Ladder form switched capacitor conversion circuit

Abstract

The utility model relates to a kind of ladder form switch capacitor conversion circuit, conversion circuit includes ladder determination module, switch control module, output capacitor at least one flying capacitor;Current input end is connected with voltage output end in turn through at least two switch tubes, voltage output end is also grounded through output capacitor;One end of flying capacitor is connected between voltage input end and the common point of adjacent two switch tubes of voltage output end, its other end is grounded through a switch tube, and also be connected to the common point of output capacitor and voltage output end through another switch;When the ratio of input voltage and output voltage is non-integer, switch control module controls the charge-discharge process of flying capacitor, so that the voltage of last flying capacitor is equal to output voltage or input voltage.The present application realizes the efficient conversion of fixed integer ratio and / or non-integer ratio of input and output voltage by the switch capacitor control mode of multiple ladder, using the ladder voltage variation of flying capacitor.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and more specifically, to a stepped switched capacitor conversion circuit. Background Technology

[0002] Switched capacitor banks, as highly efficient power conversion devices, are widely used in various power management systems. Their main function is to switch between different voltage levels to meet the power supply needs of various electronic devices. Traditional switched capacitor banks typically use a fixed duty cycle control method, such as the common use of two 50% duty cycle PWM pulse width modulation signals to achieve voltage conversion. This traditional method has many limitations in practical applications. For example, it is difficult to flexibly adjust non-integer proportional voltage regulation, requiring complex circuit transformations and additional design work. Moreover, it is difficult to achieve ideal regulation accuracy and efficiency, resulting in limited overall performance. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a stepped switched capacitor conversion circuit, which addresses the above-mentioned shortcomings of the prior art in achieving non-integer proportional voltage regulation.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to provide a stepped switched capacitor conversion circuit, including a stepped determination module, a switch control module, an output capacitor Cout and at least one flying capacitor C;

[0005] The current input terminal is connected to the voltage output terminal in sequence through at least two switching transistors, and the voltage output terminal is also grounded through the output capacitor Cout;

[0006] One end of the flying capacitor C is connected to the common point of two adjacent switching transistors between the voltage input terminal and the voltage output terminal, and the other end is grounded through a switching transistor and connected to the common point of the output capacitor and the voltage output terminal through another switch.

[0007] When the ratio of the input voltage to the output voltage is not an integer, the switch control module controls the charging and discharging process of the flying capacitor C, so that the voltage of the last flying capacitor is equal to the output voltage or the input voltage.

[0008] In one embodiment, when the ratio of the input voltage to the output voltage is an integer, the switch control module controls the charging and discharging process of the flying capacitors so that the voltage difference between adjacent flying capacitors is equal to the output voltage or the input voltage.

[0009] In one embodiment, it includes a first flying capacitor C1, a first switching transistor SW1, a second switching transistor SW2, a third switching transistor SW3, a fourth switching transistor SW4, and an output capacitor Cout connected to the first flying capacitor C1 and ground.

[0010] The current output terminal and the current output terminal are connected in sequence through the first switch SW1 and the fourth switch SW4. One end of the first flying capacitor C1 is connected between the first switch SW1 and the fourth switch SW4, and the other end is grounded through the second switch SW2 and connected to the common point of the current output terminal and the output capacitor Cout through the third switch SW3.

[0011] The switch control module is connected to the control terminals of the first switch tube SW1, the second switch tube SW2, the third switch tube SW3, and the fourth switch tube SW4, respectively.

[0012] In one example, it also includes a second flying capacitor C2, a fifth switch SW5, a sixth switch SW6, and a seventh switch SW7;

[0013] The fourth switch SW4 is connected to the current output terminal through the seventh switch SW7. One end of the second flying capacitor C2 is connected to the common point of the fourth switch SW4 and the seventh switch SW7, and the other end is grounded through the fifth switch SW5 and connected to the common point of the current output terminal and the output capacitor Cout through the sixth switch SW6.

[0014] The switch control module is connected to the control terminals of the fifth switch SW5, the sixth switch SW6, and the seventh switch SW7, respectively.

[0015] In one embodiment, it also includes a third flying capacitor C3, an eighth switch SW8, a ninth switch SW9, and a tenth switch SW10;

[0016] The seventh switch SW7 is connected to the current output terminal through the tenth switch SW10. One end of the third flying capacitor C3 is connected to the common point of the seventh switch SW7 and the tenth switch SW10, and the other end is grounded through the eighth switch SW8 and connected to the common point of the current output terminal and the output capacitor Cout through the ninth switch SW9.

[0017] The switch control module is connected to the control terminals of the eighth switch SW8, the ninth switch SW9, and the tenth switch SW10, respectively.

[0018] In one embodiment, the switch control module controls the charging process and voltage balancing process of the flyover capacitor, so that the voltage of the output capacitor Cout is stably equal to the output voltage.

[0019] In one embodiment, the number of steps is four;

[0020] The flying capacitor operates within each control cycle:

[0021] First working state: The first switch SW1, the third switch SW3, the fifth switch SW5, the seventh switch SW7, and the ninth switch SW9 are turned on respectively, and the second switch SW2, the fourth switch SW4, the sixth switch SW6, the eighth switch SW8, and the tenth switch SW10 are turned off respectively.

[0022] Second working state: control the second switch SW2, the fourth switch SW4 and the sixth switch SW6 to be turned on respectively, and control the first switch SW1, the third switch SW3, the fifth switch SW5, the seventh switch SW7, the eighth switch SW8, the ninth switch SW9 and the tenth switch SW10 to be turned off respectively;

[0023] Third working state: control the second switch SW2, the fourth switch SW4, the sixth switch SW6, the eighth switch SW8, and the tenth switch SW10 to be turned on respectively, and control the first switch SW1, the third switch SW3, the fifth switch SW5, the seventh switch SW7, and the ninth switch SW9 to be turned off respectively;

[0024] Fourth operating state: Control the fifth switch SW5, the seventh switch SW7 and the ninth switch SW9 to be turned on, and control the first switch SW1, the second switch SW2, the third switch SW3, the fourth switch SW4, the sixth switch SW6, the eighth switch SW8 and the tenth switch SW10 to be turned off.

[0025] The flying capacitor charging process is achieved by controlling the first working state; the flying capacitor voltage balancing process is achieved by controlling the second working state, the third working state, and the fourth working state, wherein the execution order of the first working state, the second working state, the third working state, and the fourth working state can be arbitrarily adjusted.

[0026] In one embodiment, the switching transistor is any one of a silicon-based MOSFET device, a silicon carbide device, or a gallium nitride device.

[0027] In one embodiment, the switch control module includes:

[0028] A PWM generator is used to generate pulse width modulation signals to control the on and off states of each switching transistor.

[0029] The beneficial effects of this utility model are as follows: This application provides a stepped switched capacitor conversion circuit, including a step determination module, a switch control module, an output capacitor Cout, and at least one flying capacitor; the current input terminal is sequentially connected to the voltage output terminal through at least two switching transistors, and the voltage output terminal is also grounded through the output capacitor Cout; one end of the flying capacitor is connected to the common point of two adjacent switching transistors between the voltage input terminal and the voltage output terminal, and the other end is grounded through a switching transistor and connected to the common point of the output capacitor and the voltage output terminal through another switch; when the ratio of the input voltage to the output voltage is not an integer, the switch control module controls the charging and discharging process of the flying capacitor, so that the voltage of the last flying capacitor is equal to the output voltage or the input voltage. This application, through a multi-step switched capacitor control method, utilizes the stepped voltage change of the flying capacitor to achieve efficient conversion of non-integer ratios of input and output voltages, improving the flexibility and accuracy of voltage conversion. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0031] Figure 1 A schematic diagram of an embodiment of a stepped switched capacitor conversion circuit;

[0032] Figure 2 This is a schematic diagram of another embodiment of a stepped switched capacitor conversion circuit. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0034] like Figure 1 As shown, Figure 1 This is a logic diagram of a stepped switched capacitor switching circuit.

[0035] The technical solution adopted by this utility model to solve its technical problem is as follows: A stepped switched capacitor conversion circuit is constructed, including a step determination module, a switch control module, an output capacitor Cout, and at least one flying capacitor C; the current input terminal is sequentially connected to the voltage output terminal through at least two switching transistors, and the voltage output terminal is also grounded through the output capacitor Cout; one end of the flying capacitor C is connected to the common point of two adjacent switching transistors between the voltage input terminal and the voltage output terminal, and the other end is grounded through a switching transistor and connected to the common point of the output capacitor and the voltage output terminal through another switch; the step determination module is used to determine the number of steps according to the ratio of the input voltage to the output voltage, wherein the number of steps is a positive integer; when the ratio of the input voltage to the output voltage is not an integer, the switch control module controls the charging and discharging process of the flying capacitor C, and determines the voltage difference between adjacent flying capacitors according to the number of steps, the input voltage, and the output voltage, so that the voltage of the last flying capacitor is equal to the output voltage or the input voltage.

[0036] It should be noted that during the process of adding steps, the voltage across the flying capacitor remains constant at the input voltage minus the output voltage. The voltage decreases sequentially at each step until the voltage across the flying capacitor at the last step equals the output voltage. By applying the principle that the voltage of a series capacitor is inversely proportional to its capacitance, adjusting the voltage at different steps allows for precise adjustment of the output voltage relative to the input voltage in a non-integer multiple manner. This satisfies diverse power management needs and enhances the circuit's flexibility and adaptability. Furthermore, it includes at least two switching transistors, and the number of switching transistors can be two or more, and can be odd or even.

[0037] Furthermore, when the ratio of the input voltage to the output voltage is an integer, the switching control module controls the charging and discharging process of the flying capacitors so that the voltage difference between adjacent flying capacitors is equal to the output voltage or the input voltage.

[0038] like Figure 2As shown, further, it includes a first flying capacitor C1, a first switching transistor SW1, a second switching transistor SW2, a third switching transistor SW3, a fourth switching transistor SW4, and an output capacitor Cout connected to the first flying capacitor C1 and ground. The current output terminal is connected sequentially through the first switching transistor SW1 and the fourth switching transistor SW4. One end of the first flying capacitor C1 is connected between the first switching transistor SW1 and the fourth switching transistor SW4, and its other end is grounded through the second switching transistor SW2 and connected to the common point of the current output terminal and the output capacitor Cout through the third switching transistor SW3. The switch control module is connected to the control terminals of the first switching transistor SW1, the second switching transistor SW2, the third switching transistor SW3, and the fourth switching transistor SW4, respectively.

[0039] When the ratio of input voltage to output voltage is not an integer, the switching control module controls the charging and discharging process of the flying capacitors. It determines the voltage difference between adjacent flying capacitors based on the number of steps, input voltage, and output voltage, and adjusts the charging and discharging time ratio of each flying capacitor to make the voltage of output capacitor Cout equal to the output voltage.

[0040] It should be noted that when the input-output voltage change ratio is 2, the voltage across the first flying capacitor C1 is always equal to the input voltage minus the output voltage. When the capacitance of the first flying capacitor C1 is equal to that of the output capacitor Cout, the voltage across Cout will stabilize at half of the input voltage. By adjusting the capacitance ratio of the first flying capacitor C1 and Cout, the voltage across Cout can be made higher than or equal to half of the input voltage, thus achieving initial regulation of the output voltage. To achieve more precise voltage control and current balance, a switching transistor and an auxiliary capacitor are introduced into the circuit, which together affect the charging and discharging process of C1 and Cout.

[0041] This single-step circuit design is particularly suitable for scenarios with around two steps. When a larger voltage variation range needs to be handled, the circuit can be expanded by adding more steps. In a multi-step design, each new step introduces a new flying capacitor, while the voltage across C1 remains the input voltage minus the output voltage. As the number of steps increases, the voltage of each subsequent step gradually decreases until the voltage across the flying capacitor of the last step equals the output voltage, thus achieving voltage conversion.

[0042] To achieve a non-integer multiple of the output voltage, the circuit design utilizes the characteristic of series capacitors: the voltage distribution across a series capacitor is inversely proportional to its capacitance. By adjusting the capacitance ratio of the flying capacitors in different steps, the voltage value of each step can be changed, thus making the output voltage a non-integer multiple of the input voltage. This design not only improves the flexibility of voltage regulation but also ensures efficient circuit operation in various application scenarios.

[0043] Furthermore, the stepped switched capacitor switching circuit also includes a second flying capacitor C2, a fifth switch SW5, a sixth switch SW6, and a seventh switch SW7;

[0044] The fourth switch SW4 is connected to the current output terminal through the seventh switch SW7. One end of the second flying capacitor C2 is connected to the common point of the fourth switch SW4 and the seventh switch SW7, and the other end is grounded through the fifth switch SW5 and connected to the common point of the current output terminal and the output capacitor Cout through the sixth switch SW6.

[0045] The switch control module is connected to the control terminals of the fifth switch SW5, the sixth switch SW6, and the seventh switch SW7, respectively.

[0046] Furthermore, the stepped switched capacitor conversion circuit also includes a third flying capacitor C3, an eighth switch SW8, a ninth switch SW9, and a tenth switch SW10.

[0047] The seventh switch SW7 is connected to the current output terminal through the tenth switch SW10. One end of the third flying capacitor C3 is connected to the common point of the seventh switch SW7 and the tenth switch SW10, and the other end is grounded through the eighth switch SW8 and connected to the common point of the current output terminal and the output capacitor Cout through the ninth switch SW9.

[0048] The switch control module is connected to the control terminals of the eighth switch SW8, the ninth switch SW9, and the tenth switch SW10, respectively.

[0049] Furthermore, the switching control module controls the charging process and voltage balancing process of the flyback capacitor, so that the voltage of the output capacitor Cout is stably equal to the output voltage.

[0050] Furthermore, the number of steps is four;

[0051] The flying capacitor executes in each control cycle:

[0052] First working state: Control the first switch SW1, the third switch SW3, the fifth switch SW5, the seventh switch SW7, and the ninth switch SW9 to be turned on, and control the second switch SW2, the fourth switch SW4, the sixth switch SW6, the eighth switch SW8, and the tenth switch SW10 to be turned off.

[0053] Second working state: control the second switch SW2, the fourth switch SW4 and the sixth switch SW6 to be turned on respectively, and control the first switch SW1, the third switch SW3, the fifth switch SW5, the seventh switch SW7, the eighth switch SW8, the ninth switch SW9 and the tenth switch SW10 to be turned off respectively;

[0054] Third working state: control the second switch SW2, the fourth switch SW4, the sixth switch SW6, the eighth switch SW8, and the tenth switch SW10 to be turned on respectively, and control the first switch SW1, the third switch SW3, the fifth switch SW5, the seventh switch SW7, and the ninth switch SW9 to be turned off respectively.

[0055] Fourth operating state: Control the fifth switch SW5, the seventh switch SW7 and the ninth switch SW9 to be turned on respectively, and control the first switch SW1, the second switch SW2, the third switch SW3, the fourth switch SW4, the sixth switch SW6, the eighth switch SW8 and the tenth switch SW10 to be turned off respectively;

[0056] The charging process of the flying capacitor is achieved by controlling the first working state; the voltage balancing process of the flying capacitor is achieved by controlling the second, third and fourth working states. The execution order of the first, second, third and fourth working states can be arbitrarily adjusted.

[0057] In one specific embodiment, the step voltages of N flying capacitors are obtained by switching the transistor on and off. If the step voltages are ideal integers, the flying capacitors are equal, and the voltage difference between adjacent steps is Vout. The output voltage is:

[0058] Vout = Vin / N;

[0059] The voltage across the capacitor at the first step is:

[0060] VC1 = Vin - Vout, where VC1 is the voltage of the first flying capacitor, Vin is the input voltage, and Vout is the output voltage.

[0061] The voltage across the capacitor at the second step is:

[0062] VC2 = Vin - 2 * Vout, where VC2 is the voltage of the first flying capacitor, Vin is the input voltage, and Vout is the output voltage.

[0063] The voltage across the capacitor at the m-th step is:

[0064] VCm = Vin - m * Vout, where VCm is the voltage of the first flying capacitor, Vin is the input voltage, and Vout is the output voltage.

[0065] The voltage across the nth flying capacitor on the last step is:

[0066] VCn = Vout, where VCn is the voltage of the first flying capacitor, Vin is the input voltage, and Vout is the output voltage.

[0067] In one embodiment, the preset number is 1. If the output voltage and input voltage are both integers, in the first case, the input voltage is greater than the output voltage, and the number of steps is the quotient of the input voltage divided by the output voltage (rounded down) minus 1. In the second case, the output voltage is greater than the input voltage, and the number of steps is the quotient of the output voltage divided by the input voltage (rounded down) minus 1. The step determination module is responsible for determining the number of steps based on the ratio of the input voltage Vin to the output voltage Vout. When the input is 48V and the output is 12V, the input voltage is greater than the output voltage, and the ratio is 48 / 12 = 4. The number of steps is 4 - 1 = 3. The specific working process is as follows:

[0068] First-stage output: 48-12=36V;

[0069] Second stage output: 48-24=24V;

[0070] The third stage output is 48-36=12V.

[0071] In one embodiment, when the input voltage is greater than the output voltage, the step number is equal to the quotient of the input voltage divided by the output voltage and rounded down, minus 1; when the output voltage is greater than the input voltage, the step number is equal to the quotient of the output voltage divided by the input voltage and rounded down, minus 1.

[0072] In another embodiment, if the ratio of the output voltage to the input voltage is not an integer, the step determination module determines the number of steps based on whether the ratio of the input voltage to the output voltage is rounded down or up. Specifically, when the ratio of the input voltage to the output voltage is not an integer, the step determination module can choose to round down or up to determine the number of steps to adapt to different design requirements and performance requirements.

[0073] When the input is 48V and the output is 10V, the ratio is 48 / 10 = 4.8. The step determination module can choose to round down by 1 or round up by 1 to determine the number of steps. Rounding down by 1: the number of steps is 4 - 1 = 3. It should be noted that when the input voltage is greater than the output voltage, the voltage difference between adjacent voltages = input voltage / N + 1 * output voltage, as shown in Example 12 = 48 / 40. The specific working process is as follows:

[0074] First-stage output: 48-12=36V;

[0075] Second stage output: 48-24=24V;

[0076] Third-stage output: 48-36=12V;

[0077] Rounding up and subtracting 1: The number of steps is 5 - 1 = 4. The specific working process is as follows:

[0078] First-stage output: 48 - 9.6 = 38.4V;

[0079] Second stage output: 48 - 19.2 = 28.8V;

[0080] Third-stage output: 48 - 28.8 = 19.2V;

[0081] Fourth stage output: 48 - 38.4 = 9.6V;

[0082] Meanwhile, to balance the overall voltage and achieve non-integer proportional voltage regulation, the circuit introduces additional switching transistors to consume or store energy. By controlling the on / off state of these transistors, they bear a portion of the voltage drop, thereby balancing the circuit voltage and ensuring that the final output voltage is stable and equal to the set output voltage. This method achieves non-integer proportional voltage regulation with only minimal power loss.

[0083] Furthermore, the switching control module is used to control the on and off times of each switching transistor according to the preset PWM duty cycle in each working state.

[0084] Furthermore, the switching transistor is any one of a silicon-based MOSFET device, a silicon carbide device, or a gallium nitride device.

[0085] In one embodiment, the stepped switched capacitor control circuit basically includes a step determination module, a switch control module, and at least one flying capacitor. One end of the flying capacitor is connected between the current input terminal and the current output terminal, and the other end is grounded through a switch and connected to the current output terminal through another switch. The step determination module determines the number of steps based on the ratio of the input voltage Vin to the output voltage Vout, where the number is a positive integer. The switch control module then controls the on / off state of each switch according to the determined number of steps, thereby regulating the charging and discharging process of the flying capacitor to ensure that the voltage of the last flying capacitor is equal to the output voltage.

[0086] Integer ratio case: When the ratio of the input voltage to the output voltage is an integer, the switching control module controls the charging and discharging process of the flying capacitors so that the voltage difference between adjacent flying capacitors is equal to the output voltage. For example, if the input voltage is 48V and the output voltage is 12V, then the number of steps is 3. In this case, the output voltages of each step are 36V, 24V, and 12V respectively.

[0087] Non-integer ratio case: When the ratio of input voltage to output voltage is not an integer, the step determination module determines the number of steps based on whether the ratio is rounded down or up. The switch control module determines the voltage difference between adjacent flying capacitors based on the number of steps, input voltage, and output voltage, and adjusts the charging and discharging time ratio of each flying capacitor to make the voltage of the output capacitor equal to the output voltage. For example, when the input voltage is 48V and the output voltage is 10V, the ratio is 4.8. In this case, the step determination module can choose to round down and subtract 1 to get 3 steps or round up and subtract 1 to get 4 steps. When rounded down, the output voltages of each step are 36V, 24V, and 12V respectively; where the voltage difference between adjacent steps V = input voltage Vin / number of steps N + 1. When rounded up, the output voltages of each step are 38.4V, 28.8V, 19.2V, and 9.6V respectively.

[0088] To balance the overall voltage and achieve non-integer proportional voltage regulation, the circuit introduces additional switching transistors to consume or store energy. By controlling the on / off state of these transistors, they absorb a portion of the voltage drop, thus balancing the circuit voltage and ensuring the final output voltage stabilizes at the set output voltage. For example, in the non-integer proportional case, by controlling the capacitance value of the flying capacitor, the output voltage at the last step can be stabilized at the set output voltage. This achieves both integer and / or non-integer proportional voltage regulation, ensuring the stability and accuracy of the output voltage.

[0089] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A switched-capacitor converter circuit in the form of a ladder, characterized in that Includes a step determination module, a switch control module, an output capacitor (Cout), and at least one flying capacitor (C); The voltage input terminal is connected to the voltage output terminal in sequence through at least two switching transistors, and the voltage output terminal is also grounded through the output capacitor (Cout); One end of the flying capacitor (C) is connected to the common point of two adjacent switching transistors between the voltage input terminal and the voltage output terminal, and the other end is grounded through a switching transistor and connected to the common point of the output capacitor (Cout) and the voltage output terminal through another switch. When the ratio of the input voltage to the output voltage is not an integer, the switch control module controls the charging and discharging process of the flying capacitor (C) so that the voltage of the last flying capacitor is equal to the output voltage or the input voltage.

2. The stepped switched capacitor conversion circuit according to claim 1, characterized in that, When the ratio of the input voltage to the output voltage is an integer, the switch control module controls the charging and discharging process of the flying capacitors so that the voltage difference between adjacent flying capacitors is equal to the output voltage or the input voltage.

3. The switched-capacitor circuit of claim 1, wherein, It includes a first flying capacitor (C1), a first switching transistor (SW1), a second switching transistor (SW2), a third switching transistor (SW3), a fourth switching transistor (SW4), and an output capacitor (Cout) connected to the first flying capacitor (C1) and ground. The voltage input terminal and the voltage output terminal are connected sequentially through the first switch (SW1) and the fourth switch (SW4). One end of the first flying capacitor (C1) is connected between the first switch (SW1) and the fourth switch (SW4), and the other end is grounded through the second switch (SW2) and connected to the common point of the voltage output terminal and the output capacitor (Cout) through the third switch (SW3). The switch control module is connected to the control terminals of the first switch (SW1), the second switch (SW2), the third switch (SW3), and the fourth switch (SW4), respectively.

4. The switched-capacitor circuit of claim 3, wherein, It also includes the second flying capacitor (C2), the fifth switch (SW5), the sixth switch (SW6), and the seventh switch (SW7). The fourth switch (SW4) is connected to the voltage output terminal through the seventh switch (SW7). One end of the second flying capacitor (C2) is connected to the common point of the fourth switch (SW4) and the seventh switch (SW7), and the other end is grounded through the fifth switch (SW5) and connected to the common point of the voltage output terminal and the output capacitor (Cout) through the sixth switch (SW6). The switch control module is connected to the control terminals of the fifth switch (SW5), the sixth switch (SW6), and the seventh switch (SW7), respectively.

5. The switched-capacitor circuit of claim 4, wherein, It also includes the third flying capacitor (C3), the eighth switch (SW8), the ninth switch (SW9), and the tenth switch (SW10). The seventh switch (SW7) is connected to the voltage output terminal through the tenth switch (SW10). One end of the third flying capacitor (C3) is connected to the common point of the seventh switch (SW7) and the tenth switch (SW10), and the other end is grounded through the eighth switch (SW8) and connected to the common point of the voltage output terminal and the output capacitor (Cout) through the ninth switch (SW9). The switch control module is connected to the control terminals of the eighth switch (SW8), the ninth switch (SW9), and the tenth switch (SW10), respectively.

6. The switched-capacitor circuit of claim 5, wherein, The switch control module controls the charging process and voltage balancing process of the flyover capacitor, so that the voltage of the output capacitor (Cout) is stably equal to the output voltage.

7. The switched-capacitor circuit of claim 6, wherein, When the number of steps is four; The flying capacitor operates within each control cycle: First operating state: The first switch (SW1), the third switch (SW3), the fifth switch (SW5), the seventh switch (SW7), and the ninth switch (SW9) are turned on respectively, and the second switch (SW2), the fourth switch (SW4), the sixth switch (SW6), the eighth switch (SW8), and the tenth switch (SW10) are turned off respectively. Second operating state: Control the second switch (SW2), the fourth switch (SW4) and the sixth switch (SW6) to be turned on respectively, and control the first switch (SW1), the third switch (SW3), the fifth switch (SW5), the seventh switch (SW7), the eighth switch (SW8), the ninth switch (SW9) and the tenth switch (SW10) to be turned off respectively; Third working state: The second switch (SW2), the fourth switch (SW4), the sixth switch (SW6), the eighth switch (SW8), and the tenth switch (SW10) are turned on respectively, and the first switch (SW1), the third switch (SW3), the fifth switch (SW5), the seventh switch (SW7), and the ninth switch (SW9) are turned off respectively; Fourth operating state: Control the fifth switch (SW5), the seventh switch (SW7), and the ninth switch (SW9) to be turned on respectively, and control the first switch (SW1), the second switch (SW2), the third switch (SW3), the fourth switch (SW4), the sixth switch (SW6), the eighth switch (SW8), and the tenth switch (SW10) to be turned off respectively; The flying capacitor charging process is achieved by controlling the first working state; the flying capacitor voltage balancing process is achieved by controlling the second working state, the third working state, and the fourth working state, wherein the execution order of the first working state, the second working state, the third working state, and the fourth working state can be arbitrarily adjusted.

8. The switched-capacitor circuit of claim 7, wherein, The switch tube is any one of a silicon-based MOSFET device, a silicon carbide device or a gallium nitride device.

9. The switched-capacitor circuit of claim 8, wherein, The switch control module comprises: A PWM generator is configured to generate a pulse width modulation signal to control the turn-on and turn-off of each switch tube.

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