q1 is increased to 3Vout1/2, and the voltage difference between the two ends of the first switch tube Q1 is decreased to Vin-3Vout1/2, i.e. Vin/4. The voltage at the second end of the third transistor Q3 is increased to Vout1/2, and the voltage difference between the two ends of the third transistor Q3 is decreased to Vout1/2, i.e., vin/4. The voltage at the first end of the sixth switching tube Q6 is reduced to Vin-Vout1/2, and the voltage difference between the two ends of the sixth switching tube Q6 is reduced to Vin-Vout1/2-Vout1, i.e. Vin/4. The voltage at the first end of the eighth switch tube Q8 is reduced to Vout1/2, and the voltage difference between the two ends of the eighth switch tube Q8 is reduced to Vout1/2, i.e. Vin/4.

In summary, in the fourth operating state, the voltage difference between the two ends of the first switch Q1 before being turned on may be decreased from Vin/2 to Vin/4, the voltage difference between the two ends of the third switch Q3 before being turned on may be decreased from Vin/2 to Vin/4, the voltage difference between the two ends of the sixth switch Q6 before being turned on may be decreased from Vin/2 to Vin/4, and the voltage difference between the two ends of the eighth switch Q8 before being turned on may be decreased from Vin/2 to Vin/4.

In the embodiment of the present application, in the second working state, half of the charges on the first branch circuit 110 can be transferred to the second branch circuit 120 by turning on the switching branch circuit 130, so that before the second switching tube Q2, the fourth switching tube Q4, the fifth switching tube Q5 and the seventh switching tube Q7 are turned on, the voltage difference between two ends of the second switching tube Q2, the voltage difference between two ends of the fourth switching tube Q4, the voltage difference between two ends of the fifth switching tube Q5 and the voltage difference between two ends of the seventh switching tube Q7 are all reduced; in the fourth operating state, half of the charge in the second branch 120 can be transferred to the first branch 110 through the switch branch 130, so that before the first switch Q1, the third switch Q3, the sixth switch Q6 and the eighth switch Q8 are turned on, the voltage difference between the two ends of the first switch Q1, the voltage difference between the two ends of the third switch Q3, the voltage difference between the two ends of the sixth switch Q6 and the voltage difference between the two ends of the eighth switch Q8 are all reduced. Therefore, before the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 are turned on, the voltage difference between the two ends of the first switch tube Q1, the voltage difference between the two ends of the second switch tube Q2, the voltage difference between the two ends of the third switch tube Q3, the voltage difference between the two ends of the fourth switch tube Q4, the voltage difference between the two ends of the fifth switch tube Q5, the voltage difference between the two ends of the sixth switch tube Q6, the voltage difference between the two ends of the seventh switch tube Q7 and the voltage difference between the two ends of the eighth switch tube Q8 are all reduced, so that the switching loss of the switched capacitor voltage conversion circuit can be reduced, and the conversion efficiency of the switched capacitor voltage conversion circuit is improved.

In some embodiments, as shown in fig. 2 and 3, the switching branch 130 includes a first switching component 131, a first end of the first switching component 131 is electrically connected to the first capacitor CF1, and a second end of the first switching component 131 is electrically connected to the second capacitor CF2.

For example, as shown in fig. 2, a first terminal of the first switch assembly 131 is electrically connected to the second plate of the first capacitor CF1, and a second terminal of the first switch assembly 131 is electrically connected to the second plate of the second capacitor CF2, so that the second plate of the first capacitor CF1 and the second plate of the second capacitor CF2 can be turned on based on the first switch assembly 131. In other embodiments, as shown in fig. 3, a first terminal of the first switch assembly 131 is electrically connected to the first plate of the first capacitor CF1, and a second terminal of the first switch assembly 131 is electrically connected to the first plate of the second capacitor CF2, so that the first plate of the first capacitor CF1 and the first plate of the second capacitor CF2 can be turned on based on the first switch assembly 131.

In some embodiments, the first switch assembly 110 includes a Metal Oxide Semiconductor (MOS) fet, which may be referred to as a MOS transistor QX, as shown in fig. 2 and 3. Wherein, the MOS transistor QX may be an NMOS, such as the MOS transistor QX' shown in fig. 9; the MOS transistor QX may also be a PMOS transistor, such as the MOS transistor QX ″ shown in fig. 9, and the embodiment of the present application does not specifically limit the type of the MOS transistor QX.

In some embodiments, the first switching element 110 includes two laterally diffused Metal Oxide Semiconductor (MOS) fets, i.e., a first LDMOS transistor QXA and a second LDMOS transistor QXB, respectively, as shown in fig. 9. Wherein, the first LDMOS tube QXA and the second LDMOS tube QXB may be both PMOS, respectively as shown in fig. 9 as LDMOS tube QXA 'and LDMOS tube QXB'; the first LDMOS transistor QXA and the second LDMOS transistor QXB may also be NMOS, which are shown in fig. 9 as LDMOS transistor QXA "and LDMOS transistor QXB", respectively, and the types of the first LDMOS transistor QXA and the second LDMOS transistor QXB are not specifically limited in this embodiment of the application.

In some embodiments, fig. 10 is a schematic structural diagram of another switched capacitor voltage converting circuit provided in the embodiments of the present application, and as shown in fig. 10, the first branch circuit 110 includes: the circuit comprises a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a first capacitor CF1, a second capacitor CF2 and a third capacitor CF3. The second branch 120 includes a ninth switching tube Q9, a tenth switching tube Q10, an eleventh switching tube Q11, a twelfth switching tube Q12, a thirteenth switching tube Q13, a fourteenth switching tube Q14, a fifteenth switching tube Q15, a sixteenth switching tube Q16, a fourth capacitor CF4, a fifth capacitor CF5, and a sixth capacitor CF6.

The first end of the first switch tube Q1 and the first end of the ninth switch tube Q9 are both electrically connected to the input terminal IN, the second end of the first switch tube Q1 is electrically connected to the first end of the second switch tube Q2 and the first pole plate of the first capacitor CF1, the second end of the ninth switch tube Q9 is electrically connected to the first end of the tenth switch tube Q10 and the first pole plate of the fourth capacitor CF4, the second end of the second switch tube Q2 is electrically connected to the first end of the third switch tube Q3 and the first pole plate of the second capacitor CF2, the second end of the tenth switch tube Q10 is electrically connected to the first end of the eleventh switch tube Q11 and the first pole plate of the fifth capacitor CF5, the second end of the third switch tube Q3 is electrically connected to the first end of the fourth switch tube Q4 and the first pole plate of the third capacitor CF3, and the second end of the first end of the eleventh switch tube Q11 is electrically connected to the first end of the twelfth switch tube Q12 and the first pole plate of the sixth capacitor CF6.

The second end of the fourth switching tube Q4, the first end of the fifth switching tube Q5, the first end of the seventh switching tube Q7, the second end of the twelfth switching tube Q12, the first end of the thirteenth switching tube Q13 and the first end of the fifteenth switching tube Q15 are all electrically connected to the first output end OUT1, the second end of the fifth switching tube Q5 is electrically connected to the first end of the sixth switching tube Q6, the second pole plate of the first capacitor CF1 and the second pole plate of the third capacitor CF3, the second end of the thirteenth switching tube Q13 is electrically connected to the first end of the fourteenth switching tube Q14, the second pole plate of the fourth capacitor CF4 and the second pole plate of the sixth capacitor CF6, and the second end of the sixth switching tube Q6 and the second end of the fourteenth switching tube Q14 are all grounded.

The second end of the seventh switching tube Q7 is electrically connected to the first end of the eighth switching tube Q8, the second end of the fifteenth switching tube Q15 is electrically connected to the first end of the sixteenth switching tube Q16, and the second ends of the eighth switching tube Q8 and the sixteenth switching tube Q16 are both grounded.

In some embodiments, with continued reference to fig. 10, the switching branch 130 includes a first switching component 131 and a second switching component 132, wherein a first end of the first switching component 131 is electrically connected to the second capacitor CF2, a second end of the first switching component 131 is electrically connected to the fifth capacitor CF5, a first end of the second switching component 132 is electrically connected to the first capacitor CF1, and a second end of the second switching component 132 is electrically connected to the fourth capacitor CF4.

For example, as shown in fig. 10, a first end of the first switch assembly 131 is electrically connected to the second plate of the second capacitor CF2, a second end of the first switch assembly 131 is electrically connected to the second plate of the fifth capacitor CF5, a first end of the second switch assembly 132 is electrically connected to the second plate of the first capacitor CF1, and a second end of the second switch assembly 132 is electrically connected to the second plate of the fourth capacitor CF4. A connection point of the second plate of the second capacitor CF2, the second end of the seventh switching tube Q7 and the first end of the eighth switching tube Q8 is used as a first connection point A1, a connection point of the second plate of the fifth capacitor CF5, the second end of the fifteenth switching tube Q15 and the first end of the sixteenth switching tube Q16 is used as a second connection point B1, a connection point of the second plate of the fourth capacitor CF4, the second plate of the sixth capacitor CF6, the second end of the thirteenth switching tube Q13 and the first end of the fourteenth switching tube Q14 is used as a third connection point A2, and a connection point of the second plate of the first capacitor CF1, the second plate of the third capacitor CF3, the second end of the fifth switching tube Q5 and the first end of the sixth switching tube Q6 is used as a fourth connection point B2.

In other embodiments, the first end of the first switch assembly 131 is electrically connected to the first plate of the second capacitor CF2, the second end of the first switch assembly 131 is electrically connected to the first plate of the fifth capacitor CF5, the first end of the second switch assembly 132 is electrically connected to the first plate of the first capacitor CF1, and the second end of the second switch assembly 132 is electrically connected to the first plate of the fourth capacitor CF4.

The switched-capacitor voltage converting circuit 100 may be a switched-capacitor voltage converting circuit of Dickson4:1, as shown in fig. 10, correspondingly, one working cycle of the switched-capacitor voltage converting circuit 100 includes a first working state (T0-T1), a second working state (T1-T2), a third working state (T2-T3), and a fourth working state (T3-T4), as shown in fig. 11, and fig. 11 is an operation timing diagram of another switched-capacitor voltage converting circuit provided in this embodiment of the present application.

Referring to fig. 10 and 11, U1 represents on/off states of the first, third, fifth, eighth, tenth, twelfth, fourteenth, and fifteenth switching tubes Q1, Q3, Q5, Q8, Q10, Q12, Q14, and Q15, U2 represents on/off states of the second, fourth, sixth, seventh, ninth, eleventh, thirteenth, and sixteenth switching tubes Q2, Q4, Q6, Q7, Q9, Q11, Q13, and Q16, U3 represents on/off states of the first and

second switching elements

131 and 132, UA represents voltage waveforms of the first and third connection points A1 and A2, UB represents voltage waveforms of the second and fourth connection points B1 and B2, and I represents current waveforms of the first and

second switching elements

131 and 132.

In a first operating state (T0-T1), the first switching tube Q1, the third switching tube Q3, the fifth switching tube Q5, the eighth switching tube Q8, the tenth switching tube Q10, the twelfth switching tube Q12, the fourteenth switching tube Q14 and the fifteenth switching tube Q15 are all turned on, the second switching tube Q2, the fourth switching tube Q4, the sixth switching tube Q6, the seventh switching tube Q7, the ninth switching tube Q9, the eleventh switching tube Q11, the thirteenth switching tube Q13 and the sixteenth switching tube Q16 are all turned off, two ends of the first switching element 131 are disconnected, and two ends of the second switching element 132 are disconnected.

In a second operating state (T1-T2), the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11, the twelfth switching tube Q12, the thirteenth switching tube Q13, the fourteenth switching tube Q14, the fifteenth switching tube Q15, and the sixteenth switching tube Q16 are all turned off, two ends of the first switching element 131 are turned on, and two ends of the second switching element 132 are turned on. Partial charge of the first branch circuit 110 may be transferred to the second branch circuit 120 through the first switching component 131 and the second switching component 132, such that before the second switching tube Q2, the fourth switching tube Q4, the sixth switching tube Q6, the seventh switching tube Q7, the ninth switching tube Q9, the eleventh switching tube Q11, the thirteenth switching tube Q13 and the sixteenth switching tube Q16 are turned on, a voltage difference between two ends of the second switching tube Q2, a voltage difference between two ends of the fourth switching tube Q4, a voltage difference between two ends of the sixth switching tube Q6, a voltage difference between two ends of the seventh switching tube Q7, a voltage difference between two ends of the ninth switching tube Q9, a voltage difference between two ends of the eleventh switching tube Q11, a voltage difference between two ends of the thirteenth switching tube Q13 and a voltage difference between two ends of the sixteenth switching tube Q16 are all reduced.

In a third operating state (T2-T3), the second switching tube Q2, the fourth switching tube Q4, the sixth switching tube Q6, the seventh switching tube Q7, the ninth switching tube Q9, the eleventh switching tube Q11, the thirteenth switching tube Q13 and the sixteenth switching tube Q16 are all turned on, the first switching tube Q1, the third switching tube Q3, the fifth switching tube Q5, the eighth switching tube Q8, the tenth switching tube Q10, the twelfth switching tube Q12, the fourteenth switching tube Q14 and the fifteenth switching tube Q15 are all turned off, both ends of the first switching element 131 are turned off, and both ends of the second switching element 132 are turned off.

In a fourth operating state (T3-T4), the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11, the twelfth switching tube Q12, the thirteenth switching tube Q13, the fourteenth switching tube Q14, the fifteenth switching tube Q15, and the sixteenth switching tube Q16 are all turned off, two ends of the first switching element 131 are turned on, and two ends of the second switching element 132 are turned on. Partial charges of the second branch circuit 120 may be transferred to the first branch circuit 110 through the first switch component 131 and the second switch component 132, so that before the first switch tube Q1, the third switch tube Q3, the fifth switch tube Q5, the eighth switch tube Q8, the tenth switch tube Q10, the twelfth switch tube Q12, the fourteenth switch tube Q14 and the fifteenth switch tube Q15 are turned on, a voltage difference between two ends of the first switch tube Q1, a voltage difference between two ends of the third switch tube Q3, a voltage difference between two ends of the fifth switch tube Q5, a voltage difference between two ends of the eighth switch tube Q8, a voltage difference between two ends of the tenth switch tube Q10, a voltage difference between two ends of the twelfth switch tube Q12, a voltage difference between two ends of the fourteenth switch tube Q14 and a voltage difference between two ends of the fifteenth switch tube Q15 are all reduced.

In summary, by inserting the second operating state between the first operating state and the third operating state, and inserting the fourth operating state between the third operating state and the first operating state of the next cycle, the voltage difference between the two ends of each switch in the first branch 110 and the second branch 120 before being turned on can be reduced, so that the switching loss of each switch can be reduced, and the conversion efficiency of the switch capacitor voltage conversion circuit can be improved.

In some embodiments, fig. 12 is a schematic structural diagram of another switched capacitor voltage converting circuit provided in the embodiments of the present application, and as shown in fig. 12, the first branch circuit 110 includes: the circuit comprises a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6, a first capacitor CF1, a second capacitor CF2 and a third capacitor CF3. The second branch circuit 120 includes a seventh switch tube Q7, an eighth switch tube Q8, a ninth switch tube Q9, a tenth switch tube Q10, an eleventh switch tube Q11, a twelfth switch tube Q12, a fourth capacitor CF4, a fifth capacitor CF5, and a sixth capacitor CF6.

The first end of the first switch tube Q1 and the first end of the seventh switch tube Q7 are both electrically connected to the input terminal IN, the second end of the first switch tube Q1 is electrically connected to the first end of the second switch tube Q2 and the first pole plate of the first capacitor CF1, the second end of the seventh switch tube Q7 is electrically connected to the first end of the eighth switch tube Q8 and the first pole plate of the fourth capacitor CF4, the second end of the second switch tube Q2 is electrically connected to the first end of the third switch tube Q3 and the first pole plate of the second capacitor CF2, the second end of the eighth switch tube Q8 is electrically connected to the first end of the ninth switch tube Q9 and the first pole plate of the fifth capacitor CF5, the second end of the third switch tube Q3 is electrically connected to the first end of the fourth switch tube Q4 and the first pole plate of the third capacitor CF3, and the second end of the ninth switch tube Q9 is electrically connected to the first end of the tenth switch tube Q10 and the first pole plate of the sixth capacitor CF6.

The second end of the fourth switching tube Q4, the first end of the fifth switching tube Q5, the second end of the tenth switching tube Q10 and the first end of the eleventh switching tube Q11 are all electrically connected to the first output end OUT1, the second end of the fifth switching tube Q5 is electrically connected to the first end of the sixth switching tube Q6, the second pole plate of the first capacitor CF1, the second pole plate of the third capacitor CF3 and the second pole plate of the fifth capacitor CF5, the second end of the eleventh switching tube Q11 is electrically connected to the first end of the twelfth switching tube Q12, the second pole plate of the fourth capacitor CF4, the second pole plate of the sixth capacitor CF6 and the second pole plate of the second capacitor CF2, and the second end of the sixth switching tube Q6 and the second end of the twelfth switching tube Q12 are all grounded.

In some embodiments, with continued reference to fig. 12, the switching branch 130 includes a first switching component 131, a first terminal of the first switching component 131 is electrically connected to the first capacitor CF1, and a second terminal of the first switching component 131 is electrically connected to the fourth capacitor CF4.

Illustratively, as shown in fig. 12, a first end of the first switch assembly 131 is electrically connected to the second plate of the first capacitor CF1, and a second end of the first switch assembly 131 is electrically connected to the second plate of the fourth capacitor CF4. The connection point of the second polar plate of the first capacitor CF1, the second polar plate of the third capacitor CF3, the second polar plate of the fifth capacitor CF5, the second end of the fifth switch tube Q5 and the first end of the sixth switch tube Q6 is used as a first connection point A1, and the connection point of the second polar plate of the fourth capacitor CF4, the second polar plate of the sixth capacitor CF6, the second polar plate of the second capacitor CF2, the second end of the eleventh switch tube Q11 and the first end of the twelfth switch tube Q12 is used as a second connection point B1. In other embodiments, a first end of the first switch assembly 131 may be electrically connected to the first plate of the first capacitor CF1, and a second end of the first switch assembly 131 may be electrically connected to the first plate of the fourth capacitor CF4.

The switch-capacitor voltage converting circuit 100 may be a modified Dickson4:1 switch-capacitor voltage converting circuit, as shown in fig. 12, and accordingly, one working cycle of the switch-capacitor voltage converting circuit 100 includes a first working state (T0-T1), a second working state (T1-T2), a third working state (T2-T3), and a fourth working state (T3-T4), as shown in fig. 13, and fig. 13 is an operation timing diagram of another switch-capacitor voltage converting circuit provided in an embodiment of the present application.

Referring to fig. 12 and 13, U1 represents on/off states of the first, third, fifth, eighth, tenth, and twelfth switching tubes Q1, Q3, Q5, Q8, Q10, and Q12, U2 represents on/off states of the second, fourth, sixth, seventh, ninth, and eleventh switching tubes Q2, Q4, Q6, Q7, Q9, and Q11, U3 represents on/off states of the first switching element 131, UA represents a voltage waveform of the first connection point A1, UB represents a voltage waveform of the second connection point B1, and I represents a current waveform of the first switching element 131.

In a first working state (T0-T1), the first switching tube Q1, the third switching tube Q3, the fifth switching tube Q5, the eighth switching tube Q8, the tenth switching tube Q10 and the twelfth switching tube Q12 are all turned on, the second switching tube Q2, the fourth switching tube Q4, the sixth switching tube Q6, the seventh switching tube Q7, the ninth switching tube Q9 and the eleventh switching tube Q11 are all turned off, and two ends of the first switching assembly 131 are disconnected.

In a second operating state (T1-T2), the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11 and the twelfth switching tube Q12 are all turned off, and two ends of the first switching element 131 are turned on. Partial charges of the first branch circuit 110 may be transferred to the second branch circuit 120 through the first switch component 131, so that before the second switch tube Q2, the fourth switch tube Q4, the sixth switch tube Q6, the seventh switch tube Q7, the ninth switch tube Q9 and the eleventh switch tube Q11 are turned on, a voltage difference across the second switch tube Q2, a voltage difference across the fourth switch tube Q4, a voltage difference across the sixth switch tube Q6, a voltage difference across the seventh switch tube Q7, a voltage difference across the ninth switch tube Q9 and a voltage difference across the eleventh switch tube Q11 are all reduced.

In a third operating state (T2-T3), the second switching tube Q2, the fourth switching tube Q4, the sixth switching tube Q6, the seventh switching tube Q7, the ninth switching tube Q9 and the eleventh switching tube Q11 are all turned on, the first switching tube Q1, the third switching tube Q3, the fifth switching tube Q5, the eighth switching tube Q8, the tenth switching tube Q10 and the twelfth switching tube Q12 are all turned off, and both ends of the first switching assembly 131 are disconnected.

In a fourth operating state (T3-T4), the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11 and the twelfth switching tube Q12 are all turned off, and two ends of the first switching element 131 are turned on. Partial charges of the second branch 120 may be transferred to the first branch 110 through the first switch component 131, so that before the first switch tube Q1, the third switch tube Q3, the fifth switch tube Q5, the eighth switch tube Q8, the tenth switch tube Q10 and the twelfth switch tube Q12 are turned on, a voltage difference between two ends of the first switch tube Q1, a voltage difference between two ends of the third switch tube Q3, a voltage difference between two ends of the fifth switch tube Q5, a voltage difference between two ends of the eighth switch tube Q8, a voltage difference between two ends of the tenth switch tube Q10 and a voltage difference between two ends of the twelfth switch tube Q12 are all reduced.

In some embodiments, fig. 14 is a schematic structural diagram of another switched capacitor voltage converting circuit provided in the embodiments of the present application, and as shown in fig. 14, the first branch circuit 110 includes: the circuit comprises a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a first capacitor CF1 and a second capacitor CF2. The second branch circuit 120 includes a ninth switching tube Q9, a tenth switching tube Q10, an eleventh switching tube Q11, a twelfth switching tube Q12, a thirteenth switching tube Q13, a fourteenth switching tube Q14, a fifteenth switching tube Q15, a sixteenth switching tube Q16, a third capacitor CF3, and a fourth capacitor CF4.

The first end of the second switch tube Q2 and the second end of the tenth switch tube Q10 are both electrically connected to the input terminal IN, the second end of the second switch tube Q2 is electrically connected to the first end of the third switch tube Q3 and the first polar plate of the first capacitor CF1, the second polar plate of the first capacitor CF1 is electrically connected to the first end of the first switch tube Q1 and the first end of the fourth switch tube Q4, and the second end of the first switch tube Q1 is grounded; the second end of the tenth switch Q10 is electrically connected to the first end of the eleventh switch Q11 and the first plate of the third capacitor CF3, the second plate of the third capacitor CF3 is electrically connected to the first end of the ninth switch Q9 and the first end of the twelfth switch Q12, and the second end of the ninth switch Q9 is grounded.

The second end of the third switching tube Q3, the first end of the fifth switching tube Q5, the second end of the eleventh switching tube Q11 and the first end of the thirteenth switching tube Q13 are all electrically connected to the first output terminal OUT1, the second end of the fifth switching tube Q5 is electrically connected to the second end of the twelfth switching tube Q12, the first end of the fourteenth switching tube Q14 and the first plate of the fourth capacitor CF4, and the second end of the thirteenth switching tube Q13 is electrically connected to the second end of the fourth switching tube Q4, the first end of the sixth switching tube Q6 and the first plate of the second capacitor CF2.

The second plate of the second capacitor CF2 is electrically connected to the first end of the seventh switch Q7 and the first end of the eighth switch Q8, the second plate of the fourth capacitor CF4 is electrically connected to the first end of the fifteenth switch Q15 and the first end of the sixteenth switch Q16, the second end of the sixth switch Q6, the second end of the seventh switch Q7, the second end of the fourteenth switch Q14 and the second end of the fifteenth switch Q15 are all electrically connected to the second output terminal OUT2 of the switched capacitor voltage converting circuit 100, and the second end of the eighth switch Q8 and the second end of the sixteenth switch Q16 are all grounded.

For example, as shown in fig. 14, the second output terminal OUT2 is grounded through the second output capacitor Cout2, and the switched-capacitor voltage conversion circuit 100 may convert the input voltage Vin into the first output voltage Vout1 and output the first output voltage Vout1 based on the first output terminal OUT1, and may also convert the input voltage Vin into the second output voltage Vout2 and output the second output voltage Vout2 based on the second output terminal OUT 2. In this way, the switched capacitor voltage converter circuit 100 can implement multiple outputs.

In some embodiments, with continued reference to fig. 14, the switching branch 130 includes a first switching component 131 and a second switching component 132, wherein a first terminal of the first switching component 131 is electrically connected to the first capacitor CF1, a second terminal of the first switching component 131 is electrically connected to the third capacitor CF3, a first terminal of the second switching component 132 is electrically connected to the second capacitor CF2, and a second terminal of the second switching component 132 is electrically connected to the fourth capacitor CF4.

For example, as shown in fig. 14, a first end of the first switch assembly 131 is electrically connected to the second plate of the first capacitor CF1, a second end of the first switch assembly 131 is electrically connected to the second plate of the third capacitor CF3, a first end of the second switch assembly 132 is electrically connected to the second plate of the second capacitor CF2, and a second end of the second switch assembly 132 is electrically connected to the second plate of the fourth capacitor CF4. A connection point of the second polar plate of the first capacitor CF1, the first end of the first switching tube Q1 and the first end of the fourth switching tube Q4 is taken as a first connection point A1, a connection point of the second polar plate of the third capacitor CF3, the first end of the ninth switching tube Q9 and the first end of the thirteenth switching tube Q13 is taken as a second connection point B1, a connection point of the second polar plate of the second capacitor CF2, the first end of the seventh switching tube Q7 and the first end of the eighth switching tube Q8 is taken as a third connection point A2, and a connection point of the second polar plate of the fourth capacitor CF4, the first end of the fifteenth switching tube Q15 and the first end of the sixteenth switching tube Q16 is taken as a fourth connection point B2.

In other embodiments, the first end of the first switch assembly 131 is electrically connected to the first plate of the first capacitor CF1, the second end of the first switch assembly 131 is electrically connected to the first plate of the third capacitor CF3, the first end of the second switch assembly 132 is electrically connected to the first plate of the second capacitor CF2, and the second end of the second switch assembly 132 is electrically connected to the first plate of the fourth capacitor CF4.

The switch-capacitor voltage converting circuit 100 may be a Cascade4:1 switch-capacitor voltage converting circuit, as shown in fig. 14, and accordingly, one working cycle of the switch-capacitor voltage converting circuit 100 includes a first working state (T0-T1), a second working state (T1-T2), a third working state (T2-T3), and a fourth working state (T3-T4), as shown in fig. 15, and fig. 15 is an operation timing diagram of another switch-capacitor voltage converting circuit provided in this embodiment of the present application.

Referring to fig. 14 and 15, U1 represents on/off states of the second, fourth, seventh, ninth, eleventh, thirteenth, fourteenth, and sixteenth switching tubes Q2, Q7, Q9, Q6, Q8, Q10, Q12, and Q16, U2 represents on/off states of the first, third, fifth, sixth, eighth, tenth, and fifteenth switching tubes Q1, Q3, Q5, Q6, UA represents voltage waveforms of the first and third connection points A1 and A2, UB represents voltage waveforms of the second and fourth connection points B1 and B2, and I represents current waveforms of the first and

second switching elements

131 and 132.

In the first operating state (T0-T1), the second switching tube Q2, the fourth switching tube Q4, the seventh switching tube Q7, the ninth switching tube Q9, the eleventh switching tube Q11, the thirteenth switching tube Q13, the fourteenth switching tube Q14 and the sixteenth switching tube Q16 are all turned on, the first switching tube Q1, the third switching tube Q3, the fifth switching tube Q5, the sixth switching tube Q6, the eighth switching tube Q8, the tenth switching tube Q10, the twelfth switching tube Q12 and the fifteenth switching tube Q15 are all turned off, both ends of the first switching element 131 are turned off, and both ends of the second switching element 132 are turned off.

In the second operating state (T1-T2), the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11, the twelfth switching tube Q12, the thirteenth switching tube Q13, the fourteenth switching tube Q14, the fifteenth switching tube Q15, and the sixteenth switching tube Q16 are all turned off, two ends of the first switching element 131 are turned on, and two ends of the second switching element 132 are turned on. Partial charges of the first branch circuit 110 may be transferred to the second branch circuit 120 through the first switching component 131 and the second switching component 132, so that before the first switching tube Q1, the third switching tube Q3, the fifth switching tube Q5, the sixth switching tube Q6, the eighth switching tube Q8, the tenth switching tube Q10, the twelfth switching tube Q12 and the fifteenth switching tube Q15 are turned on, a voltage difference between two ends of the first switching tube Q1, a voltage difference between two ends of the third switching tube Q3, a voltage difference between two ends of the fifth switching tube Q5, a voltage difference between two ends of the sixth switching tube Q6, a voltage difference between two ends of the eighth switching tube Q8, a voltage difference between two ends of the tenth switching tube Q10, a voltage difference between two ends of the twelfth switching tube Q12 and a voltage difference between two ends of the fifteenth switching tube Q15 are all reduced.

In a third operating state (T2-T3), the first, third, fifth, sixth, eighth, tenth, twelfth, and fifteenth switching tubes Q1, Q3, Q5, Q6, Q8, Q10, Q12, and Q15 are all turned on, the second, fourth, seventh, ninth, eleventh, thirteenth, fourteenth, and sixteenth switching tubes Q2, Q4, Q7, Q9, Q11, Q13, Q14, and Q16 are all turned off, both ends of the first switching element 131 are open, and both ends of the second switching element 132 are open.

In a fourth operating state (T3-T4), the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11, the twelfth switching tube Q12, the thirteenth switching tube Q13, the fourteenth switching tube Q14, the fifteenth switching tube Q15, and the sixteenth switching tube Q16 are all turned off, two ends of the first switching element 131 are turned on, and two ends of the second switching element 132 are turned on. Part of the charge of the second branch 120 may be transferred to the first branch 110 through the first switch component 131 and the second switch component 132, such that the voltage difference across the second switch tube Q2, the fourth switch tube Q4, the seventh switch tube Q7, the ninth switch tube Q9, the eleventh switch tube Q11, the thirteenth switch tube Q13, the fourteenth switch tube Q14, and the sixteenth switch tube Q16 is reduced before the second switch tube Q2, the fourth switch tube Q4, the seventh switch tube Q7, the ninth switch tube Q9, the eleventh switch tube Q11, the thirteenth switch tube Q13, the fourteenth switch tube Q14, and the sixteenth switch tube Q16.

In summary, by inserting the second operating state between the first operating state and the third operating state, and inserting the fourth operating state between the third operating state and the first operating state of the next cycle, the voltage difference between the two ends of each switch in the first branch circuit 110 and the second branch circuit 120 before being turned on can be reduced, so that the switching loss of each switch can be reduced, and the conversion efficiency of the switch capacitor voltage conversion circuit can be improved.

In some embodiments, fig. 16 is a schematic structural diagram of another switched capacitor voltage converting circuit provided in the present embodiment, and fig. 16 is a schematic structural diagram of the embodiment shown in fig. 14, where the first branch circuit 110 further includes a fifth capacitor CF5, and the second branch circuit 120 further includes a sixth capacitor CF6.

The first plate of the fifth capacitor CF5 is electrically connected to the second plate of the first capacitor CF1, the second plate of the fifth capacitor CF5 is electrically connected to the first plate of the second capacitor CF2, the first plate of the sixth capacitor CF6 is electrically connected to the second plate of the third capacitor CF3, and the second plate of the sixth capacitor CF6 is electrically connected to the first plate of the fourth capacitor CF4.

In some embodiments, with continued reference to fig. 16, the switching branch 130 includes a first switching component 131, a first end of the first switching component 131 is electrically connected to the first capacitor CF1, and a second end of the first switching component 131 is electrically connected to the third capacitor CF3.

Illustratively, as shown in fig. 16, a first terminal of the first switch assembly 131 is electrically connected to the second plate of the first capacitor CF1, and a second terminal of the first switch assembly 131 is electrically connected to the second plate of the third capacitor CF3. The connection point of the second polar plate of the first capacitor CF1, the first end of the first switch tube Q1, the first end of the fourth switch tube Q4 and the first polar plate of the fifth capacitor CF5 is taken as a first connection point A1, and the connection point of the second polar plate of the third capacitor CF3, the first end of the ninth switch tube Q9, the first end of the thirteenth switch tube Q13 and the first polar plate of the sixth capacitor CF6 is taken as a second connection point B1. In other embodiments, a first end of the first switch assembly 131 may be electrically connected to the first plate of the first capacitor CF1, and a second end of the first switch assembly 131 may be electrically connected to the first plate of the third capacitor CF3.

The switch-capacitor voltage converting circuit 100 may be a modified Cascade4:1 switch-capacitor voltage converting circuit, as shown in fig. 16, and accordingly, one duty cycle of the switch-capacitor voltage converting circuit 100 includes a first duty state (T0-T1), a second duty state (T1-T2), a third duty state (T2-T3) and a fourth duty state (T3-T4), as shown in fig. 15.

Referring to fig. 16 and 15, U1 represents on/off states of the second, fourth, seventh, ninth, eleventh, thirteenth, fourteenth, and sixteenth switching tubes Q2, Q4, Q7, Q9, Q11, Q13, Q14, Q16, U2 represents on/off states of the first, third, fifth, sixth, eighth, tenth, twelfth, and fifteenth switching tubes Q1, Q3, Q5, Q6, Q8, Q10, Q12, and Q15, U3 represents on/off states of the first switching element 131, UA represents a voltage waveform of the first connection point A1, UB represents a voltage waveform of the second connection point B1, and I represents a current waveform of the first switching element 131.

The operation of the switched-capacitor voltage converting circuit shown in fig. 16 is similar to that of the switched-capacitor voltage converting circuit shown in fig. 15, and is not described again here.

The embodiment of the present application further provides a switched capacitor voltage converter, which includes the switched capacitor voltage conversion circuit 100 provided in any of the above embodiments.

The switched capacitor voltage converter provided in the embodiment of the present application may be a charger or a transformer, or may be other devices capable of implementing voltage conversion, which is not specifically limited in the embodiment of the present application.

The switched capacitor voltage converter provided by the embodiment of the present application includes the switched capacitor voltage conversion circuit 100 provided by any of the above embodiments, and has the same functional modules and beneficial effects as the switched capacitor voltage conversion circuit 100, and details are not repeated here.

The above disclosure is only for the specific embodiments of the present application, but the embodiments of the present application are not limited thereto, and any variations that can be considered by those skilled in the art are intended to fall within the scope of the present application.

The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means can be embodied by one and the same item of hardware. The use of first, second, third, etc. does not denote any order, and the words may be interpreted as names. The steps in the above embodiments should not be construed as limited to the order of execution unless otherwise specified.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present application.

Claims

1. A switched capacitor voltage conversion circuit, comprising: the first branch circuit, the second branch circuit and the switch branch circuit;

the first end of the first branch circuit and the first end of the second branch circuit are both electrically connected with the input end of the switched capacitor voltage conversion circuit, the input end is connected with input voltage, the second end of the first branch circuit and the second end of the second branch circuit are both electrically connected with the first output end of the switched capacitor voltage conversion circuit, the third end of the first branch circuit is electrically connected with the first end of the switched branch circuit, the third end of the second branch circuit is electrically connected with the second end of the switched branch circuit, and the fourth end of the first branch circuit and the fourth end of the second branch circuit are both grounded;

the first branch circuit and the second branch circuit respectively comprise a plurality of switching tubes, and the switching branch circuits are used for conducting a third end of the first branch circuit and a third end of the second branch circuit and reducing the voltage difference of the two ends of each switching tube before conduction;

the switched capacitor voltage conversion circuit is used for converting the input voltage into a first output voltage, wherein the first output voltage is 1/N of the input voltage, and N is an integer greater than or equal to 2.

2. The switched-capacitor voltage conversion circuit of claim 1, wherein the first branch comprises: the second branch circuit comprises a fifth switching tube, a sixth switching tube, a seventh switching tube, an eighth switching tube and a second capacitor;

the first end of the first switch tube and the first end of the second switch tube are both electrically connected with the input end, the second end of the first switch tube is electrically connected with the second end of the second switch tube and the first polar plate of the first capacitor, and the second end of the fifth switch tube is electrically connected with the second end of the sixth switch tube and the first polar plate of the second capacitor;

the second end of second switch tube, the second end of sixth switch tube, the first end of third switch tube with the first end of seventh switch tube is all connected electrically first output, the second end electricity of third switch tube first polar plate of first electric capacity with the first end of fourth switch tube, the second end electricity of seventh switch tube is connected the second polar plate of second electric capacity with the first end of eighth switch tube, the second end of fourth switch tube with the second end of eighth switch tube is all grounded.

3. The switched-capacitor voltage conversion circuit of claim 2, wherein the switching leg comprises a first switching component;

the first end of the first switch assembly is electrically connected with the first capacitor, and the second end of the first switch assembly is electrically connected with the second capacitor.

4. The switched-capacitor voltage conversion circuit of claim 1, wherein the first branch comprises: the second branch circuit comprises a ninth switching tube, a tenth switching tube, an eleventh switching tube, a twelfth switching tube, a thirteenth switching tube, a fourteenth switching tube, a fifteenth switching tube, a sixteenth switching tube, a fourth capacitor, a fifth capacitor and a sixth capacitor;

the first end of the first switch tube and the first end of the ninth switch tube are both electrically connected to the input end, the second end of the first switch tube is electrically connected to the first end of the second switch tube and the first pole plate of the first capacitor, the second end of the ninth switch tube is electrically connected to the first end of the tenth switch tube and the first pole plate of the fourth capacitor, the second end of the second switch tube is electrically connected to the first end of the third switch tube and the first pole plate of the second capacitor, the second end of the tenth switch tube is electrically connected to the first end of the eleventh switch tube and the first pole plate of the fifth capacitor, the second end of the third switch tube is electrically connected to the first end of the fourth switch tube and the first pole plate of the third capacitor, and the second end of the eleventh switch tube is electrically connected to the first end of the twelfth switch tube and the first pole plate of the sixth capacitor;

a second end of the fourth switching tube, a first end of the fifth switching tube, a first end of the seventh switching tube, a second end of the twelfth switching tube, a first end of the thirteenth switching tube, and a first end of the fifteenth switching tube are all electrically connected to the first output end, a second end of the fifth switching tube is electrically connected to a first end of the sixth switching tube, a second polar plate of the first capacitor, and a second polar plate of the third capacitor, a second end of the thirteenth switching tube is electrically connected to a first end of the fourteenth switching tube, a second polar plate of the fourth capacitor, and a second polar plate of the sixth capacitor, and a second end of the sixth switching tube and a second end of the fourteenth switching tube are all grounded;

the second end of the seventh switching tube is electrically connected to the first end of the eighth switching tube, the second end of the fifteenth switching tube is electrically connected to the first end of the sixteenth switching tube, and the second end of the eighth switching tube and the second end of the sixteenth switching tube are both grounded.

5. The switched-capacitor voltage conversion circuit of claim 4, wherein the switching leg comprises a first switching component and a second switching component;

the first end of the first switch assembly is electrically connected with the second capacitor, the second end of the first switch assembly is electrically connected with the fifth capacitor, the first end of the second switch assembly is electrically connected with the first capacitor, and the second end of the second switch assembly is electrically connected with the fourth capacitor.

6. The switched-capacitor voltage conversion circuit of claim 1, wherein the first branch comprises: the second branch circuit comprises a seventh switching tube, an eighth switching tube, a ninth switching tube, a tenth switching tube, an eleventh switching tube, a twelfth switching tube, a fourth capacitor, a fifth capacitor and a sixth capacitor;

the first end of the first switch tube and the first end of the seventh switch tube are both electrically connected to the input end, the second end of the first switch tube is electrically connected to the first end of the second switch tube and the first pole plate of the first capacitor, the second end of the seventh switch tube is electrically connected to the first end of the eighth switch tube and the first pole plate of the fourth capacitor, the second end of the second switch tube is electrically connected to the first end of the third switch tube and the first pole plate of the second capacitor, the second end of the eighth switch tube is electrically connected to the first end of the ninth switch tube and the first pole plate of the fifth capacitor, the second end of the third switch tube is electrically connected to the first end of the fourth switch tube and the first pole plate of the third capacitor, and the second end of the ninth switch tube is electrically connected to the first end of the tenth switch tube and the first pole plate of the sixth capacitor;

the second end of fourth switch tube, the first end of fifth switch tube, the second end of tenth switch tube and the first end of eleventh switch tube is all connected electrically first output, the second end electricity of fifth switch tube the first end of sixth switch tube, the second polar plate of first electric capacity, the second polar plate of third electric capacity and the second polar plate of fifth electric capacity, the second end electricity of eleventh switch tube connect the first end of twelfth switch tube, the second polar plate of fourth electric capacity, the second polar plate of sixth electric capacity and the second polar plate of second electric capacity, the second end of sixth switch tube with the second end of twelfth switch tube is all connected to ground.

7. The switched-capacitor voltage conversion circuit of claim 6, wherein the switching leg comprises a first switching component;

the first end of the first switch assembly is electrically connected with the first capacitor, and the second end of the first switch assembly is electrically connected with the fourth capacitor.

8. The switched-capacitor voltage conversion circuit of claim 1, wherein the first branch comprises: the second branch circuit comprises a ninth switching tube, a tenth switching tube, an eleventh switching tube, a twelfth switching tube, a thirteenth switching tube, a fourteenth switching tube, a fifteenth switching tube, a sixteenth switching tube, a third capacitor and a fourth capacitor;

the first end of the second switch tube and the second end of the tenth switch tube are both electrically connected to the input end, the second end of the second switch tube is electrically connected to the first end of the third switch tube and the first plate of the first capacitor, the second plate of the first capacitor is electrically connected to the first end of the first switch tube and the first end of the fourth switch tube, the second end of the first switch tube is grounded, the second end of the tenth switch tube is electrically connected to the first end of the eleventh switch tube and the first plate of the third capacitor, the second plate of the third capacitor is electrically connected to the first end of the ninth switch tube and the first end of the twelfth switch tube, and the second end of the ninth switch tube is grounded;

the second end of the third switching tube, the first end of the fifth switching tube, the second end of the eleventh switching tube and the first end of the thirteenth switching tube are all electrically connected with the first output end, the second end of the fifth switching tube is electrically connected with the second end of the twelfth switching tube, the first end of the fourteenth switching tube and the first polar plate of the fourth capacitor, and the second end of the thirteenth switching tube is electrically connected with the second end of the fourth switching tube, the first end of the sixth switching tube and the first polar plate of the second capacitor;

the second plate of the second capacitor is electrically connected to the first end of the seventh switch tube and the first end of the eighth switch tube, the second plate of the fourth capacitor is electrically connected to the first end of the fifteenth switch tube and the first end of the sixteenth switch tube, the second end of the sixth switch tube, the second end of the seventh switch tube, the second end of the fourteenth switch tube and the second end of the fifteenth switch tube are all electrically connected to the second output end of the switch capacitor voltage conversion circuit, and the second end of the eighth switch tube and the second end of the sixteenth switch tube are all grounded.

9. The switched-capacitor voltage conversion circuit of claim 8, wherein the switching leg comprises a first switching component and a second switching component;

the first end of the first switch assembly is electrically connected with the first capacitor, the second end of the first switch assembly is electrically connected with the third capacitor, the first end of the second switch assembly is electrically connected with the second capacitor, and the second end of the second switch assembly is electrically connected with the fourth capacitor.

10. The switched-capacitor voltage conversion circuit of claim 8, wherein the first branch further comprises a fifth capacitor, and the second branch further comprises a sixth capacitor;

the first plate of the fifth capacitor is electrically connected with the second plate of the first capacitor, the second plate of the fifth capacitor is electrically connected with the first plate of the second capacitor, the first plate of the sixth capacitor is electrically connected with the second plate of the third capacitor, and the second plate of the sixth capacitor is electrically connected with the first plate of the fourth capacitor.

11. The switched-capacitor voltage conversion circuit of claim 10, wherein the switching leg comprises a first switching component;

the first end of the first switch assembly is electrically connected with the first capacitor, and the second end of the first switch assembly is electrically connected with the third capacitor.

12. A switched capacitor voltage converting circuit according to claim 3, 5, 7, 9 or 11 wherein said first switching element comprises two LDMOS transistors;

alternatively, the first switching component comprises a metal oxide semiconductor field effect transistor (MOS).

13. The switched-capacitor voltage conversion circuit of claim 2, wherein one duty cycle of the switched-capacitor voltage conversion circuit includes a first operating state, a second operating state, a third operating state, and a fourth operating state;

in the first working state, the first switching tube, the third switching tube, the sixth switching tube and the eighth switching tube are all turned on, the second switching tube, the fourth switching tube, the fifth switching tube and the seventh switching tube are all turned off, and two ends of the switching branch are disconnected;

in the second working state, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube are all turned off, and two ends of the switching branch are turned on;

in the third working state, the second switching tube, the fourth switching tube, the fifth switching tube and the seventh switching tube are all turned on, the first switching tube, the third switching tube, the sixth switching tube and the eighth switching tube are all turned off, and two ends of the switching branch are disconnected;

in the fourth operating state, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube are all turned off, and two ends of the switching branch are turned on.

14. A switched capacitor voltage converter comprising a switched capacitor voltage conversion circuit according to any of claims 1-13.