A switched capacitor converter with adjustable output

Abstract

The present invention relates to a switched capacitor converter with adjustable output, belonging to the field of power electronics and integrated circuits, comprising: a plurality of switched capacitor converter modules cascaded in sequence, with a coupling capacitor connected between any two adjacent switched capacitor converter modules; wherein each switched capacitor converter module is provided with a switching switch tube, which inputs a clock control signal; and each switched capacitor converter module controls the switching switch tube by the duty cycle of the clock control signal to adjust the output ratio. In the switched capacitor converter with adjustable output of the present invention, the switching switch tube is controlled by the clock control signal, and the purpose of adjusting the output ratio can be achieved by only adjusting the duty cycle of the clock control signal to control the switching of the switching switch tube. The present invention has the advantages of miniaturization and lightweight, and can simultaneously achieve two different output ratios. The control method is simple, easy to operate, and also convenient for expansion and cascading between switched capacitor converter modules.

Description

Technical Field

[0001] The present invention belongs to the field of power electronics and integrated circuits, and in particular relates to a switched capacitor converter with adjustable output. Background Art

[0002] The rapid development of emerging fields such as wearable devices, automotive energy, and renewable energy generation has placed higher demands on power supply systems. Miniaturization, lightweight design, high efficiency, and low electromagnetic interference (EMI) have become key development directions for power supply systems. Switching capacitor converters (SCCs) are typical non-magnetic converters consisting solely of capacitors and power switches. This structure offers advantages such as small size, light weight, high efficiency, high power density, and low EMI. Compared to inductors, capacitors are easier to integrate, offering significant advantages in miniaturization and integration. Due to their unique advantages, switched capacitor converters have found widespread application in these emerging fields. In particular, in low-power, non-isolated DC-DC applications, switched capacitor converters have experienced rapid development and have become a significant research hotspot.

[0003] Existing switched-capacitor converters can typically only achieve voltage changes with fixed ratios. The most direct way to adjust the conversion ratio of a switched-capacitor converter is to reroute the circuit using a large number of switches. This solution has high conversion costs, so a more common approach is to cascade a switched-capacitor converter with a traditional converter. For example, a buck converter can be cascaded with a switched-capacitor converter, with the switched-capacitor converter being regulated using the traditional converter's control. Combining the two conversion stages of a buck converter and a switched-capacitor converter can also achieve the purpose of adjusting the conversion ratio, but large inductors are still present in the circuit.

[0004] Existing switched-capacitor converters mostly operate in a single mode with a fixed ratio, or require a large number of switches to achieve a ratio change. The use of a large number of switches or large inductors in the circuit violates the original design principles of the switched-capacitor converter, which are miniaturization and integration. Therefore, a switched-capacitor converter with adjustable output is needed. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a switched capacitor converter with adjustable output. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] The present invention provides a switched capacitor converter with adjustable output, comprising: a plurality of switched capacitor converter modules cascaded in sequence, with a coupling capacitor connected between any two adjacent switched capacitor converter modules; wherein each of the switched capacitor converter modules is provided with a switching tube, and the switching tube inputs a clock control signal; each of the switched capacitor converter modules controls the switching tube by the duty cycle of the clock control signal to adjust the output transformation ratio.

[0007] In one embodiment of the present invention, the switching transistor is an NMOS transistor.

[0008] In one embodiment of the present invention, each of the switched capacitor converter modules includes an NMOS transistor M1 , which serves as the switching transistor and inputs the clock control signal.

[0009] In one embodiment of the present invention, each of the switched capacitor converter modules further includes: an NMOS transistor MN1, an NMOS transistor MN2, an NMOS transistor MN3, a diode DN1, a diode DN2, a diode DN3, a capacitor CN1, a capacitor CN2, and a capacitor CN3; wherein the drain end of the NMOS transistor MN1 is connected to the positive electrode of the input power supply VCC, the source end of the NMOS transistor MN1 is respectively connected to the drain end of the NMOS transistor MN3 and the first plate of the capacitor CN1; the drain end of the NMOS transistor MN2 is respectively connected to the second plate of the capacitor CN1 and the NMOS transistor M1. The source terminal of the NMOS transistor MN2 is connected to the negative electrode of the input power supply VCC; the drain terminal of the NMOS transistor M1 is respectively connected to the source terminal of the NMOS transistor MN3, the cathode of the diode DN1 and the first plate of the capacitor CN3; the anode of the diode DN1 is respectively connected to the first plate of the capacitor CN2 and the cathode of the diode DN2; the anode of the diode DN2 is respectively connected to the second plate of the capacitor CN3 and the cathode of the diode DN3; the source terminal of the NMOS transistor MN2, the second plate of the capacitor CN2 and the anode of the diode DN3 are all grounded.

[0010] In one embodiment of the present invention, the output-adjustable switched capacitor converter further includes: a resistor Ro, a capacitor Co, and an inductor Lo; the resistor Ro, the capacitor Co, and the inductor Lo are respectively connected to the last switched capacitor converter module in a plurality of cascaded switched capacitor converter modules; wherein, the first end of the inductor Lo is connected to the drain end of the NMOS transistor M1; the second end of the inductor Lo is respectively connected to the first plate of the capacitor Co and the first end of the resistor Ro; the second plate of the capacitor Co and the second end of the resistor Ro are both grounded.

[0011] In one embodiment of the present invention, the NMOS transistor MN1 inputs a first PWM control signal, and the NMOS transistors MN2 and MN3 both input a second PWM control signal; wherein the first PWM control signal and the second PWM control signal have the same frequency and complementary timing.

[0012] In one embodiment of the present invention, the duty cycle of the first PWM control signal and the second PWM control signal are both 50%.

[0013] In one embodiment of the present invention, the output transformation ratio of the switched capacitor converter module is 2:1 or 3:1.

[0014] In one embodiment of the present invention, when the duty cycle of the clock control signal is (0, 0.5], the output transformation ratio of the switched capacitor converter module is 2:1.

[0015] In one embodiment of the present invention, when the duty cycle of the clock control signal is (0.5, 1], the output transformation ratio of the switched capacitor converter module is 3:1.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The output-adjustable switched capacitor converter of the present invention controls the switching switch tube by a clock control signal. The purpose of adjusting the output ratio can be achieved by simply adjusting the duty cycle of the clock control signal to control the switching of the switching switch tube. The present invention has the advantages of miniaturization and lightweight, and can achieve two different output ratios at the same time. The control method is simple, easy to operate, and also convenient for expansion and cascading between switched capacitor converter modules.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is a schematic structural diagram of a switched capacitor converter with adjustable output according to an embodiment of the present invention;

[0020] Figure 2 1 is a schematic structural diagram of a switched capacitor converter module provided by an embodiment of the present invention;

[0021] Figure 3 This is an equivalent circuit structure diagram of the switched capacitor converter module provided by an embodiment of the present invention in a 2:1 operating mode;

[0022] Figure 4This is a timing diagram of the gating operation of the switched capacitor converter module provided by an embodiment of the present invention in a 2:1 operating mode;

[0023] Figure 5 This is an equivalent circuit structure diagram of the switched capacitor converter module provided by an embodiment of the present invention in a 3:1 working mode;

[0024] Figure 6 This is a timing diagram of the gating operation of the switched capacitor converter module provided by an embodiment of the present invention in a 3:1 operating mode. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description of an output adjustable switched capacitor converter proposed in accordance with the present invention in conjunction with the accompanying drawings and specific embodiments.

[0026] The aforementioned and other technical contents, features, and effects of the present invention are clearly presented in the following detailed description of the specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a deeper and more specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are provided for reference and illustration purposes only and are not intended to limit the technical solutions of the present invention.

[0027] Example 1

[0028] In order to meet the requirements of miniaturization and integration of switched capacitor converters in power supply systems and avoid the use of large inductors, while also avoiding the use of a large number of switches for switching, this embodiment provides a switched capacitor converter with adjustable output, such as Figure 1 and Figure 2 As shown, Figure 1 1 is a schematic structural diagram of a switched capacitor converter with adjustable output according to an embodiment of the present invention; Figure 2 Schematic diagram of the structure of the switched capacitor converter module provided by an embodiment of the present invention.

[0029] The output-adjustable switched capacitor converter of this embodiment includes: a plurality of switched capacitor converter modules cascaded in sequence, with a coupling capacitor connected between any two adjacent switched capacitor converter modules; wherein each switched capacitor converter module is provided with a switching transistor, which inputs a clock control signal; each switched capacitor converter module controls the switching transistor by the duty cycle of the clock control signal to adjust the output transformation ratio.

[0030] Exemplarily, the output transformation ratio of the switched capacitor converter module is 2:1 or 3:1.

[0031] The principle is to use three cascaded switched capacitor converter modules as an example: the first and second switched capacitor converter modules are connected in cascade via coupling capacitor Co1, and the second and third switched capacitor converter modules are connected in cascade via coupling capacitor Co2. The input of the previous switched capacitor converter module serves as the output of the next switched capacitor converter module. The circuit structure of the three cascaded switched capacitor converter modules remains consistent, and each single switched capacitor converter module can achieve an output transformation ratio for the DC-DC input power supply, namely, transforming the output voltage of the DC-DC input power supply into an output voltage at a ratio of 2:1 or 3:1. Each switched capacitor converter module is equipped with a switching transistor. Each switching transistor in each switched capacitor converter module is controlled by a separate clock control signal. By adjusting the duty cycle of the clock control signal, the switching transistor switches, achieving different output transformation ratios. In other words, two different output ratios can be achieved simply by controlling key hardware—that is, by controlling the duty cycle of the clock control signal input to the switching transistor.

[0032] In this embodiment, the switching transistor is an NMOS transistor. Specifically, each switched capacitor converter module includes an NMOS transistor M1, which serves as a switching transistor and inputs a clock control signal.

[0033] like Figure 2 As shown, in this embodiment, each switched capacitor converter module further includes: an NMOS transistor MN1, an NMOS transistor MN2, an NMOS transistor MN3, a diode DN1, a diode DN2, a diode DN3, a capacitor CN1, a capacitor CN2 and a capacitor CN3;

[0034] The drain terminal of the NMOS transistor MN1 is connected to the positive electrode of the input power supply VCC, and the source terminal of the NMOS transistor MN1 is respectively connected to the drain terminal of the NMOS transistor MN3 and the first plate of the capacitor CN1; the drain terminal of the NMOS transistor MN2 is respectively connected to the second plate of the capacitor CN1 and the source terminal of the NMOS transistor M1, and the source terminal of the NMOS transistor MN2 is connected to the negative electrode of the input power supply VCC; the drain terminal of the NMOS transistor M1 is respectively connected to the source terminal of the NMOS transistor MN3, the cathode of the diode DN1, and the first plate of the capacitor CN3; the anode of the diode DN1 is respectively connected to the first plate of the capacitor CN2 and the cathode of the diode DN2; the anode of the diode DN2 is respectively connected to the second plate of the capacitor CN3 and the cathode of the diode DN3; the source terminal of the NMOS transistor MN2, the second plate of the capacitor CN2, and the anode of the diode DN3 are all grounded.

[0035] Further, such as Figure 1 and Figure 2As shown, the output-adjustable switched capacitor converter of this embodiment further includes: a resistor Ro, a capacitor Co, and an inductor Lo; the resistor Ro, capacitor Co, and inductor Lo are respectively connected to the last switched capacitor converter module in a plurality of cascaded switched capacitor converter modules; wherein the first end of the inductor Lo is connected to the drain terminal of the NMOS transistor M1; the second end of the inductor Lo is respectively connected to the first plate of the capacitor Co and the first end of the resistor Ro; the second plate of the capacitor Co and the second end of the resistor Ro are both grounded. Exemplarily, the resistor Ro is a virtual load, which can be implemented using a resistor or other resistive device, such as a load that appears as a resistor.

[0036] For example, the diode DN1 and the diode DN2 can also be set as a switch tube, but since more control timings need to be added after adding the switch tube, as in this embodiment, Figure 2 The circuit structure of the switched capacitor converter module shown in FIG is a preferred implementation.

[0037] It is worth noting that the output-adjustable switched capacitor converter of this embodiment realizes voltage conversion by alternating charging and discharging of capacitors and switching tubes. This conversion method avoids the magnetic energy conversion process in traditional transformers, thereby reducing energy loss. Compared with traditional voltage conversion devices based on resistor divider, transformer conversion, low-dropout linear regulator (Low-dropout Regulator, LDO), etc., the efficiency of voltage conversion is improved.

[0038] Since magnetic components easily cause magnetic field changes during the switching process, electromagnetic interference is generated. In this embodiment, magnetic components such as inductors and transformers are removed from the switched capacitor converter module, thereby reducing the electromagnetic interference that these components may generate. In contrast, the switched capacitor converter module of this embodiment mainly relies on capacitors and switching tubes for voltage conversion, and the electromagnetic interference generated by these components is also relatively small. In addition, it should be noted that after several switched capacitor converter modules are cascaded, an inductor Lo is provided at the output end of the last switched capacitor converter module to smooth the output and reduce voltage ripple. Since the inductor only plays the role of smoothing the output, its size is also relatively small. Capacitors CN1, CN2 and CN3 are all used for charging and discharging the flying capacitor; capacitor Co is used for inter-stage decoupling and voltage stabilization, and enhances the stability of the circuit through filtering.

[0039] Exemplarily, the NMOS transistor MN1 inputs a first PWM control signal, and the NMOS transistors MN2 and MN3 both input a second PWM control signal; wherein the first PWM (Pulse Width Modulation) control signal and the second PWM control signal have the same frequency and complementary timing.

[0040] Exemplarily, the duty cycle of the first PWM control signal and the second PWM control signal are both 50%.

[0041] It can be understood that, in the plurality of switched capacitor converter modules cascaded in sequence, the switching transistors include: NMOS transistor MN1, NMOS transistor MN2 and NMOS transistor MN3, and the NMOS transistor MN1 in each switched capacitor converter module is controlled by the first PWM control signal, and the NMOS transistor MN2 and NMOS transistor MN3 in each switched capacitor converter module are controlled by the second PWM control signal.

[0042] like Figure 3 As shown, Figure 3 This is an equivalent circuit structure diagram of the switched capacitor converter module provided by an embodiment of the present invention in a 2:1 working mode.

[0043] When the duty cycle of the clock control signal is (0, 0.5], the output ratio of the switched capacitor converter module is 2:1, that is, the voltage output by the switched capacitor converter module is 1 / 2 of the output voltage of the input power supply.

[0044] For ease of understanding, the switched capacitor converter module working alone is taken as an example, and the output end of the switched capacitor converter module is respectively connected to a resistor Ro, a capacitor Co, and an inductor Lo.

[0045] Specifically, the equivalent circuit structure of the switched capacitor converter module of this embodiment in the 2:1 working mode is as follows: the NMOS tube M1 is equivalent to the diode D1, the source end of the NMOS tube M1 is the anode of the diode D1, and the drain end of the NMOS tube M1 is the cathode of the diode D1; the drain end of the NMOS tube MN1 is connected to the positive electrode of the input power supply VCC, the source end of the NMOS tube MN1 is respectively connected to the drain end of the NMOS tube MN3 and the first plate of the capacitor CN1; the drain end of the NMOS tube MN2 is respectively connected to the second plate of the capacitor CN1 and the anode of the diode D1, and the source end of the NMOS tube MN2 is connected to the positive electrode of the input power supply VCC. The cathode of the diode D1 is respectively connected to the source terminal of the NMOS transistor MN3, the cathode of the diode DN1, the first plate of the capacitor CN3 and the first end of the inductor Lo; the anode of the diode DN1 is respectively connected to the first plate of the capacitor CN2 and the cathode of the diode DN2; the anode of the diode DN2 is respectively connected to the second plate of the capacitor CN3 and the cathode of the diode DN3; the second end of the inductor Lo is respectively connected to the first plate of the capacitor Co and the first end of the resistor Ro; the source terminal of the NMOS transistor MN2, the second plate of the capacitor CN2, the anode of the diode DN3, the second plate of the capacitor Co and the second end of the resistor Ro are all grounded.

[0046] Further, such as Figure 4 As shown, Figure 4This is a timing diagram of the gating operation of the switched capacitor converter module provided by an embodiment of the present invention in a 2:1 operating mode.

[0047] The gate switches of the switched capacitor converter module of this embodiment in the 2:1 operating mode include: NMOS transistors MN1, MN2, MN3, and M1. NMOS transistor MN1 is controlled by a first PWM control signal, while NMOS transistors MN2 and MN3 are both controlled by a second PWM control signal. The first and second PWM control signals have the same frequency and complementary timing, and are both provided by an external isolated driver chip. The duty cycle of the first and second PWM control signals is 50%. NMOS transistor M1 is controlled by a clock control signal, and its duty cycle is (0, 0.5).

[0048] like Figure 5 As shown, Figure 5 This is an equivalent circuit structure diagram of the switched capacitor converter module provided by an embodiment of the present invention in a 3:1 working mode.

[0049] When the duty cycle of the clock control signal is (0.5, 1], the output ratio of the switched capacitor converter module is 3:1, that is, the voltage output by the switched capacitor converter module is 1 / 3 of the output voltage of the input power supply.

[0050] Similarly, for ease of understanding, the output ends of the switched capacitor converter module are respectively connected to a resistor Ro, a capacitor Co, and an inductor Lo. Specifically, the equivalent circuit structure of the switched capacitor converter module of this embodiment in the 3:1 working mode is as follows: the NMOS tube M1 is equivalent to a wire, and the two ends of the wire are respectively connected to the second plate of the capacitor CN1 and the source end of the NMOS tube MN3; the drain end of the NMOS tube MN1 is connected to the positive electrode of the input power supply VCC, and the source end of the NMOS tube MN1 is respectively connected to the drain end of the NMOS tube MN3 and the first plate of the capacitor CN1; the drain end of the NMOS tube MN2 is connected to the second plate of the capacitor CN1, and the source end of the NMOS tube MN2 is connected to the negative electrode of the input power supply VCC; The source terminal of the transistor MN3 is respectively connected to the cathode of the diode DN1, the first plate of the capacitor CN3, and the first end of the inductor Lo; the anode of the diode DN1 is respectively connected to the first plate of the capacitor CN2 and the cathode of the diode DN2; the anode of the diode DN2 is respectively connected to the second plate of the capacitor CN3 and the cathode of the diode DN3; the second end of the inductor Lo is respectively connected to the first plate of the capacitor Co and the first end of the resistor Ro; the source terminal of the NMOS transistor MN2, the second plate of the capacitor CN2, the anode of the diode DN3, the second plate of the capacitor Co, and the second end of the resistor Ro are all grounded.

[0051] Further, such as Figure 6 As shown, Figure 6This is a timing diagram of the gating operation of the switched capacitor converter module provided by an embodiment of the present invention in a 3:1 operating mode.

[0052] The gate switches of the switched capacitor converter module of this embodiment in the 3:1 operating mode include: NMOS transistors MN1, MN2, MN3, and M1. NMOS transistor MN1 is controlled by a first PWM control signal, while NMOS transistors MN2 and MN3 are both controlled by a second PWM control signal. The first and second PWM control signals have the same frequency and complementary timing, and are both provided by an external isolated driver chip. The duty cycle of the first and second PWM control signals is 50%. NMOS transistor M1 is controlled by a clock control signal, and its duty cycle is (0.5, 1).

[0053] The output-adjustable switched capacitor converter of the present invention controls the switching switch tube by a clock control signal. The purpose of adjusting the output ratio can be achieved by simply adjusting the duty cycle of the clock control signal to control the switching of the switching switch tube. The present invention has the advantages of miniaturization and lightweight, and can achieve two different output ratios at the same time. The control method is simple, easy to operate, and also convenient for expansion and cascading between switched capacitor converter modules.

[0054] It should be noted that, in this document, relational terms such as first and second are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not explicitly listed. Without further limitation, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the article or device comprising the element. Terms such as "connected" or "connected" are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. References to orientations or positional relationships, such as "upper," "lower," "left," and "right," are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate description and simplify the description of the present invention. They do not indicate or imply that the device or element referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limiting the present invention.

[0055] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A switched capacitor converter with adjustable output, characterized in that: include: A plurality of switched capacitor converter modules cascaded in sequence, with a coupling capacitor connected between any two adjacent switched capacitor converter modules; Each of the switched capacitor converter modules is provided with a switching transistor, which inputs a clock control signal; each of the switched capacitor converter modules controls the switching transistor by the duty cycle of the clock control signal to adjust the output transformation ratio; the switching transistor is an NMOS transistor; each of the switched capacitor converter modules includes: an NMOS transistor M1, which serves as the switching transistor and inputs the clock control signal; each of the switched capacitor converter modules also includes: an NMOS transistor MN1, an NMOS transistor MN2, an NMOS transistor MN3, a diode DN1, a diode DN2, a diode DN3, a capacitor CN1, a capacitor CN2, and a capacitor CN3; The drain end of the NMOS transistor MN1 is connected to the positive electrode of the input power supply VCC or the positive output end of the upper-stage switched capacitor converter module, and the source end of the NMOS transistor MN1 is connected to the drain end of the NMOS transistor MN3 and the first plate of the capacitor CN1 respectively; The drain end of the NMOS transistor MN2 is connected to the second plate of the capacitor CN1 and the source end of the NMOS transistor M1 respectively, and the source end of the NMOS transistor MN2 is connected to the negative electrode of the input power supply VCC or the negative output end of the previous stage switched capacitor converter module; The drain end of the NMOS transistor M1 is connected to the source end of the NMOS transistor MN3, the cathode of the diode DN1 and the first plate of the capacitor CN3 respectively; The anode of the diode DN1 is connected to the first plate of the capacitor CN2 and the cathode of the diode DN2 respectively; The anode of the diode DN2 is connected to the second plate of the capacitor CN3 and the cathode of the diode DN3 respectively; The source end of the NMOS transistor MN2, the second electrode plate of the capacitor CN2 and the anode of the diode DN3 are all grounded.

2. The output adjustable switched capacitor converter according to claim 1, characterized in that: The output adjustable switched capacitor converter further includes: a resistor Ro, a capacitor Co and an inductor Lo; The resistor Ro, the capacitor Co, and the inductor Lo are respectively connected to the last switched capacitor converter module in a plurality of switched capacitor converter modules that are cascaded in sequence; The first end of the inductor Lo is connected to the drain end of the NMOS transistor M1; the second end of the inductor Lo is connected to the first plate of the capacitor Co and the first end of the resistor Ro respectively; The second electrode plate of the capacitor Co and the second end of the resistor Ro are both grounded.

3. The output adjustable switched capacitor converter according to claim 1, wherein: The NMOS transistor MN1 inputs a first PWM control signal, and the NMOS transistor MN2 and the NMOS transistor MN3 both input a second PWM control signal; The first PWM control signal and the second PWM control signal have the same frequency and complementary timing.

4. The output adjustable switched capacitor converter according to claim 3, characterized in that: The duty cycle of the first PWM control signal and the second PWM control signal are both 50%.

5. The output adjustable switched capacitor converter according to claim 1, wherein: The output transformation ratio of the switched capacitor converter module is 2:1 or 3:

1.

6. The output adjustable switched capacitor converter according to claim 5, characterized in that: When the duty cycle of the clock control signal is (0, 0.5], the output ratio of the switched capacitor converter module is 2:

1.

7. The output adjustable switched capacitor converter according to claim 5, characterized in that: When the duty cycle of the clock control signal is (0.5, 1], the output ratio of the switched capacitor converter module is 3:1.

Images