Multi-mode switched capacitor voltage conversion circuit, voltage converter and power supply chip

Abstract

The embodiment of the invention provides a multi-mode switched capacitor voltage conversion circuit, a voltage converter and a power supply chip. The multi-mode switched capacitor voltage conversion circuit comprises a voltage conversion circuit and an auxiliary circuit, the voltage conversion circuit converts an input voltage into a first output voltage in a first working mode, and the voltage conversion circuit is matched with the auxiliary circuit in a second working mode to convert the input voltage into a second output voltage, in the third working mode, the input voltage is converted into the third output voltage, the first output voltage is larger than the second output voltage, the second output voltage is larger than the third output voltage, the change of the output voltage can be reduced when the working modes are switched, the stability of the output voltage can be improved, and therefore the stability of the circuit is improved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of integrated circuit technologies, and particularly to a multi-mode switched-capacitor voltage conversion circuit, a voltage converter, and a power supply chip. Background Art

[0002] A switched-capacitor voltage converter is a DC-DC converter that stores energy using capacitors and can convert a DC input voltage into a DC output voltage. Since the switched-capacitor voltage converter does not include an inductor, it has low losses in use and is thus widely applied to various power management scenarios.

[0003] Existing switched-capacitor voltage conversion circuits include two operating modes: 2:3 and 1:1. Within a certain input voltage range, by switching between these two operating modes, the output voltage can be relatively stable within a certain range. However, when switching between the 2:3 operating mode and the 1:1 operating mode, the change in the output voltage is approximately half of the input voltage, resulting in a relatively large change in the output voltage and poor stability of the circuit. Summary of the Invention

[0004] The present disclosure provides a multi-mode switched-capacitor voltage conversion circuit, a voltage converter, and a power supply chip, which can reduce the change in the output voltage, improve the stability of the output voltage, and thus enhance the circuit stability.

[0005] In a first aspect, the present disclosure provides a multi-mode switched-capacitor voltage conversion circuit, including a voltage conversion circuit and an auxiliary circuit. The voltage conversion circuit is connected between a voltage input terminal and ground, the output terminal of the voltage conversion circuit is connected to a voltage output terminal, the first end of the auxiliary circuit is connected to a first auxiliary node of the voltage conversion circuit, the second end of the auxiliary circuit is connected to a second auxiliary node of the voltage conversion circuit, and the third end of the auxiliary circuit is grounded.

[0006] The voltage conversion circuit is configured to convert an input voltage into a first output voltage in a first operating mode, cooperate with the auxiliary circuit to convert the input voltage into a second output voltage in a second operating mode, and convert the input voltage into a third output voltage in a third operating mode. Wherein, the first output voltage is greater than the second output voltage, and the second output voltage is greater than the third output voltage.

[0007] In some embodiments of the present disclosure, the auxiliary circuit includes an auxiliary flying capacitor, a first auxiliary switch, and a second auxiliary switch. The second electrode plate of the auxiliary flying capacitor is connected to the second auxiliary node, the first electrode plate of the auxiliary flying capacitor is connected to the first end of the first auxiliary switch and the first end of the second auxiliary switch, the second end of the first auxiliary switch is connected to the first auxiliary node, and the second end of the second auxiliary switch is grounded.

[0008] In the first operating mode and the third operating mode, both the first auxiliary switch and the second auxiliary switch are closed. In the second operating mode, either the first auxiliary switch or the second auxiliary switch is turned on.

[0009] In some embodiments of the present disclosure, the voltage conversion circuit includes a first voltage conversion circuit and a second voltage conversion circuit. The first voltage conversion circuit and the second voltage conversion circuit are connected in parallel between the voltage input terminal and the ground. The output terminal of the first voltage conversion circuit and the output terminal of the second voltage conversion circuit are connected to the voltage output terminal. The first auxiliary node of the first voltage conversion circuit is connected to the first end of the auxiliary circuit, and the second auxiliary node of the second voltage conversion circuit is connected to the second end of the auxiliary circuit.

[0010] The first voltage conversion circuit is configured to convert the input voltage into the first output voltage in the first phase, cooperate with the auxiliary circuit to convert the input voltage into the second output voltage in the third phase, and convert the input voltage into the third output voltage in the fifth phase. The second voltage conversion circuit is configured to convert the input voltage into the first output voltage in the second phase, cooperate with the auxiliary circuit to convert the input voltage into the second output voltage in the fourth phase, and convert the input voltage into the third output voltage in the fifth phase.

[0011] Wherein, the first operating mode includes the first phase and the second phase, the second operating mode includes the third phase and the fourth phase, and the third operating mode includes the fifth phase.

[0012] In some embodiments of the present disclosure, the first operating mode is a 2:3 operating mode, the second operating mode is a 4:5 operating mode, and the third operating mode is a 1:1 operating mode.

[0013] The first voltage conversion circuit includes a first flying capacitor and a second flying capacitor. In the first phase and the third phase, the first flying capacitor and the second flying capacitor are connected in parallel between the voltage input terminal and the voltage output terminal. In the second phase, the first flying capacitor and the second flying capacitor are connected in series between the voltage input terminal and the ground. In the fourth phase, the first flying capacitor and the second flying capacitor are connected in series between the voltage input terminal and the first auxiliary node, and the auxiliary flying capacitor is connected between the voltage input terminal and the first auxiliary node. In the fifth phase, the first flying capacitor and the second flying capacitor are not connected.

[0014] In some embodiments of the present disclosure, the first operating mode is a 2:3 operating mode, the second operating mode is a 4:5 operating mode, and the third operating mode is a 1:1 operating mode.

[0015] The second voltage conversion circuit includes a third flying capacitor and a fourth flying capacitor. In the first phase, the third flying capacitor and the fourth flying capacitor are connected in series between the voltage input terminal and the ground. In the second phase and the fourth phase, the third flying capacitor and the fourth flying capacitor are connected in parallel between the voltage input terminal and the voltage output terminal. In the third phase, the third flying capacitor, the fourth flying capacitor, and the auxiliary flying capacitor are connected in series between the voltage input terminal and the ground. In the fifth phase, the third flying capacitor and the fourth flying capacitor are not connected.

[0016] In some embodiments of the present disclosure, the first voltage conversion circuit further 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, and a seventh switching transistor. The first ends of the first switching transistor, the second switching transistor, and the third switching transistor are connected to the voltage input terminal. The second end of the first switching transistor is connected to the first end of the fifth switching transistor and the first plate of the first flying capacitor. The second plate of the first flying capacitor is connected to the second end of the second switching transistor and the first end of the fourth switching transistor.

[0017] The second end of the fourth switching transistor is connected to the first plate of the second flying capacitor and the first end of the sixth switching transistor. The second ends of the fifth switching transistor and the sixth switching transistor are connected to the voltage output terminal. The second plate of the second flying capacitor is connected to the second end of the third switching transistor, the first end of the seventh switching transistor, and the first auxiliary node. The second end of the seventh switching transistor is grounded.

[0018] In some embodiments of the present disclosure, the second voltage conversion circuit further includes an eighth switching transistor, a ninth switching transistor, a tenth switching transistor, an eleventh switching transistor, a twelfth switching transistor, a thirteenth switching transistor, and a fourteenth switching transistor. The first ends of the eighth switching transistor, the ninth switching transistor, and the tenth switching transistor are connected to the voltage input terminal. The second end of the eighth switching transistor is connected to the first end of the twelfth switching transistor and the first plate of the third flying capacitor. The second plate of the third flying capacitor is connected to the second end of the ninth switching transistor and the first end of the eleventh switching transistor.

[0019] The second terminal of the eleventh switching transistor is connected to the first electrode plate of the fourth flying capacitor and the first terminal of the thirteenth switching transistor. The second terminals of the twelfth switching transistor and the thirteenth switching transistor are connected to the voltage output terminal. The second electrode plate of the fourth flying capacitor is connected to the second terminal of the tenth switching transistor, the first terminal of the fourteenth switching transistor, and the second auxiliary node. The second terminal of the fourteenth switching transistor is grounded.

[0020] In some embodiments of the present disclosure, the multi-mode switched-capacitor voltage conversion circuit further includes an output capacitor, and the output capacitor is connected between the voltage output terminal and the ground.

[0021] In a second aspect, the present disclosure provides a voltage converter, including any of the multi-mode switched-capacitor voltage conversion circuits provided in the first aspect.

[0022] In a third aspect, the present disclosure provides a power supply chip, including any of the multi-mode switched-capacitor voltage conversion circuits provided in the first aspect.

[0023] The technical solution of the present disclosure provides a multi-mode switched-capacitor voltage conversion circuit, including a voltage conversion circuit and an auxiliary circuit. The voltage conversion circuit converts an input voltage into a first output voltage in a first operating mode, cooperates with the auxiliary circuit in a second operating mode to convert the input voltage into a second output voltage, and converts the input voltage into a third output voltage in a third operating mode. The first output voltage is greater than the second output voltage, and the second output voltage is greater than the third output voltage. It can reduce the change of the output voltage during the switching of the operating mode, improve the stability of the output voltage, and thus enhance the circuit stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. It should be understood that the following described drawings only relate to some embodiments of the present disclosure and do not limit the present disclosure, where:

[0025] Figure 1 FIG. 21 is a circuit schematic diagram of a switched-capacitor voltage converter provided by the prior art.

[0026] Figure 2 FIG. 25 is a schematic diagram of the output voltage of the switched-capacitor voltage converter provided by the prior art.

[0027] Figure 3 FIG. 29 is a structural schematic diagram of a multi-mode switched-capacitor voltage conversion circuit provided by an embodiment of the present disclosure.

[0028] Figure 4 FIG. 33 is a circuit schematic diagram of a multi-mode switched-capacitor voltage conversion circuit provided by an embodiment of the present disclosure.

[0029] Figure 5 This is the equivalent circuit diagram of the multi-mode switched-capacitor voltage conversion circuit in the first operating mode provided by the embodiments of the present disclosure.

[0030] Figure 6 This is the equivalent circuit diagram of the multi-mode switched-capacitor voltage conversion circuit in the second operating mode provided by the embodiments of the present disclosure.

[0031] Figure 7 This is the schematic diagram of the output voltage of the multi-mode switched-capacitor voltage conversion circuit provided by the embodiments of the present disclosure. Detailed implementation manners

[0032] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those skilled in the art without creative efforts based on the described embodiments of the present disclosure also belong to the scope of protection of the present disclosure.

[0033] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the subject matter of the present disclosure belongs. Further, it will be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the specification and the relevant art, and will not be interpreted in an idealized or overly formal form unless expressly defined herein. As used herein, the statement of joining two or more parts together shall mean that these parts are directly joined together or joined through one or more intermediate components.

[0034] Reference to "embodiments" in the present disclosure means that a particular feature, structure or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase "embodiments" appearing in various places in the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in the present disclosure can be combined with other embodiments.

[0035] In addition, terms such as "first", "second", etc. in the specification and claims of the present disclosure or in the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more of such features.

[0036] In the present disclosure, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: the existence of A, the coexistence of A and B, and the existence of B. Additionally, in this text, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the description of the present disclosure, unless otherwise specified, the meanings of "multiple" and "at least two" refer to more than two (including two). Similarly, "multiple groups" and "at least two groups" refer to more than two groups (including two groups).

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0039] Figure 1 A circuit schematic diagram of a switched-capacitor voltage converter provided for the prior art is as Figure 1 shown. The switched-capacitor voltage converter includes transistors Q1A, Q1B, Q2A, Q2B, Q3A, Q3B, Q4A, Q4B, Q5A, Q5B, Q6A, Q6B, Q7A, Q7B, flying capacitors CF1A, CF1B, CF2A, CF2B, and an output capacitor COUT.

[0040] Among them, the first ends of transistors Q1A, Q2A, Q3A, Q1B, Q2B, and Q3B are connected to the voltage input terminal IN. The second end of transistor Q1A is connected to the first plate of flying capacitor CF1A and the first end of transistor Q5A. The second end of transistor Q1B is connected to the first plate of flying capacitor CF1B and the first end of transistor Q5B. The second plate of flying capacitor CF1A is connected to the second end of transistor Q2A and the first end of transistor Q4A. The second plate of flying capacitor CF1B is connected to the second end of transistor Q2B and the first end of transistor Q4B.

[0041] The second terminal of transistor Q4A is connected to the first terminal of transistor Q6A and the first plate of flying capacitor CF2A. The second terminal of transistor Q4B is connected to the first terminal of transistor Q6B and the first plate of flying capacitor CF2B. The second terminals of transistor Q5A, transistor Q6A, transistor Q5B and transistor Q6B are connected to voltage output terminal OUT. The second plate of flying capacitor CF2A is connected to the second terminal of transistor Q3A and the first terminal of transistor Q7A. The second plate of flying capacitor CF2B is connected to the second terminal of transistor Q3B and the first terminal of transistor Q7B. The second terminals of transistor Q7A and transistor Q7B are grounded.

[0042] In the 2:3 operating mode, the switched-capacitor voltage converter alternately operates between a first operating state and a second operating state. Among them, in the first operating state, transistors Q1A, Q4A, Q7A, Q2B, Q3B, Q5B and Q6B are turned on, and transistors Q1B, Q4B, Q7B, Q2A, Q3A, Q5A and Q6A are turned off. Then, flying capacitors CF1A and CF2A are connected in series between voltage input terminal IN and ground, and flying capacitors CF1B and CF2B are connected in parallel between voltage input terminal IN and voltage output terminal OUT.

[0043] In the second operating state, transistors Q1A, Q4A, Q7A, Q2B, Q3B, Q5B and Q6B are turned off, and transistors Q1B, Q4B, Q7B, Q2A, Q3A, Q5A and Q6A are turned on. Then, flying capacitors CF1A and CF2A are connected in parallel between voltage input terminal IN and voltage output terminal OUT, and flying capacitors CF1B and CF2B are connected in series between voltage input terminal IN and ground.

[0044] The switched-capacitor voltage converter can receive an input voltage Vin through voltage input terminal IN, convert the input voltage Vin to Vin*3 / 2, and output it through voltage output terminal OUT. Then, the switched-capacitor voltage converter can achieve a voltage conversion with an output voltage Vout = Vin*3 / 2 in the 2:3 operating mode.

[0045] In the 1:1 operating mode, transistors Q1A, Q1B, Q2A, Q2B, Q4A, Q4B, Q5A, Q5B, Q6A, and Q6B are turned on, while transistors Q3A, Q3B, Q7A, and Q7B are turned off. The voltage input terminal IN and the voltage output terminal OUT are directly connected. Thus, the switched-capacitor voltage converter can achieve Vout = Vin in the 1:1 operating mode.

[0046] Within a certain input voltage range, for example, a 2.5V to 5V battery supplies power to the voltage input terminal IN, so the input voltage range is 2.5V to 5V. By switching between the 2:3 operating mode and the 1:1 operating mode, the output voltage Vout can be made relatively stable within a certain range. For example, the output voltage Vout is not lower than 3.3V. When the switched-capacitor voltage converter switches between the 2:3 operating mode and the 1:1 operating mode, the output voltage Vout switches between 1.5Vin and Vin, that is, the change in the output voltage Vout is approximately 0.5Vin, as Figure 2 shown. Figure 2 It is a schematic diagram of the output voltage of the switched-capacitor voltage converter provided by the prior art.

[0047] For example, as Figure 2 shown, when the input voltage Vin is 3.3V, the output voltage Vout in the 2:3 operating mode is approximately 4.95V, and the output voltage Vout in the 1:1 operating mode is approximately 3.3V. Then, the output voltage Vout differs by approximately 1.65V between the two operating modes. Obviously, the output voltage Vout changes significantly when switching between these two operating modes, resulting in poor stability of the output voltage Vout, that is, poor stability of the switched-capacitor voltage converter.

[0048] To solve the above technical problems, the present disclosure provides a multi-mode switched-capacitor voltage conversion circuit, including a voltage conversion circuit and an auxiliary circuit. The voltage conversion circuit converts the input voltage into a first output voltage in the first operating mode, cooperates with the auxiliary circuit to convert the input voltage into a second output voltage in the second operating mode, and converts the input voltage into a third output voltage in the third operating mode. The first output voltage is greater than the second output voltage, and the second output voltage is greater than the third output voltage. It can reduce the change in the output voltage when switching operating modes, improve the stability of the output voltage, and thus enhance the circuit stability.

[0049] The following uses several specific embodiments to describe in detail the technical solutions provided by the present disclosure.

[0050] Figure 3 It is a schematic structural diagram of a multi-mode switched-capacitor voltage conversion circuit provided by an embodiment of the present disclosure, as Figure 3As shown, the multi-mode switched-capacitor voltage conversion circuit 100 includes a voltage conversion circuit 110 and an auxiliary circuit 120. Among them, the voltage conversion circuit 110 is connected between the voltage input terminal IN and the ground, the output terminal of the voltage conversion circuit 110 is connected to the voltage output terminal OUT, the first terminal of the auxiliary circuit 120 is connected to the first auxiliary node A of the voltage conversion circuit 110, the second terminal of the auxiliary circuit 120 is connected to the second auxiliary node B of the voltage conversion circuit 110, and the third terminal of the auxiliary circuit 120 is grounded.

[0051] The voltage conversion circuit 110 is configured to convert the input voltage Vin into a first output voltage Vout1 in the first operating mode, cooperate with the auxiliary circuit 120 to convert the input voltage Vin into a second output voltage Vout2 in the second operating mode, and convert the input voltage Vin into a third output voltage Vout3 in the third operating mode. Among them, the first output voltage Vout1 is greater than the second output voltage Vout2, and the second output voltage Vout2 is greater than the third output voltage Vout3.

[0052] Exemplarily, as Figure 3 shown, the voltage conversion circuit 110 includes a first voltage conversion circuit 111 and a second voltage conversion circuit 112. The first voltage conversion circuit 111 and the second voltage conversion circuit 112 are connected in parallel between the voltage input terminal IN and the ground. The output terminal of the first voltage conversion circuit 111 and the output terminal of the second voltage conversion circuit 112 are connected to the voltage output terminal OUT. The first auxiliary node A of the first voltage conversion circuit 111 is connected to the first terminal of the auxiliary circuit 120, and the second auxiliary node B of the second voltage conversion circuit 112 is connected to the second terminal of the auxiliary circuit 120.

[0053] Figure 4 The circuit schematic diagram of a multi-mode switched-capacitor voltage conversion circuit provided by an embodiment of the present disclosure, as Figure 4 shown, the first voltage conversion circuit 111 includes a first flying capacitor CFLY1, a second flying capacitor CFLY2, a first switching transistor Q1, a second switching transistor Q2, a third switching transistor Q3, a fourth switching transistor Q4, a fifth switching transistor Q5, a sixth switching transistor Q6, and a seventh switching transistor Q7.

[0054] The first ends of the first switching transistor Q1, the second switching transistor Q2, and the third switching transistor Q3 are connected to the voltage input terminal IN. The second end of the first switching transistor Q1 is connected to the first end of the fifth switching transistor Q5 and the first plate of the first flying capacitor CFLY1. The second plate of the first flying capacitor CFLY1 is connected to the second end of the second switching transistor Q2 and the first end of the fourth switching transistor Q4. The second end of the fourth switching transistor Q4 is connected to the first plate of the second flying capacitor CFLY2 and the first end of the sixth switching transistor Q6. The second ends of the fifth switching transistor Q5 and the sixth switching transistor Q6 are connected to the voltage output terminal OUT. The second plate of the second flying capacitor CFLY2 is connected to the second end of the third switching transistor Q3, the first end of the seventh switching transistor Q7, and the first auxiliary node A. The second end of the seventh switching transistor Q7 is grounded.

[0055] The second voltage conversion circuit 112 includes a third flying capacitor CFLY3, a fourth flying capacitor CFLY4, an eighth switching transistor Q8, a ninth switching transistor Q9, a tenth switching transistor Q10, an eleventh switching transistor Q11, a twelfth switching transistor Q12, a thirteenth switching transistor Q13, and a fourteenth switching transistor Q14. The first ends of the eighth switching transistor Q8, the ninth switching transistor Q9, and the tenth switching transistor Q10 are connected to the voltage input terminal IN. The second end of the eighth switching transistor Q8 is connected to the first end of the twelfth switching transistor Q12 and the first plate of the third flying capacitor CFLY3. The second plate of the third flying capacitor CFLY3 is connected to the second end of the ninth switching transistor Q9 and the first end of the eleventh switching transistor Q11.

[0056] The second end of the eleventh switching transistor Q11 is connected to the first plate of the fourth flying capacitor CFLY4 and the first end of the thirteenth switching transistor Q13. The second ends of the twelfth switching transistor Q12 and the thirteenth switching transistor Q13 are connected to the voltage output terminal OUT. The second plate of the fourth flying capacitor CFLY4 is connected to the second end of the tenth switching transistor Q10, the first end of the fourteenth switching transistor Q14, and the second auxiliary node B. The second end of the fourteenth switching transistor Q14 is grounded.

[0057] The auxiliary circuit 120 includes an auxiliary flying capacitor CSFLY, a first auxiliary switch QS1, and a second auxiliary switch QS2. The second plate of the auxiliary flying capacitor CSFLY is connected to the second auxiliary node B. The first plate of the auxiliary flying capacitor CSFLY is connected to the first ends of the first auxiliary switch QS1 and the second auxiliary switch QS2. The second end of the first auxiliary switch QS1 is connected to the first auxiliary node A. The second end of the second auxiliary switch QS2 is grounded.

[0058] The first operating mode, such as the 2:3 operating mode, includes a first phase and a second phase, and the voltage conversion circuit 110 operates alternately in the first phase and the second phase. In the first phase, the first auxiliary switch QS1, the second auxiliary switch QS2, the first switching transistor Q1, the fourth switching transistor Q4, the seventh switching transistor Q7, the ninth switching transistor Q9, the tenth switching transistor Q10, the twelfth switching transistor Q12, and the thirteenth switching transistor Q13 are all turned off, and the second switching transistor Q2, the third switching transistor Q3, the fifth switching transistor Q5, the sixth switching transistor Q6, the eighth switching transistor Q8, the eleventh switching transistor Q11, and the fourteenth switching transistor Q14 are all turned on.

[0059] Figure 5 The equivalent circuit diagram of the multi-mode switched-capacitor voltage conversion circuit in the first operating mode provided by the embodiments of the present disclosure is as Figure 5 shown in part (a) of the figure. In the first phase, the first flying capacitor CFLY1 and the second flying capacitor CFLY2 are connected in parallel between the voltage input terminal IN and the voltage output terminal OUT, the third flying capacitor CFLY3 and the fourth flying capacitor CFLY4 are connected in series between the voltage input terminal IN and the ground, and the auxiliary flying capacitor CSFLY is not connected to the voltage conversion circuit 110. Then, the first voltage conversion circuit 111 can convert the input voltage Vin into the first output voltage Vout1, and Vout1 = 1.5Vin.

[0060] In the second phase, the first auxiliary switch QS1, the second auxiliary switch QS2, the second switching transistor Q2, the third switching transistor Q3, the fifth switching transistor Q5, the sixth switching transistor Q6, the eighth switching transistor Q8, the eleventh switching transistor Q11, and the fourteenth switching transistor Q14 are all turned off, and the first switching transistor Q1, the fourth switching transistor Q4, the seventh switching transistor Q7, the ninth switching transistor Q9, the tenth switching transistor Q10, the twelfth switching transistor Q12, and the thirteenth switching transistor Q13 are all turned on.

[0061] As Figure 5 shown in part (b) of the figure. In the second phase, the first flying capacitor CFLY1 and the second flying capacitor CFLY2 are connected in series between the voltage input terminal IN and the ground, the third flying capacitor CFLY3 and the fourth flying capacitor CFLY4 are connected in parallel between the voltage input terminal IN and the voltage output terminal OUT, and the auxiliary flying capacitor CSFLY is not connected to the voltage conversion circuit 110. Then, the second voltage conversion circuit 112 can convert the input voltage Vin into the first output voltage Vout1.

[0062] The second operating mode, such as the 4:5 operating mode, includes a third phase and a fourth phase, and the voltage conversion circuit 110 operates alternately in the third phase and the fourth phase. In the third phase, the second auxiliary switch QS2, the second switching transistor Q2, the third switching transistor Q3, the fifth switching transistor Q5, the sixth switching transistor Q6, the eighth switching transistor Q8, and the eleventh switching transistor Q11 are all turned on, and the first auxiliary switch QS1, the first switching transistor Q1, the fourth switching transistor Q4, the seventh switching transistor Q7, the ninth switching transistor Q9, the tenth switching transistor Q10, the twelfth switching transistor Q12, the thirteenth switching transistor Q13, and the fourteenth switching transistor Q14 are all turned off.

[0063] Figure 6 The equivalent circuit diagram of the multi-mode switched-capacitor voltage conversion circuit in the second operating mode provided by the embodiments of the present disclosure is shown in Figure 6 part (a) of FIG. In the third phase, the first flying capacitor CFLY1 and the second flying capacitor CFLY2 are connected in parallel between the voltage input terminal IN and the voltage output terminal OUT, and the third flying capacitor CFLY3, the fourth flying capacitor CFLY4, and the auxiliary flying capacitor CSFLY are connected in series between the voltage input terminal IN and the ground. Then, the first voltage conversion circuit 111 can convert the input voltage Vin into the second output voltage Vout2, and Vout2 = 1.25Vin.

[0064] In the fourth phase, the second auxiliary switch QS2, the second switching transistor Q2, the third switching transistor Q3, the fifth switching transistor Q5, the sixth switching transistor Q6, the seventh switching transistor Q7, the eighth switching transistor Q8, the eleventh switching transistor Q11, and the fourteenth switching transistor Q14 are all turned off, and the first auxiliary switch QS1, the first switching transistor Q1, the fourth switching transistor Q4, the ninth switching transistor Q9, the tenth switching transistor Q10, the twelfth switching transistor Q12, and the thirteenth switching transistor Q13 are all turned on.

[0065] As shown in Figure 6 part (b) of FIG. In the fourth phase, the first flying capacitor CFLY1 and the second flying capacitor CFLY2 are connected in series between the voltage input terminal IN and the first auxiliary node A, the auxiliary flying capacitor CSFLY is connected between the voltage input terminal IN and the first auxiliary node A, and the third flying capacitor CFLY3 and the fourth flying capacitor CFLY4 are connected in parallel between the voltage input terminal IN and the voltage output terminal OUT. Then, the second voltage conversion circuit 112 can convert the input voltage Vin into the second output voltage Vout2.

[0066] The third operating mode, such as the 1:1 operating mode, includes a fifth phase. In the fifth phase, the first switching transistor Q1, the second switching transistor Q2, the fourth switching transistor Q4, the fifth switching transistor Q5, the sixth switching transistor Q6, the eighth switching transistor Q8, the ninth switching transistor Q9, the eleventh switching transistor Q11, the twelfth switching transistor Q12, and the thirteenth switching transistor Q13 are all turned on, and the first auxiliary switch QS1, the second auxiliary switch QS2, the third switching transistor Q3, the seventh switching transistor Q7, the tenth switching transistor Q10, and the fourteenth switching transistor Q14 are all turned off.

[0067] In the fifth phase, the first flying capacitor CFLY1, the second flying capacitor CFLY2, the third flying capacitor CFLY3, the fourth flying capacitor CFLY4, and the auxiliary flying capacitor CSFLY are not connected to the voltage conversion circuit 110. Then, the voltage input terminal IN is directly connected to the voltage output terminal OUT. The first voltage conversion circuit 111 and the second voltage conversion circuit 112 can convert the input voltage Vin into the third output voltage Vout3, and Vout3 = Vin.

[0068] For example, Figure 7 is a schematic diagram of the output voltage of the multi-mode switched-capacitor voltage conversion circuit provided by the embodiments of the present disclosure. As Figure 7 shown, when the input voltage Vin changes from low to high, the multi-mode switched-capacitor voltage conversion circuit 100 can operate in the first operating mode, the second operating mode, and the third operating mode in sequence.

[0069] Assume that the required output voltage Vout is not less than 3.3V. When the input voltage Vin is less than 2.64V and greater than 2.2V, the multi-mode switched-capacitor voltage conversion circuit 100 operates in the first operating mode, and the multi-mode switched-capacitor voltage conversion circuit 100 outputs the first output voltage Vout1. Until the input voltage Vin rises to 2.64V, the multi-mode switched-capacitor voltage conversion circuit 100 switches from the first operating mode to the second operating mode, and the output voltage of the multi-mode switched-capacitor voltage conversion circuit 100 switches from 3.96V to 3.3V. Then, the change in the output voltage is 0.66V.

[0070] When the input voltage Vin is greater than 2.64V and less than 3.3V, the multi-mode switched-capacitor voltage conversion circuit 100 continuously operates in the second operating mode and continuously outputs the second output voltage Vout2. Until the input voltage Vin rises to 3.3V, the multi-mode switched-capacitor voltage conversion circuit 100 switches from the second operating mode to the third operating mode, and the output voltage of the multi-mode switched-capacitor voltage conversion circuit 100 switches from 4.125V to 3.3V. The change in the output voltage is 0.825V.

[0071] Thus, at the same input voltage Vin, the first output voltage Vout1 and the second output voltage Vout2 differ by 0.25*Vin, and the second output voltage Vout2 and the third output voltage Vout3 differ by 0.25*Vin. This can reduce the change in the output voltage to half of the change in the existing output voltage during the switching of the operating mode, thereby reducing the change in the output voltage, improving the stability of the output voltage, and enhancing the circuit stability.

[0072] In some embodiments, referring still to Figures 4 to 6 , the multi-mode switched-capacitor voltage conversion circuit 100 further includes an output capacitor COUT. The output capacitor COUT is connected between the voltage output terminal OUT and the ground. The output capacitor COUT can play a voltage stabilizing role to further improve the stability of the circuit.

[0073] The present disclosure also provides a voltage converter, including the multi-mode switched-capacitor voltage conversion circuit 100 provided in any of the above embodiments.

[0074] The voltage converter provided by the embodiments of the present disclosure includes the multi-mode switched-capacitor voltage conversion circuit 100 provided in any of the above embodiments, and has the same functional modules and beneficial effects as the multi-mode switched-capacitor voltage conversion circuit 100, which will not be elaborated here.

[0075] The present disclosure also provides a power supply chip, including the multi-mode switched-capacitor voltage conversion circuit 100 provided in any of the above embodiments.

[0076] The power supply chip provided by the embodiments of the present disclosure includes the multi-mode switched-capacitor voltage conversion circuit 100 provided in any of the above embodiments, and has the same functional modules and beneficial effects as the multi-mode switched-capacitor voltage conversion circuit 100, which will not be elaborated here.

[0077] Unless otherwise explicitly stated in the context, the singular forms of the words used in this specification and the appended claims include the plural, and vice versa. Thus, when referring to the singular, the plural of the corresponding term is generally included. Similarly, the terms "comprising" and "including" shall be interpreted as inclusive rather than exclusive. Likewise, the terms "including" and "or" shall be interpreted as inclusive, unless such an interpretation is explicitly prohibited herein. Where the term "example" is used in this specification, the "example" is merely exemplary and explanatory, and should not be considered exclusive or extensive.

[0078] The above has described several embodiments of the present disclosure in detail. However, obviously, those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. The protection scope of the present disclosure is defined by the appended claims.

Claims

1. A multi-mode switched-capacitor voltage conversion circuit, characterized in that Comprising: A voltage conversion circuit and an auxiliary circuit; The voltage conversion circuit is connected between a voltage input terminal and ground, an output terminal of the voltage conversion circuit is connected to a voltage output terminal, a first end of the auxiliary circuit is connected to a first auxiliary node of the voltage conversion circuit, a second end of the auxiliary circuit is connected to a second auxiliary node of the voltage conversion circuit, and a third end of the auxiliary circuit is grounded; The voltage conversion circuit is configured to convert an input voltage into a first output voltage in a first operating mode, cooperate with the auxiliary circuit to convert the input voltage into a second output voltage in a second operating mode, and convert the input voltage into a third output voltage in a third operating mode; Wherein, the first output voltage is greater than the second output voltage, and the second output voltage is greater than the third output voltage.

2. The multi-mode switched-capacitor voltage conversion circuit according to claim 1, wherein The auxiliary circuit includes an auxiliary flying capacitor, a first auxiliary switch, and a second auxiliary switch; A second electrode plate of the auxiliary flying capacitor is connected to the second auxiliary node, a first electrode plate of the auxiliary flying capacitor is connected to a first end of the first auxiliary switch and a first end of the second auxiliary switch, a second end of the first auxiliary switch is connected to the first auxiliary node, and a second end of the second auxiliary switch is grounded; In the first operating mode and the third operating mode, both the first auxiliary switch and the second auxiliary switch are turned off, and in the second operating mode, either the first auxiliary switch or the second auxiliary switch is turned on.

3. The multi-mode switched-capacitor voltage conversion circuit according to claim 2, wherein The voltage conversion circuit includes a first voltage conversion circuit and a second voltage conversion circuit; The first voltage conversion circuit and the second voltage conversion circuit are connected in parallel between the voltage input terminal and ground, an output terminal of the first voltage conversion circuit and an output terminal of the second voltage conversion circuit are connected to the voltage output terminal, the first auxiliary node of the first voltage conversion circuit is connected to the first end of the auxiliary circuit, and the second auxiliary node of the second voltage conversion circuit is connected to the second end of the auxiliary circuit; The first voltage conversion circuit is configured to convert the input voltage into the first output voltage in a first phase, cooperate with the auxiliary circuit to convert the input voltage into the second output voltage in a third phase, and convert the input voltage into the third output voltage in a fifth phase; The second voltage conversion circuit is configured to convert the input voltage into the first output voltage in a second phase, cooperate with the auxiliary circuit to convert the input voltage into the second output voltage in a fourth phase, and convert the input voltage into the third output voltage in the fifth phase; Wherein, the first operating mode includes the first phase and the second phase, the second operating mode includes the third phase and the fourth phase, and the third operating mode includes the fifth phase.

4. The multi-mode switched-capacitor voltage conversion circuit according to claim 3, wherein The first operating mode is a 2:3 operating mode, the second operating mode is a 4:5 operating mode, and the third operating mode is a 1:1 operating mode; The first voltage conversion circuit includes a first flying capacitor and a second flying capacitor; In the first phase and the third phase, the first flying capacitor and the second flying capacitor are connected in parallel between the voltage input terminal and the voltage output terminal. In the second phase, the first flying capacitor and the second flying capacitor are connected in series between the voltage input terminal and the ground. In the fourth phase, the first flying capacitor and the second flying capacitor are connected in series between the voltage input terminal and the first auxiliary node, and the auxiliary flying capacitor is connected between the voltage input terminal and the first auxiliary node; In the fifth phase, the first flying capacitor and the second flying capacitor are not connected.

5. The multi-mode switched-capacitor voltage conversion circuit according to claim 3, wherein, The first working mode is a 2:3 working mode, the second working mode is a 4:5 working mode, and the third working mode is a 1:1 working mode; The second voltage conversion circuit includes a third flying capacitor and a fourth flying capacitor; In the first phase, the third flying capacitor and the fourth flying capacitor are connected in series between the voltage input terminal and the ground. In the second phase and the fourth phase, the third flying capacitor and the fourth flying capacitor are connected in parallel between the voltage input terminal and the voltage output terminal. In the third phase, the third flying capacitor, the fourth flying capacitor, and the auxiliary flying capacitor are connected in series between the voltage input terminal and the ground; In the fifth phase, the third flying capacitor and the fourth flying capacitor are not connected.

6. The multi-mode switched-capacitor voltage conversion circuit according to claim 4, wherein The first voltage conversion circuit further includes a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, and a seventh switching tube; The first ends of the first switching tube, the second switching tube, and the third switching tube are connected to the voltage input terminal. The second end of the first switching tube is connected to the first end of the fifth switching tube and the first plate of the first flying capacitor. The second plate of the first flying capacitor is connected to the second end of the second switching tube and the first end of the fourth switching tube; The second end of the fourth switching tube is connected to the first plate of the second flying capacitor and the first end of the sixth switching tube. The second ends of the fifth switching tube and the sixth switching tube are connected to the voltage output terminal. The second plate of the second flying capacitor is connected to the second end of the third switching tube, the first end of the seventh switching tube, and the first auxiliary node, and the second end of the seventh switching tube is grounded.

7. The multi-mode switched-capacitor voltage conversion circuit according to claim 5, wherein The second voltage conversion circuit further includes an eighth switching tube, a ninth switching tube, a tenth switching tube, an eleventh switching tube, a twelfth switching tube, a thirteenth switching tube, and a fourteenth switching tube; The first ends of the eighth switching tube, the ninth switching tube, and the tenth switching tube are connected to the voltage input terminal. The second end of the eighth switching tube is connected to the first end of the twelfth switching tube and the first plate of the third flying capacitor. The second plate of the third flying capacitor is connected to the second end of the ninth switching tube and the first end of the eleventh switching tube; The second terminal of the eleventh switching transistor is connected to the first plate of the fourth flying capacitor and the first terminal of the thirteenth switching transistor. The second terminals of the twelfth switching transistor and the thirteenth switching transistor are connected to the voltage output terminal. The second plate of the fourth flying capacitor is connected to the second terminal of the tenth switching transistor, the first terminal of the fourteenth switching transistor, and the second auxiliary node. The second terminal of the fourteenth switching transistor is grounded.

8. The multi-mode switched-capacitor voltage conversion circuit according to any one of claims 1-7, characterized in that The multi-mode switched-capacitor voltage conversion circuit further includes an output capacitor, and the output capacitor is connected between the voltage output terminal and the ground.

9. A voltage converter, characterized in that, It includes the multi-mode switched-capacitor voltage conversion circuit according to any one of claims 1-8.

10. A power supply chip, characterized in that, It includes the multi-mode switched-capacitor voltage conversion circuit according to any one of claims 1-8.

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