Multi-transformation ratio switched capacitor voltage conversion circuit, chip and electronic equipment

Abstract

The invention provides a multi-transformation ratio switched capacitor voltage conversion circuit, a chip and electronic equipment. The circuit comprises a first unit and a second unit, the first unit comprises a first basic unit, a second basic unit and a third basic unit; the second unit comprises N cascade units; each cascade unit comprises a first cascade capacitor, a second cascade capacitor and a cascade switch assembly; the first basic unit comprises a first capacitor, a second capacitor and a first switch assembly, the second basic unit comprises a third capacitor, a fourth capacitor and a second switch assembly, and the third basic unit comprises a fifth capacitor, a sixth capacitor and a third switch assembly; the switch assembly comprises a first switch assembly, a second switch assembly, a third switch assembly and cascade switch assemblies. The switch assembly is used for controlling the connection relation among the capacitors; therefore, the multi-transformation ratio switched capacitor voltage conversion circuit converts the input voltage into the output voltage according to (2N + 6): 1. And a higher voltage transformation ratio can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power management chips, in particular to a multi-ratio switched capacitor voltage conversion circuit, a chip and an electronic device. BACKGROUND

[0002] Switched capacitor voltage converter, also commonly known as charge pump, is a high-efficiency converter that uses capacitor devices to store and release electric energy for direct current voltage conversion. Based on the state switching of power tubes and the characteristics of the storage and release of electric energy of capacitor devices, charge pump can realize the proportional conversion of voltage or current, and this technology is widely used in fast charging occasions of mobile devices such as smart phones, tablet computers, smart watches, etc. Switched capacitor voltage converter usually includes multiple power tubes (or transistors used as switches) and multiple capacitors. By controlling the power tubes to be in different switching states in different states, the connection relationship between the multiple capacitors is controlled, and based on the characteristics of the storage and release of electric energy of each capacitor in different states, the switched capacitor voltage converter can realize the proportional conversion between the input voltage and the output voltage, and the proportional conversion between the input current and the output current, for example, the output voltage is converted to 1 / 4 of the input voltage, and the output current is converted to 4 times of the input current.

[0003] With the rapid development of fast charging technology in the field of portable electronic devices such as smart phones and smart watches, the demand for voltage conversion ratio of switched capacitor voltage converter is constantly increasing. In a specific fast charging application scenario, higher voltage conversion ratio is needed to obtain greater current. Referring to Figure 1 , Figure 1 A switched capacitor voltage conversion circuit structure diagram with a voltage conversion ratio of 6:1 is provided for the related art, as shown in Figure 1 , which includes a switched capacitor voltage conversion circuit with a voltage conversion ratio of 3:1 (i.e. 3:1 Charge pump) and a switched capacitor voltage conversion circuit with a voltage conversion ratio of 2:1 (i.e. 2:1 Charge pump). By cascading the switched capacitor voltage conversion circuit with a voltage conversion ratio of 3:1 and the switched capacitor voltage conversion circuit with a voltage conversion ratio of 2:1, a switched capacitor voltage conversion circuit with a voltage conversion ratio of 6:1 is obtained.

[0004] Referring to Figure 2 , Figure 2 A switched capacitor voltage conversion circuit with a voltage conversion ratio of 6:1 corresponding to Figure 1 is provided for the related art, as shown in Figure 2As shown, the switch capacitor voltage conversion circuit with voltage ratio of 3:1 (i.e. 3:1 Charge pump) includes fourteen power tubes and four flying capacitors, i.e. first power tube M1A, second power tube M2A, third power tube M3A, fourth power tube M4A, fifth power tube M5A, sixth power tube M6A, seventh power tube M7A, eighth power tube M1B, ninth power tube M2B, tenth power tube M3B, eleventh power tube M4B, twelfth power tube M5B, thirteenth power tube M6B, fourteenth power tube M7B, first flying capacitor C1A, second flying capacitor C2A, third flying capacitor C1B and fourth flying capacitor C2B. By controlling the on or off of the fourteen power tubes, the connection relationship of the first flying capacitor C1A, the second flying capacitor C2A, the third flying capacitor C1B and the fourth flying capacitor C2B is controlled, and the energy storage of the four flying capacitors is used to realize the voltage reduction function, i.e. the switch capacitor voltage conversion circuit with voltage ratio of 3:1 can convert the output voltage Vout to 1 / 3 of the input voltage Vin, and convert the output current to 3 times of the input current, i.e. as Figure 2 As shown, the input signal of the 3:1 Charge pump is Vin=6*Vout, and the output signal of the 3:1 Charge pump is Vmid=2*Vout. At the same time, the output signal of the 3:1 Charge pump is used as the input signal of the subsequent module (i.e. 2:1 Charge pump).

[0005] Continuing to refer to Figure 2 , the switch capacitor voltage conversion circuit with voltage ratio of 2:1 (i.e. 2:1 Charge pump) includes eight power tubes and two flying capacitors, i.e. fifteenth power tube M8A, sixteenth power tube M9A, seventeenth power tube M10A, eighteenth power tube M11A, nineteenth power tube M8B, twentieth power tube M9B, twenty-first power tube M10B, twenty-second power tube M11B, fifth flying capacitor C3A and sixth flying capacitor C3B. By controlling the on or off of the eight power tubes, the connection relationship of the fifth flying capacitor C3A and the sixth flying capacitor C3B is controlled, and the energy storage of the two flying capacitors is used to realize the voltage reduction function, i.e. the switch capacitor voltage conversion circuit with voltage ratio of 2:1 can convert the output voltage to 1 / 2 of the input voltage, and convert the output current to 2 times of the input current, i.e. the input signal of the 2:1 Charge pump is Vmid=2*Vout, and the output signal of the 2:1 Charge pump is Vout. The switch capacitor voltage conversion circuit with voltage ratio of 3:1 and the switch capacitor voltage conversion circuit with voltage ratio of 2:1 work independently, and the output voltage is converted to 1 / 6 of the input voltage by cascading, and the output current is converted to 6 times of the input current, i.e. the voltage ratio of the input voltage and the output voltage is 6:1.

[0006] The 6:1 switched-capacitor voltage conversion circuit architecture provided in related technologies suffers from reduced overall circuit efficiency due to inherent losses from multi-stage power conversion when achieving high voltage ratios. It also increases the number of switching elements and passive components, leading to higher circuit costs and limiting its application in high-power-density fast charging systems. Therefore, achieving higher voltage ratios is a crucial problem that needs to be solved. Summary of the Invention

[0007] This application provides a multi-ratio switched capacitor voltage conversion circuit, chip, and electronic device to achieve a higher voltage ratio.

[0008] In a first aspect, this application provides a multi-ratio switched capacitor voltage conversion circuit, the multi-ratio switched capacitor voltage conversion circuit comprising: a first unit and a second unit; the first unit comprising a first basic unit, a second basic unit and a third basic unit; the second unit comprising N cascaded units; wherein N is an integer greater than or equal to 1; each cascaded unit comprising a first cascaded capacitor, a second cascaded capacitor and a cascaded switching assembly; the first basic unit comprising a first capacitor, a second capacitor and a first switching assembly, the second basic unit comprising a third capacitor, a fourth capacitor and a second switching assembly, and the third basic unit comprising a fifth capacitor, a sixth capacitor and a third switching assembly; The first terminal of the Nth cascaded unit serves as the input terminal of the multi-ratio switched capacitor voltage conversion circuit, used to connect the input voltage. The second and fourth terminals of the Nth cascaded unit are both electrically connected to the first terminal of the (N-1)th cascaded unit. The third terminal of the Nth cascaded unit is electrically connected to the first plate of the first cascaded capacitor in the (N-1)th cascaded unit. The fifth terminal of the Nth cascaded unit is electrically connected to the first plate of the second cascaded capacitor in the (N-1)th cascaded unit. The second and fourth terminals of the first cascaded unit in the N cascaded units are electrically connected to the first terminal of the third basic unit. The third terminal of the first cascaded unit is electrically connected to the first plate of the fifth capacitor, and the fifth terminal of the first cascaded unit is electrically connected to the first plate of the sixth capacitor. The second and fourth terminals of the third basic unit are electrically connected to the first terminal of the second basic unit. The third terminal of the third basic unit is electrically connected to the first plate of the third capacitor, and the fifth terminal of the third basic unit is electrically connected to the first plate of the fourth capacitor. The second terminal of the second basic unit is electrically connected to the first plate of the first capacitor, and the third terminal of the second basic unit is electrically connected to the first plate of the second capacitor. The first terminal of the first basic unit serves as the output terminal of the multi-ratio switched capacitor voltage conversion circuit, used to output the output voltage. The switch assembly comprises the first switch assembly, the second switch assembly, the third switch assembly, and each of the cascade switch assemblies; The switch assembly is configured to control the connection relationship between each of the first cascade capacitor, each of the second cascade capacitor, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, and the sixth capacitor. The multi-ratio switched capacitor voltage conversion circuit is configured to convert the input voltage into the output voltage, and the input voltage is (2N+6) times of the output voltage.

[0009] In a possible design, the cascade switch assembly comprises a first cascade switch, a second cascade switch, a third cascade switch, a fourth cascade switch, a fifth cascade switch, a sixth cascade switch, a seventh cascade switch, and an eighth cascade switch. The second end of the first cascade switch is electrically connected with the second end of the fifth cascade switch, and serves as a first end of the cascade unit; the first end of the first cascade switch is electrically connected with the second end of the third cascade switch and the first plate of the first cascade capacitor respectively; and the first end of the third cascade switch serves as a second end of the cascade unit. The second plate of the first cascade capacitor is electrically connected with the second end of the second cascade switch and the first end of the fourth cascade switch respectively; and the second end of the fourth cascade switch serves as a third end of the cascade unit. The first end of the fifth cascade switch is electrically connected with the second end of the seventh cascade switch and the first plate of the second cascade capacitor respectively; and the first end of the seventh cascade switch serves as a fourth end of the cascade unit. The second plate of the second cascade capacitor is electrically connected with the second end of the sixth cascade switch and the first end of the eighth cascade switch respectively; and the second end of the eighth cascade switch serves as a fifth end of the cascade unit. The first end of the second cascade switch and the first end of the sixth cascade switch are grounded.

[0010] In a possible design, the third switch assembly comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube, and an eighth switch tube. The second end of the first switch tube is electrically connected with the second end of the fifth switch tube, and serves as a first end of the third basic unit; the first end of the first switch tube is electrically connected with the second end of the third switch tube and the first plate of the fifth capacitor respectively; and the first end of the third switch tube serves as a second end of the third basic unit. The second plate of the fifth capacitor is electrically connected with the second end of the second switch tube and the first end of the fourth switch tube respectively, and the second end of the fourth switch tube is the third end of the third basic unit; The first end of the fifth switch tube is electrically connected with the second end of the seventh switch tube and the first plate of the sixth capacitor respectively, and the first end of the seventh switch tube is the fourth end of the third basic unit; The second plate of the sixth capacitor is electrically connected with the second end of the sixth switch tube and the first end of the eighth switch tube respectively, and the second end of the eighth switch tube is the fifth end of the third basic unit; The first end of the second switch tube and the first end of the sixth switch tube are grounded.

[0011] In a possible design, the second switch assembly includes a ninth switch tube, a tenth switch tube, an eleventh switch tube, a twelfth switch tube, a thirteenth switch tube, a fourteenth switch tube, a fifteenth switch tube, and a sixteenth switch tube; The second end of the ninth switch tube is electrically connected with the second end of the thirteenth switch tube, and the second end of the ninth switch tube is the first end of the second basic unit, and the first end of the ninth switch tube is electrically connected with the second end of the tenth switch tube and the first plate of the third capacitor respectively; The first end of the tenth switch tube is electrically connected with the second end of the eleventh switch tube, and the first end of the tenth switch tube is the second end of the second basic unit, and the first end of the eleventh switch tube is electrically connected with the second plate of the third capacitor and the second end of the twelfth switch tube respectively; The first end of the thirteenth switch tube is electrically connected with the second end of the fourteenth switch tube and the first plate of the fourth capacitor respectively, the first end of the fourteenth switch tube is electrically connected with the second end of the fifteenth switch tube, and the first end of the fourteenth switch tube is the third end of the second basic unit; The first end of the fifteenth switch tube is electrically connected with the second plate of the fourth capacitor and the second end of the sixteenth switch tube respectively; The first end of the twelfth switch tube and the first end of the sixteenth switch tube are grounded.

[0012] In a possible design, the first switch assembly includes a seventeenth switch tube, an eighteenth switch tube, a nineteenth switch tube, a twentieth switch tube, a twenty-first switch tube, and a twenty-second switch tube; The second end of the seventeenth switch tube is electrically connected with the first plate of the first capacitor, the first end of the seventeenth switch tube is electrically connected with the second end of the eighteenth switch tube, and the first end of the seventeenth switch tube is the first end of the first basic unit; The first end of the eighteenth switch tube is electrically connected with the second pole plate of the first capacitor and the second end of the nineteenth switch tube respectively, and the second end of the twentieth switch tube is electrically connected with the first pole plate of the second capacitor; The first end of the twentieth switch tube is electrically connected with the second end of the twenty-first switch tube and the first end of the first basic unit respectively, and the first end of the twenty-first switch tube is electrically connected with the second pole plate of the second capacitor and the second end of the twenty-second switch tube respectively. The first end of the nineteenth switch tube and the first end of the twenty-second switch tube are grounded.

[0013] In a possible design, the multi-ratio switched-capacitor voltage conversion circuit is configured to convert the input voltage into the output voltage in a first mode, the input voltage being (2N+6) times of the output voltage; wherein the first mode is switching of the switching assembly between a first state and a second state. In the first state, the first switch tube, the fourth switch tube, the sixth switch tube, the seventh switch tube, the sixteenth switch tube, the ninth switch tube, the fourteenth switch tube, the eleventh switch tube, the twentieth switch tube, the eighteenth switch tube, the twenty-second switch tube, each first cascade switch, each fourth cascade switch, each sixth cascade switch and each seventh cascade switch are turned on; and the second switch tube, the third switch tube, the fifth switch tube, the eighth switch tube, the twelfth switch tube, the tenth switch tube, the thirteenth switch tube, the fifteenth switch tube, the seventeenth switch tube, the nineteenth switch tube, the twenty-first switch tube, each second cascade switch, each third cascade switch, each fifth cascade switch and each eighth cascade switch are turned off. In the second state, the second switch tube, the third switch tube, the fifth switch tube, the eighth switch tube, the twelfth switch tube, the tenth switch tube, the thirteenth switch tube, the fifteenth switch tube, the seventeenth switch tube, the nineteenth switch tube, the twenty-first switch tube, each second cascade switch, each third cascade switch, each fifth cascade switch and each eighth cascade switch are turned on; and the first switch tube, the fourth switch tube, the sixth switch tube, the seventh switch tube, the sixteenth switch tube, the ninth switch tube, the fourteenth switch tube, the eleventh switch tube, the twentieth switch tube, the eighteenth switch tube, the twenty-second switch tube, each first cascade switch, each fourth cascade switch, each sixth cascade switch and each seventh cascade switch are turned off.

[0014] In one possible design, when the second unit includes the N cascaded units and an (N+1)th cascaded unit: If the multiple-ratio switched-capacitor voltage conversion circuit converts the input voltage to the output voltage when the second unit includes the N cascaded units, the input voltage is X times the output voltage, the voltage on the first cascaded capacitor of the Nth cascaded unit and the voltage on the second cascaded capacitor of the Nth cascaded unit are both Y times the output voltage; and when the third switch component is in a third state, a cascaded switch component in the (N+1)th cascaded unit is in a fourth state; when the third switch component is in a fifth state, the cascaded switch component in the (N+1)th cascaded unit is in a sixth state; The multiple-ratio switched-capacitor voltage conversion circuit is configured to convert the input voltage to the output voltage in the second mode, the input voltage being 2*X times the output voltage. In the second mode, the first cascaded switch in the Nth cascaded unit and the first cascaded switch in the (N+1)th cascaded unit are in the same state, and the fifth cascaded switch in the Nth cascaded unit and the fifth cascaded switch in the (N+1)th cascaded unit are in the same state. The multiple-ratio switched-capacitor voltage conversion circuit is further configured to convert the input voltage to the output voltage in a third mode, the input voltage being (X+Y) times the output voltage. In the third mode, the first cascaded switch in the Nth cascaded unit and the first cascaded switch in the (N+1)th cascaded unit are in opposite states, and the fifth cascaded switch in the Nth cascaded unit and the fifth cascaded switch in the (N+1)th cascaded unit are in opposite states. In the third state, the first switch, the fourth switch, the sixth switch, and the seventh switch are controlled to be turned on, and the second switch, the third switch, the fifth switch, and the eighth switch are controlled to be turned off. In the fourth state, the first cascaded switch in the (N+1)th cascaded unit, the fourth cascaded switch in the (N+1)th cascaded unit, the sixth cascaded switch in the (N+1)th cascaded unit, and the seventh cascaded switch in the (N+1)th cascaded unit are controlled to be turned on, and the second cascaded switch in the (N+1)th cascaded unit, the third cascaded switch in the (N+1)th cascaded unit, the fifth cascaded switch in the (N+1)th cascaded unit, and the eighth cascaded switch in the (N+1)th cascaded unit are controlled to be turned off. In the fifth state, the second switch, the third switch, the fifth switch, and the eighth switch are controlled to be turned on, and the first switch, the fourth switch, the sixth switch, and the seventh switch are controlled to be turned off. In the sixth state, the second cascaded switch in the N+1th cascaded unit, the third cascaded switch in the N+1th cascaded unit, the fifth cascaded switch in the N+1th cascaded unit, and the eighth cascaded switch in the N+1th cascaded unit are controlled to be turned on; the first cascaded switch in the N+1th cascaded unit, the fourth cascaded switch in the N+1th cascaded unit, the sixth cascaded switch in the N+1th cascaded unit, and the seventh cascaded switch in the N+1th cascaded unit are controlled to be turned off.

[0015] In a possible design, in a case where the multi-ratio switched-capacitor voltage conversion circuit includes the first unit, the switch assembly includes the first switch assembly, the second switch assembly, and the third switch assembly. The switch assembly is configured to control connection relationships among the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, and the sixth capacitor. The multi-ratio switched-capacitor voltage conversion circuit is configured to convert the input voltage into the output voltage, where the input voltage is 6 times or 4 times of the output voltage.

[0016] In a possible design, the multi-ratio switched-capacitor voltage conversion circuit is configured to convert the input voltage into the output voltage in the fourth mode, where the input voltage is 6 times of the output voltage; and the fourth mode is switching of the switch assembly between the seventh state and the eighth state. In the seventh state, the first switch, the fourth switch, the sixth switch, the seventh switch, the sixteenth switch, the ninth switch, the fourteenth switch, the eleventh switch, the twentieth switch, the eighteenth switch, and the twenty-second switch are controlled to be turned on; and the second switch, the third switch, the fifth switch, the eighth switch, the twelfth switch, the tenth switch, the thirteenth switch, the fifteenth switch, the seventeenth switch, the nineteenth switch, and the twenty-first switch are controlled to be turned off. In the eighth state, the second switch, the third switch, the fifth switch, the eighth switch, the twelfth switch, the tenth switch, the thirteenth switch, the fifteenth switch, the seventeenth switch, the nineteenth switch, and the twenty-first switch are controlled to be turned on; and the first switch, the fourth switch, the sixth switch, the seventh switch, the sixteenth switch, the ninth switch, the fourteenth switch, the eleventh switch, the twentieth switch, the eighteenth switch, and the twenty-second switch are controlled to be turned off.

[0017] In a possible design, the multi-ratio switched-capacitor voltage conversion circuit is configured to convert the input voltage into an output voltage in a fifth mode, where the input voltage is 4 times the output voltage; and the fifth mode is switching of the switching assembly between a ninth state and a tenth state. In the ninth state, the first switch, the fourth switch, the sixth switch, the seventh switch, the sixteenth switch, the thirteenth switch, the fourteenth switch, the eleventh switch, the eighteenth switch, the twentieth switch, and the twenty-second switch are controlled to be turned on; and the fifth switch, the eighth switch, the second switch, the third switch, the twelfth switch, the ninth switch, the tenth switch, the fifteenth switch, the seventeenth switch, the nineteenth switch, and the twenty-first switch are controlled to be turned off. In the tenth state, the fifth switch, the eighth switch, the second switch, the third switch, the twelfth switch, the ninth switch, the tenth switch, the fifteenth switch, the seventeenth switch, the nineteenth switch, and the twenty-first switch are controlled to be turned on; and the first switch, the fourth switch, the sixth switch, the seventh switch, the sixteenth switch, the thirteenth switch, the fourteenth switch, the eleventh switch, the eighteenth switch, the twentieth switch, and the twenty-second switch are controlled to be turned off.

[0018] In a second aspect, the present application provides a chip, including the multi-ratio switched-capacitor voltage conversion circuit as in the first aspect.

[0019] In a third aspect, the present application provides an electronic device, including the chip as in the second aspect.

[0020] The present application has the following beneficial effects: In the embodiment of the present application, the multi-ratio switched capacitor voltage conversion circuit comprises a first unit and a second unit; the first unit comprises a first basic unit, a second basic unit and a third basic unit; the second unit comprises N cascaded units; each cascaded unit comprises a first cascaded capacitor, a second cascaded capacitor and a cascaded switch assembly; the first basic unit comprises a first capacitor, a second capacitor and a first switch assembly, the second basic unit comprises a third capacitor, a fourth capacitor and a second switch assembly, and the third basic unit comprises a fifth capacitor, a sixth capacitor and a third switch assembly; based on the electrical connection relationship between the N cascaded units, the first basic unit, the second basic unit and the third basic unit, the switch assembly comprises the first switch assembly, the second switch assembly, the third switch assembly and each cascaded switch assembly, and the connection relationship between each first cascaded capacitor, each second cascaded capacitor, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor can be controlled through the switch assembly; based on the characteristics of the storage and release of electrical energy of each capacitor, the input voltage can be converted into the output voltage with a voltage conversion ratio of (2N+6):1, different voltage conversion ratios can be achieved according to different values of N, and higher voltage conversion ratios can be achieved when the value of N increases. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other embodiments can also be obtained by those skilled in the art based on these drawings.

[0022] Figure 1 A switched capacitor voltage conversion circuit structure diagram with a voltage conversion ratio of 6:1 is provided for related technologies; Figure 2 A switched capacitor voltage conversion circuit with a corresponding voltage conversion ratio of 6:1 is provided for related technologies; Figure 1 A switched capacitor voltage conversion circuit with a corresponding voltage conversion ratio of 6:1 is provided for related technologies; Figure 3 A multi-ratio switched capacitor voltage conversion circuit structure diagram is provided for the embodiment of the present application; Figure 4 A cascaded unit circuit structure diagram is provided for the embodiment of the present application; Figure 5 A switch assembly state diagram in the seventh state is provided for the embodiment of the present application; Figure 6 A switch assembly state diagram in the eighth state is provided for the embodiment of the present application; Figure 7A connection relationship diagram corresponding to the switching of the seventh state and the eighth state in the fourth mode provided by the embodiment of the present application is shown in the figure; Figure 8 A state diagram of the switch assembly in the ninth state provided by the embodiment of the present application is shown in the figure; Figure 9 A state diagram of the switch assembly in the tenth state provided by the embodiment of the present application is shown in the figure; Figure 10 A connection relationship diagram corresponding to the switching of the ninth state and the tenth state in the fifth mode provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0023] In the present application, “at least one” means one or more, and “multiple” means two or more. “And / or” describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B, which can represent the following cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character “ / ” generally represents an “or” relationship between the associated objects. “At least one of the following” or similar expressions means any combination of these items, including single item or any combination of multiple items. For example, at least one of a, b, or c alone, can represent: a alone, b alone, c alone, combination of a and b, combination of a and c, combination of b and c, or combination of a, b, and c, where a, b, and c can be single or multiple. In addition, the terms “first” and “second” are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] The terms “center”, “longitudinal”, “transverse”, “upper”, “lower”, “left”, “right”, “front”, “back”, and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0025] The terms “connected” and “connected” should be broadly understood, for example, the “connected” or “connected” of the circuit structure can mean physical connection, but also means electrical connection or signal connection, for example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, it can also be the internal connection of two elements; signal connection can not only be signal connection through a circuit, but also signal connection through media such as radio waves. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In order to solve the problem of covering a larger input-output voltage variation range without wasting the overall circuit efficiency and realizing a higher voltage variation ratio in the related art, the present application provides a multi-variation ratio switched-capacitor voltage conversion circuit, which realizes conversion of an input voltage into an output voltage with a voltage variation ratio of (2N+6): 1 by controlling each switch tube to be in a different switching state, and realizes a higher voltage variation ratio according to different values of N.

[0027] In order to realize a higher voltage variation ratio, the present application provides a multi-variation ratio switched-capacitor voltage conversion circuit, as shown in Figure 3 , Figure 3 The multi-variation ratio switched-capacitor voltage conversion circuit provided by the embodiment of the present application has a structure as shown in Figure 3 The multi-variation ratio switched-capacitor voltage conversion circuit 1000 can include a first unit 100 and a second unit 200; the first unit 100 includes a first basic unit, a second basic unit, and a third basic unit; the second unit 200 includes N cascaded units; wherein N is an integer greater than or equal to 1; each cascaded unit includes a first cascaded capacitor, a second cascaded capacitor, and a cascaded switch component; the first basic unit includes a first capacitor CF1A, a second capacitor CF1B, and a first switch component 10, the second basic unit includes a third capacitor CF2A, a fourth capacitor CF2B, and a second switch component 20, and the third basic unit includes a fifth capacitor CF3A, a sixth capacitor CF3B, and a third switch component 30.

[0028] The first end TNN1 of the Nth cascaded unit in the N cascaded units is used as the input end IN of the multi-variation ratio switched-capacitor voltage conversion circuit 1000 for inputting an input voltage VIN, and the second end TNN2 and the fourth end TNN4 of the Nth cascaded unit are electrically connected to the first end of the (N-1)th cascaded unit in the N cascaded units; the third end TNN3 of the Nth cascaded unit is electrically connected to the first plate of the first cascaded capacitor in the (N-1)th cascaded unit, and the fifth end TNN5 of the Nth cascaded unit is electrically connected to the first plate of the second cascaded capacitor of the (N-1)th cascaded unit.

[0029] The second end TN12 and the fourth end TN14 of the first cascade unit of the N cascade units are electrically connected with the first end T31 of the third basic unit, the third end TN13 of the first cascade unit is electrically connected with the first plate of the fifth capacitor CF3A, and the fifth end TN15 of the first cascade unit is electrically connected with the first plate of the sixth capacitor CF3B; the second end T32 and the fourth end T34 of the third basic unit are electrically connected with the first end T21 of the second basic unit, the third end T33 of the third basic unit is electrically connected with the first plate of the third capacitor CF2A, and the fifth end T35 of the third basic unit is electrically connected with the first plate of the fourth capacitor CF2B; the second end T22 of the second basic unit is electrically connected with the first plate of the first capacitor CF1A, the third end T23 of the second basic unit is electrically connected with the first plate of the second capacitor CF1B, and the first end T11 of the first basic unit is used as the output end OUT of the multi-ratio switched-capacitor voltage conversion circuit 1000 and is used for outputting the output voltage VOUT.

[0030] The switch assembly includes a first switch assembly 10, a second switch assembly 20, a third switch assembly 30, and each cascade switch assembly.

[0031] The switch assembly is used for controlling the connection relationship among each first cascade capacitor, each second cascade capacitor, the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A, and the sixth capacitor CF3B.

[0032] The multi-ratio switched-capacitor voltage conversion circuit 1000 is used for converting the input voltage VIN into the output voltage VOUT, and the input voltage VIN is (2N+6) times of the output voltage VOUT.

[0033] The multi-ratio switched-capacitor voltage conversion circuit in the application can be a circuit module or can be applied in a chip as part of a circuit in the chip, and the application does not make specific limitations on this.

[0034] In order to more clearly describe the connection relationship among the N cascade units in the second unit 200, first, the circuit structure of each cascade unit is described, referring to Figure 4 , Figure 4 A circuit structure schematic diagram of a cascade unit provided in the embodiment of the application is as follows: Figure 4As shown, the cascade unit includes a first cascade capacitor CFNnA, a second cascade capacitor CFNnB, and a cascade switch assembly 40. The cascade unit includes five ports, i.e., a first end TNn1 of the cascade unit, a second end TNn2 of the cascade unit, a third end TNn3 of the cascade unit, a fourth end TNn4 of the cascade unit, and a fifth end TNn5 of the cascade unit. In this application, the second unit 200 includes N cascade units. In order to clearly show the devices and ports in each cascade unit, the nth cascade unit in the N cascade units is denoted by n, and the devices and ports in the nth cascade unit are also denoted by n. Based on the above naming rule, by taking any value of n from 1 to N, the devices and ports in the cascade unit can be denoted by the corresponding reference numerals. For example, referring to Figure 3 In the nth cascade unit (n takes the value of N), the devices and ports can be denoted as: a first cascade capacitor CFNnA, a second cascade capacitor CFNnB, a first end TNN1, a second end TNN2, a third end TNN3, a fourth end TNN4, and a fifth end TNN5. Correspondingly, in the first cascade unit (n takes the value of 1), the devices and ports can be denoted as: a first cascade capacitor CFN1A, a second cascade capacitor CFN1B, a first end TN11, a second end TN12, a third end TN13, a fourth end TN14, and a fifth end TN15. Similarly, in the second cascade unit (n takes the value of 2), the devices and ports can be denoted as: a first cascade capacitor CFN2A, a second cascade capacitor CFN2B, a first end TN21, a second end TN22, a third end TN23, a fourth end TN24, and a fifth end TN25.

[0035] Referring to Figure 3 For the N cascade units, the electrical connection relationship between the adjacent two cascade units can be denoted as: the first end TNN1 of the Nth cascade unit in the N cascade units is the input end IN of the multi-ratio switched-capacitor voltage conversion circuit 1000, for connecting the input voltage VIN, the second end TNN2 of the Nth cascade unit and the fourth end TNN4 of the Nth cascade unit are both electrically connected to the first end TN(n-1)1 of the N-1th cascade unit in the N cascade units; the third end TNN3 of the Nth cascade unit is electrically connected to the first plate of the first cascade capacitor CFN(n-1)A in the N-1th cascade unit, and the fifth end TNN5 of the Nth cascade unit is electrically connected to the first plate of the second cascade capacitor CFN(n-1)B in the N-1th cascade unit.

[0036] Based on the above N cascade units in the second unit, and the electrical connection relationship between the first basic unit, the second basic unit, and the third basic unit in the second unit. Referring to Figure 4The connection relationship between the first cascaded capacitor CFNnA and the second cascaded capacitor CFNnB can be controlled by the cascaded switch assembly 40, and the connection relationship between each first cascaded capacitor CFNnA and each second cascaded capacitor CFNnB can be controlled by the cascaded switch assembly of each cascaded unit. Referring to Figure 3 The connection relationship between the first capacitor CF1A and the second capacitor CF1B can be controlled by the first switch assembly 10, the connection relationship between the third capacitor CF2A and the fourth capacitor CF2B can be controlled by the second switch assembly 20, and the connection relationship between the fifth capacitor CF3A and the sixth capacitor CF3B can be controlled by the third switch assembly 30. Since the switch assembly includes the first switch assembly 10, the second switch assembly 20, the third switch assembly 30, and each cascaded switch assembly, the connection relationship between each first cascaded capacitor, each second cascaded capacitor, the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A, and the sixth capacitor CF3B can be controlled by the switch assembly.

[0037] Based on the characteristics of storing and releasing electric energy of each capacitor, the input voltage and the output voltage are converted in proportion. The multi-ratio switched capacitor voltage conversion circuit in the application can convert the input voltage VIN into the output voltage VOUT, and the input voltage VIN is (2N+6) times of the output voltage VOUT. With the increase of the value of N, a higher voltage ratio can be achieved. For example, when N=1, the voltage ratio between the input voltage VIN and the output voltage VOUT can be 8:1; when N=2, the voltage ratio between the input voltage VIN and the output voltage VOUT can be 10:1; when N=3, the voltage ratio between the input voltage VIN and the output voltage VOUT can be 12:1. With the increase of the number of cascaded units included in the second unit, a higher voltage ratio can be achieved, and the number of devices in the multi-ratio switched capacitor voltage conversion circuit will also increase correspondingly.

[0038] In the embodiment of the present application, the multi-ratio switched-capacitor voltage conversion circuit comprises a first unit and a second unit; the first unit comprises a first basic unit, a second basic unit and a third basic unit; the second unit comprises N cascaded units; each cascaded unit comprises a first cascaded capacitor, a second cascaded capacitor and a cascaded switch assembly; the first basic unit comprises a first capacitor, a second capacitor and a first switch assembly, the second basic unit comprises a third capacitor, a fourth capacitor and a second switch assembly, and the third basic unit comprises a fifth capacitor, a sixth capacitor and a third switch assembly; based on the electrical connection relationship between the N cascaded units, the first basic unit, the second basic unit and the third basic unit, the switch assembly comprises the first switch assembly, the second switch assembly, the third switch assembly and each cascaded switch assembly, and the connection relationship between each first cascaded capacitor, each second cascaded capacitor, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor can be controlled through the switch assembly; based on the characteristics of the storage and release of electrical energy of each capacitor, the input voltage can be converted into the output voltage with a voltage conversion ratio of (2N+6):1, different voltage conversion ratios can be achieved according to different values of N, and a higher voltage conversion ratio can be achieved when the value of N increases.

[0039] Referring to Figure 3 , the multi-ratio switched-capacitor voltage conversion circuit further comprises a current source IS and an output capacitor Cout, wherein a first end of the current source IS is electrically connected with an output end OUT of the multi-ratio switched-capacitor voltage conversion circuit, and a second end of the current source IS is grounded; a first end of the output capacitor Cout is electrically connected with the output end OUT of the multi-ratio switched-capacitor voltage conversion circuit, and a second end of the output capacitor Cout is grounded. The output capacitor Cout is used to provide filtering for the output voltage VOUT.

[0040] In a possible embodiment, referring to Figure 4 , the cascaded switch assembly 40 can comprise a first cascaded switch QNn1A, a second cascaded switch QNn2A, a third cascaded switch QNn3A, a fourth cascaded switch QNn4A, a fifth cascaded switch QNn1B, a sixth cascaded switch QNn2B, a seventh cascaded switch QNn3B and an eighth cascaded switch QNn4B.

[0041] The second end of the first cascaded switch QNn1A is electrically connected with the second end of the fifth cascaded switch QNn1B, and serves as a first end TNn1 of the cascaded unit 40; the first end of the first cascaded switch QNn1A is electrically connected with the second end of the third cascaded switch QNn3A and the first plate of the first cascaded capacitor CFNnA respectively, and the first end of the third cascaded switch QNn3A serves as a second end TNn2 of the cascaded unit 40.

[0042] The second plate of the first cascade capacitor CFNnA is electrically connected with the second end of the second cascade switch QNn2A and the first end of the fourth cascade switch QNn4A respectively, and the second end of the fourth cascade switch QNn4A is the third end TNn3 of the cascade unit 40.

[0043] The first end of the fifth cascade switch QNn1B is electrically connected with the second end of the seventh cascade switch QNn3B and the first plate of the second cascade capacitor CFNnB respectively, and the first end of the seventh cascade switch QNn3B is the fourth end TNn4 of the cascade unit 40.

[0044] The second plate of the second cascade capacitor CFNnB is electrically connected with the second end of the sixth cascade switch QNn2B and the first end of the eighth cascade switch QNn4B respectively, and the second end of the eighth cascade switch QNn4B is the fifth end TNn5 of the cascade unit 40.

[0045] The first end of the second cascade switch QNn2A and the first end of the sixth cascade switch QNn2B are both grounded.

[0046] Based on the naming rules of the devices and ports in the N cascade units, the naming rules of the devices in the cascade switch assembly in each cascade unit can be obtained, for example, referring to Figure 3 In the cascade switch assembly in the Nth cascade unit (n is N), the first cascade switch QNN1A, the second cascade switch QNN2A, the third cascade switch QNN3A, the fourth cascade switch QNN4A, the fifth cascade switch QNN1B, the sixth cascade switch QNN2B, the seventh cascade switch QNN3B and the eighth cascade switch QNN4B can be represented; correspondingly, in the cascade switch assembly in the first cascade unit (n is 1), the first cascade switch QN11A, the second cascade switch QN12A, the third cascade switch QN13A, the fourth cascade switch QN14A, the fifth cascade switch QN11B, the sixth cascade switch QN12B, the seventh cascade switch QN13B and the eighth cascade switch QN14B can be represented. Similarly, in the cascade switch assembly in the second cascade unit (n is 2), the first cascade switch QN21A, the second cascade switch QN22A, the third cascade switch QN23A, the fourth cascade switch QN24A, the fifth cascade switch QN31B, the sixth cascade switch QN32B, the seventh cascade switch QN33B and the eighth cascade switch QN34B can be represented.

[0047] The types of the first cascaded switch QNn1A, the second cascaded switch QNn2A, the third cascaded switch QNn3A, the fourth cascaded switch QNn4A, the fifth cascaded switch QNn1B, the sixth cascaded switch QNn2B, the seventh cascaded switch QNn3B, and the eighth cascaded switch QNn4B can be any one of a gallium nitride transistor, a bipolar junction transistor, an insulated gate bipolar transistor, a metal-oxide-semiconductor field effect transistor, a field-controlled thyristor, a gate turn-off thyristor, a transmission gate, and a back-to-back transistor.

[0048] The first cascaded switch QNn1A, the second cascaded switch QNn2A, the third cascaded switch QNn3A, the fourth cascaded switch QNn4A, the fifth cascaded switch QNn1B, the sixth cascaded switch QNn2B, the seventh cascaded switch QNn3B, and the eighth cascaded switch QNn4B in the present application can select an N-type transistor or a P-type transistor, and the present application does not make a specific limitation thereon.

[0049] When each cascaded switch is a transistor, in a specific embodiment, the control ends of the transistors are generally controlled by a control circuit to control the switching states of the cascaded switches. Specifically, by applying different levels to the control ends of the transistors, the transistors can be in a conducting state or an off state. For example, when each cascaded switch is an N-type MOS tube, by applying a high level to the gate of the N-type MOS tube, the N-type MOS tube can be controlled to be in a conducting state. Similarly, by applying a low level to the gate of the N-type MOS tube, the N-type MOS tube can be controlled to be in an off state. When each cascaded switch is a P-type MOS tube, by applying a high level to the gate of the P-type MOS tube, the P-type MOS tube can be controlled to be in an off state. Similarly, by applying a low level to the gate of the P-type MOS tube, the P-type MOS tube can be controlled to be in a conducting state.

[0050] In a possible embodiment, referring to Figure 3 The third switch assembly 30 includes a first switch Q1A, a second switch Q2A, a third switch Q3A, a fourth switch Q4A, a fifth switch Q1B, a sixth switch Q2B, a seventh switch Q3B, and an eighth switch Q4B.

[0051] The second end of the first switch Q1A is electrically connected to the second end of the fifth switch Q1B, and serves as a first end T31 of the third basic unit. The first end of the first switch Q1A is electrically connected to the second end of the third switch Q3A and the first plate of the fifth capacitor CF3A, respectively. The first end of the third switch Q3A serves as a second end T32 of the third basic unit.

[0052] The second plate of the fifth capacitor CF3A is electrically connected with the second end of the second switch tube Q2A and the first end of the fourth switch tube Q4A respectively, and the second end of the fourth switch tube Q4A is the third end T33 of the third basic unit.

[0053] The first end of the fifth switch tube Q1B is electrically connected with the second end of the seventh switch tube Q3B and the first plate of the sixth capacitor CF3B respectively, and the first end of the seventh switch tube Q3B is the fourth end T34 of the third basic unit.

[0054] The second plate of the sixth capacitor CF3B is electrically connected with the second end of the sixth switch tube Q2B and the first end of the eighth switch tube Q4B respectively, and the second end of the eighth switch tube Q4B is the fifth end T35 of the third basic unit.

[0055] The first end of the second switch tube Q2A and the first end of the sixth switch tube Q2B are grounded.

[0056] The types of the first switch tube Q1A, the second switch tube Q2A, the third switch tube Q3A, the fourth switch tube Q4A, the fifth switch tube Q1B, the sixth switch tube Q2B, the seventh switch tube Q3B and the eighth switch tube Q4B can be any one of gallium nitride transistor, bipolar junction transistor, insulated gate bipolar transistor, metal-oxide-semiconductor field effect transistor, field-controlled thyristor, gate turn-off thyristor, transmission gate and back-to-back transistor.

[0057] The first switch tube Q1A, the second switch tube Q2A, the third switch tube Q3A, the fourth switch tube Q4A, the fifth switch tube Q1B, the sixth switch tube Q2B, the seventh switch tube Q3B and the eighth switch tube Q4B in the present application can select N-type transistor or P-type transistor, which is not limited in the present application.

[0058] When each switch tube is a transistor, in a specific embodiment, the control ends of each transistor are usually controlled by a control circuit to realize the control of the switching state of each cascade switch. Specifically, by applying different levels to the control end of the transistor, it can be in the on state or off state. The principle is the same as the above principle when each cascade switch is a transistor, which will not be repeated here.

[0059] In a possible embodiment, referring to Figure 3 , the second switch assembly 20 includes a ninth switch tube Q6A, a tenth switch tube Q7A, an eleventh switch tube Q8A, a twelfth switch tube Q5A, a thirteenth switch tube Q6B, a fourteenth switch tube Q7B, a fifteenth switch tube Q8B and a sixteenth switch tube Q5B.

[0060] The second end of the ninth switch tube Q6A is electrically connected with the second end of the thirteenth switch tube Q6B, and serves as the first end T21 of the second basic unit, and the first end of the ninth switch tube Q6A is electrically connected with the second end of the tenth switch tube Q7A and the first plate of the third capacitor CF2A respectively.

[0061] The first end of the tenth switch tube Q7A is electrically connected with the second end of the eleventh switch tube Q8A, and serves as the second end T22 of the second basic unit, and the first end of the eleventh switch tube Q8A is electrically connected with the second plate of the third capacitor CF2A and the second end of the twelfth switch tube Q5A respectively.

[0062] The first end of the thirteenth switch tube Q6B is electrically connected with the second end of the fourteenth switch tube Q7B and the first plate of the fourth capacitor CF2B respectively, the first end of the fourteenth switch tube Q7B is electrically connected with the second end of the fifteenth switch tube Q8B, and serves as the third end T23 of the second basic unit.

[0063] The first end of the fifteenth switch tube Q8B is electrically connected with the second plate of the fourth capacitor CF2B and the second end of the sixteenth switch tube Q5B respectively.

[0064] The first end of the twelfth switch tube Q5A and the first end of the sixteenth switch tube Q5B are grounded.

[0065] The types of the ninth switch tube Q6A, the tenth switch tube Q7A, the eleventh switch tube Q8A, the twelfth switch tube Q5A, the thirteenth switch tube Q6B, the fourteenth switch tube Q7B, the fifteenth switch tube Q8B and the sixteenth switch tube Q5B can be any one of gallium nitride transistor, bipolar junction transistor, insulated gate bipolar transistor, metal-oxide-semiconductor field effect transistor, field-controlled thyristor, gate turn-off thyristor, transmission gate and back-to-back transistor.

[0066] The ninth switch tube Q6A, the tenth switch tube Q7A, the eleventh switch tube Q8A, the twelfth switch tube Q5A, the thirteenth switch tube Q6B, the fourteenth switch tube Q7B, the fifteenth switch tube Q8B and the sixteenth switch tube Q5B in the present application can select N-type transistor, or can select P-type transistor, which is not limited in the present application.

[0067] In a possible embodiment, referring to Figure 3 , the first switch assembly 10 comprises: a seventeenth switch tube Q9A, an eighteenth switch tube Q10A, a nineteenth switch tube Q11A, a twentieth switch tube Q9B, a twenty-first switch tube Q10B and a twenty-second switch tube Q11B.

[0068] The second end of the seventeenth switch tube Q9A is electrically connected with the first plate of the first capacitor CF1A, the first end of the seventeenth switch tube Q9A is electrically connected with the second end of the eighteenth switch tube Q10A, and the first end T11 of the first basic unit.

[0069] The first end of the eighteenth switch tube Q10A is electrically connected with the second plate of the first capacitor CF1A and the second end of the nineteenth switch tube Q11A respectively, and the second end of the twentieth switch tube Q9B is electrically connected with the first plate of the second capacitor CF1B.

[0070] The first end of the twentieth switch tube Q9B is electrically connected with the second end of the twenty-first switch tube Q10B and the first end T11 of the first basic unit respectively, the first end of the twenty-first switch tube Q10B is electrically connected with the second plate of the second capacitor CF1B and the second end of the twenty-second switch tube Q11B respectively.

[0071] The first end of the nineteenth switch tube Q11A and the first end of the twenty-second switch tube Q11B are both grounded.

[0072] The types of the seventeenth switch tube Q9A, the eighteenth switch tube Q10A, the nineteenth switch tube Q11A, the twentieth switch tube Q9B, the twenty-first switch tube Q10B and the twenty-second switch tube Q11B can be any one of gallium nitride transistor, bipolar junction transistor, insulated gate bipolar transistor, metal-oxide-semiconductor field effect transistor, field-controlled thyristor, gate turn-off thyristor, transmission gate and back-to-back transistor.

[0073] The seventeenth switch tube Q9A, the eighteenth switch tube Q10A, the nineteenth switch tube Q11A, the twentieth switch tube Q9B, the twenty-first switch tube Q10B and the twenty-second switch tube Q11B in the present application can select N-type transistor or P-type transistor, which is not limited in the present application.

[0074] In a possible embodiment, referring to Figure 3 , based on the electrical connection relationship between the first unit 100 and the second unit 200, the multi-ratio switched capacitor voltage conversion circuit 1000 is used for converting the input voltage VIN into the output voltage VOUT in the first mode, the input voltage VIN is (2N+6) times of the output voltage VOUT; wherein the first mode is that the switching assembly switches between the first state and the second state. The states of each switch tube in the first state and the second state will be described below.

[0075] Specifically, in the first state, the first switch Q1A, the fourth switch Q4A, the sixth switch Q2B, the seventh switch Q3B, the sixteenth switch Q5B, the ninth switch Q6A, the fourteenth switch Q7B, the eleventh switch Q8A, the twentieth switch Q9B, the eighteenth switch Q10A, the twenty-second switch Q11B, each first cascade switch QNn1A, each fourth cascade switch QNn4A, each sixth cascade switch QNn2B, and each seventh cascade switch QNn3B are turned on; the second switch Q2A, the third switch Q3A, the fifth switch Q1B, the eighth switch Q4B, the twelfth switch Q5A, the tenth switch Q7A, the thirteenth switch Q6B, the fifteenth switch Q8B, the seventeenth switch Q9A, the nineteenth switch Q11A, the twenty-first switch Q10B, each second cascade switch QNn2A, each third cascade switch QNn3A, each fifth cascade switch QNn1B, and each eighth cascade switch QNn4B are turned off.

[0076] In the second state, the second switch Q2A, the third switch Q3A, the fifth switch Q1B, the eighth switch Q4B, the twelfth switch Q5A, the tenth switch Q7A, the thirteenth switch Q6B, the fifteenth switch Q8B, the seventeenth switch Q9A, the nineteenth switch Q11A, the twenty-first switch Q10B, each second cascade switch QNn2A, each third cascade switch QNn3A, each fifth cascade switch QNn1B, and each eighth cascade switch QNn4B are turned on; the first switch Q1A, the fourth switch Q4A, the sixth switch Q2B, the seventh switch Q3B, the sixteenth switch Q5B, the ninth switch Q6A, the fourteenth switch Q7B, the eleventh switch Q8A, the twentieth switch Q9B, the eighteenth switch Q10A, the twenty-second switch Q11B, each first cascade switch QNn1A, each fourth cascade switch QNn4A, each sixth cascade switch QNn2B, and each seventh cascade switch QNn3B are turned off.

[0077] The value of all n in each first cascaded switch QNn1A, each fourth cascaded switch QNn4A, each sixth cascaded switch QNn2B, each seventh cascaded switch QNn3B, each second cascaded switch QNn2A, each third cascaded switch QNn3A, each fifth cascaded switch QNn1B, and each eighth cascaded switch QNn4B ranges from 1 to any value in N, which is used to represent all cascaded switches in N cascaded switch assemblies in N cascaded units. For example, each first cascaded switch QNn1A represents the first cascaded switch QNN1A in the Nth cascaded switch assembly, the first cascaded switch QN(N-1)1A in the (N-1)th cascaded switch assembly, the first cascaded switch QN(N-2)1A in the (N-2)th cascaded switch assembly,..., and the first cascaded switch QN11A in the first cascaded switch assembly. Each fourth cascaded switch QNn4A represents the fourth cascaded switch QNN4A in the Nth cascaded switch assembly, the fourth cascaded switch QN(N-1)4A in the (N-1)th cascaded switch assembly, the fourth cascaded switch QN(N-2)4A in the (N-2)th cascaded switch assembly,..., and the fourth cascaded switch QN14A in the first cascaded switch assembly.

[0078] In the embodiments of the present application, by controlling each switch (or switch tube) in the switch assembly to switch between the first state and the second state, the connection relationship between each first cascaded capacitor, each second cascaded capacitor, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, and the sixth capacitor is controlled; based on the characteristics of the storage and release of electrical energy of each capacitor, the multi-ratio switched capacitor voltage conversion circuit converts the input voltage into the output voltage according to the voltage conversion ratio of (2N+6):1.

[0079] In a possible embodiment, in the case where the second unit includes N cascaded units and an (N+1)th cascaded unit, that is, in the case where Figure 3 , an (N+1)th cascaded unit is further superimposed. The circuit structure of the (N+1)th cascaded unit is the same as that of the cascaded unit, see Figure 4 , the reference numerals of each device in the (N+1)th cascaded unit can be represented by replacing n in each device in Figure 4 with (N+1).

[0080] At this time, if the variable ratio switch capacitor voltage conversion circuit includes N cascaded units in the second unit, the input voltage can be converted into the output voltage, the input voltage VIN is X times of the output voltage VOUT (i.e. VIN = X*VOUT), the voltage on the first cascaded capacitor CFNNA of the Nth cascaded unit and the voltage on the second cascaded capacitor CFNNB are both Y times of the output voltage VOUT (i.e. Y*VOUT); and when the third switch assembly is in the third state, the cascaded switch assembly in the N+1th cascaded unit is in the fourth state; when the third switch assembly is in the fifth state, the cascaded switch assembly in the N+1th cascaded unit is in the sixth state.

[0081] In the third state, the first switch Q1A, the fourth switch Q4A, the sixth switch Q2B and the seventh switch Q3B are controlled to be turned on; the second switch Q2A, the third switch Q3A, the fifth switch Q1B and the eighth switch Q4B are controlled to be turned off.

[0082] In the fourth state, the first cascaded switch QN(N+1)1A in the N+1th cascaded unit, the fourth cascaded switch QN(N+1)4A in the N+1th cascaded unit, the sixth cascaded switch QN(N+1)2B in the N+1th cascaded unit and the seventh cascaded switch QN(N+1)3B in the N+1th cascaded unit are controlled to be turned on; the second cascaded switch QN(N+1)2A in the N+1th cascaded unit, the third cascaded switch QN(N+1)3A in the N+1th cascaded unit, the fifth cascaded switch QN(N+1)1B in the N+1th cascaded unit and the eighth cascaded switch QN(N+1)4B in the N+1th cascaded unit are controlled to be turned off.

[0083] In the fifth state, the second switch Q2A, the third switch Q3A, the fifth switch Q1B and the eighth switch Q4B are controlled to be turned on; the first switch Q1A, the fourth switch Q4A, the sixth switch Q2B and the seventh switch Q3B are controlled to be turned off.

[0084] In the sixth state, the second cascaded switch QN(N+1)2A in the N+1th cascaded unit, the third cascaded switch QN(N+1)3A in the N+1th cascaded unit, the fifth cascaded switch QN(N+1)1B in the N+1th cascaded unit and the eighth cascaded switch QN(N+1)4B in the N+1th cascaded unit are controlled to be turned on; the first cascaded switch QN(N+1)1A in the N+1th cascaded unit, the fourth cascaded switch QN(N+1)4A in the N+1th cascaded unit, the sixth cascaded switch QN(N+1)2B in the N+1th cascaded unit and the seventh cascaded switch QN(N+1)3B in the N+1th cascaded unit are controlled to be turned off.

[0085] Comparison Figure 3 andFigure 4 It can be known that the circuit structure of the cascade unit is the same as that of the third basic unit. By comparing the states of each switch and each switch in the third state, the fourth state, the fifth state and the sixth state, it can be known that the switching states of the cascade switch assembly and the third switch assembly in the N+1 cascade unit are the same, that is, at the same time, each cascade switch in the cascade switch assembly in the N+1 cascade unit and each switch tube in the third switch assembly are in the same state, which can be in the on state or in the off state at the same time. Under this condition, by controlling whether the state of the first cascade switch in the N cascade unit is the same as that of the first cascade switch in the N+1 cascade unit and whether the state of the fifth cascade switch in the N cascade unit is the same as that of the fifth cascade switch in the N+1 cascade unit, different voltage transformation ratios can be realized, that is, in the second mode and the third mode, different voltage transformation ratios between the input voltage VIN and the output voltage VOUT can be realized.

[0086] Specifically, the multi-ratio switched capacitor voltage conversion circuit is used to convert the input voltage VIN into the output voltage VOUT in the second mode, and the input voltage is 2*X times of the output voltage; wherein in the second mode, the state of the first cascade switch QNN1A in the N cascade unit is the same as that of the first cascade switch QN(N+1)1A in the N+1 cascade unit, and the state of the fifth cascade switch QNN1B in the N cascade unit is the same as that of the fifth cascade switch QN(N+1)1B in the N+1 cascade unit. Wherein, the same state means that the first cascade switch QNN1A in the N cascade unit and the first cascade switch QN(N+1)1A in the N+1 cascade unit are in the on state or the off state at the same time.

[0087] The multi-ratio switched-capacitor voltage conversion circuit is also used for converting the input voltage VIN into the output voltage VOUT in the third mode, the input voltage VIN being X+Y times of the output voltage VOUT; wherein in the third mode, the first cascaded switch QNN1A in the Nth cascaded unit is opposite to the first cascaded switch QN(N+1)1A in the (N+1)th cascaded unit in state, and the fifth cascaded switch QNN1B in the Nth cascaded unit is opposite to the fifth cascaded switch QN(N+1)1B in the (N+1)th cascaded unit in state. Wherein opposite in state means that at the same time, one of the first cascaded switch QNN1A in the Nth cascaded unit and the first cascaded switch QN(N+1)1A in the (N+1)th cascaded unit is in the on state, and the other is in the off state, for example, if the first cascaded switch QNN1A in the Nth cascaded unit is in the on state, then the first cascaded switch QN(N+1)1A in the (N+1)th cascaded unit is in the off state; if the first cascaded switch QNN1A in the Nth cascaded unit is in the off state, then the first cascaded switch QN(N+1)1A in the (N+1)th cascaded unit is in the on state.

[0088] In the embodiment of the present application, if the multi-ratio switched-capacitor voltage conversion circuit includes N cascaded units in the second unit, the input voltage VIN and the output voltage VOUT can be converted according to the voltage conversion ratio of X: 1 (i.e. VIN=X*VOUT), and the voltage on the first cascaded capacitor CFNNA in the Nth cascaded unit and the voltage on the second cascaded capacitor CFNNB are both Y*VOUT. On this basis, if a (N+1)th cascaded unit is added, and the switching states of the cascaded switch components and the third switch components in the (N+1)th cascaded unit are the same (i.e. at the same time, the states of the switch tubes at the same positions of the cascaded switch components and the third switch components in the (N+1)th cascaded unit are the same, which can be compared with the third state and the fourth state, or the fifth state and the sixth state).

[0089] Under this condition, if the first cascaded switch QNN1A in the Nth cascaded unit and the first cascaded switch QN(N+1)1A in the (N+1)th cascaded unit are the same in state, and the fifth cascaded switch QNN1B in the Nth cascaded unit and the fifth cascaded switch QN(N+1)1B in the (N+1)th cascaded unit are the same in state, the multi-ratio switched-capacitor voltage conversion circuit can convert the input voltage VIN into the output voltage VOUT according to the voltage conversion ratio of 2*X: 1. At this time, the voltage on the first cascaded capacitor CFN(N+1)A in the (N+1)th cascaded unit and the voltage on the second cascaded capacitor CFN(N+1)B are both X*VOUT.

[0090] If the state of the first cascaded switch QNN1A in the Nth cascaded unit is opposite to the state of the first cascaded switch QN(N+1)1A in the (N+1)th cascaded unit, and the state of the fifth cascaded switch QNN1B in the Nth cascaded unit is opposite to the state of the fifth cascaded switch QN(N+1)1B in the (N+1)th cascaded unit, the multi-ratio switched-capacitor voltage conversion circuit can convert the input voltage VIN into the output voltage VOUT according to a voltage ratio of (X+Y):1. At this time, the voltage on the first cascaded capacitor CFN(N+1)A in the (N+1)th cascaded unit and the voltage on the second cascaded capacitor CFN(N+1)B are both Y*VOUT.

[0091] In the embodiments of the present application, in the case that the second unit includes N cascaded units and an (N+1)th cascaded unit, by controlling the states of the cascaded switch components in the Nth cascaded unit and the (N+1)th cascaded unit, conversion between the input voltage VIN and the output voltage VOUT according to two different voltage ratios of 2*X:1 or (X+Y):1 can be realized.

[0092] Based on all the above embodiments, the second unit in the present application includes N cascaded units; wherein N is an integer greater than or equal to 1. In addition, the present application also provides an embodiment when N=0, that is, in the case that the multi-ratio switched-capacitor voltage conversion circuit 1000 only includes the first unit 100, at this time, the switch components include the first switch component 10, the second switch component 20, and the third switch component 30.

[0093] The switch components are used to control the connection relationship between the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A, and the sixth capacitor CF3B.

[0094] The multi-ratio switched-capacitor voltage conversion circuit 1000 is used to convert the input voltage VIN into the output voltage VOUT, and the input voltage VIN is 6 times or 4 times the output voltage VOUT. That is, in the case that the multi-ratio switched-capacitor voltage conversion circuit 1000 only includes the first unit 100, the voltage ratio between the input voltage VIN and the output voltage VOUT can be 6:1 or 4:1.

[0095] In a possible embodiment, the multi-ratio switched-capacitor voltage conversion circuit is used to convert the input voltage VIN into the output voltage VOUT in the fourth mode, and the input voltage VIN is 6 times the output voltage VOUT; wherein the fourth mode is that the switch components are switched between the seventh state and the eighth state.

[0096] Referring to Figure 5 , Figure 5 A state diagram of the switch components in the seventh state provided by the embodiments of the present application is as follows:Figure 5 As shown in the seventh state, the first switch tube Q1A, the fourth switch tube Q4A, the sixth switch tube Q2B, the seventh switch tube Q3B, the sixteenth switch tube Q5B, the ninth switch tube Q6A, the fourteenth switch tube Q7B, the eleventh switch tube Q8A, the twentieth switch tube Q9B, the eighteenth switch tube Q10A, and the twenty-second switch tube Q11B are controlled to be turned on; the second switch tube Q2A, the third switch tube Q3A, the fifth switch tube Q1B, the eighth switch tube Q4B, the twelfth switch tube Q5A, the tenth switch tube Q7A, the thirteenth switch tube Q6B, the fifteenth switch tube Q8B, the seventeenth switch tube Q9A, the nineteenth switch tube Q11A, and the twenty-first switch tube Q10B are controlled to be turned off.

[0097] Referring to Figure 6 , Figure 6 A state diagram of a switch assembly in the eighth state provided by the embodiment of the application is shown in Figure 6 As shown in the eighth state, the second switch tube Q2A, the third switch tube Q3A, the fifth switch tube Q1B, the eighth switch tube Q4B, the twelfth switch tube Q5A, the tenth switch tube Q7A, the thirteenth switch tube Q6B, the fifteenth switch tube Q8B, the seventeenth switch tube Q9A, the nineteenth switch tube Q11A, and the twenty-first switch tube Q10B are controlled to be turned on; the first switch tube Q1A, the fourth switch tube Q4A, the sixth switch tube Q2B, the seventh switch tube Q3B, the sixteenth switch tube Q5B, the ninth switch tube Q6A, the fourteenth switch tube Q7B, the eleventh switch tube Q8A, the twentieth switch tube Q9B, the eighteenth switch tube Q10A, and the twenty-second switch tube Q11B are controlled to be turned off.

[0098] Figure 5 and Figure 6 The device is in the on state, and the light-colored device is in the off state. Referring to Figure 5 and Figure 6 The multiple-ratio switch capacitor voltage conversion circuit controls the switch assembly to switch between the seventh state and the eighth state, and in different states, by controlling the connection relationship between the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A, and the sixth capacitor CF3B, and by using the characteristics of storing and releasing electric energy of each capacitor in different states, the input voltage VIN is converted into the output voltage VOUT according to the ratio, and the input voltage VIN is converted into the output voltage VOUT which is 6 times the input voltage VIN.

[0099] Referring to Figure 5 and Figure 6In the switching process between the seventh state and the eighth state of the variable-ratio switched-capacitor voltage conversion circuit, each switch tube in the on state can be regarded as a conductor, and each switch tube in the off state can be regarded as an open circuit, so that the connection relationship of the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A and the sixth capacitor CF3B can be obtained. The first plate of the capacitor in the application is the positive electrode of the capacitor, and the second plate of the capacitor is the negative electrode of the capacitor.

[0100] Specifically, referring to Figure 7 , Figure 7 The fourth mode provided by the embodiment of the application is a variable-ratio switched-capacitor voltage conversion circuit, and the corresponding connection relationship diagram when the seventh state and the eighth state are switched is shown in Figure 7 The connection relationship between the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A and the sixth capacitor CF3B in the seventh state is that: the positive electrode of the fifth capacitor CF3A is electrically connected with the input end IN of the variable-ratio switched-capacitor voltage conversion circuit, for connecting the input voltage VIN, the negative electrode of the fifth capacitor CF3A is electrically connected with the positive electrode of the sixth capacitor CF3B and the positive electrode of the third capacitor CF2A, the negative electrode of the third capacitor CF2A is electrically connected with the positive electrode of the first capacitor CF1A, the negative electrode of the first capacitor CF1A is electrically connected with the output end OUT of the variable-ratio switched-capacitor voltage conversion circuit, the positive electrode of the second capacitor CF1B and the positive electrode of the fourth capacitor CF2B, the negative electrode of the sixth capacitor CF3B, the negative electrode of the second capacitor CF1B and the negative electrode of the fourth capacitor CF2B are all grounded.

[0101] Referring to Figure 7 The connection relationship between the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A and the sixth capacitor CF3B in the eighth state is that: the positive electrode of the sixth capacitor CF3B is electrically connected with the input end IN of the variable-ratio switched-capacitor voltage conversion circuit, for connecting the input voltage VIN, the negative electrode of the sixth capacitor CF3B is electrically connected with the positive electrode of the fifth capacitor CF3A and the positive electrode of the fourth capacitor CF2B, the negative electrode of the fourth capacitor CF2B is electrically connected with the positive electrode of the second capacitor CF1B, the negative electrode of the second capacitor CF1B is electrically connected with the output end OUT of the variable-ratio switched-capacitor voltage conversion circuit, the positive electrode of the first capacitor CF1A and the positive electrode of the third capacitor CF2A, the negative electrode of the fifth capacitor CF3A, the negative electrode of the first capacitor CF1A and the negative electrode of the third capacitor CF2A are all grounded.

[0102] Referring to Figure 7, the voltage on the fifth capacitor CF3A and the voltage on the sixth capacitor CF3B are the same, the voltage on the third capacitor CF2A and the voltage on the fourth capacitor CF2B are the same, and the voltage on the first capacitor CF1A and the voltage on the second capacitor CF1B are the same. In the seventh state, since the voltage on the fourth capacitor CF2B is 1*VOUT, the voltage on the second capacitor CF1B is equal to the voltage on the fourth capacitor CF2B, which is also 1*VOUT, the voltage on the third capacitor CF2A is 1*VOUT, the voltage on the first capacitor CF1A is also 1*VOUT, and the voltage on the sixth capacitor CF3B is equal to the sum of the voltage on the third capacitor CF2A, the voltage on the first capacitor CF1A, and the voltage on the fourth capacitor CF2B, that is, the voltage on the sixth capacitor CF3B is 3*VOUT, and the voltage on the fifth capacitor CF3A is also 3*VOUT. The input voltage VIN is equal to the sum of the voltage on the fifth capacitor CF3A, the voltage on the third capacitor CF2A, the voltage on the first capacitor CF1A, and the voltage on the fourth capacitor CF2B, and the input voltage VIN can be expressed by the expression: VIN=3*VOUT+1*VOUT+1*VOUT+1*VOUT=6*VOUT, and the voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be achieved by the multi-ratio switched capacitor voltage conversion circuit.

[0103] Similarly, referring to Figure 7 , in the eighth state, since the voltage on the first capacitor CF1A is 1*VOUT, the voltage on the first capacitor CF1A is equal to the voltage on the third capacitor CF2A, which is also 1*VOUT, the voltage on the fourth capacitor CF2B is 1*VOUT, and the voltage on the second capacitor CF1B is also 1*VOUT, the voltage on the fifth capacitor CF3A is equal to the sum of the voltage on the fourth capacitor CF2B, the voltage on the second capacitor CF1B, and the voltage on the third capacitor CF2A, that is, the voltage on the fifth capacitor CF3A is 3*VOUT, and the voltage on the sixth capacitor CF3B is also 3*VOUT. The input voltage VIN is equal to the sum of the voltage on the sixth capacitor CF3B, the voltage on the fourth capacitor CF2B, the voltage on the second capacitor CF1B, and the voltage on the third capacitor CF2A, and the input voltage VIN can be expressed by the expression: VIN=3*VOUT+1*VOUT+1*VOUT+1*VOUT=6*VOUT. That is, VIN:VOUT=6:1, and the voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be achieved by the multi-ratio switched capacitor voltage conversion circuit.

[0104] Based on the above principle, in the fourth mode, the multi-ratio switched capacitor voltage conversion circuit controls the switching component to switch between the seventh and eighth states, which can realize the conversion of the input voltage VIN into the output voltage VOUT, where the input voltage VIN is 6 times the output voltage VOUT.

[0105] In one possible embodiment, the multi-ratio switched capacitor voltage conversion circuit 1000 is used to convert the input voltage into an output voltage in a fifth mode, wherein the input voltage is four times the output voltage; wherein the fifth mode is a switching component switching between a ninth state and a tenth state.

[0106] See Figure 8 , Figure 8 A schematic diagram of the state of a switching component in a ninth state is provided for an embodiment of this application, as shown below. Figure 8 As shown, in the ninth state, the first switch Q1A, the fourth switch Q4A, the sixth switch Q2B, the seventh switch Q3B, the sixteenth switch Q5B, the thirteenth switch Q6B, the fourteenth switch Q7B, the eleventh switch Q8A, the eighteenth switch Q10A, the twentieth switch Q9B, and the twenty-second switch Q11B are all turned on; the fifth switch Q1B, the eighth switch Q4B, the second switch Q2A, the third switch Q3A, the twelfth switch Q5A, the ninth switch Q6A, the tenth switch Q7A, the fifteenth switch Q8B, the seventeenth switch Q9A, the nineteenth switch Q11A, and the twenty-first switch Q10B are all turned off.

[0107] See Figure 9 , Figure 9 A schematic diagram of the state of a switching component in the tenth state is provided for an embodiment of this application, as shown below. Figure 9 As shown, in the tenth state, the fifth switch Q1B, the eighth switch Q4B, the second switch Q2A, the third switch Q3A, the twelfth switch Q5A, the ninth switch Q6A, the tenth switch Q7A, the fifteenth switch Q8B, the seventeenth switch Q9A, the nineteenth switch Q11A, and the twenty-first switch Q10B are all turned on; the first switch Q1A, the fourth switch Q4A, the sixth switch Q2B, the seventh switch Q3B, the sixteenth switch Q5B, the thirteenth switch Q6B, the fourteenth switch Q7B, the eleventh switch Q8A, the eighteenth switch Q10A, the twentieth switch Q9B, and the twenty-second switch Q11B are all turned off.

[0108] Figure 8 and Figure 9 In the diagram, dark-colored elements represent the on state of the device, and light-colored elements represent the off state. See also... Figure 8 and Figure 9The multi-ratio switched capacitor voltage conversion circuit controls the switching components to switch between the ninth and tenth states. In different states, by controlling the connection relationship between the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A, and the sixth capacitor CF3B, the circuit utilizes each capacitor to store and release electrical energy in different states, thereby realizing the proportional conversion between the input voltage and the output voltage. The input voltage VIN is converted into the output voltage VOUT, and the input voltage VIN is 4 times the output voltage VOUT.

[0109] See Figure 8 and Figure 9 In the switching process between the ninth and tenth states of the multi-ratio switched capacitor voltage conversion circuit, each switch in the on state can be considered as a wire, and each switch in the off state can be considered as an open circuit. Therefore, the connection relationship between the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A, and the sixth capacitor CF3B can be obtained. In this application, the first plate of the capacitor is the positive terminal, and the second plate of the capacitor is the negative terminal.

[0110] For details, see Figure 10 , Figure 10 This is a schematic diagram illustrating the connection relationship between the ninth and tenth states in the fifth mode provided in this application embodiment. Figure 10 As shown, in the ninth state, the connection relationship between the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A, and the sixth capacitor CF3B is as follows: the positive terminal of the fifth capacitor CF3A is electrically connected to the input terminal IN of the multi-ratio switched capacitor voltage converter circuit, and is used to input the input voltage VIN; the negative terminal of the fifth capacitor CF3A is electrically connected to the positive terminal of the third capacitor CF2A; the negative terminal of the third capacitor CF2A is electrically connected to the positive terminal of the first capacitor CF1A; the negative terminal of the first capacitor CF1A is electrically connected to the output terminal OUT of the multi-ratio switched capacitor voltage converter circuit, the positive terminal of the second capacitor CF1B, the positive terminal of the fourth capacitor CF2B, and the positive terminal of the sixth capacitor CF3B; and the negative terminals of the sixth capacitor CF3B, the second capacitor CF1B, and the fourth capacitor CF2B are all grounded.

[0111] See Figure 10In the tenth state, the connection relationship among the first capacitor CFA, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A and the sixth capacitor CF3B is as follows: the positive electrode of the sixth capacitor CF3B is electrically connected with the input end IN of the multi-ratio switched capacitor voltage conversion circuit, and is used to connect the input voltage VIN; the negative electrode of the sixth capacitor CF3B is electrically connected with the positive electrode of the fourth capacitor CF2B; the negative electrode of the fourth capacitor CF2B is electrically connected with the positive electrode of the second capacitor CF1B; the negative electrode of the second capacitor CF1B is electrically connected with the output end OUT of the multi-ratio switched capacitor voltage conversion circuit, the positive electrode of the first capacitor CFA, the positive electrode of the third capacitor CF2A and the positive electrode of the fifth capacitor CF3A; the negative electrode of the fifth capacitor CF3A, the negative electrode of the first capacitor CFA and the negative electrode of the third capacitor CF2A are grounded.

[0112] Referring to Figure 10 In the switching process between the ninth state and the tenth state of the multi-ratio switched capacitor voltage conversion circuit, the voltage on the fifth capacitor CF3A is equal to the voltage on the sixth capacitor CF3B, the voltage on the third capacitor CF2A is equal to the voltage on the fourth capacitor CF2B, and the voltage on the first capacitor CFA is equal to the voltage on the second capacitor CF1B. In the ninth state, since the voltage on the fourth capacitor CF2B is 1*VOUT, the voltage on the second capacitor CF1B is equal to the voltage on the fourth capacitor CF2B, i.e., 1*VOUT, the voltage on the third capacitor CF2A is 1*VOUT, the voltage on the first capacitor CFA is also 1*VOUT, and the voltage on the sixth capacitor CF3B is equal to the voltage on the fourth capacitor CF2B, i.e., 1*VOUT, the voltage on the fifth capacitor CF3A is also 1*VOUT. The input voltage VIN is equal to the sum of the voltage on the fifth capacitor CF3A, the voltage on the third capacitor CF2A, the voltage on the first capacitor CFA and the voltage on the fourth capacitor CF2B, and the input voltage VIN can be expressed by the following expression: VIN=1*VOUT+1*VOUT+1*VOUT+1*VOUT=4*VOUT. That is, VIN:VOUT=4:1, and the multi-ratio switched capacitor voltage conversion circuit can realize the voltage ratio between the input voltage and the output voltage as 4:1.

[0113] Similarly, referring to Figure 10In the tenth state, since the voltage on the first capacitor CF1A is 1*VOUT, the voltage on the third capacitor CF2A is equal to the voltage on the first capacitor CF1A, which is also 1*VOUT, the voltage on the fourth capacitor CF2B is 1*VOUT, the voltage on the second capacitor CF1B is also 1*VOUT, the voltage on the fifth capacitor CF3A is equal to the voltage on the first capacitor CF1A, that is, the voltage on the fifth capacitor CF3A is also 1*VOUT, and the voltage on the sixth capacitor CF3B is also 1*VOUT. The input voltage VIN is equal to the sum of the voltage on the sixth capacitor CF3B, the voltage on the fourth capacitor CF2B, the voltage on the second capacitor CF1B, and the voltage on the third capacitor CF2A, and the input voltage VIN can be expressed by the expression: VIN = 1*VOUT + 1*VOUT + 1*VOUT + 1*VOUT = 4*VOUT. The voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be achieved by the multi-ratio switched capacitor voltage conversion circuit, which is 4:1.

[0114] Based on the above principle, in the fifth mode, the multi-ratio switched capacitor voltage conversion circuit controls the switching assembly to switch between the ninth state and the tenth state, which can convert the input voltage VIN to the output voltage VOUT, and the input voltage VIN is 4 times the output voltage VOUT.

[0115] In the case of N=0, i.e. in the case that the multi-ratio switched-capacitor voltage conversion circuit 1000 only includes the first unit 100, the multi-ratio switched-capacitor voltage conversion circuit in the embodiment of the present application includes 22 switch tubes and 6 capacitors, i.e. the first switch tube Q1A, the second switch tube Q2A, the third switch tube Q3A, the fourth switch tube Q4A, the fifth switch tube Q1B, the sixth switch tube Q2B, the seventh switch tube Q3B, the eighth switch tube Q4B, the ninth switch tube Q6A, the tenth switch tube Q7A, the eleventh switch tube Q8A, the twelfth switch tube Q5A, the thirteenth switch tube Q6B, the fourteenth switch tube Q7B, the fifteenth switch tube Q8B, the sixteenth switch tube Q5B, the seventeenth switch tube Q9A, the eighteenth switch tube Q10A, the nineteenth switch tube Q11A, the twentieth switch tube Q9B, the twenty-first switch tube Q10B, and the twenty-second switch tube Q11B; the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A, and the sixth capacitor CF3B. By controlling the 22 switch tubes to switch between the seventh state and the eighth state and controlling the connection relationship between the 6 capacitors in the fourth mode, the input voltage is converted into the output voltage with a voltage conversion ratio of 6:1; meanwhile, by controlling the 22 switch tubes to switch between the ninth state and the tenth state and controlling the connection relationship between the 6 capacitors in the fifth mode, the input voltage is converted into the output voltage with a voltage conversion ratio of 4:1. Compared with the related art, the multi-ratio switched-capacitor voltage conversion circuit can achieve a higher voltage conversion ratio without cascading multiple circuits with different voltage conversion ratios, can avoid the reduction of the overall circuit efficiency caused by the inherent loss of multi-stage power conversion, does not waste the overall circuit efficiency, and can achieve a maximum voltage conversion ratio of 6:1 and obtain a larger output current. In addition, the multi-ratio switched-capacitor voltage conversion circuit in the present application is compatible with the voltage conversion ratio of 4:1 while achieving the voltage conversion ratio of 6:1, and covers a larger input-output voltage variation range.

[0116] The application also extends the multi-ratio switched-capacitor voltage conversion circuit including the first unit 100, and in the case that the multi-ratio switched-capacitor voltage conversion circuit further includes a second unit composed of N cascaded units; wherein N is an integer greater than or equal to 1, each cascaded unit includes a first cascaded capacitor, a second cascaded capacitor, and a cascaded switch assembly; since the first basic unit includes the first capacitor CF1A, the second capacitor CF1B, and the first switch assembly 10, the second basic unit includes the third capacitor CF2A, the fourth capacitor CF2B, and the second switch assembly 20, and the third basic unit includes the fifth capacitor CF3A, the sixth capacitor CF3B, and the third switch assembly 30. The switch assembly includes the first switch assembly 10, the second switch assembly 20, the third switch assembly 30, and each cascaded switch assembly. In general, the connection relationship between each first cascaded capacitor, each second cascaded capacitor, the first capacitor CF1A, the second capacitor CF1B, the third capacitor CF2A, the fourth capacitor CF2B, the fifth capacitor CF3A, and the sixth capacitor CF3B is controlled by the switch assembly, so that the multi-ratio switched-capacitor voltage conversion circuit can convert the input voltage VIN into the output voltage VOUT according to a voltage conversion ratio of (2N+6):1.

[0117] On this basis, the application also extends the case that the second unit includes N cascaded units and an (N+1)th cascaded unit. If the multi-ratio switched-capacitor voltage conversion circuit can convert the input voltage VIN and the output voltage VOUT according to a voltage conversion ratio of X:1 when the second unit includes N cascaded units, and the voltage on the first cascaded capacitor CFNNA of the Nth cascaded unit and the voltage on the second cascaded capacitor CFNNB are both Y*VOUT, then if an (N+1)th cascaded unit is added, and the switching states of the cascaded switch assembly and the third switch assembly in the (N+1)th cascaded unit are the same. Under this condition, whether the switching states of the first cascaded switch QNN1A in the Nth cascaded unit and the first cascaded switch QN(N+1)1A in the (N+1)th cascaded unit are the same, and whether the switching states of the fifth cascaded switch QNN1B in the Nth cascaded unit and the fifth cascaded switch QN(N+1)1B in the (N+1)th cascaded unit are the same, further realize the conversion between the input voltage VIN and the output voltage VOUT according to two different voltage conversion ratios of 2*X:1 or (X+Y):1.

[0118] In summary of all the embodiments, the multi-ratio switched-capacitor voltage conversion circuit in the application can realize different voltage conversion ratios and cover a larger input-output voltage variation range.

[0119] The application also provides a chip including the multi-ratio switched-capacitor voltage conversion circuit as described above.

[0120] The chip can be a switched capacitor voltage converter or a charge pump, used to implement conversion of an input voltage to an output voltage according to a voltage conversion ratio.

[0121] The embodiment of the present application further provides an electronic device, comprising the chip as described above.

[0122] The electronic device can include, but is not limited to, an adapter, a charger, a tablet computer, a smart home device, a vehicle and a wearable device.

[0123] Finally, it should be noted that the above embodiments are merely specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A multi-ratio switched capacitor voltage conversion circuit, characterized in that, The multi-ratio switched capacitor voltage conversion circuit includes: a first unit and a second unit; the first unit includes a first basic unit, a second basic unit, and a third basic unit; the second unit includes N cascaded units; where N is an integer greater than or equal to 1; each cascaded unit includes a first cascaded capacitor, a second cascaded capacitor, and a cascaded switching assembly; the first basic unit includes a first capacitor, a second capacitor, and a first switching assembly; the second basic unit includes a third capacitor, a fourth capacitor, and a second switching assembly; the third basic unit includes a fifth capacitor, a sixth capacitor, and a third switching assembly. The first terminal of the Nth cascaded unit serves as the input terminal of the multi-ratio switched capacitor voltage conversion circuit, used to connect the input voltage. The second and fourth terminals of the Nth cascaded unit are both electrically connected to the first terminal of the (N-1)th cascaded unit. The third terminal of the Nth cascaded unit is electrically connected to the first plate of the first cascaded capacitor in the (N-1)th cascaded unit. The fifth terminal of the Nth cascaded unit is electrically connected to the first plate of the second cascaded capacitor in the (N-1)th cascaded unit. The second and fourth terminals of the first cascaded unit in the N cascaded units are electrically connected to the first terminal of the third basic unit. The third terminal of the first cascaded unit is electrically connected to the first plate of the fifth capacitor, and the fifth terminal of the first cascaded unit is electrically connected to the first plate of the sixth capacitor. The second and fourth terminals of the third basic unit are electrically connected to the first terminal of the second basic unit. The third terminal of the third basic unit is electrically connected to the first plate of the third capacitor, and the fifth terminal of the third basic unit is electrically connected to the first plate of the fourth capacitor. The second terminal of the second basic unit is electrically connected to the first plate of the first capacitor, and the third terminal of the second basic unit is electrically connected to the first plate of the second capacitor. The first terminal of the first basic unit serves as the output terminal of the multi-ratio switched capacitor voltage conversion circuit, used to output the output voltage. The switching assembly includes the first switching assembly, the second switching assembly, the third switching assembly, and each of the cascaded switching assemblies; The switching assembly is used to control the connection relationship between each of the first cascaded capacitors, each of the second cascaded capacitors, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, and the sixth capacitor; The multi-ratio switched capacitor voltage conversion circuit is used to convert the input voltage into the output voltage, wherein the input voltage is (2N+6) times the output voltage.

2. The multi-ratio switched capacitor voltage conversion circuit according to claim 1, characterized in that, The cascaded switch assembly includes: a first cascaded switch, a second cascaded switch, a third cascaded switch, a fourth cascaded switch, a fifth cascaded switch, a sixth cascaded switch, a seventh cascaded switch, and an eighth cascaded switch; The second end of the first cascade switch is electrically connected to the second end of the fifth cascade switch and serves as the first end of the cascade unit. The first end of the first cascade switch is electrically connected to the second end of the third cascade switch and the first plate of the first cascade capacitor. The first end of the third cascade switch serves as the second end of the cascade unit. The second plate of the first cascaded capacitor is electrically connected to the second terminal of the second cascaded switch and the first terminal of the fourth cascaded switch, respectively. The second terminal of the fourth cascaded switch serves as the third terminal of the cascaded unit. The first terminal of the fifth cascade switch is electrically connected to the second terminal of the seventh cascade switch and the first plate of the second cascade capacitor, respectively. The first terminal of the seventh cascade switch serves as the fourth terminal of the cascade unit. The second plate of the second cascade capacitor is electrically connected to the second terminal of the sixth cascade switch and the first terminal of the eighth cascade switch, respectively. The second terminal of the eighth cascade switch serves as the fifth terminal of the cascade unit. The first terminal of the second cascade switch and the first terminal of the sixth cascade switch are both grounded.

3. The multi-ratio switched capacitor voltage conversion circuit according to claim 2, characterized in that, The third switching assembly includes: a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a fifth switching transistor, a sixth switching transistor, a seventh switching transistor, and an eighth switching transistor; The second end of the first switching transistor is electrically connected to the second end of the fifth switching transistor and serves as the first end of the third basic unit. The first end of the first switching transistor is electrically connected to the second end of the third switching transistor and the first plate of the fifth capacitor. The first end of the third switching transistor serves as the second end of the third basic unit. The second plate of the fifth capacitor is electrically connected to the second terminal of the second switch and the first terminal of the fourth switch, respectively, and the second terminal of the fourth switch serves as the third terminal of the third basic unit. The first end of the fifth switch is electrically connected to the second end of the seventh switch and the first plate of the sixth capacitor, respectively, and the first end of the seventh switch serves as the fourth end of the third basic unit. The second plate of the sixth capacitor is electrically connected to the second terminal of the sixth switch and the first terminal of the eighth switch, respectively, and the second terminal of the eighth switch serves as the fifth terminal of the third basic unit. The first terminal of the second switch and the first terminal of the sixth switch are both grounded.

4. The multi-ratio switched capacitor voltage conversion circuit according to claim 3, characterized in that, The second switching assembly includes: 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; The second end of the ninth switch is electrically connected to the second end of the thirteenth switch and serves as the first end of the second basic unit. The first end of the ninth switch is electrically connected to the second end of the tenth switch and the first plate of the third capacitor. The first end of the tenth switch is electrically connected to the second end of the eleventh switch and serves as the second end of the second basic unit. The first end of the eleventh switch is electrically connected to the second plate of the third capacitor and the second end of the twelfth switch, respectively. The first terminal of the thirteenth switch is electrically connected to the second terminal of the fourteenth switch and the first plate of the fourth capacitor, respectively. The first terminal of the fourteenth switch is electrically connected to the second terminal of the fifteenth switch and serves as the third terminal of the second basic unit. The first terminal of the fifteenth switch is electrically connected to the second plate of the fourth capacitor and the second terminal of the sixteenth switch, respectively. The first terminal of the twelfth switch and the first terminal of the sixteenth switch are both grounded.

5. The multi-ratio switched capacitor voltage conversion circuit according to claim 4, characterized in that, The first switching assembly includes: a seventeenth switching transistor, an eighteenth switching transistor, a nineteenth switching transistor, a twentieth switching transistor, a twenty-first switching transistor, and a twenty-second switching transistor; The second end of the seventeenth switch is electrically connected to the first plate of the first capacitor, and the first end of the seventeenth switch is electrically connected to the second end of the eighteenth switch, serving as the first end of the first basic unit. The first terminal of the eighteenth switch is electrically connected to the second plate of the first capacitor and the second terminal of the nineteenth switch, respectively, and the second terminal of the twentieth switch is electrically connected to the first plate of the second capacitor. The first terminal of the twentieth switch is electrically connected to the second terminal of the twentieth eleventh switch and the first terminal of the first basic unit, respectively. The first terminal of the twentieth eleventh switch is electrically connected to the second plate of the second capacitor and the second terminal of the twentieth twelfth switch. The first terminal of the nineteenth switch and the first terminal of the twenty-second switch are both grounded.

6. The multi-ratio switched capacitor voltage conversion circuit according to claim 5, characterized in that, The multi-ratio switched capacitor voltage conversion circuit is used to convert the input voltage into the output voltage in a first mode, wherein the input voltage is (2N+6) times the output voltage; wherein the first mode is the switching component switching between a first state and a second state; In the first state, the first, fourth, sixth, seventh, sixteenth, ninth, fourteenth, eleventh, twentieth, eighteenth, and twenty-second switches, each of the first cascaded switches, each of the fourth cascaded switches, each of the sixth cascaded switches, and each of the seventh cascaded switches are all turned on; the second, third, fifth, eighth, twelfth, tenth, thirteenth, fifteenth, seventeenth, nineteenth, and twenty-first switches, each of the second cascaded switches, each of the third cascaded switches, each of the fifth cascaded switches, and each of the eighth cascaded switches are all turned off. In the second state, the second, third, fifth, eighth, twelfth, tenth, thirteenth, fifteenth, seventeenth, nineteenth, and twenty-first switches, each of the second cascaded switches, each of the third cascaded switches, each of the fifth cascaded switches, and each of the eighth cascaded switches are all turned on; the first, fourth, sixth, seventh, sixteenth, ninth, fourteenth, eleventh, twentieth, eighteenth, and twenty-second switches, each of the first cascaded switches, each of the fourth cascaded switches, each of the sixth cascaded switches, and each of the seventh cascaded switches are all turned off.

7. The multi-ratio switched capacitor voltage conversion circuit according to claim 5, characterized in that, In the case where the second unit includes the N cascaded units and the (N+1)th cascaded unit: If the multi-ratio switched capacitor voltage conversion circuit converts the input voltage into the output voltage when the second unit includes the N cascaded units, the input voltage is X times the output voltage, and the voltage on the first cascaded capacitor and the voltage on the second cascaded capacitor of the Nth cascaded unit are both Y times the output voltage; and when the third switching component is in the third state, the cascaded switching component in the N+1th cascaded unit is in the fourth state; when the third switching component is in the fifth state, the cascaded switching component in the N+1th cascaded unit is in the sixth state; The multi-ratio switched capacitor voltage conversion circuit is used to convert the input voltage into the output voltage in the second mode, wherein the input voltage is 2*X times the output voltage; In the second mode, the first cascade switch in the Nth cascade unit has the same state as the first cascade switch in the N+1th cascade unit, and the fifth cascade switch in the Nth cascade unit has the same state as the fifth cascade switch in the N+1th cascade unit. The multi-ratio switched capacitor voltage conversion circuit is also used to convert the input voltage into the output voltage in the third mode, wherein the input voltage is X+Y times the output voltage; In the third mode, the state of the first cascade switch in the Nth cascade unit is opposite to that of the first cascade switch in the N+1th cascade unit, and the state of the fifth cascade switch in the Nth cascade unit is opposite to that of the fifth cascade switch in the N+1th cascade unit. In the third state, the first, fourth, sixth, and seventh switches are all turned on; the second, third, fifth, and eighth switches are all turned off. In the fourth state, the first, fourth, sixth, and seventh cascade switches in the (N+1)th cascade unit are all turned on; the second, third, fifth, and eighth cascade switches in the (N+1)th cascade unit are all turned off. In the fifth state, the second, third, fifth, and eighth switches are all turned on; the first, fourth, sixth, and seventh switches are all turned off. In the sixth state, the second, third, fifth, and eighth cascade switches in the (N+1)th cascade unit are all turned on; and the first, fourth, sixth, and seventh cascade switches in the (N+1)th cascade unit are all turned off.

8. The multi-ratio switched capacitor voltage conversion circuit according to claim 5, characterized in that, When the multi-ratio switched capacitor voltage conversion circuit includes the first unit, the switching assembly includes the first switching assembly, the second switching assembly, and the third switching assembly; The switching assembly is used to control the connection relationship between the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, and the sixth capacitor; The multi-ratio switched capacitor voltage conversion circuit is used to convert the input voltage into the output voltage, wherein the input voltage is 6 times or 4 times the output voltage.

9. The multi-ratio switched capacitor voltage conversion circuit according to claim 5, characterized in that, The multi-ratio switched capacitor voltage conversion circuit is used to convert the input voltage into an output voltage in a fourth mode, wherein the input voltage is 6 times the output voltage; wherein the fourth mode is the switching component switching between a seventh state and an eighth state; In the seventh state, the first, fourth, sixth, seventh, sixteenth, ninth, fourteenth, eleventh, twentieth, eighteenth, and twenty-second switches are all turned on; the second, third, fifth, eighth, twelfth, tenth, thirteenth, fifteenth, seventeenth, nineteenth, and twenty-first switches are all turned off. In the eighth state, the second, third, fifth, eighth, twelfth, tenth, thirteenth, fifteenth, seventeenth, nineteenth, and twenty-first switches are all turned on; the first, fourth, sixth, seventh, sixteenth, ninth, fourteenth, eleventh, twentieth, eighteenth, and twenty-second switches are all turned off.

10. The multi-ratio switched capacitor voltage conversion circuit according to claim 5, characterized in that, The multi-ratio switched capacitor voltage conversion circuit is used to convert the input voltage into an output voltage in a fifth mode, wherein the input voltage is four times the output voltage; wherein the fifth mode is the switching component switching between a ninth state and a tenth state; In the ninth state, the first, fourth, sixth, seventh, sixteenth, thirteenth, fourteenth, eleventh, eighteenth, twentieth, and twenty-second switches are all turned on; the fifth, eighth, second, third, twelfth, ninth, tenth, fifteenth, seventeenth, nineteenth, and twenty-first switches are all turned off. In the tenth state, the fifth, eighth, second, third, twelfth, ninth, tenth, fifteenth, seventeenth, nineteenth, and twenty-first switches are all turned on; the first, fourth, sixth, seventh, sixteenth, thirteenth, fourteenth, eleventh, eighteenth, twentieth, and twenty-second switches are all turned off.

11. A chip, characterized in that, include: The multi-ratio switched capacitor voltage conversion circuit as described in any one of claims 1-10.

12. An electronic device, characterized in that, include: The chip as described in claim 11.

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