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 plurality of basic units, each basic unit comprises a first capacitor, a second capacitor and a first switch assembly, and the second unit comprises a third capacitor, a fourth capacitor and a second switch assembly. And the plurality of basic units are cascaded and then electrically connected with the second unit. The second switch assembly controls the connection relation between the third capacitor and the fourth capacitor, so that the voltage of the first end of the second unit is two times of the output voltage. The multi-transformation-ratio switched capacitor voltage conversion circuit obtains a recursive relation according to the on-off state of the first switch assembly in each basic unit and converts an input voltage into an output voltage based on the recursive relation and the voltage of the first end of the second unit, the input voltage is 2N + 1 times of the output voltage, and N is the number of the basic units. Therefore, the multi-transformation-ratio switched capacitor voltage conversion circuit can provide various voltage conversion ratios.

Description

Technical Field

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

[0002] A switched capacitor voltage converter, also known as a charge pump, is a highly efficient converter that uses capacitor energy storage to convert DC voltage. It is widely used for fast charging in mobile devices such as mobile phones, tablets, and smartwatches. A switched capacitor voltage converter typically includes multiple switches and capacitors. By controlling the on / off states of the switches, the connections between the capacitors are controlled. Based on the energy storage of the capacitors, the switched capacitor voltage converter can achieve proportional conversion between input voltage and output voltage, as well as between input and output current. For example, the output voltage can be converted to 1 / 4 of the input voltage and the output current to 4 times the input current.

[0003] See also Figure 1 , Figure 1 A dual parallel 4:1 Dickson type switched capacitor conversion circuit is provided for related technologies, such as Figure 1 As shown, the dual-parallel 4:1 Dickson switched capacitor converter circuit includes sixteen switches, namely, a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a seventh switch K7, an eighth switch K8, a ninth switch K9, a tenth switch K10, an eleventh switch K11, a twelfth switch K12, a thirteenth switch K13, a fourteenth switch K14, a fifteenth switch K15, and a sixteenth switch K16. It also includes six flying capacitors, namely, a first flying capacitor C1A, a second flying capacitor C2A, a third flying capacitor C3A, a fourth flying capacitor C1B, a fifth flying capacitor C2B, and a sixth flying capacitor C3B. By controlling the on / off states of the sixteen switches, the circuit utilizes the energy stored in the six capacitors to achieve voltage reduction, converting the output voltage Vout to 1 / 4 of the input voltage Vin and the output current to four times the input current.

[0004] With the rapid development of fast charging services for mobile devices such as mobile phones, higher requirements are placed on the voltage conversion ratio of switched capacitor voltage conversion circuits. A switched capacitor voltage conversion circuit that achieves different voltage conversion ratios can adapt to more fast charging situations and save circuit costs. However, the architecture of the 4:1 switched capacitor conversion circuit in the prior art can often only achieve a voltage conversion ratio of 4:1 and 2:1 between the input voltage and the output voltage, which limits the application of the switched capacitor voltage conversion circuit. Therefore, how the switched capacitor voltage conversion circuit can achieve multiple voltage conversion ratios is an important issue that needs to be solved. Summary of the Invention

[0005] The present application provides a multi-ratio switched capacitor voltage conversion circuit, chip, and electronic device to provide multiple voltage conversion ratios.

[0006] In a first aspect, the present 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 plurality of basic units, the plurality of basic units comprising: a first basic unit, a second basic unit, ..., an N-1th basic unit, an Nth basic unit, where N is an integer greater than or equal to 1; each of the basic units comprises a first capacitor, a second capacitor, and a first switch component, the second unit comprises a third capacitor, a fourth capacitor, and a second switch component;

[0007] The first end of the Nth basic unit serves as an input end of the multi-ratio switched capacitor voltage conversion circuit, and is used to receive an input voltage. The second end of the Nth basic unit and the fourth end of the Nth basic unit are both electrically connected to the first end of the N-1th basic unit. The third end of the Nth basic unit is electrically connected to the first plate of the first capacitor in the N-1th basic unit. The fifth end of the Nth basic unit is electrically connected to the first plate of the second capacitor in the N-1th basic unit.

[0008] The second end of the first basic unit and the fourth end of the first basic unit are both electrically connected to the first end of the second unit, the third end of the first basic unit is electrically connected to the first plate of the third capacitor, the fifth end of the first basic unit is electrically connected to the first plate of the fourth capacitor, and the second end of the second unit serves as the output end of the multi-ratio switched capacitor voltage conversion circuit, for outputting an output voltage;

[0009] The second switch component is used to control the connection relationship between the third capacitor and the fourth capacitor so that the voltage at the first end of the second unit is twice the output voltage;

[0010] The multi-ratio switched capacitor voltage conversion circuit is used to obtain a recursive relationship according to the switching state of the first switch component in each of the basic units, and convert the input voltage into an output voltage based on the recursive relationship and the voltage of the first end of the second unit, wherein the input voltage is 2 times the output voltage. N+1 times, N is the number of the basic units.

[0011] In a possible design, the first switch assembly includes: a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a thirteenth switch tube, a fourteenth switch tube, a fifteenth switch tube, and a sixteenth switch tube;

[0012] The drain of the first switching transistor is electrically connected to the drain of the thirteenth switching transistor and serves as the first end of the basic unit. The source of the first switching transistor is electrically connected to the drain of the third switching transistor and the first plate of the first capacitor, respectively. The source of the third switching transistor serves as the second end of the basic unit.

[0013] The second electrode plate of the first capacitor is electrically connected to the drain of the second switching transistor and the source of the fourth switching transistor respectively, the source of the second switching transistor is grounded, and the drain of the fourth switching transistor serves as the third terminal of the basic unit;

[0014] The source of the thirteenth switch is electrically connected to the drain of the fifteenth switch and the first plate of the second capacitor, respectively, and the source of the fifteenth switch serves as the fourth terminal of the basic unit;

[0015] The second electrode plate of the second capacitor is electrically connected to the drain of the fourteenth switch tube and the source of the sixteenth switch tube respectively. The source of the fourteenth switch tube is grounded, and the drain of the sixteenth switch tube serves as the fifth end of the basic unit.

[0016] In one possible design, the second switch component includes: a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube, and a twelfth switch tube; and the second unit further includes: a fifth capacitor and a sixth capacitor;

[0017] The drain of the fifth switching transistor is electrically connected to the drain of the ninth switching transistor and the first plate of the fifth capacitor, and serves as the first end of the second unit. The source of the fifth switching transistor is electrically connected to the first plate of the third capacitor and the drain of the sixth switching transistor.

[0018] The source of the sixth switching tube is electrically connected to the drain of the seventh switching tube, the first plate of the sixth capacitor, the source of the tenth switching tube, and the drain of the eleventh switching tube respectively;

[0019] The second electrode plate of the third capacitor is electrically connected to the source of the seventh switching transistor and the drain of the eighth switching transistor respectively, and the source of the eighth switching transistor is grounded;

[0020] The source of the ninth switching tube is electrically connected to the drain of the tenth switching tube and the first plate of the fourth capacitor respectively;

[0021] The second electrode plate of the fourth capacitor is electrically connected to the source of the eleventh switching tube and the drain of the twelfth switching tube respectively, and the source of the twelfth switching tube is grounded;

[0022] The second plate of the fifth capacitor and the second plate of the sixth capacitor are both grounded.

[0023] In one possible design, the second switch component switches between a first state and a second state to control a connection relationship between the third capacitor and the fourth capacitor so that a voltage at the first end of the second unit is twice the output voltage;

[0024] Wherein, in the first state, the sixth switch tube, the eighth switch tube, the ninth switch tube, and the eleventh switch tube are all turned on, and the fifth switch tube, the seventh switch tube, the tenth switch tube, and the twelfth switch tube are all turned off;

[0025] In the second state, the fifth switch tube, the seventh switch tube, the tenth switch tube, and the twelfth switch tube are all turned on, and the sixth switch tube, the eighth switch tube, the ninth switch tube, and the eleventh switch tube are all turned off.

[0026] In one possible design, the recursive relationship includes a first recursive relationship;

[0027] The multi-ratio switched capacitor voltage conversion circuit obtains the first recursive relationship in the first working mode, and converts the input voltage into an output voltage based on the first recursive relationship and the voltage of the first end of the second unit, wherein the input voltage is 2 times the output voltage. N+1 times;

[0028] In the first working mode, when the first switch component of the Nth basic unit is in the first combination state, the first switch component of the N-1th basic unit is in the first combination state; when the first switch component of the Nth basic unit is in the second combination state, the first switch component of the N-1th basic unit is in the second combination state;

[0029] Wherein, in the first combination state, the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned on, and the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned off;

[0030] In the second combination state, the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned on, and the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned off.

[0031] In one possible design, the recursive relationship includes a second recursive relationship;

[0032] The multi-ratio switched capacitor voltage conversion circuit obtains the second recursive relationship in the second working mode, and converts the input voltage into an output voltage based on the second recursive relationship and the voltage of the first end of the second unit, wherein the input voltage is 2 times the output voltage. N+1 times;

[0033] In the second working mode, when the first switch component of the Nth basic unit is in the first combination state, the first switch component of the N-1th basic unit is in the second combination state; when the first switch component of the Nth basic unit is in the second combination state, the first switch component of the N-1th basic unit is in the first combination state;

[0034] Wherein, in the first combination state, the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned on, and the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned off;

[0035] In the second combination state, the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned on, and the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned off.

[0036] In one possible design, the recursive relationship includes a third recursive relationship;

[0037] The multi-ratio switched capacitor voltage conversion circuit obtains the third recursive relationship in the third working mode, and converts the input voltage into an output voltage based on the third recursive relationship and the voltage of the first end of the second unit, wherein the input voltage is 2 times the output voltage. N+1 times;

[0038] In the third operating mode, when the first switch component of the Nth basic unit is in the third combination state, the first switch component of the N-1th basic unit is in the first combination state or the third combination state; when the first switch component of the Nth basic unit is in the fourth combination state, the second switch component of the N-1th basic unit is in the second combination state or the fourth combination state;

[0039] Wherein, in the first combination state, the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned on, and the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned off;

[0040] In the second combination state, the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned on, and the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned off;

[0041] In the third combination state, the first switch tube, the fourth switch tube, the fifteenth switch tube, and the sixteenth switch tube are all turned on, and the third switch tube, the second switch tube, the thirteenth switch tube, and the fourteenth switch tube are all turned off;

[0042] In the fourth combination state, the third switch tube, the fourth switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned on, and the first switch tube, the second switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned off.

[0043] In one possible design, the recursive relationship includes a fourth recursive relationship;

[0044] The multi-ratio switched capacitor voltage conversion circuit obtains the fourth recursive relationship in the fourth working mode, and converts the input voltage into an output voltage based on the fourth recursive relationship and the voltage of the first end of the second unit, wherein the input voltage is 2 times the output voltage. N+1 times;

[0045] In the fourth working mode, the first switch component of the Nth basic unit is in the fifth combination state;

[0046] In the fifth combination state, the first switch tube, the third switch tube, the thirteenth switch tube, and the fifteenth switch tube are all turned on, and the second switch tube, the fourth switch tube, the fourteenth switch tube, and the sixteenth switch tube are all turned off.

[0047] In a second aspect, the present application provides a chip comprising: the multi-ratio switched capacitor voltage conversion circuit as described in the first aspect.

[0048] In a third aspect, the present application provides an electronic device, comprising: the chip as described in the second aspect.

[0049] Beneficial effects of the embodiments of the present application:

[0050] Based on the electrical connection relationship between the plurality of basic units and the second unit, if the voltage conversion ratio between the voltage at the first end of the second unit and the output voltage is taken as the initial value, that is, VO1 = 2VOUT, based on the recursive relationship between the Nth basic unit and the N-1th basic unit, that is, the voltage VO at the first end of the Nth basic unit N+1 The voltage VO of the first terminal of the N-1th basic unit NThe recursive relationship between them can be deduced by analogy to obtain the voltage conversion ratio between the input voltage VIN and the output voltage VOUT, thereby enabling the multi-ratio switched capacitor voltage conversion circuit to obtain multiple voltage conversion ratios in different states of the first switch component in each basic unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0052] Figure 1 A schematic diagram of a dual-parallel 4:1 Dickson switched capacitor conversion circuit structure provided for related technology;

[0053] Figure 2 A schematic diagram of the structure of a multi-ratio switched capacitor voltage conversion circuit provided in an embodiment of the present application;

[0054] Figure 3 A schematic structural diagram of a basic unit provided in an embodiment of the present application;

[0055] Figure 4 A multi-ratio switched capacitor voltage conversion circuit including a basic unit is provided in an embodiment of the present application;

[0056] FIG5( a ) is a schematic diagram of a first stage of a multi-ratio switched capacitor voltage conversion circuit in a first operating mode provided by an embodiment of the present application;

[0057] FIG5( b ) is a schematic diagram of the second stage of a multi-ratio switched capacitor voltage conversion circuit in a first operating mode provided by an embodiment of the present application;

[0058] FIG6( a ) is a schematic diagram of the first stage of a multi-ratio switched capacitor voltage conversion circuit in a second operating mode provided by an embodiment of the present application;

[0059] FIG6( b ) is a schematic diagram of the second stage of a multi-ratio switched capacitor voltage conversion circuit in a second operating mode provided by an embodiment of the present application;

[0060] FIG7( a ) is a schematic diagram of the first stage of a multi-ratio switched capacitor voltage conversion circuit in a third operating mode provided by an embodiment of the present application;

[0061] FIG7( b ) is a schematic diagram of the second stage of a multi-ratio switched capacitor voltage conversion circuit in a third operating mode provided by an embodiment of the present application;

[0062] FIG8( a ) is a schematic diagram of the first stage of a multi-ratio switched capacitor voltage conversion circuit in a fourth operating mode provided by an embodiment of the present application;

[0063] FIG8( b ) is a schematic diagram of the second stage of a multi-ratio switched capacitor voltage conversion circuit in a fourth operating mode provided by an embodiment of the present application. DETAILED DESCRIPTION

[0064] In this application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a alone, b alone, or c alone can represent: a alone, b alone, c alone, a and b in combination, a and c in combination, b and c in combination, or a, b, and c in combination, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0065] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present application.

[0066] The terms "connected" and "connect" should be interpreted broadly. For example, "connected" or "connected" in a circuit structure can refer not only to a physical connection, but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as the circuit is interconnected. It can also refer to internal connectivity between two components. Signal connection can refer not only to signal connection through circuits but also to signal connection through media, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application on a case-by-case basis.

[0067] In order to enable a switched capacitor voltage conversion circuit to achieve multiple voltage conversion ratios and thus adapt to more fast charging situations, the present application provides a multi-ratio switched capacitor voltage conversion circuit, which includes a first unit and a second unit, wherein the first unit includes multiple basic units. Since the first unit is composed of multiple basic units stacked together, and the second end of the Nth basic unit and the fourth end of the Nth basic unit are both electrically connected to the first end of the N-1th basic unit, by controlling the state of the first switch component of each basic unit, a recursive relationship exists between the Nth basic unit and the N-1th basic unit. In addition, the first end of the second unit is electrically connected to the second end of the first basic unit and the fourth end of the first basic unit, and by controlling the state of the second switch component in the second unit, the voltage at the first end of the second unit is twice the output voltage. The voltage conversion ratio between the voltage at the first end of the second unit and the output voltage can be used as an initial value. Based on the recursive relationship between the Nth basic unit and the N-1th basic unit, the voltage conversion ratio between the input voltage and the output voltage can be obtained by analogy. Thus, the multi-ratio switched capacitor voltage conversion circuit can obtain multiple voltage conversion ratios under different states of the first switch component in each basic unit.

[0068] See also Figure 2 , Figure 2 A multi-ratio switched capacitor voltage conversion circuit 1000 provided in an embodiment of the present application is as follows: Figure 2 As shown, a multi-ratio switched capacitor voltage conversion circuit 1000 may include: a first unit 100 and a second unit 200. The first unit 100 includes multiple basic units, and the multiple basic units may include: a first basic unit, a second basic unit, ..., an N-1th basic unit, and an Nth basic unit, where N is an integer greater than or equal to 1. Each basic unit includes a first capacitor, a second capacitor, and a first switch component. The second unit 200 includes a third capacitor CF3, a fourth capacitor CF4, and a second switch component 201.

[0069] The first terminal T of the Nth basic unit N1 The input terminal IN of the multi-ratio switched capacitor voltage conversion circuit 1000 is used to receive the input voltage VIN. The second terminal T N2 , the fourth terminal T of the Nth basic unit N4 Both are connected to the first end T of the N-1 basic unit N-1 Electrical connection, the third terminal T of the Nth basic unit N3 The fifth terminal T of the Nth basic unit is electrically connected to the first plate of the first capacitor in the N-1th basic unit. N5 The first electrode plate is electrically connected to the second capacitor in the (N-1)th basic unit.

[0070] The second end T of the first basic unit12 , the fourth end T of the first basic unit 14 are electrically connected to the first terminal T21 of the second unit 200, and the third terminal T 13 The fifth terminal T of the first basic unit is electrically connected to the first plate of the third capacitor CF3. 15 The second end T22 of the second unit 200 is electrically connected to the first plate of the fourth capacitor CF4 and serves as the output end OUT of the multi-ratio switched capacitor voltage conversion circuit for outputting the output voltage VOUT.

[0071] The second switch component 201 is used to control the connection relationship between the third capacitor CF3 and the fourth capacitor CF4 so that the voltage at the first terminal T21 of the second unit 200 is twice the output voltage VOUT.

[0072] The multi-ratio switched capacitor voltage conversion circuit 1000 is used to obtain a recursive relationship according to the switching state of the first switch component in each basic unit, and based on the recursive relationship and the voltage VO1 of the first terminal T21 of the second unit 200, convert the input voltage VIN into the output voltage VOUT. The input voltage VIN is 2 times the output voltage VOUT. N+1 times, where N is the number of basic units.

[0073] Continue to see Figure 2 In this application, the first end T of the Nth basic unit N1 The input terminal IN of the multi-ratio switched capacitor voltage converter circuit 1000 receives the input voltage VIN, and the second terminal T22 of the second unit 200 serves as the output terminal OUT of the multi-ratio switched capacitor voltage converter circuit 1000, outputting the output voltage VOUT. Based on the electrical connection structure between the first unit 100 and the second unit 200, the multi-ratio switched capacitor voltage converter circuit 1000 converts the input voltage VIN into the output voltage VOUT.

[0074] The first unit 100 includes a plurality of basic units. In order to more clearly explain the electrical connection relationship between the plurality of basic units, the structure of one basic unit will be described. Figure 3 , Figure 3 A schematic diagram of the structure of a basic unit provided in an embodiment of the present application is shown in FIG. Figure 3As shown, each basic unit includes a first capacitor CFA, a second capacitor CFB and a first switch component 101. Each basic unit includes five ports, namely a first terminal T1, a second terminal T2, a third terminal T3, a fourth terminal T4 and a fifth terminal T5. It is understood that in order to more clearly describe the electrical connection relationship between the basic units, the multiple basic units are distinguished and the five ports of each basic unit and the reference numerals of the first capacitor CFA and the second capacitor CFB are added with corresponding serial numbers. For example, the first terminal of the Nth basic unit is represented as T N1 , the second end of the Nth basic unit is represented by T N2 , the third terminal of the Nth basic unit is represented by T N3 , the fourth end of the Nth basic unit is represented by T N4 The first capacitor in the Nth basic unit is denoted as CFAN, and the second capacitor is denoted as CFBN.

[0075] The specific electrical connection method of the multiple basic units is as follows: the first terminal T of the Nth basic unit N1 As the input terminal IN of the multi-ratio switched capacitor voltage conversion circuit 1000, the second terminal T N2 , the fourth terminal T of the Nth basic unit N4 Both are connected to the first end T of the N-1 basic unit N-1 Electrical connection, the third terminal T of the Nth basic unit N3 The fifth terminal T of the Nth basic unit is electrically connected to the first plate of the first capacitor in the N-1th basic unit. N5 The first terminal T of the second capacitor in the N-1th basic unit is electrically connected to the first plate of the second capacitor in the N-1th basic unit. N-1 Electrical connection, if the first terminal T of the Nth basic unit N1 The voltage is recorded as VO N+1 , the first end T of the N-1 basic unit (N-1)1 The voltage is recorded as VO N , then the voltage VO of the first terminal of the Nth basic unit N+1 The voltage VO of the first terminal of the N-1th basic unit N There is a recursive relationship between them, and the recursive relationship is related to the switching state of the first switch component in the Nth basic unit and the switching state of the first switch component in the (N-1)th basic unit.

[0076] The first unit is composed of multiple stacked basic units, where the multiple basic units include: a first basic unit, a second basic unit, ..., the (N-1)th basic unit, and the (N)th basic unit. The first unit electrically connects the (N)th basic unit to the (N-1)th basic unit, and so on, electrically connects the second basic unit to the first basic unit. Finally, the first basic unit is electrically connected to the second unit.

[0077] Specifically, the second unit includes four ports, namely a first terminal T21, a second terminal T22, a third terminal T23, and a fourth terminal T24, wherein the third terminal T23 of the second unit is the first plate of the third capacitor, and the fourth terminal T24 of the second unit is the first plate of the fourth capacitor. 12 , the fourth end T of the first basic unit 14 are electrically connected to the first terminal T21 of the second unit 200, and the third terminal T 13 The first terminal T23 of the first basic unit is electrically connected to the first plate of the third capacitor CF3 (ie, the third terminal T23 of the second unit). 15 The second terminal T22 of the second unit 200 is electrically connected to the first plate of the fourth capacitor CF4 (the fourth terminal T24 of the second unit), and serves as the output terminal OUT of the multi-ratio switched capacitor voltage conversion circuit, for outputting the output voltage VOUT. If the voltage at the first terminal T21 of the second unit is denoted as VO1, then depending on the switching state of the second switch component 201, the voltage VO1 at the first terminal T21 of the second unit is twice the output voltage VOUT, i.e., VO1 = 2VOUT.

[0078] Based on the electrical connection relationship between the plurality of basic units and the second unit, if the voltage conversion ratio between the voltage at the first end of the second unit and the output voltage is taken as the initial value, that is, VO1 = 2VOUT, based on the recursive relationship between the Nth basic unit and the N-1th basic unit, that is, the voltage VO at the first end of the Nth basic unit N+1 The voltage VO of the first terminal of the N-1th basic unit N The recursive relationship between them can be deduced by analogy to obtain the voltage conversion ratio between the input voltage VIN and the output voltage VOUT, thereby enabling the multi-ratio switched capacitor voltage conversion circuit to obtain multiple voltage conversion ratios in different states of the first switch component in each basic unit.

[0079] In one possible embodiment, please see Figure 3 The first switch component 101 may include: a first switch tube Q1A, a second switch tube Q2A, a third switch tube Q3A, a fourth switch tube Q4A, a thirteenth switch tube Q1B, a fourteenth switch tube Q2B, a fifteenth switch tube Q3B and a sixteenth switch tube Q4B.

[0080] The drain of the first switching transistor Q1A is electrically connected to the drain of the thirteenth switching transistor Q1B and serves as the first end T1 of the basic unit. The source of the first switching transistor Q1A is electrically connected to the drain of the third switching transistor Q3A and the first plate of the first capacitor CFA, respectively. The source of the third switching transistor Q3A serves as the second end T2 of the basic unit.

[0081] The second plate of the first capacitor CFA is electrically connected to the drain of the second switch tube Q2A and the source of the fourth switch tube Q4A respectively. The source of the second switch tube Q2A is grounded, and the drain of the fourth switch tube Q4A serves as the third terminal T3 of the basic unit.

[0082] The source of the thirteenth switch tube Q1B is electrically connected to the drain of the fifteenth switch tube Q3B and the first plate of the second capacitor CFB respectively. The source of the fifteenth switch tube Q3B serves as the fourth terminal T4 of the basic unit.

[0083] The second plate of the second capacitor CFB is electrically connected to the drain of the fourteenth switch Q2B and the source of the sixteenth switch Q4B respectively. The source of the fourteenth switch Q2B is grounded, and the drain of the sixteenth switch Q4B serves as the fifth terminal T5 of the basic unit.

[0084] Among them, the type of the first switching tube Q1A, the second switching tube Q2A, the third switching tube Q3A, the fourth switching tube Q4A, the thirteenth switching tube Q1B, the fourteenth switching tube Q2B, the fifteenth switching tube Q3B and the sixteenth switching tube Q4B can be any one of a gallium nitride transistor, a bipolar junction transistor, an insulated gate bipolar transistor and a metal-oxide-semiconductor field-effect transistor, and this application does not make any specific limitation on this.

[0085] In a possible embodiment, the first switch Q1A, the second switch Q2A, the third switch Q3A, the fourth switch Q4A, the thirteenth switch Q1B, the fourteenth switch Q2B, the fifteenth switch Q3B, and the sixteenth switch Q4B may be N-type transistors.

[0086] In addition, the gates of the first switching tube Q1A, the second switching tube Q2A, the third switching tube Q3A, the fourth switching tube Q4A, the thirteenth switching tube Q1B, the fourteenth switching tube Q2B, the fifteenth switching tube Q3B, and the sixteenth switching tube Q4B are all electrically connected to the logic control circuit, and the logic control circuit controls the on / off state of the transistors.

[0087] Among them, the first plate of the first capacitor CFA can be the positive plate of the first capacitor CFA, and the second plate of the first capacitor CFA can be the negative plate of the first capacitor CFA; the first plate of the second capacitor CFB can be the positive plate of the second capacitor CFB, and the second plate of the second capacitor CFB can be the negative plate of the second capacitor CFB.

[0088] To facilitate the description of the switching states of each transistor, the first switch component 101 is usually divided into phase A and phase B, where phase A includes: a first switch tube Q1A, a second switch tube Q2A, a third switch tube Q3A, and a fourth switch tube Q4A; phase B includes: a thirteenth switch tube Q1B, a fourteenth switch tube Q2B, a fifteenth switch tube Q3B, and a sixteenth switch tube Q4B.

[0089] In one possible embodiment, please see Figure 2 The second switch component 201 may include: a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a ninth switch tube Q9, a tenth switch tube Q10, an eleventh switch tube Q11 and a twelfth switch tube Q12, and the second unit also includes: a fifth capacitor Cp and a sixth capacitor Cout.

[0090] The drain of the fifth switch tube Q5 is electrically connected to the drain of the ninth switch tube Q9 and the first plate of the fifth capacitor Cp, and serves as the first end T21 of the second unit 200. The source of the fifth switch tube Q5 is electrically connected to the first plate of the third capacitor CF3 and the drain of the sixth switch tube Q6.

[0091] The source of the sixth switch tube Q6 is electrically connected to the drain of the seventh switch tube Q7 , the first plate of the sixth capacitor Cout, the source of the tenth switch tube Q10 , and the drain of the eleventh switch tube Q11 , respectively.

[0092] The second electrode plate of the third capacitor CF3 is electrically connected to the source of the seventh switch tube Q7 and the drain of the eighth switch tube Q8 respectively, and the source of the eighth switch tube Q8 is grounded.

[0093] The source of the ninth switch tube Q9 is electrically connected to the drain of the tenth switch tube Q10 and the first plate of the fourth capacitor CF4 respectively.

[0094] The second electrode plate of the fourth capacitor CF4 is electrically connected to the source of the eleventh switch tube Q11 and the drain of the twelfth switch tube Q12 respectively. The source of the twelfth switch tube Q12 is grounded.

[0095] The second plate of the fifth capacitor Cp and the second plate of the sixth capacitor Cout are both grounded.

[0096] Among them, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11 and the twelfth switching tube Q12 can be any one of a gallium nitride transistor, a bipolar junction transistor, an insulated gate bipolar transistor and a metal-oxide-semiconductor field-effect transistor, and this application does not make any specific limitation on this.

[0097] In a possible embodiment, the fifth switch tube Q5 , the sixth switch tube Q6 , the seventh switch tube Q7 , the eighth switch tube Q8 , the ninth switch tube Q9 , the tenth switch tube Q10 , the eleventh switch tube Q11 , and the twelfth switch tube Q12 may be N-type transistors.

[0098] In addition, the gates of the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11, and the twelfth switching tube Q12 are all electrically connected to the logic control circuit, and the logic control circuit controls the on / off state of the transistors.

[0099] Among them, the first plate of the third capacitor CF3 can be the positive plate of the first capacitor CF3, and the second plate of the third capacitor CF3 can be the negative plate of the third capacitor CF3; the first plate of the fourth capacitor CF4 can be the positive plate of the fourth capacitor CF4, and the second plate of the fourth capacitor CF4 can be the negative plate of the second capacitor CF4; the first plate of the fifth capacitor Cp can be the positive plate of the fifth capacitor Cp, and the second plate of the fifth capacitor Cp can be the negative plate of the fifth capacitor Cp; the first plate of the sixth capacitor Cout can be the positive plate of the sixth capacitor Cout, and the second plate of the sixth capacitor Cout can be the negative plate of the sixth capacitor Cout.

[0100] In one possible embodiment, see Figure 2 The second switch component 201 switches between the first state and the second state to control the connection relationship between the third capacitor CF3 and the fourth capacitor CF4 so that the voltage of the first terminal T21 of the second unit 200 is twice the output voltage VOUT.

[0101] In the first state, the sixth switch tube Q6, the eighth switch tube Q8, the ninth switch tube Q9 and the eleventh switch tube Q11 are all turned on, and the fifth switch tube Q5, the seventh switch tube Q7, the tenth switch tube Q10 and the twelfth switch tube Q12 are all turned off.

[0102] In the second state, the fifth switch Q5, the seventh switch Q7, the tenth switch Q10 and the twelfth switch Q12 are all turned on, and the sixth switch Q6, the eighth switch Q8, the ninth switch Q9 and the eleventh switch Q11 are all turned off.

[0103] In one cycle, the second switch component 201 switches between the first state and the second state, and the first state and the second state each occupy half a cycle.

[0104] See Figure 2In the first state, the sixth switch transistor Q6, the eighth switch transistor Q8, the ninth switch transistor Q9, and the eleventh switch transistor Q11 are all turned on, while the fifth switch transistor Q5, the seventh switch transistor Q7, the tenth switch transistor Q10, and the twelfth switch transistor Q12 are all turned off. In this state, the first terminal T21 of the second unit 200 is electrically connected to the first plate of the fourth capacitor CF4, the second plate of the fourth capacitor CF4 is electrically connected to the first plate of the third capacitor CF3 and the second terminal T22 of the second unit 200, respectively, and the second plate of the third capacitor CF3 is grounded. That is, the voltage VO1 at the first terminal T21 of the second unit 200 is connected to ground after passing through the third capacitor CF3 and the fourth capacitor CF4 connected in series, and the second terminal T22 of the second unit 200 (i.e., the output terminal of the multi-ratio switched capacitor voltage conversion circuit) is located between the third capacitor CF3 and the fourth capacitor CF4.

[0105] See Figure 2 In the second state, the fifth switch transistor Q5, the seventh switch transistor Q7, the tenth switch transistor Q10, and the twelfth switch transistor Q12 are all turned on, while the sixth switch transistor Q6, the eighth switch transistor Q8, the ninth switch transistor Q9, and the eleventh switch transistor Q11 are all turned off. In this state, the first terminal T21 of the second unit 200 is electrically connected to the first plate of the third capacitor CF3, the second plate of the third capacitor CF3 is electrically connected to the first plate of the fourth capacitor CF4 and the second terminal T22 of the second unit 200, respectively, and the second plate of the fourth capacitor CF4 is grounded. That is, the voltage VO1 at the first terminal T21 of the second unit 200 is connected to ground after passing through the third capacitor CF3 and the fourth capacitor CF4 connected in series, and the second terminal T22 of the second unit 200 (i.e., the output terminal of the multi-ratio switched capacitor voltage conversion circuit) is located between the third capacitor CF3 and the fourth capacitor CF4.

[0106] The second switch component 201 switches between a first state and a second state, and controls the on or off state of each switch tube, thereby controlling the connection relationship between the third capacitor CF3 and the fourth capacitor CF4. Based on the energy storage function of the third capacitor CF3 and the fourth capacitor CF4, the voltage VO1 of the first terminal T21 of the second unit 200 can be twice the voltage of the second terminal T22 of the second unit 200, that is, VO1=2VOUT.

[0107] In one possible embodiment, see Figure 2 and Figure 3 , the recursive relationship includes a first recursive relationship; the multi-ratio switched capacitor voltage conversion circuit obtains the first recursive relationship VO in the first working mode N+1 =2VO N , based on the first recursive relationship and the voltage VO1 of the first terminal of the second unit, the input voltage is converted into the output voltage, the input voltage is the output voltage 2 N+1 times.

[0108] In the first working mode, when the first switch component of the Nth basic unit is in the first combination state, the first switch component of the N-1th basic unit is in the first combination state; when the first switch component of the Nth basic unit is in the second combination state, the first switch component of the N-1th basic unit is in the second combination state.

[0109] In the first combination state, the first switch tube Q1A, the fourth switch tube Q4A, the fourteenth switch tube Q2B, and the fifteenth switch tube Q3B are all turned on, and the second switch tube Q2A, the third switch tube Q3A, the thirteenth switch tube Q1B, and the sixteenth switch tube Q4B are all turned off.

[0110] In the second combination state, the second switch tube Q2A, the third switch tube Q3A, the thirteenth switch tube Q1B, and the sixteenth switch tube Q4B are all turned on, and the first switch tube Q1A, the fourth switch tube Q4A, the fourteenth switch tube Q2B, and the fifteenth switch tube Q3B are all turned off.

[0111] In the embodiment of the present application, the multi-ratio switched capacitor voltage conversion circuit operates in the first working mode according to the first recursive relationship VO N+1 =2VO N Based on the relationship between the voltage VO1 at the first end of the second unit and the output voltage VOUT, that is, VO1 = 2VOUT, and so on, the voltage VO at the first end of the Nth basic unit can be obtained. N+1 The voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be obtained, that is, the voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be obtained, so that the input voltage is 2 times the output voltage N+1 times.

[0112] See also Figure 2 In this application, N basic units are cascaded. The voltage transformation ratio of the Nth basic unit is related to the state of the first switch components in the Nth basic unit and the N-1th basic unit. In a cycle, the duty cycle of the first and second combination states is 50%, and the first and second combination states each last for half a cycle. In the first operating mode, each basic unit switches between the first and second combination states.

[0113] In addition, in the first working mode, it is necessary to ensure that the states of the first switch components in the Nth basic unit and the N-1th basic unit are the same, that is, when the first switch component of the Nth basic unit is in the first combination state, the first switch component of the N-1th basic unit is in the first combination state; when the first switch component of the Nth basic unit is in the second combination state, the first switch component of the N-1th basic unit is in the second combination state.

[0114] In order to clearly explain the process of obtaining the first recursive relationship in the first working mode, N is set to 2 in this application, that is, the multi-ratio switched capacitor voltage conversion circuit includes two basic units and a second unit, namely, a first basic unit, a second basic unit and a second unit.

[0115] See also Figure 2 In the first working mode, when the first switch component of the second basic unit is in the first combination state, the first switch component of the first basic unit is in the first combination state, that is, the first switch tube Q1A2, the fourth switch tube Q4A2, the fourteenth switch tube Q2B2, and the fifteenth switch tube Q3B2 in the second basic unit are all turned on, and the second switch tube Q2A2, the third switch tube Q3A2, the thirteenth switch tube Q1B2, and the sixteenth switch tube Q4B2 are all turned off; the first switch tube Q1A1, the fourth switch tube Q4A1, the fourteenth switch tube Q2B1, and the fifteenth switch tube Q3B1 in the first basic unit are all turned on, and the second switch tube Q2A1, the third switch tube Q3A1, the thirteenth switch tube Q1B1, and the sixteenth switch tube Q4B1 are all turned off.

[0116] In this state, from the perspective of the A phase of the second basic unit and the first basic unit, the voltage VO3 of the first end of the second basic unit is VCFA2+VO2, where VCFA2 is the voltage on the first capacitor CFA2 in the second basic unit. From the perspective of the B phase of the second basic unit and the first basic unit, VO2 is VCFB2, where VCFB2 is the voltage on the second capacitor CFB2 in the second basic unit. Since the voltages of the first capacitor CFA2 and the second capacitor CFB2 are equal during the switching process, that is, VCFA2=VCFB2, VO3=2VO2. In this way, consistent with the first recursive relationship VO N+1 =2VO N consistent.

[0117] Since the second combination state is opposite to the first combination state, when the first switch component of the second basic unit is in the second combination state, the first recursive relationship VO can still be obtained. N+1 =2VO N . I will not go into details here.

[0118] In one possible embodiment, see Figure 2 and Figure 3 , the recursive relationship includes a second recursive relationship; the multi-ratio switched capacitor voltage conversion circuit obtains the second recursive relationship VO in the second working mode N+1 =VO N +VO N-1 Based on the second recursive relationship and the voltage VO1 of the first terminal of the second unit, the input voltage is converted into the output voltage. The input voltage is 2 times the output voltage.N+1 times.

[0119] In the second working mode, when the first switch component of the Nth basic unit is in the first combination state, the first switch component of the N-1th basic unit is in the second combination state; when the first switch component of the Nth basic unit is in the second combination state, the first switch component of the N-1th basic unit is in the first combination state.

[0120] In the first combination state, the first switch tube Q1A, the fourth switch tube Q4A, the fourteenth switch tube Q2B, and the fifteenth switch tube Q3B are all turned on, and the second switch tube Q2A, the third switch tube Q3A, the thirteenth switch tube Q1B, and the sixteenth switch tube Q4B are all turned off.

[0121] In the second combination state, the second switch tube Q2A, the third switch tube Q3A, the thirteenth switch tube Q1B, and the sixteenth switch tube Q4B are all turned on, and the first switch tube Q1A, the fourth switch tube Q4A, the fourteenth switch tube Q2B, and the fifteenth switch tube Q3B are all turned off.

[0122] In the embodiment of the present application, the multi-ratio switched capacitor voltage conversion circuit operates in the second working mode according to the second recursive relationship VO N+1 =VO N +VO N-1 Based on the relationship between the voltage VO1 at the first end of the second unit and the output voltage VOUT, that is, VO1 = 2VOUT, and so on, the voltage VO at the first end of the Nth basic unit can be obtained. N+1 The voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be obtained, that is, the voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be obtained, so that the input voltage is 2 times the output voltage N+1 times.

[0123] The difference between the second working mode and the first working mode is that in the second working mode, it is necessary to ensure that the states of the first switch components in the Nth basic unit and the N-1th basic unit are opposite, that is, when the first switch component of the Nth basic unit is in the first combination state, the first switch component of the N-1th basic unit is in the second combination state; when the second switch component of the Nth basic unit is in the second combination state, the first switch component of the N-1th basic unit is in the first combination state.

[0124] In this embodiment, N is still set to 2 to explain the process of obtaining the second recursive relationship in the second working mode, that is, the multi-ratio switched capacitor voltage conversion circuit includes two basic units and a second unit, namely, a first basic unit, a second basic unit and a second unit.

[0125] See also Figure 2In the second operating mode, when the first switch component of the second basic unit is in the first combination state, the first switch component of the first basic unit is in the second combination state, that is, the first switch tube Q1A2, the fourth switch tube Q4A2, the fourteenth switch tube Q2B2, and the fifteenth switch tube Q3B2 in the second basic unit are all turned on, and the second switch tube Q2A2, the third switch tube Q3A2, the thirteenth switch tube Q1B2, and the sixteenth switch tube Q4B2 are all turned off; the second switch tube Q2A1, the third switch tube Q3A1, the thirteenth switch tube Q1B1, and the sixteenth switch tube Q4B1 in the first basic unit are all turned on, and the first switch tube Q1A1, the fourth switch tube Q4A1, the fourteenth switch tube Q2B1, and the fifteenth switch tube Q3B1 are all turned off.

[0126] In this state, from the perspective of the A phase of the second basic unit and the first basic unit, the voltage VO3 of the first end of the second basic unit is VCFA2+VO1, where VCFA2 is the voltage on the first capacitor CFA2 in the second basic unit. From the perspective of the B phase of the second basic unit and the first basic unit, VO2 is VCFB2, where VCFB2 is the voltage on the second capacitor CFB2 in the second basic unit. Since the voltages of the first capacitor CFA2 and the second capacitor CFB2 are equal during the switching process, that is, VCFA2=VCFB2, VO3=VO2+VO1. In this way, and in accordance with the second recursive relationship VO N+1 =VO N +VO N-1 consistent.

[0127] Since the second combination state is opposite to the first combination state, when the first switch component of the second basic unit is in the second combination state and the first switch component of the first basic unit is in the first combination state, the second recursive relationship VO can still be obtained. N+1 =VO N +VO N-1 . I will not go into details here.

[0128] In one possible embodiment, see Figure 2 and Figure 3 , the recursive relationship includes a third recursive relationship; the multi-ratio switched capacitor voltage conversion circuit obtains the third recursive relationship VO in the third working mode. N+1 =2VO N -VO N-1 Based on the third recursive relationship and the voltage VO1 of the first terminal of the second unit, the input voltage is converted into an output voltage, wherein the input voltage is 2 times the output voltage. N+1 times.

[0129] In the third working mode, when the first switch component of the Nth basic unit is in the third combination state, the first switch component of the N-1th basic unit is in the first combination state or the third combination state; when the first switch component of the Nth basic unit is in the fourth combination state, the first switch component of the N-1th basic unit is in the second combination state or the fourth combination state.

[0130] In the first combination state, the first switch tube Q1A, the fourth switch tube Q4A, the fourteenth switch tube Q2B, and the fifteenth switch tube Q3B are all turned on, and the second switch tube Q2A, the third switch tube Q3A, the thirteenth switch tube Q1B, and the sixteenth switch tube Q4B are all turned off.

[0131] In the second combination state, the second switch tube Q2A, the third switch tube Q3A, the thirteenth switch tube Q1B, and the sixteenth switch tube Q4B are all turned on, and the first switch tube Q1A, the fourth switch tube Q4A, the fourteenth switch tube Q2B, and the fifteenth switch tube Q3B are all turned off.

[0132] In the third combination state, the first switch tube Q1A, the fourth switch tube Q4A, the fifteenth switch tube Q3B, and the sixteenth switch tube Q4B are all turned on, and the third switch tube Q3A, the second switch tube Q2A, the thirteenth switch tube Q1B, and the fourteenth switch tube Q2B are all turned off.

[0133] In the fourth combination state, the third switch tube Q3A, the fourth switch tube Q4A, the thirteenth switch tube Q1B, and the sixteenth switch tube Q4B are all turned on, and the first switch tube Q1A, the second switch tube Q2A, the fourteenth switch tube Q2B, and the fifteenth switch tube Q3B are all turned off.

[0134] In the embodiment of the present application, the multi-ratio switched capacitor voltage conversion circuit is in the third working mode, according to the third recursive relationship VO N+1 =2VO N -VO N-1 Based on the relationship between the voltage VO1 at the first end of the second unit and the output voltage VOUT, that is, VO1 = 2VOUT, and so on, the voltage VO at the first end of the Nth basic unit can be obtained. N+1 The voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be obtained, that is, the voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be obtained, so that the input voltage is 2 times the output voltage N+1 times.

[0135] In the third and fourth combination states, the fourth switch tube Q4A and the sixteenth switch tube Q4B are in the normally open state, the second switch tube Q2A and the thirteenth switch tube Q2B are in the normally closed state, and the first switch tube Q1A, the third switch tube Q3A, the thirteenth switch tube Q1B and the fifteenth switch tube Q3B switch back and forth.

[0136] In the third working mode, it is necessary to ensure that the first switch tube in the Nth basic unit and the first switch tube in the (N-1)th basic unit are turned on or off at the same time.

[0137] In this embodiment, N is still set to 2 to explain the process of obtaining the third recursive relationship in the third working mode, that is, the multi-ratio switched capacitor voltage conversion circuit includes two basic units and a second unit, namely, a first basic unit, a second basic unit and a second unit.

[0138] See also Figure 2 In the third working mode, when the first switch component of the second basic unit is in the third combination state, the first switch component of the first basic unit is in the first combination state or the third combination state, that is, the first switch tube Q1A2, the fourth switch tube Q4A2, the fifteenth switch tube Q3B2, and the sixteenth switch tube Q4B2 in the second basic unit are all turned on, and the third switch tube Q3A2, the second switch tube Q2A2, the thirteenth switch tube Q1B2, and the fourteenth switch tube Q2B2 are all turned off; the first switch tube Q1A1, The fourth switching tube Q4A1, the fourteenth switching tube Q2B1, and the fifteenth switching tube Q3B1 are all turned on, and the second switching tube Q2A1, the third switching tube Q3A1, the thirteenth switching tube Q1B1, and the sixteenth switching tube Q4B1 are all turned off, or the first switching tube Q1A1, the fourth switching tube Q4A1, the fifteenth switching tube Q3B1, and the sixteenth switching tube Q4B1 in the first basic unit are all turned on, and the third switching tube Q3A1, the second switching tube Q2A1, the thirteenth switching tube Q1B1, and the fourteenth switching tube Q2B2 are all turned off.

[0139] In this state, from the perspective of the A phase of the second basic unit and the first basic unit, the voltage of the first end of the second basic unit VO3 = VCFA2 + VO2, where VCFA2 is the voltage on the first capacitor CFA2 in the second basic unit. From the perspective of the B phase of the second basic unit and the first basic unit, VO2 = VCFB2 + VO1, where VCFB2 is the voltage on the second capacitor CFB2 in the second basic unit. Since the voltages of the first capacitor CFA2 and the second capacitor CFB2 are equal during the switching process, that is, VCFA2 = VCFB2, then VO3 = 2VO2 - VO1. In this way, and with the third recursive relationship VO N+1 =2VO N -VO N-1 consistent.

[0140] When the first switch component of the second basic unit is in the fourth combination state, the first switch component of the first basic unit is in the second combination state or the fourth combination state, which is consistent with the principle of the above embodiment, and the third recursive relationship VO can still be obtained. N+1 =2VO N-VO N-1 . I will not go into details here.

[0141] In one possible embodiment, see Figure 2 and Figure 3 , the recursive relationship includes a fourth recursive relationship; the multi-ratio switched capacitor voltage conversion circuit obtains a fourth recursive relationship VO in the fourth working mode. N+1 =VO N Based on the fourth recursive relationship and the voltage VO1 of the first terminal of the second unit, the input voltage is converted into the output voltage. The input voltage is 2 times the output voltage. N+1 times.

[0142] In the fourth working mode, the first switch component of the Nth basic unit is in the fifth combination state.

[0143] In the fifth combination state, the first switch tube Q1A, the third switch tube Q3A, the thirteenth switch tube Q1B, and the fifteenth switch tube Q3B are all turned on, and the second switch tube Q2A, the fourth switch tube Q4A, the fourteenth switch tube Q2B, and the sixteenth switch tube Q4B are all turned off.

[0144] In the embodiment of the present application, the multi-ratio switched capacitor voltage conversion circuit is in the fourth working mode, according to the fourth recursive relationship VO N+1 =VO N Based on the relationship between the voltage VO1 at the first end of the second unit and the output voltage VOUT, that is, VO1 = 2VOUT, and so on, the voltage VO at the first end of the Nth basic unit can be obtained. N+1 The voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be obtained, that is, the voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be obtained, so that the input voltage is 2 times the output voltage N+1 times.

[0145] In the fourth working mode, the first terminal of the Nth basic unit is directly connected to the first terminal of the N-1th basic unit, so that the voltage VO of the first terminal of the Nth basic unit is N+1 and the voltage VO of the first terminal of the N-1th basic unit N If they are equal, we can get the fourth recursive relation VO N+1 =VO N .

[0146] Based on the first working mode, the second working mode, the third working mode and the fourth working mode, the multi-ratio switched capacitor voltage conversion circuit can convert the input voltage into the output voltage, and the input voltage is 2 times the output voltage. N+1 Depending on the number N of basic units, various voltage conversion ratios between input voltage and output voltage can be achieved.

[0147] Based on the understanding of the above embodiment, the process of realizing multiple voltage conversion ratios of the multi-ratio switched capacitor voltage conversion circuit is described by taking N=1 as an example. Figure 4 , Figure 4 An embodiment of the present application provides a multi-ratio switched capacitor voltage conversion circuit including a basic unit. When N=1, the multi-ratio switched capacitor voltage conversion circuit includes a first unit and a second unit, and the first unit includes a basic unit.

[0148] In the first operating mode, referring to Figures 5(a) and 5(b), Figure 5(a) is a schematic diagram of the first stage of the multi-ratio switched capacitor voltage conversion circuit in the first operating mode, and Figure 5(b) is a schematic diagram of the second stage of the multi-ratio switched capacitor voltage conversion circuit in the first operating mode. In the first operating mode, in the first stage, the first switch component in the first unit is in the first combination state, and the second unit is in the second state; in the second stage, the first switch component in the first unit is in the second combination state, and the second unit is in the first state.

[0149] As shown in FIG5(a), in the first stage, the first switch tube Q1A1, the fourth switch tube Q4A1, the fourteenth switch tube Q2B1, and the fifteenth switch tube Q3B1 are all turned on, and the second switch tube Q2A1, the third switch tube Q3A1, the thirteenth switch tube Q1B1, and the sixteenth switch tube Q4B1 are all turned off; the fifth switch tube Q5, the seventh switch tube Q7, the tenth switch tube Q10, and the twelfth switch tube Q12 are all turned on, and the sixth switch tube Q6, the eighth switch tube Q8, the ninth switch tube Q9, and the eleventh switch tube Q11 are all turned off.

[0150] As shown in FIG5(b), in the second stage, the second switch tube Q2A1, the third switch tube Q3A1, the thirteenth switch tube Q1B1, and the sixteenth switch tube Q4B1 are all turned on, and the first switch tube Q1A1, the fourth switch tube Q4A1, the fourteenth switch tube Q2B1, and the fifteenth switch tube Q3B1 are all turned off; the sixth switch tube Q6, the eighth switch tube Q8, the ninth switch tube Q9, and the eleventh switch tube Q11 are all turned on, and the fifth switch tube Q5, the seventh switch tube Q7, the tenth switch tube Q10, and the twelfth switch tube Q12 are all turned off.

[0151] In the first working mode, according to the first recursive relationship VO N+1 =2VO N When N=1, VO2=2VO1, and VO1=2VOUT, so VO2=4VOUT. The voltage conversion ratio between the input voltage VIN and the output voltage VOUT is 4:1, making the input voltage VIN 4 times the output voltage VOUT.

[0152] The multi-ratio switched capacitor voltage converter circuit switches back and forth between the first stage and the second stage, so that the multi-ratio switched capacitor voltage converter circuit achieves a 4:1 conversion between the input voltage VIN and the output voltage VOUT in the first working mode.

[0153] In the second operating mode, referring to Figures 6(a) and 6(b), Figure 6(a) is a schematic diagram of the first stage of the multi-ratio switched capacitor voltage conversion circuit in the second operating mode, and Figure 6(b) is a schematic diagram of the second stage of the multi-ratio switched capacitor voltage conversion circuit in the second operating mode. In the second operating mode, in the first stage, the first switch component in the first unit is in the first combination state, and the second unit is in the first state; in the second stage, the first switch component in the first unit is in the second combination state, and the second unit is in the second state.

[0154] As shown in FIG6(a), in the first stage, the first switch tube Q1A1, the fourth switch tube Q4A1, the fourteenth switch tube Q2B1, and the fifteenth switch tube Q3B1 are all turned on, and the second switch tube Q2A1, the third switch tube Q3A1, the thirteenth switch tube Q1B1, and the sixteenth switch tube Q4B1 are all turned off; the sixth switch tube Q6, the eighth switch tube Q8, the ninth switch tube Q9, and the eleventh switch tube Q11 are all turned on, and the fifth switch tube Q5, the seventh switch tube Q7, the tenth switch tube Q10, and the twelfth switch tube Q12 are all turned off.

[0155] As shown in FIG6(b), in the second stage, the second switch tube Q2A1, the third switch tube Q3A1, the thirteenth switch tube Q1B1, and the sixteenth switch tube Q4B1 are all turned on, and the first switch tube Q1A1, the fourth switch tube Q4A1, the fourteenth switch tube Q2B1, and the fifteenth switch tube Q3B1 are all turned off; the fifth switch tube Q5, the seventh switch tube Q7, the tenth switch tube Q10, and the twelfth switch tube Q12 are all turned on, and the sixth switch tube Q6, the eighth switch tube Q8, the ninth switch tube Q9, and the eleventh switch tube Q11 are all turned off.

[0156] In the second working mode, according to the second recursive relationship VO N+1 =VO N +VO N-1 When N=1, VO2=VO1+VO0, and VO1=2VOUT. Considering VO0 as VOUT, we can obtain VO2=2VOUT+VOUT=3VOUT. The voltage conversion ratio between the input voltage VIN and the output voltage VOUT is 3:1, making the input voltage VIN three times the output voltage VOUT.

[0157] The multi-ratio switched capacitor voltage converter circuit switches back and forth between the first stage and the second stage, so that the multi-ratio switched capacitor voltage converter circuit realizes a 3:1 conversion between the input voltage VIN and the output voltage VOUT in the second working mode.

[0158] In the third operating mode, referring to Figures 7(a) and 7(b), Figure 7(a) is a schematic diagram of the first stage of the multi-ratio switched capacitor voltage conversion circuit in the third operating mode, and Figure 7(b) is a schematic diagram of the second stage of the multi-ratio switched capacitor voltage conversion circuit in the third operating mode. In the third operating mode, in the first stage, the first switch component in the first unit is in the third combination state, and the second unit is in the second state; in the second stage, the first switch component in the first unit is in the fourth combination state, and the second unit is in the first state.

[0159] As shown in FIG7( a ), in the first stage, the first switch tube Q1A1, the fourth switch tube Q4A1, the fifteenth switch tube Q3B1, and the sixteenth switch tube Q4B1 are all turned on, and the third switch tube Q3A1, the second switch tube Q2A1, the thirteenth switch tube Q1B1, and the fourteenth switch tube Q2B1 are all turned off; the fifth switch tube Q5, the seventh switch tube Q7, the tenth switch tube Q10, and the twelfth switch tube Q12 are all turned on, and the sixth switch tube Q6, the eighth switch tube Q8, the ninth switch tube Q9, and the eleventh switch tube Q11 are all turned off.

[0160] As shown in FIG7( b), in the second stage, the third switch tube Q3A1, the fourth switch tube Q4A1, the thirteenth switch tube Q1B1, and the sixteenth switch tube Q4B1 are all turned on, and the first switch tube Q1A1, the second switch tube Q2A1, the fourteenth switch tube Q2B1, and the fifteenth switch tube Q3B1 are all turned off; the sixth switch tube Q6, the eighth switch tube Q8, the ninth switch tube Q9, and the eleventh switch tube Q11 are all turned on, and the fifth switch tube Q5, the seventh switch tube Q7, the tenth switch tube Q10, and the twelfth switch tube Q12 are all turned off.

[0161] In the third working mode, according to the third recursive relationship VO N+1 =2VO N -VO N-1 When N=1, VO2=2VO1-VO0, and VO1=2VOUT. Considering VO0 as VOUT, we can obtain VO2=4VOUT-VOUT=3VOUT. The voltage conversion ratio between the input voltage VIN and the output voltage VOUT is 3:1, making the input voltage VIN 3 times the output voltage VOUT.

[0162] The multi-ratio switched capacitor voltage converter circuit switches back and forth between the first stage and the second stage, so that the multi-ratio switched capacitor voltage converter circuit achieves a 3:1 conversion between the input voltage VIN and the output voltage VOUT in the third operating mode.

[0163] In the fourth operating mode, referring to Figures 8(a) and 8(b), Figure 8(a) is a schematic diagram of the first stage of the multi-ratio switched capacitor voltage conversion circuit in the fourth operating mode, and Figure 8(b) is a schematic diagram of the second stage of the multi-ratio switched capacitor voltage conversion circuit in the fourth operating mode. In the fourth operating mode, in the first stage, the first switch component in the first unit is in the fifth combination state, and the second unit is in the first state; in the second stage, the first switch component in the first unit is in the fifth combination state, and the second unit is in the second state.

[0164] As shown in FIG8( a ), in the first stage, the first switch tube Q1A1, the third switch tube Q3A1, the thirteenth switch tube Q1B1, and the fifteenth switch tube Q3B1 are all turned on, and the second switch tube Q2A1, the fourth switch tube Q4A1, the fourteenth switch tube Q2B1, and the sixteenth switch tube Q4B1 are all turned off; the sixth switch tube Q6, the eighth switch tube Q8, the ninth switch tube Q9, and the eleventh switch tube Q11 are all turned on, and the fifth switch tube Q5, the seventh switch tube Q7, the tenth switch tube Q10, and the twelfth switch tube Q12 are all turned off.

[0165] As shown in FIG8( b), in the second stage, the first switch tube Q1A1, the third switch tube Q3A1, the thirteenth switch tube Q1B1, and the fifteenth switch tube Q3B1 are all turned on, and the second switch tube Q2A1, the fourth switch tube Q4A1, the fourteenth switch tube Q2B1, and the sixteenth switch tube Q4B1 are all turned off; the fifth switch tube Q5, the seventh switch tube Q7, the tenth switch tube Q10, and the twelfth switch tube Q12 are all turned on, and the sixth switch tube Q6, the eighth switch tube Q8, the ninth switch tube Q9, and the eleventh switch tube Q11 are all turned off.

[0166] In the fourth working mode, according to the fourth recursive relationship VO N+1 =VO N When N=1, VO2=VO1, and VO1=2VOUT, so VO2=2VOUT. The voltage conversion ratio between the input voltage VIN and the output voltage VOUT is 2:1, so that the input voltage VIN is twice the output voltage VOUT.

[0167] The multi-ratio switched capacitor voltage converter circuit switches back and forth between the first stage and the second stage, so that the multi-ratio switched capacitor voltage converter circuit achieves a 2:1 conversion between the input voltage VIN and the output voltage VOUT in the fourth operating mode.

[0168] Through the above embodiments, it can be seen that the multi-ratio switched capacitor voltage conversion circuit can convert the input voltage VIN into the output voltage VOUT according to the switching states of the first switch component and the second switch component when N=1, and the voltage conversion ratio between the input voltage VIN and the output voltage VOUT can be 4:1, 3:1, or 2:1.

[0169] An embodiment of the present application further provides a chip, comprising: the multi-ratio switched capacitor voltage conversion circuit as described above.

[0170] The chip may be a switched capacitor voltage converter.

[0171] An embodiment of the present application also provides an electronic device, including: the chip as described above.

[0172] Electronic devices may include, but are not limited to: adapters, chargers, tablets, smart home devices, vehicles, and wearable devices.

[0173] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection 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 plurality of basic units, the plurality of basic units including: a first basic unit, a second basic unit, ..., an N-1th basic unit, and an Nth basic unit, where N is an integer greater than or equal to 1; each of the basic units includes a first capacitor, a second capacitor, and a first switch component, and the second unit includes a third capacitor, a fourth capacitor, and a second switch component; The first end of the Nth basic unit serves as an input end of the multi-ratio switched capacitor voltage conversion circuit, and is used to receive an input voltage. The second end of the Nth basic unit and the fourth end of the Nth basic unit are both electrically connected to the first end of the N-1th basic unit. The third end of the Nth basic unit is electrically connected to the first plate of the first capacitor in the N-1th basic unit. The fifth end of the Nth basic unit is electrically connected to the first plate of the second capacitor in the N-1th basic unit. The second end of the first basic unit and the fourth end of the first basic unit are both electrically connected to the first end of the second unit, the third end of the first basic unit is electrically connected to the first plate of the third capacitor, the fifth end of the first basic unit is electrically connected to the first plate of the fourth capacitor, and the second end of the second unit serves as the output end of the multi-ratio switched capacitor voltage conversion circuit, for outputting an output voltage; The second switch component is used to control the connection relationship between the third capacitor and the fourth capacitor so that the voltage at the first end of the second unit is twice the output voltage; The multi-ratio switched capacitor voltage conversion circuit is used to obtain a recursive relationship according to the switching state of the first switch component in each of the basic units, and convert the input voltage into an output voltage based on the recursive relationship and the voltage of the first end of the second unit, wherein the input voltage is 2 times the output voltage. N+1 times, N is the number of the basic units.

2. The multi-ratio switched capacitor voltage conversion circuit according to claim 1, characterized in that: The first switch assembly includes: a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a thirteenth switch tube, a fourteenth switch tube, a fifteenth switch tube and a sixteenth switch tube; The drain of the first switching transistor is electrically connected to the drain of the thirteenth switching transistor and serves as the first end of the basic unit. The source of the first switching transistor is electrically connected to the drain of the third switching transistor and the first plate of the first capacitor, respectively. The source of the third switching transistor serves as the second end of the basic unit. The second electrode plate of the first capacitor is electrically connected to the drain of the second switching transistor and the source of the fourth switching transistor respectively, the source of the second switching transistor is grounded, and the drain of the fourth switching transistor serves as the third terminal of the basic unit; The source of the thirteenth switch is electrically connected to the drain of the fifteenth switch and the first plate of the second capacitor, respectively, and the source of the fifteenth switch serves as the fourth terminal of the basic unit; The second electrode plate of the second capacitor is electrically connected to the drain of the fourteenth switch tube and the source of the sixteenth switch tube respectively. The source of the fourteenth switch tube is grounded, and the drain of the sixteenth switch tube serves as the fifth end of the basic unit.

3. The multi-ratio switched capacitor voltage conversion circuit according to claim 1, wherein: The second switch component includes: a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube, and a twelfth switch tube; the second unit also includes: a fifth capacitor and a sixth capacitor; The drain of the fifth switching transistor is electrically connected to the drain of the ninth switching transistor and the first plate of the fifth capacitor, and serves as the first end of the second unit. The source of the fifth switching transistor is electrically connected to the first plate of the third capacitor and the drain of the sixth switching transistor. The source of the sixth switching tube is electrically connected to the drain of the seventh switching tube, the first plate of the sixth capacitor, the source of the tenth switching tube, and the drain of the eleventh switching tube respectively; The second electrode plate of the third capacitor is electrically connected to the source of the seventh switching transistor and the drain of the eighth switching transistor respectively, and the source of the eighth switching transistor is grounded; The source of the ninth switching tube is electrically connected to the drain of the tenth switching tube and the first plate of the fourth capacitor respectively; The second electrode plate of the fourth capacitor is electrically connected to the source of the eleventh switching tube and the drain of the twelfth switching tube respectively, and the source of the twelfth switching tube is grounded; The second plate of the fifth capacitor and the second plate of the sixth capacitor are both grounded.

4. The multi-ratio switched capacitor voltage conversion circuit according to claim 3, characterized in that: The second switch component switches between a first state and a second state to control the connection relationship between the third capacitor and the fourth capacitor so that the voltage at the first end of the second unit is twice the output voltage; Wherein, in the first state, the sixth switch tube, the eighth switch tube, the ninth switch tube, and the eleventh switch tube are all turned on, and the fifth switch tube, the seventh switch tube, the tenth switch tube, and the twelfth switch tube are all turned off; In the second state, the fifth switch tube, the seventh switch tube, the tenth switch tube, and the twelfth switch tube are all turned on, and the sixth switch tube, the eighth switch tube, the ninth switch tube, and the eleventh switch tube are all turned off.

5. The multi-ratio switched capacitor voltage conversion circuit according to claim 2, wherein: The recursive relationship includes a first recursive relationship; The multi-ratio switched capacitor voltage conversion circuit obtains the first recursive relationship in the first working mode, and converts the input voltage into an output voltage based on the first recursive relationship and the voltage of the first end of the second unit, wherein the input voltage is 2 times the output voltage. N+1 times; In the first working mode, when the first switch component of the Nth basic unit is in the first combination state, the first switch component of the N-1th basic unit is in the first combination state; when the first switch component of the Nth basic unit is in the second combination state, the first switch component of the N-1th basic unit is in the second combination state; Wherein, in the first combination state, the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned on, and the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned off; In the second combination state, the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned on, and the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned off.

6. The multi-ratio switched capacitor voltage conversion circuit according to claim 2, characterized in that: The recursive relationship includes a second recursive relationship; The multi-ratio switched capacitor voltage conversion circuit obtains the second recursive relationship in the second working mode, and converts the input voltage into an output voltage based on the second recursive relationship and the voltage of the first end of the second unit, wherein the input voltage is 2 times the output voltage. N+1 times; In the second working mode, when the first switch component of the Nth basic unit is in the first combination state, the first switch component of the N-1th basic unit is in the second combination state; when the first switch component of the Nth basic unit is in the second combination state, the first switch component of the N-1th basic unit is in the first combination state; Wherein, in the first combination state, the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned on, and the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned off; In the second combination state, the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned on, and the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned off.

7. The multi-ratio switched capacitor voltage conversion circuit according to claim 2, wherein: The recursive relationship includes a third recursive relationship; The multi-ratio switched capacitor voltage conversion circuit obtains the third recursive relationship in the third working mode, and converts the input voltage into an output voltage based on the third recursive relationship and the voltage of the first end of the second unit, wherein the input voltage is 2 times the output voltage. N+1 times; In the third operating mode, when the first switch component of the Nth basic unit is in the third combination state, the first switch component of the N-1th basic unit is in the first combination state or the third combination state; when the first switch component of the Nth basic unit is in the fourth combination state, the second switch component of the N-1th basic unit is in the second combination state or the fourth combination state; Wherein, in the first combination state, the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned on, and the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned off; In the second combination state, the second switch tube, the third switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned on, and the first switch tube, the fourth switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned off; In the third combination state, the first switch tube, the fourth switch tube, the fifteenth switch tube, and the sixteenth switch tube are all turned on, and the third switch tube, the second switch tube, the thirteenth switch tube, and the fourteenth switch tube are all turned off; In the fourth combination state, the third switch tube, the fourth switch tube, the thirteenth switch tube, and the sixteenth switch tube are all turned on, and the first switch tube, the second switch tube, the fourteenth switch tube, and the fifteenth switch tube are all turned off.

8. The multi-ratio switched capacitor voltage conversion circuit according to claim 2, characterized in that: The recursive relationship includes a fourth recursive relationship; The multi-ratio switched capacitor voltage conversion circuit obtains the fourth recursive relationship in the fourth working mode, and converts the input voltage into an output voltage based on the fourth recursive relationship and the voltage of the first end of the second unit, wherein the input voltage is 2 times the output voltage. N+1 times; In the fourth working mode, the first switch component of the Nth basic unit is in the fifth combination state; In the fifth combination state, the first switch tube, the third switch tube, the thirteenth switch tube, and the fifteenth switch tube are all turned on, and the second switch tube, the fourth switch tube, the fourteenth switch tube, and the sixteenth switch tube are all turned off.

9. A chip, characterized in that: include: The multi-ratio switched capacitor voltage conversion circuit according to any one of claims 1 to 8.

10. An electronic device, characterized in that: include: The chip as claimed in claim 9.

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