Switched capacitor converter and chip

Abstract

The embodiment of the present application discloses a switched capacitor converter and chip, and the switched capacitor converter of one aspect of the present application comprises an input switch, a filter capacitor, an output capacitor, a first switched capacitor branch comprising a first switch, a first capacitor, a third switch and a fourth switch, a second switched capacitor branch comprising a fifth switch, a second capacitor, a seventh switch and an eighth switch, a third switched capacitor branch comprising a ninth switch, a tenth switch, a third capacitor, an eleventh switch and a twelfth switch, and a fourth switched capacitor branch comprising a thirteenth switch, a fourteenth switch, a fourth capacitor, a fifteenth switch and a sixteenth switch, and voltage conversion between an input voltage and an output voltage is realized by controlling the switches. In the above manner, the embodiment of the present application can reduce the use of switch tubes on the basis of realizing 4:1 voltage conversion, and reduce the hardware cost.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of electronic technology, and in particular to a switched capacitor converter and chip. Background Technology

[0002] In recent years, with the increasing power consumption of mobile systems (e.g., smartphones, tablets, etc.) and the decreasing operating voltage of power-consuming components (e.g., chips, related circuits, etc.) in mobile systems, there is an increasing need for converters with a voltage conversion ratio (i.e., the ratio of input voltage to output voltage) exceeding 2:1.

[0003] Switched-capacitor converters are commonly used in mobile systems as a type of converter with a voltage conversion ratio of 4:1. A switched-capacitor converter is a circuit in which typically at least one capacitor and at least one semiconductor switching element (hereinafter referred to as a "switch" for ease of description) are combined without the use of an inductor. A switched-capacitor converter can be understood as a circuit used to change the relationship between an input voltage and an output voltage by altering the electrical connection to one or more capacitors through the on / off operation of at least one switch.

[0004] With a voltage conversion ratio of 4:1, such as in a traditional Doubler switched-capacitor converter, the increased voltage stress on the switches and capacitors, as well as the increased number of components, leads to a larger size and higher hardware costs. Summary of the Invention

[0005] The main technical problem solved by the embodiments of the present invention is to provide a switched capacitor converter and chip that can minimize the number of control switches, thereby reducing the size of the switched capacitor converter and reducing hardware costs.

[0006] To solve the above-mentioned technical problems, one technical solution adopted in this invention is: providing a switched-capacitor converter, comprising: a first switched-capacitor branch including a first switch, a first capacitor, a third switch, and a fourth switch, wherein the first terminal of the first switch receives an input voltage, the second terminal of the first switch is connected to the first terminal of the first capacitor, the second terminal of the first capacitor is connected to the second terminal of the third switch and the first terminal of the fourth switch, and the second terminal of the fourth switch is connected to ground; a second switched-capacitor branch including a fifth switch, a second capacitor, a seventh switch, and an eighth switch, wherein the first terminal of the fifth switch receives an input voltage, the second terminal of the fifth switch is connected to the first terminal of the second capacitor, the second terminal of the second capacitor is connected to the second terminal of the seventh switch and the first terminal of the eighth switch, and the second terminal of the eighth switch is connected to ground; and a third switched-capacitor branch including a ninth switch, a tenth switch, a third capacitor, an eleventh switch, and a twelfth switch, wherein the first terminal of the ninth switch is connected to... The circuit includes a fourth switch-capacitor branch comprising a thirteenth switch, a fourteenth switch, a fourth capacitor, a fifteenth switch, and a sixteenth switch. The first terminal of the thirteenth switch is connected to the first terminal of the seventh switch and the second terminal of the first switch. The second terminal of the thirteenth switch is connected to the first terminal of the fourth capacitor and the first terminal of the fourteenth switch. The second terminal of the fourteenth switch is connected to the first terminal of the fifteenth switch. The second terminal of the fifteenth switch is connected to the second terminal of the fourth capacitor and the first terminal of the sixteenth switch. The second terminal of the sixteenth switch is connected to ground. The first terminals of the eleventh and fifteenth switches are output voltage terminals.

[0007] In some embodiments of this application, the switched capacitor converter further includes: an input switch, a first terminal of which receives an input voltage, and a second terminal of which is connected to a first terminal of a first switch and a first terminal of a fifth switch; a filter capacitor, a first terminal of which is connected to a second terminal of the input switch and a second terminal of which is connected to ground; and an output capacitor, a first terminal of which is connected to a second terminal of a tenth switch and a two-fourth switch, and a second terminal of which is connected to ground, and a first terminal of which provides an output voltage.

[0008] In some embodiments of this application, in the first operating mode of the switched capacitor converter, the first, third, eighth, ninth, eleventh, fourteenth, and sixteenth switches are turned on, while the fourth, fifth, seventh, tenth, twelfth, thirteenth, and fifteenth switches are turned off.

[0009] In some embodiments of this application, in the second operating mode of the switched capacitor converter, the fourth, fifth, seventh, tenth, twelfth, thirteenth and fifteenth switches are turned on, while the first, third, eighth, ninth, eleventh, fourteenth and sixteenth switches are turned off.

[0010] To solve the above-mentioned technical problems, another technical solution adopted in this embodiment of the invention is: providing a chip, including: a first switch, a third switch, a fourth switch, a fifth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a thirteenth switch, a fourteenth switch, a fifteenth switch, and a sixteenth switch, wherein the first terminal of the first switch receives an input voltage, the second terminal of the first switch is connected to the first terminal of a first capacitor, the second terminal of the first capacitor is connected to the second terminal of the third switch and the first terminal of the fourth switch, and the second terminal of the fourth switch is connected to ground; the first terminal of the fifth switch receives an input voltage, the second terminal of the fifth switch is connected to the first terminal of a second capacitor, the second terminal of the second capacitor is connected to the second terminal of the seventh switch and the first terminal of the eighth switch, and the second terminal of the eighth switch is connected to ground; the ninth switch... The second terminal is connected to the first terminal of the third switch and the second terminal of the fifth switch; the first terminal of the ninth switch is connected to the first terminal of the third capacitor and the first terminal of the tenth switch; the second terminal of the tenth switch is connected to the first terminal of the eleventh switch; the second terminal of the eleventh switch is connected to the second terminal of the third capacitor and the first terminal of the twelfth switch; the second terminal of the twelfth switch is connected to ground; the first terminal of the thirteenth switch is connected to the first terminal of the seventh switch and the second terminal of the first switch; the second terminal of the thirteenth switch is connected to the first terminal of the fourth capacitor and the first terminal of the fourteenth switch; the second terminal of the fourteenth switch is connected to the first terminal of the fifteenth switch; the second terminal of the fifteenth switch is connected to the second terminal of the fourth capacitor and the first terminal of the sixteenth switch; the second terminal of the sixteenth switch is connected to ground; the first terminals of the eleventh switch and the fifteenth switch are output voltage terminals.

[0011] In some embodiments of this application, in the first operating mode, the first, third, eighth, ninth, eleventh, fourteenth, and sixteenth switches of the chip are turned on, while the fourth, fifth, seventh, tenth, twelfth, thirteenth, and fifteenth switches are turned off.

[0012] In some embodiments of this application, in the second operating mode, the fourth, fifth, seventh, tenth, twelfth, thirteenth and fifteenth switches of the chip are turned on, while the first, third, eighth, ninth, eleventh, fourteenth and sixteenth switches are turned off.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in this invention is: providing a switched-capacitor converter, comprising: a first switched-capacitor branch including a first switch, a second switch, a first capacitor, and a fourth switch, wherein the first terminal of the first switch receives an input voltage, the second terminal of the first switch is connected to the first terminal of the first capacitor and the first terminal of the second switch, the second terminal of the first capacitor is connected to the first terminal of the fourth switch, and the second terminal of the fourth switch is connected to ground; a second switched-capacitor branch including a fifth switch, a sixth switch, a second capacitor, and an eighth switch, wherein the first terminal of the fifth switch receives an input voltage, the second terminal of the fifth switch is connected to the first terminal of the second capacitor and the first terminal of the sixth switch, the second terminal of the second capacitor is connected to the first terminal of the eighth switch, and the second terminal of the eighth switch is connected to ground; and a third switched-capacitor branch including a ninth switch, a tenth switch, a third capacitor, an eleventh switch, and a twelfth switch, wherein the second terminal of the ninth switch is connected to ground. The circuit includes a fourth switch-capacitor branch comprising a thirteenth switch, a fourteenth switch, a fourth capacitor, a fifteenth switch, and a sixteenth switch. The second terminal of the thirteenth switch is connected to the first terminal of the eighth switch and the second terminal of the second switch. The first terminal of the thirteenth switch is connected to the first terminal of the fourth capacitor and the first terminal of the fourteenth switch. The second terminal of the fourteenth switch is connected to the first terminal of the fifteenth switch. The second terminal of the fifteenth switch is connected to the second terminal of the fourth capacitor and the first terminal of the sixteenth switch. The second terminal of the sixteenth switch is connected to ground. The first terminals of the eleventh switch and the fifteenth switch are output voltage terminals.

[0014] In some embodiments of this application, the switched capacitor converter further includes: an input switch, a first terminal of which receives an input voltage, and a second terminal of which is connected to a first terminal of a first switch and a first terminal of a fifth switch; a filter capacitor, a first terminal of which is connected to a second terminal of the input switch and a second terminal of which is connected to ground; and an output capacitor, a first terminal of which is connected to a second terminal of a tenth switch and a two-fourth switch, and a second terminal of which is connected to ground, and a first terminal of which provides an output voltage.

[0015] In some embodiments of this application, in the first operating mode of the switched capacitor converter, the first, sixth, eighth, ninth, eleventh, fourteenth, and sixteenth switches are turned on, while the second, fourth, fifth, tenth, twelfth, thirteenth, and fifteenth switches are turned off.

[0016] In some embodiments of this application, in the second operating mode of the switched capacitor converter, the second, fourth, fifth, tenth, twelfth, thirteenth and fifteenth switches are turned on, while the first, sixth, eighth, ninth, eleventh, fourteenth and sixteenth switches are turned off.

[0017] To solve the above-mentioned technical problems, another technical solution adopted in this embodiment of the invention is: providing a chip, including: a first switch, a second switch, a fourth switch, a fifth switch, a sixth switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a thirteenth switch, a fourteenth switch, a fifteenth switch, and a sixteenth switch, wherein the first terminal of the first switch receives an input voltage, the second terminal of the first switch is connected to the first terminal of a first capacitor and the first terminal of the second switch, the second terminal of the first capacitor is connected to the first terminal of the fourth switch, and the second terminal of the fourth switch is connected to ground; the first terminal of the fifth switch receives an input voltage, the second terminal of the fifth switch is connected to the first terminal of the second capacitor and the first terminal of the sixth switch, the second terminal of the second capacitor is connected to the first terminal of the eighth switch, and the second terminal of the eighth switch is connected to ground; the ninth switch... The first terminal is connected to the first terminal of the fourth switch and the second terminal of the sixth switch; the second terminal of the ninth switch is connected to the first terminal of the third capacitor and the first terminal of the tenth switch; the second terminal of the tenth switch is connected to the first terminal of the eleventh switch; the second terminal of the eleventh switch is connected to the second terminal of the third capacitor and the first terminal of the twelfth switch; the second terminal of the twelfth switch is connected to ground; the first terminal of the thirteenth switch is connected to the first terminal of the eighth switch and the second terminal of the second switch; the second terminal of the thirteenth switch is connected to the first terminal of the fourth capacitor and the first terminal of the fourteenth switch; the second terminal of the fourteenth switch is connected to the first terminal of the fifteenth switch; the second terminal of the fifteenth switch is connected to the second terminal of the fourth capacitor and the first terminal of the sixteenth switch; the second terminal of the sixteenth switch is connected to ground; the first terminals of the eleventh switch and the fifteenth switch are output voltage terminals.

[0018] In some embodiments of this application, in the first operating mode, the first, sixth, eighth, ninth, eleventh, fourteenth, and sixteenth switches of the chip are turned on, while the second, fourth, fifth, tenth, twelfth, thirteenth, and fifteenth switches are turned off.

[0019] In some embodiments of this application, in the second operating mode, the second, fourth, fifth, tenth, twelfth, thirteenth and fifteenth switches of the chip are turned on, while the first, sixth, eighth, ninth, eleventh, fourteenth and sixteenth switches are turned off.

[0020] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of the present invention is to provide an electronic device, including any of the switched capacitor converters as described above, or any of the chips as described above.

[0021] In some embodiments of this application, the electronic device further includes a wireless charging coil, a receiving circuit, and a battery; the wireless charging coil is connected to the receiving circuit, the receiving circuit is connected to a switched capacitor converter or chip to provide input voltage, and the battery is connected to the output voltage terminal.

[0022] In some embodiments of this application, the electronic device further includes a USB interface and a battery. The USB interface is connected to a switched-capacitor converter or chip to provide input voltage, and the battery is connected to the output voltage terminal.

[0023] Unlike existing technologies, the present invention connects the first switched capacitor branch to the fourth switched capacitor branch and the second switched capacitor branch to the third switched capacitor branch, thereby reducing the use of switching transistors, lowering hardware costs, and reducing the size of the switched capacitor converter and chip while achieving a 4:1 voltage conversion ratio. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a traditional cascaded switched capacitor converter.

[0025] Figure 2 This is a schematic diagram of a switched capacitor converter provided by an embodiment of the present invention;

[0026] Figure 3 yes Figure 2 The equivalent circuit of the switched-capacitor converter is shown in the first operating mode.

[0027] Figure 4 yes Figure 2 The equivalent circuit of the switched-capacitor converter is shown in the second operating mode.

[0028] Figure 5 This is a schematic diagram of the structure of a chip provided by an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of another switched capacitor converter provided by an embodiment of the present invention;

[0030] Figure 7 yes Figure 6 The equivalent circuit of the switched-capacitor converter is shown in the first operating mode.

[0031] Figure 8 yes Figure 6 The equivalent circuit of the switched-capacitor converter is shown in the second operating mode.

[0032] Figure 9 This is a schematic diagram of another chip structure provided by an embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention;

[0034] Figure 11 This is a schematic diagram of another electronic device provided by an embodiment of the present invention. Detailed Implementation

[0035] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "bottom," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0037] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0038] The technical solutions in this application will be described below with reference to the accompanying drawings.

[0039] The switched-capacitor converter provided in this application can be applied to electronic devices such as mobile phones, tablets, laptops, ultra-mobile personal computers (UMPCs), handheld computers, netbooks, personal digital assistants (PDAs), wearable electronic devices, and virtual reality devices. This application does not impose any limitations on its application. Due to the wide range of application scenarios, no specific examples are provided here.

[0040] Figure 1 The circuit structure of a conventional doubler switched-capacitor converter is shown. This switched-capacitor converter includes an input switch Qin, a filter capacitor C0, an output capacitor Cout, a first capacitor Cfly1, a second capacitor Cfly2, a third capacitor Cfly3, a fourth capacitor Cfly4, a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, an eighth switch Q8, a ninth switch Q9, a tenth switch Q10, an eleventh switch Q11, a twelfth switch Q12, a thirteenth switch Q13, a fourteenth switch Q14, a fifteenth switch Q15, and a sixteenth switch Q16.

[0041] The input switch Qin receives the input voltage at its first terminal. The first terminal of the filter capacitor C0 is connected to the second terminal of the input switch Qin, and the second terminal of the filter capacitor C0 is connected to ground (GND). The first terminal of the first switch Q1 is connected to the second terminal of the input switch Qin. The second terminal of the first switch Q1 is connected to the first terminal of the first capacitor Cfly1 and the first terminal of the second switch Q2. The second terminal of the second switch Q2 is connected to the first terminal of the third switch Q3. The second terminal of the first capacitor Cfly1 is connected to the second terminal of the third switch Q3 and the first terminal of the fourth switch Q4. The second terminal of the fourth switch Q4 is connected to ground (GND).

[0042] The first terminal of the fifth switch Q5 is connected to the second terminal of the input switch Qin. The second terminal of the fifth switch Q5 is connected to the first terminal of the second capacitor Cfly2 and the first terminal of the sixth switch Q6. The second terminal of the sixth switch Q6 is connected to the first terminal of the seventh switch Q7. The second terminal of the second capacitor Cfly2 is connected to the second terminal of the seventh switch Q7 and the first terminal of the eighth switch Q8. The second terminal of the eighth switch Q8 is connected to ground GND.

[0043] The first terminal of the ninth switch Q9 is connected to the first terminal of the third switch Q3 and the second terminal of the fifth switch Q5. The second terminal of the ninth switch Q9 is connected to the first terminal of the third capacitor Cfly3 and the first terminal of the tenth switch Q10. The second terminal of the tenth switch Q10 is connected to the first terminal of the eleventh switch Q11. The second terminal of the eleventh switch Q11 is connected to the second terminal of the third capacitor Cfly3 and the first terminal of the twelfth switch Q12. The second terminal of the twelfth switch Q12 is connected to ground GND.

[0044] The first terminal of the thirteenth switch Q13 is connected to the first terminal of the seventh switch Q7 and the second terminal of the first switch Q1. The second terminal of the thirteenth switch Q13 is connected to the first terminal of the fourth capacitor Cfly4 and the first terminal of the fourteenth switch Q14. The second terminal of the fourteenth switch Q14 is connected to the first terminal of the fifteenth switch Q15. The second terminal of the fifteenth switch Q15 is connected to the second terminal of the fourth capacitor Cfly4 and the first terminal of the sixteenth switch Q16. The second terminal of the sixteenth switch Q16 is connected to ground GND. The first terminal of the output capacitor Cout is connected to the second terminal of the tenth switch Q10 and the second terminal of the fourteenth switch Q14. The second terminal of the output capacitor Cout is connected to ground GND. The first terminal of the output capacitor Cout provides the output voltage.

[0045] This switched-capacitor converter incorporates 16 switching components. By alternating the charging and discharging of capacitors Cfly1, Cfly2, Cfly3, and Cfly4, a voltage conversion ratio of 4:1 is achieved between the input voltage Vint and the output voltage Vout, thus realizing voltage reduction. However, the increased number of switching components leads to a larger size and higher hardware cost for the switched-capacitor converter. To address the problems arising from the increased number of switching components, this application provides a switched-capacitor converter.

[0046] Figure 2 The circuit structure of a switched capacitor converter provided in an embodiment of this application is shown.

[0047] The switched-capacitor converter can receive an input voltage Vin through its input terminal and provide an output voltage Vout through its output terminal. Figure 1 It is known that the input terminal is connected to the first terminal of the input switch Qin, and the output terminal is connected to the first terminal of the output capacitor Cout. The input voltage can be provided by a charger outside the system, or by any node in the power network inside the system. The switched-capacitor converter can generate an output voltage Vout with a specific ratio to the input voltage Vin in response to the input voltage Vin, and output it to any node outside the system or in the power network inside the system. Figure 2To clarify the working principle of the switched capacitor converter, an output capacitor Cout is shown in the switched capacitor converter. However, the output capacitor Cout can be an internal component included in the switched capacitor converter or an external component not included in the switched capacitor converter.

[0048] The shape and connection method of either the input or output terminals are not limited. Any terminal connected to the input voltage Vin can be considered an input terminal, and any terminal connected to the output voltage Vout can be considered an output terminal. Figure 2 The diagram shows an input switch Qin in a switched capacitor converter. However, the input switch Qin only serves to control the input voltage to be turned on or off. Therefore, the input switch Qin can be an internal component included in the switched capacitor converter or an external component not included in the switched capacitor converter.

[0049] In this embodiment, the switched-capacitor converter includes an input switch Qin, a filter capacitor C0, an output capacitor Cout, a first switch Q1 capacitor branch 110, a second switch Q2 capacitor branch 120, a third switch Q3 capacitor branch 130, and a fourth switch Q4 capacitor branch 140.

[0050] The first switch Q1 capacitor branch 110 includes the first switch Q1, the first capacitor Cfly1, the third switch Q3 and the fourth switch Q4; the second switch Q2 capacitor branch 120 includes the fifth switch Q5, the second capacitor Cfly2, the seventh switch Q7 and the eighth switch Q8; the third switch Q3 capacitor branch 130 includes the ninth switch Q9, the tenth switch Q10, the third capacitor Cfly3, the eleventh switch Q11 and the twelfth switch Q12; and the fourth switch Q4 capacitor branch 140 includes the thirteenth switch Q13, the fourteenth switch Q14, the fourth capacitor Cfly4, the fifteenth switch Q15 and the sixteenth switch Q16.

[0051] The first terminal of the input switch Qin receives the input voltage Vin, which can be obtained by connecting a power adapter via a USB interface or by connecting a wireless charging circuit, etc. The first terminal of the filter capacitor C0 is connected to the second terminal of the input switch Qin, and the second terminal of the filter capacitor C0 is connected to ground GND. The first terminal of the first switch Q1 is connected to the second terminal of the input switch Qin, and the second terminal of the first switch Q1 is connected to the first terminal of the first capacitor Cfly1. The second terminal of the first capacitor Cfly1 is connected to the second terminal of the third switch Q3 and the first terminal of the fourth switch Q4, and the second terminal of the fourth switch Q4 is connected to ground GND.

[0052] The first terminal of the fifth switch Q5 is connected to the second terminal of the input switch Qin. The second terminal of the fifth switch Q5 is connected to the first terminal of the second capacitor Cfly2. The second terminal of the second capacitor Cfly2 is connected to the second terminal of the seventh switch Q7 and the first terminal of the eighth switch Q8. The second terminal of the eighth switch Q8 is connected to ground GND.

[0053] The first terminal of the ninth switch Q9 is connected to the first terminal of the third switch Q3 and the second terminal of the fifth switch Q5. The second terminal of the ninth switch Q9 is connected to the first terminal of the third capacitor Cfly3 and the first terminal of the tenth switch Q10. The second terminal of the tenth switch Q10 is connected to the first terminal of the eleventh switch Q11. The second terminal of the eleventh switch Q11 is connected to the second terminal of the third capacitor Cfly3 and the first terminal of the twelfth switch Q12. The second terminal of the twelfth switch Q12 is connected to ground GND.

[0054] The first terminal of the thirteenth switch Q13 is connected to the first terminal of the seventh switch Q7 and the second terminal of the first switch Q1. The second terminal of the thirteenth switch Q13 is connected to the first terminal of the fourth capacitor Cfly4 and the first terminal of the fourteenth switch Q14. The second terminal of the fourteenth switch Q14 is connected to the first terminal of the fifteenth switch Q15. The second terminal of the fifteenth switch Q15 is connected to the second terminal of the fourth capacitor Cfly4 and the first terminal of the sixteenth switch Q16. The second terminal of the sixteenth switch Q16 is connected to ground (GND). The first terminals of the eleventh switch Q11 and the fifteenth switch Q15 are the output voltage terminals.

[0055] The first terminal of the output capacitor Cout is connected to the second terminals of the tenth switch Q10 and the fourteenth switch Q14. The second terminal of the output capacitor Cout is connected to ground GND. The first terminal of the output capacitor Cout provides the output voltage Vout. The first capacitor Cfly1, the second capacitor Cfly2, the third capacitor Cfly3, and the fourth capacitor Cfly4 are all flying capacitors used to store and release charge. The voltage across the output capacitor Cout provides a stable output voltage Vout to the external load.

[0056] In the first operating mode of this switched-capacitor converter, switches Q1, Q3, Q8, Q9, Q11, Q14, and Q16 are turned on, while switches Q4, Q5, Q7, Q10, Q12, Q13, and Q15 are turned off. Figure 3 As shown, the light color indicates that the switch assembly is in the off state.

[0057] At this point, the switched-capacitor converter consists of a charging branch, a first discharging branch, and a second discharging branch. The first switch Q1, the first capacitor Cfly1, the third switch Q3, the ninth switch Q9, the third capacitor Cfly3, and the eleventh switch Q11 are connected in series to form a charging circuit. At this time, the first capacitor Cfly1 and the third capacitor Cfly3 are in a charging state. The eighth switch Q8 and the second capacitor Cfly2 form the first discharging branch, and the second capacitor Cfly2 is in a discharging state. The sixteenth switch Q16, the fourth capacitor Cfly4, and the fourteenth switch Q14 form the second discharging branch, and the fourth capacitor Cfly4 is in a discharging state. The current flow direction is as follows: Figure 3 The solid arrow indicates the direction. When the switched capacitor converter is stable, taking the input voltage Vin = 4V0 as an example, the voltage level at the connection point of the first switch Q1 and the first capacitor Cfly1 in the charging circuit is 4V0, the voltage across the first capacitor Cfly1 is 2V0, the voltage level at the connection point of the third switch Q3 and the ninth switch Q9 is 2V0, and the voltage across the third capacitor Cfly3 is V0. Therefore, the output voltage Vout = V0.

[0058] In the second operating mode, the switched-capacitor converter has the following switches on: Q4, Q5, Q7, Q10, Q12, Q13, and Q15. The other switches are off: Q1, Q3, Q8, Q9, Q11, Q14, and Q16. Figure 4 As shown, the light color indicates that the switch assembly is in the off state.

[0059] At this point, the switched-capacitor converter consists of a charging branch, a third discharging branch, and a fourth discharging branch. Specifically, the fifth switch Q5, the second capacitor Cfly2, the seventh switch Q7, the thirteenth switch Q13, the fourth capacitor Cfly4, and the fifteenth switch Q15 constitute the charging branch, with the second capacitor Cfly2 and the fourth capacitor Cfly4 in a charging state. The fourth switch Q4 and the first capacitor Cfly1 constitute the third discharging branch, with the first capacitor Cfly1 in a discharging state. The twelfth switch Q12, the third capacitor Cfly3, and the tenth switch Q10 constitute the fourth discharging branch, with the third capacitor Cfly3 in a discharging state. The current flow direction is as follows: Figure 4 The solid arrow indicates the direction. When the switched capacitor converter is stable, taking the input voltage Vin = 4V0 as an example, the voltage level at the connection point of the fifth switch Q5 and the second capacitor Cfly2 in the charging circuit is 4V0, the voltage across the second capacitor Cfly2 is 2V0, the voltage level at the connection point of the seventh switch Q7 and the thirteenth switch Q13 is 2V0, and the voltage across the fourth capacitor Cfly4 is V0. Therefore, the output voltage Vout = V0.

[0060] Therefore, it can be seen that when the switched-capacitor converter is in the first operating mode, the voltage across the second capacitor Cfly2 is 2V0, and the voltage across the fourth capacitor Cfly4 is V0; when the switched-capacitor converter is in the second operating mode, the voltage across the first capacitor Cfly1 is 2V0, and the voltage across the third capacitor Cfly3 is V0. This achieves a voltage conversion with a 4:1 ratio between the input voltage Vin and the output voltage Vout. The switched-capacitor converter switches back and forth between the first and second operating modes.

[0061] Similar to the existing cascaded switched-capacitor converters described above, the switched-capacitor converter in this embodiment operates such that the ratio between the input voltage Vin and the output voltage Vout is approximately 4:1. Here, the term "approximately" means that even if the switched-capacitor converter is designed to have a voltage conversion ratio of 4:1 and operates at that ratio, the actual ratio of the input voltage to the output voltage may have a small error margin at 4:1 due to circuit parasitic effects of circuit components, controller error magnitude, etc. Therefore, it should be understood that even without the term "approximately," the voltage conversion ratio, voltage stress on components, etc., may still have error margins.

[0062] The aforementioned switching components (Q1, Q3, Q4, Q5, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, and Q16) and the input switch Qin all include a control terminal. Under the control of this control terminal, the switching components can switch their two ends between on and off states. Typically, the switching components can be high-speed semiconductor switching components such as FETs, IGBTs, MCTs, GTOs, and BJTs. In the embodiments of this application, the switching transistors are Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs).

[0063] Furthermore, in all examples of this application, each switching component is implemented using a single switching transistor. It can be understood that to reduce the resistance when the switch is on, each switching component may also employ two or more switching transistors connected in parallel. In the embodiments of this application, the switching transistors are divided into two types: N-type (negative) transistors and P-type (positive) transistors. The switching transistor includes a source, a drain, and a gate. The switching transistor can be turned on (opened) or off (closed, cut off, open circuit) by controlling the level of the gate of the input switching transistor. When the switching transistor is on, the source and drain conduct, generating an on-state current. The magnitude of the on-state current generated between the source and drain varies depending on the gate level of the transistor. When the switching transistor is off, the source and drain do not conduct, and no current is generated. In the embodiments of this application, the gate of the switching transistor is also referred to as the control terminal, the source as the second terminal, and the drain as the first terminal; or, the gate is referred to as the control terminal, the drain as the second terminal, and the source as the first terminal. Furthermore, an N-type transistor turns on when the control terminal is high, with both terminals conducting and generating an on-state current. When the control terminal is low, the N-type transistor turns off, with neither terminal conducting and no current flowing between them. A P-type transistor turns on when the control terminal is low, with both terminals conducting and generating an on-state current. When the control terminal is high, the P-type transistor turns off, with neither terminal conducting and no current flowing between them. The switching transistors used in the following schemes can all be referenced to the description here.

[0064] In addition, some other embodiments of this application also provide a chip, which can be regarded as a switch chip, and its structural schematic diagram is shown below. Figure 5 As shown, the chip includes a first switch Q1, a third switch Q3, a fourth switch Q4, a fifth switch Q5, a seventh switch Q7, an eighth switch Q8, a ninth switch Q9, a tenth switch Q10, an eleventh switch Q11, a twelfth switch Q12, a thirteenth switch Q13, a fourteenth switch Q14, a fifteenth switch Q15, and a sixteenth switch Q16.

[0065] Specifically, the first terminal of the first switch Q1 is connected to the second terminal of the input switch Qin and the first terminal of the filter capacitor C0. The second terminal of the first switch Q1 is connected to the first terminal of the first capacitor Cfly1. The second terminal of the first capacitor Cfly1 is connected to the second terminal of the third switch Q3 and the first terminal of the fourth switch Q4. The second terminal of the fourth switch Q4 is connected to ground GND. The second terminal of the filter capacitor C0 is connected to ground GND.

[0066] The first terminal of the fifth switch Q5 is connected to the second terminal of the input switch Qin. The second terminal of the fifth switch Q5 is connected to the first terminal of the second capacitor Cfly2. The second terminal of the second capacitor Cfly2 is connected to the second terminal of the seventh switch Q7 and the first terminal of the eighth switch Q8. The second terminal of the eighth switch Q8 is connected to ground GND.

[0067] The first terminal of the ninth switch Q9 is connected to the first terminal of the third switch Q3 and the second terminal of the fifth switch Q5. The second terminal of the ninth switch Q9 is connected to the first terminal of the third capacitor Cfly3 and the first terminal of the tenth switch Q10. The second terminal of the tenth switch Q10 is connected to the first terminal of the eleventh switch Q11 and the first terminal of the output capacitor Cout. The second terminal of the eleventh switch Q11 is connected to the second terminal of the third capacitor Cfly3 and the first terminal of the twelfth switch Q12. The second terminal of the twelfth switch Q12 is connected to ground GND.

[0068] The first terminal of the thirteenth switch Q13 is connected to the first terminal of the seventh switch Q7 and the second terminal of the first switch Q1. The second terminal of the thirteenth switch Q13 is connected to the first terminal of the fourth capacitor Cfly4 and the first terminal of the fourteenth switch Q14. The second terminal of the fourteenth switch Q14 is connected to the first terminal of the fifteenth switch Q15 and the first terminal of the output capacitor Cout. The second terminal of the fifteenth switch Q15 is connected to the second terminal of the fourth capacitor Cfly4 and the first terminal of the sixteenth switch Q16. The second terminal of the sixteenth switch Q16 is connected to ground GND. The first terminals of the eleventh switch Q11 and the fifteenth switch Q15 are the output voltage terminals.

[0069] The first terminal of the output capacitor Cout is connected to the second terminals of the tenth switch Q10 and the fourteenth switch Q14. The second terminal of the output capacitor Cout is connected to ground GND. The first terminal of the output capacitor Cout provides the output voltage Vout. The first capacitor Cfly1, the second capacitor Cfly2, the third capacitor Cfly3, and the fourth capacitor Cfly4 are all flying capacitors used to store and release charge. The voltage across the output capacitor Cout provides a stable output voltage Vout to the external load.

[0070] The first terminal of the input switch Qin receives the input voltage Vin, which can be obtained by connecting a power adapter via a USB interface or by connecting a wireless charging circuit.

[0071] In the first operating mode, the chip turns on the first switch Q1, the third switch Q3, the eighth switch Q8, the ninth switch Q9, the eleventh switch Q11, the fourteenth switch Q14, and the sixteenth switch Q16, while turns off the fourth switch Q4, the fifth switch Q5, the seventh switch Q7, the tenth switch Q10, the twelfth switch Q12, the thirteenth switch Q13, and the fifteenth switch Q15. In the second operating mode, the chip turns on the fourth switch Q4, the fifth switch Q5, the seventh switch Q7, the tenth switch Q10, the twelfth switch Q12, the thirteenth switch Q13, and the fifteenth switch Q15, while turns off the first switch Q1, the third switch Q3, the eighth switch Q8, the ninth switch Q9, the eleventh switch Q11, the fourteenth switch Q14, and the sixteenth switch Q16.

[0072] Through the above methods, the embodiments of this application can reduce the use of switching transistors, reduce hardware costs, and reduce the size of switched capacitor converters and chips while achieving a voltage conversion ratio of 4:1.

[0073] In other embodiments of this application, another switched-capacitor converter is also provided, the circuit structure of which is shown in the figure below. Figure 6 As shown, the switched-capacitor converter can receive the input voltage Vin through the input terminal and provide the output voltage Vout through the output terminal. Figure 1 It is known that the input terminal is connected to the first terminal of the input switch Qin, and the output terminal is connected to the first terminal of the output capacitor Cout. The input voltage can be provided by a charger outside the system, or by any node in the power network inside the system. The switched-capacitor converter can generate an output voltage Vout with a specific ratio to the input voltage Vin in response to the input voltage Vin, and output it to any node outside the system or in the power network inside the system. Figure 6 To clarify the working principle of the switched capacitor converter, an output capacitor Cout is shown in the switched capacitor converter. However, the output capacitor Cout can be an internal component included in the switched capacitor converter or an external component not included in the switched capacitor converter.

[0074] The shape and connection method of either the input or output terminals are not limited. Any terminal connected to the input voltage Vin can be considered an input terminal, and any terminal connected to the output voltage Vout can be considered an output terminal. Figure 6 The diagram shows a switched capacitor converter including an input switch Qin. However, the input switch Qin only serves to control the input voltage to be turned on or off. Therefore, the input switch Qin can be an internal component included in the switched capacitor converter or an external component not included in the switched capacitor converter.

[0075] In this embodiment, the switched-capacitor converter includes an input switch Qin, a filter capacitor C0, an output capacitor Cout, a first switch Q1 capacitor branch 210, a second switch Q2 capacitor branch 220, a third switch Q3 capacitor branch 230, and a fourth switch Q4 capacitor branch 240.

[0076] The first switch Q1 capacitor branch 210 includes the first switch Q1, the first capacitor Cfly1, the second switch Q2 and the fourth switch Q4; the second switch Q2 capacitor branch 220 includes the fifth switch Q5, the second capacitor Cfly2, the sixth switch Q6 and the eighth switch Q8; the third switch Q3 capacitor branch 230 includes the ninth switch Q9, the tenth switch Q10, the third capacitor Cfly3, the eleventh switch Q11 and the twelfth switch Q12; and the fourth switch Q4 capacitor branch 240 includes the thirteenth switch Q13, the fourteenth switch Q14, the fourth capacitor Cfly4, the fifteenth switch Q15 and the sixteenth switch Q16.

[0077] The first terminal of the input switch Qin receives the input voltage Vin, which can be obtained by connecting a power adapter via a USB interface or by connecting a wireless charging circuit, etc. The first terminal of the filter capacitor C0 is connected to the second terminal of the input switch Qin, and the second terminal of the filter capacitor C0 is connected to ground GND. The first terminal of the first switch Q1 is connected to the second terminal of the input switch Qin, and the second terminal of the first switch Q1 is connected to the first terminal of the first capacitor Cfly1 and the first terminal of the second switch Q2. The second terminal of the first capacitor Cfly1 is connected to the first terminal of the fourth switch Q4, and the second terminal of the fourth switch Q4 is connected to ground GND.

[0078] The first terminal of the fifth switch Q5 is connected to the second terminal of the input switch Qin. The second terminal of the fifth switch Q5 is connected to the first terminal of the second capacitor Cfly2 and the first terminal of the sixth switch Q6. The second terminal of the second capacitor Cfly2 is connected to the first terminal of the eighth switch Q8. The second terminal of the eighth switch Q8 is connected to ground GND.

[0079] The second terminal of the ninth switch Q9 is connected to the first terminal of the fourth switch Q4 and the second terminal of the sixth switch Q6. The first terminal of the ninth switch Q9 is connected to the first terminal of the third capacitor Cfly3 and the first terminal of the tenth switch Q10. The second terminal of the tenth switch Q10 is connected to the first terminal of the eleventh switch Q11. The second terminal of the eleventh switch Q11 is connected to the second terminal of the third capacitor Cfly3 and the first terminal of the twelfth switch Q12. The second terminal of the twelfth switch Q12 is connected to ground GND.

[0080] The second terminal of the thirteenth switch Q13 is connected to the first terminal of the eighth switch Q8 and the second terminal of the second switch Q2. The first terminal of the thirteenth switch Q13 is connected to the first terminal of the fourth capacitor Cfly4 and the first terminal of the fourteenth switch Q14. The second terminal of the fourteenth switch Q14 is connected to the first terminal of the fifteenth switch Q15. The second terminal of the fifteenth switch Q15 is connected to the second terminal of the fourth capacitor Cfly4 and the first terminal of the sixteenth switch Q16. The second terminal of the sixteenth switch Q16 is connected to ground (GND). The first terminals of the eleventh switch Q11 and the fifteenth switch Q15 are the output voltage terminals.

[0081] The first terminal of the output capacitor Cout is connected to the second terminals of the tenth switch Q10 and the fourteenth switch Q14. The second terminal of the output capacitor Cout is connected to ground GND. The first terminal of the output capacitor Cout provides the output voltage Vout. The first capacitor Cfly1, the second capacitor Cfly2, the third capacitor Cfly3, and the fourth capacitor Cfly4 are all flying capacitors used to store and release charge. The voltage across the output capacitor Cout provides a stable output voltage Vout to the external load.

[0082] In the first operating mode of this switched-capacitor converter, switches Q1, Q6, Q8, Q9, Q11, Q14, and Q16 are turned on, while switches Q2, Q4, Q5, Q10, Q12, Q13, and Q15 are turned off. Figure 7 As shown, the light color indicates that the switch assembly is in the off state.

[0083] At this point, the switched-capacitor converter consists of a charging branch, a first discharging branch, and a second discharging branch. The first switch Q1, the first capacitor Cfly1, the ninth switch Q9, the third capacitor Cfly3, and the eleventh switch Q11 are connected in series to form a charging circuit, with the first capacitor Cfly1 and the third capacitor Cfly3 in a charging state. The sixth switch Q6, the eighth switch Q8, and the second capacitor Cfly2 form the first discharging branch, with the second capacitor Cfly2 in a discharging state. The sixteenth switch Q16, the fourth capacitor Cfly4, and the fourteenth switch Q14 form the second discharging branch, with the fourth capacitor Cfly4 in a discharging state. The current flow direction is as follows: Figure 7 The solid arrow indicates the direction. When the switched capacitor converter is stable, taking the input voltage Vin = 4V0 as an example, the voltage level at the connection point of the first switch Q1 and the first capacitor Cfly1 in the charging circuit is 4V0, the voltage across the first capacitor Cfly1 is 2V0, the voltage level at the connection point of the sixth switch Q6 and the ninth switch Q9 is 2V0, and the voltage across the third capacitor Cfly3 is V0. Therefore, the output voltage Vout = V0.

[0084] In the second operating mode, the switched-capacitor converter has the following switches: Q2, Q4, Q5, Q10, Q12, Q13, and Q15 turned on; and Q1, Q6, Q8, Q9, Q11, Q14, and Q16 turned off. Figure 8 As shown, the light color indicates that the switch assembly is in the off state.

[0085] At this point, the switched-capacitor converter consists of a charging branch, a third discharging branch, and a fourth discharging branch. Specifically, the fifth switch Q5, the second capacitor Cfly2, the thirteenth switch Q13, the fourth capacitor Cfly4, and the fifteenth switch Q15 constitute the charging branch, with the second capacitor Cfly2 and the fourth capacitor Cfly4 in a charging state. The second switch Q2, the fourth switch Q4, and the first capacitor Cfly1 constitute the third discharging branch, with the first capacitor Cfly1 in a discharging state. The twelfth switch Q12, the third capacitor Cfly3, and the tenth switch Q10 constitute the fourth discharging branch, with the third capacitor Cfly3 in a discharging state. The current flow direction is as follows: Figure 8 The solid arrow indicates the direction. When the switched capacitor converter is stable, taking the input voltage Vin = 4V0 as an example, the voltage level at the connection point of the fifth switch Q5 and the second capacitor Cfly2 in the charging circuit is 4V0, the voltage across the second capacitor Cfly2 is 2V0, the voltage level at the connection point of the second switch Q2 and the thirteenth switch Q13 is 2V0, and the voltage across the fourth capacitor Cfly4 is V0. Therefore, the output voltage Vout = V0.

[0086] Therefore, it can be seen that when the switched-capacitor converter is in the first operating mode, the voltage across the second capacitor Cfly2 is 2V0, and the voltage across the fourth capacitor Cfly4 is V0; when the switched-capacitor converter is in the second operating mode, the voltage across the first capacitor Cfly1 is 2V0, and the voltage across the third capacitor Cfly3 is V0. This achieves a voltage conversion with a 4:1 ratio between the input voltage Vin and the output voltage Vout. The switched-capacitor converter switches back and forth between the first and second operating modes.

[0087] Similar to the existing cascaded switched-capacitor converters described above, the switched-capacitor converter in this embodiment operates such that the ratio between the input voltage Vin and the output voltage Vout is approximately 4:1. Here, the term "approximately" means that even if the switched-capacitor converter is designed to have a voltage conversion ratio of 4:1 and operates at that ratio, the actual ratio of the input voltage to the output voltage may have a small error margin at 4:1 due to circuit parasitic effects of circuit components, controller error magnitude, etc. Therefore, it should be understood that even without the term "approximately," the voltage conversion ratio, voltage stress on components, etc., may still have error margins.

[0088] Similarly, the aforementioned switching components (Q1, Q3, Q4, Q5, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, and Q16) and the input switch Qin all include a control terminal. Under the control of this control terminal, the switching components can switch their two ends between on and off states. Typically, the switching components can be high-speed semiconductor switching components such as FETs, IGBTs, MCTs, GTOs, and BJTs. In the embodiments of this application, the switching transistors are metal-oxide-semiconductor field-effect transistors (MOSFETs).

[0089] In addition, some other embodiments of this application also provide a chip, which can be regarded as a switch chip, and its structural schematic diagram is shown below. Figure 9 As shown, the chip includes a first switch Q1, a second switch Q2, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6, an eighth switch Q8, a ninth switch Q9, a tenth switch Q10, an eleventh switch Q11, a twelfth switch Q12, a thirteenth switch Q13, a fourteenth switch Q14, a fifteenth switch Q15, and a sixteenth switch Q16.

[0090] Specifically, the first terminal of the first switch Q1 is connected to the second terminal of the input switch Qin, the second terminal of the first switch Q1 is connected to the first terminal of the first capacitor Cfly1 and the first terminal of the second switch Q2, the second terminal of the first capacitor Cfly1 is connected to the first terminal of the fourth switch Q4, and the second terminal of the fourth switch Q4 is connected to ground GND.

[0091] The first terminal of the fifth switch Q5 is connected to the second terminal of the input switch Qin. The second terminal of the fifth switch Q5 is connected to the first terminal of the second capacitor Cfly2 and the first terminal of the sixth switch Q6. The second terminal of the second capacitor Cfly2 is connected to the first terminal of the eighth switch Q8. The second terminal of the eighth switch Q8 is connected to ground GND.

[0092] The second terminal of the ninth switch Q9 is connected to the first terminal of the fourth switch Q4 and the second terminal of the sixth switch Q6. The first terminal of the ninth switch Q9 is connected to the first terminal of the third capacitor Cfly3 and the first terminal of the tenth switch Q10. The second terminal of the tenth switch Q10 is connected to the first terminal of the eleventh switch Q11. The second terminal of the eleventh switch Q11 is connected to the second terminal of the third capacitor Cfly3 and the first terminal of the twelfth switch Q12. The second terminal of the twelfth switch Q12 is connected to ground GND.

[0093] The second terminal of the thirteenth switch Q13 is connected to the first terminal of the eighth switch Q8 and the second terminal of the second switch Q2. The first terminal of the thirteenth switch Q13 is connected to the first terminal of the fourth capacitor Cfly4 and the first terminal of the fourteenth switch Q14. The second terminal of the fourteenth switch Q14 is connected to the first terminal of the fifteenth switch Q15. The second terminal of the fifteenth switch Q15 is connected to the second terminal of the fourth capacitor Cfly4 and the first terminal of the sixteenth switch Q16. The second terminal of the sixteenth switch Q16 is connected to ground (GND). The first terminals of the eleventh switch Q11 and the fifteenth switch Q15 are the output voltage terminals.

[0094] The first terminal of the output capacitor Cout is connected to the second terminals of the tenth switch Q10 and the fourteenth switch Q14. The second terminal of the output capacitor Cout is connected to ground GND. The first terminal of the output capacitor Cout provides the output voltage Vout. The first capacitor Cfly1, the second capacitor Cfly2, the third capacitor Cfly3, and the fourth capacitor Cfly4 are all flying capacitors used to store and release charge. The voltage across the output capacitor Cout provides a stable output voltage Vout to the external load.

[0095] The first terminal of the input switch Qin receives the input voltage Vin, which can be obtained by connecting a power adapter via a USB interface or by connecting a wireless charging circuit.

[0096] In the first operating mode, the chip has the following switches: Q1, Q6, Q8, Q9, Q11, Q14, and Q16 turned on, and Q2, Q4, Q5, Q10, Q12, Q13, and Q15 turned off. In the second operating mode, the chip has the following switches: Q2, Q4, Q5, Q10, Q12, Q13, and Q15 turned on, and Q1, Q6, Q8, Q9, Q11, Q14, and Q16 turned off.

[0097] Similarly, through the above methods, the embodiments of this application can reduce the use of switching transistors, reduce hardware costs, and reduce the size of switched capacitor converters and chips while achieving a voltage conversion ratio of 4:1.

[0098] In addition, in conjunction with any switched-capacitor converter or chip provided in the above embodiments, this application also provides an electronic device, the structural schematic of which is shown below. Figure 10 As shown, the electronic device includes a receiving circuit 30, a wireless charging coil 40, a battery 50, and a switched capacitor converter 10 or a chip 20 as provided in the above embodiments.

[0099] A switched capacitor converter is known to receive an input voltage through an input terminal, generate an output voltage that is proportional to the input voltage in response to the input voltage, and provide the output voltage through an output terminal. Figure 10 The wireless charging coil 40 is considered a voltage source providing the input voltage, and the receiving circuit 30 can be considered an input terminal. The wireless charging coil 40 is connected to the receiving circuit 30, which in turn is connected to the switched-capacitor converter 10 or chip 20 to provide the input voltage. The battery 50 is connected to the output voltage terminal of the switched-capacitor converter 10 or chip 20. The wireless charging coil 40 generates the input voltage, and the receiving circuit 30 transmits the input voltage to the switched-capacitor converter 10 or chip 20. The switched-capacitor converter 10 or chip 20 converts the input voltage into an output voltage and outputs it to the battery 50.

[0100] In conjunction with any of the switched-capacitor converters or chips provided in the above embodiments, this application also provides another electronic device, the structural schematic of which is shown below. Figure 11 As shown, the electronic device includes a battery 50, a USB interface 60, and a switched-capacitor converter 10 or a chip 20 as provided in the above embodiments.

[0101] USB interface 60 connects to switched-capacitor converter 10 or chip 20, and battery 50 connects to the output voltage terminal of switched-capacitor converter 10 or chip 20. USB interface 60 provides input voltage to switched-capacitor converter 10 or chip 20, which converts the input voltage into an output voltage and outputs it to battery 50.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above. For the sake of brevity, they are not provided in detail; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A switched-capacitor converter, characterized in that, include: A first switch-capacitor branch includes a first switch, a first capacitor, a third switch, and a fourth switch, wherein the first terminal of the first switch receives the input voltage, the second terminal of the first switch is connected to the first terminal of the first capacitor, the second terminal of the first capacitor is connected to the second terminal of the third switch and the first terminal of the fourth switch, and the second terminal of the fourth switch is connected to ground; A second switch-capacitor branch includes a fifth switch, a second capacitor, a seventh switch, and an eighth switch, wherein the first terminal of the fifth switch receives the input voltage, the second terminal of the fifth switch is connected to the first terminal of the second capacitor, the second terminal of the second capacitor is connected to the second terminal of the seventh switch and the first terminal of the eighth switch, and the second terminal of the eighth switch is connected to ground; A third switch-capacitor branch including a ninth switch, a tenth switch, a third capacitor, an eleventh switch, and a twelfth switch, wherein the first terminal of the ninth switch is connected to the first terminal of the third switch and the second terminal of the fifth switch, the second terminal of the ninth switch is connected to the first terminal of the third capacitor and the first terminal of the tenth switch, the second terminal of the tenth switch is connected to the first terminal of the eleventh switch, the second terminal of the eleventh switch is connected to the second terminal of the third capacitor and the first terminal of the twelfth switch, and the second terminal of the twelfth switch is connected to ground; A fourth switch-capacitor branch includes a thirteenth switch, a fourteenth switch, a fourth capacitor, a fifteenth switch, and a sixteenth switch. The first terminal of the thirteenth switch is connected to the first terminal of the seventh switch and the second terminal of the first switch. The second terminal of the thirteenth switch is connected to the first terminal of the fourth capacitor and the first terminal of the fourteenth switch. The second terminal of the fourteenth switch is connected to the first terminal of the fifteenth switch. The second terminal of the fifteenth switch is connected to the second terminal of the fourth capacitor and the first terminal of the sixteenth switch. The second terminal of the sixteenth switch is connected to ground. The first terminal of the eleventh switch and the first terminal of the fifteenth switch are output voltage terminals.

2. The switched-capacitor converter according to claim 1, characterized in that, Also includes: An input switch, wherein a first terminal of the input switch receives an input voltage, and a second terminal of the input switch is connected to the first terminal of the first switch and the first terminal of the fifth switch; A filter capacitor, wherein the first end of the filter capacitor is connected to the second end of the input switch, and the second end of the filter capacitor is connected to ground; An output capacitor, the first end of which is connected to the second end of the tenth switch and the second end of the fourteenth switch, the second end of which is connected to ground, and the first end of which provides the output voltage.

3. The switched-capacitor converter according to claim 1, characterized in that, In the first operating mode, the first switch, the third switch, the eighth switch, the ninth switch, the eleventh switch, the fourteenth switch, and the sixteenth switch are turned on, while the fourth switch, the fifth switch, the seventh switch, the tenth switch, the twelfth switch, the thirteenth switch, and the fifteenth switch are turned off.

4. The switched-capacitor converter according to claim 1, characterized in that, In the second operating mode, the fourth, fifth, seventh, tenth, twelfth, thirteenth, and fifteenth switches are turned on, while the first, third, eighth, ninth, eleventh, fourteenth, and sixteenth switches are turned off.

5. A chip, characterized in that, include: Switches 1, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, and 16, among which, The first terminal of the first switch receives the input voltage, the second terminal of the first switch is connected to the first terminal of the first capacitor, the second terminal of the first capacitor is connected to the second terminal of the third switch and the first terminal of the fourth switch, and the second terminal of the fourth switch is connected to ground. The first terminal of the fifth switch receives the input voltage, the second terminal of the fifth switch is connected to the first terminal of the second capacitor, the second terminal of the second capacitor is connected to the second terminal of the seventh switch and the first terminal of the eighth switch, and the second terminal of the eighth switch is connected to ground; The first terminal of the ninth switch is connected to the first terminal of the third switch and the second terminal of the fifth switch; the second terminal of the ninth switch is connected to the first terminal of the third capacitor and the first terminal of the tenth switch; the second terminal of the tenth switch is connected to the first terminal of the eleventh switch; the second terminal of the eleventh switch is connected to the second terminal of the third capacitor and the first terminal of the twelfth switch; and the second terminal of the twelfth switch is connected to ground. The first terminal of the thirteenth switch is connected to the first terminal of the seventh switch and the second terminal of the first switch; the second terminal of the thirteenth switch is connected to the first terminal of the fourth capacitor and the first terminal of the fourteenth switch; the second terminal of the fourteenth switch is connected to the first terminal of the fifteenth switch; the second terminal of the fifteenth switch is connected to the second terminal of the fourth capacitor and the first terminal of the sixteenth switch; and the second terminal of the sixteenth switch is connected to ground. The first terminal of the eleventh switch and the first terminal of the fifteenth switch are output voltage terminals.

6. The chip according to claim 5, characterized in that, In the first operating mode, the first switch, the third switch, the eighth switch, the ninth switch, the eleventh switch, the fourteenth switch, and the sixteenth switch are turned on, while the fourth switch, the fifth switch, the seventh switch, the tenth switch, the twelfth switch, the thirteenth switch, and the fifteenth switch are turned off.

7. The chip according to claim 5, characterized in that, In the second operating mode, the fourth, fifth, seventh, tenth, twelfth, thirteenth, and fifteenth switches are turned on, while the first, third, eighth, ninth, eleventh, fourteenth, and sixteenth switches are turned off.

8. A switched-capacitor converter, characterized in that, include: A first switch-capacitor branch includes a first switch, a second switch, a first capacitor, and a fourth switch, wherein a first terminal of the first switch receives an input voltage, a second terminal of the first switch is connected to a first terminal of the first capacitor and a first terminal of the second switch, a second terminal of the first capacitor is connected to a first terminal of the fourth switch, and a second terminal of the fourth switch is connected to ground. A second switch-capacitor branch includes a fifth switch, a sixth switch, a second capacitor, and an eighth switch, wherein the first terminal of the fifth switch receives the input voltage, the second terminal of the fifth switch is connected to the first terminal of the second capacitor and the first terminal of the sixth switch, the second terminal of the second capacitor is connected to the first terminal of the eighth switch, and the second terminal of the eighth switch is connected to ground; A third switch-capacitor branch including a ninth switch, a tenth switch, a third capacitor, an eleventh switch, and a twelfth switch, wherein the second terminal of the ninth switch is connected to the first terminal of the fourth switch and the second terminal of the sixth switch, the first terminal of the ninth switch is connected to the first terminal of the third capacitor and the first terminal of the tenth switch, the second terminal of the tenth switch is connected to the first terminal of the eleventh switch, the second terminal of the eleventh switch is connected to the second terminal of the third capacitor and the first terminal of the twelfth switch, and the second terminal of the twelfth switch is connected to ground; A fourth switch-capacitor branch includes a thirteenth switch, a fourteenth switch, a fourth capacitor, a fifteenth switch, and a sixteenth switch, wherein the second terminal of the thirteenth switch is connected to the first terminal of the eighth switch and the second terminal of the second switch, the first terminal of the thirteenth switch is connected to the first terminal of the fourth capacitor and the first terminal of the fourteenth switch, the second terminal of the fourteenth switch is connected to the first terminal of the fifteenth switch, the second terminal of the fifteenth switch is connected to the second terminal of the fourth capacitor and the first terminal of the sixteenth switch, and the second terminal of the sixteenth switch is connected to ground; The first terminal of the eleventh switch and the first terminal of the fifteenth switch are output voltage terminals.

9. The switched-capacitor converter according to claim 8, characterized in that, Also includes: An input switch, wherein a first terminal of the input switch receives an input voltage, and a second terminal of the input switch is connected to the first terminal of the first switch and the first terminal of the fifth switch; A filter capacitor, wherein the first end of the filter capacitor is connected to the second end of the input switch, and the second end of the filter capacitor is connected to ground; An output capacitor, the first end of which is connected to the second end of the tenth switch and the second end of the fourteenth switch, the second end of which is connected to ground, and the first end of which provides the output voltage.

10. The switched-capacitor converter according to claim 8, characterized in that, In the first operating mode, the first switch, the sixth switch, the eighth switch, the ninth switch, the eleventh switch, the fourteenth switch, and the sixteenth switch are turned on, while the second switch, the fourth switch, the fifth switch, the tenth switch, the twelfth switch, the thirteenth switch, and the fifteenth switch are turned off.

11. The switched-capacitor converter according to claim 8, characterized in that, In the second operating mode, the second switch, the fourth switch, the fifth switch, the tenth switch, the twelfth switch, the thirteenth switch, and the fifteenth switch are turned on, while the first switch, the sixth switch, the eighth switch, the ninth switch, the eleventh switch, the fourteenth switch, and the sixteenth switch are turned off.

12. A chip, characterized in that, include: Switches 1, 2, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, and 16, wherein... The first terminal of the first switch receives the input voltage, the second terminal of the first switch is connected to the first terminal of the first capacitor and the first terminal of the second switch, the second terminal of the first capacitor is connected to the first terminal of the fourth switch, and the second terminal of the fourth switch is connected to ground. The first terminal of the fifth switch receives the input voltage, the second terminal of the fifth switch is connected to the first terminal of the second capacitor and the first terminal of the sixth switch, the second terminal of the second capacitor is connected to the first terminal of the eighth switch, and the second terminal of the eighth switch is connected to ground; The second terminal of the ninth switch is connected to the first terminal of the fourth switch and the second terminal of the sixth switch; the first terminal of the ninth switch is connected to the first terminal of the third capacitor and the first terminal of the tenth switch; the second terminal of the tenth switch is connected to the first terminal of the eleventh switch; the second terminal of the eleventh switch is connected to the second terminal of the third capacitor and the first terminal of the twelfth switch; and the second terminal of the twelfth switch is connected to ground. The first terminal of the thirteenth switch is connected to the first terminal of the eighth switch and the second terminal of the second switch; the second terminal of the thirteenth switch is connected to the first terminal of the fourth capacitor and the first terminal of the fourteenth switch; the second terminal of the fourteenth switch is connected to the first terminal of the fifteenth switch; the second terminal of the fifteenth switch is connected to the second terminal of the fourth capacitor and the first terminal of the sixteenth switch; and the second terminal of the sixteenth switch is connected to ground. The first terminal of the eleventh switch and the first terminal of the fifteenth switch are output voltage terminals.

13. The chip according to claim 12, characterized in that, In the first operating mode, the first switch, the sixth switch, the eighth switch, the ninth switch, the eleventh switch, the fourteenth switch, and the sixteenth switch are turned on, while the second switch, the fourth switch, the fifth switch, the tenth switch, the twelfth switch, the thirteenth switch, and the fifteenth switch are turned off.

14. The chip according to claim 12, characterized in that, In the second operating mode, the second switch, the fourth switch, the fifth switch, the tenth switch, the twelfth switch, the thirteenth switch, and the fifteenth switch are turned on, while the first switch, the sixth switch, the eighth switch, the ninth switch, the eleventh switch, the fourteenth switch, and the sixteenth switch are turned off.

15. An electronic device, characterized in that, Includes the switched-capacitor converter as described in any one of claims 1-4, the chip as described in any one of claims 5-7, the switched-capacitor converter as described in any one of claims 8-11, or the chip as described in any one of claims 12-14.

16. The electronic device according to claim 15, characterized in that, It also includes a wireless charging coil, a receiving circuit, and a battery; The wireless charging coil is connected to the receiving circuit, which is connected to the switched capacitor converter or the chip to provide the input voltage, and the battery is connected to the output voltage terminal.

17. The electronic device according to claim 15, characterized in that, It also includes a USB interface and a battery, the USB interface being connected to the switched-capacitor converter or the chip to provide the input voltage, and the battery being connected to the output voltage terminal.

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