Driving power supply circuit and Dickson switched capacitor voltage converter

Abstract

The invention provides a driving power supply circuit and a Dickson switched capacitor voltage converter. Under the condition that the Dickson switched capacitor voltage converter 1000 is a 3: 1 switched capacitor voltage converter, the first power supply circuit supplies power to the first driving circuit and the second driving circuit through the voltage on the bootstrap capacitor. The second power supply circuit supplies power to the third drive circuit and the fourth drive circuit through a clamping tube in the second power supply circuit by using the voltage on the first fly capacitor, so that the voltages at the two ends of the clamping tube in the second power supply circuit are equal, and the gate drive loss of a third power switch tube and a fourth power switch tube is reduced. And the application requirement of high conversion efficiency is met. Meanwhile, the number of the bootstrap capacitor is only one, so that the driving power supply circuit does not need to be additionally provided with a bootstrap capacitor and a pin, and the low-cost application requirement is met. Therefore, the Dickson switched capacitor voltage converter can give consideration to both high conversion efficiency and low cost.

Description

Technical Field

[0001] The present application relates to the technical field of power management chips, and in particular to a driving power supply circuit and a Dickson switched capacitor voltage converter. Background Art

[0002] As a basic power converter, switched capacitor voltage converters are widely used in various power management applications. They typically include capacitors and power switches. Switched capacitor voltage converters change the capacitor connection method by controlling the conduction timing of the power switches to achieve voltage or current conversion of varying ratios between the input and output of the switched capacitor voltage converter. To meet complex voltage or current conversion requirements, switched capacitor voltage converters employ a multi-stage architecture, with the Dickson architecture being a more commonly used topology. Dickson-based switched capacitor voltage converters are capable of achieving a wide variety of voltage or current conversion ratios.

[0003] Switched capacitor voltage converters are often used in mobile devices due to their advantages of miniaturization, low cost, and high conversion efficiency. Therefore, high conversion efficiency and low cost are important parameters for evaluating the performance of switched capacitor voltage converters. High conversion efficiency means less energy loss in the switched capacitor voltage converter, reducing unnecessary energy loss and heat dissipation, shortening charging time, and improving battery life. The energy loss of the switched capacitor voltage converter mainly comes from the conduction loss and gate drive loss of the power switch tube, as well as the equivalent series resistance (ESR) loss of the capacitor. Among them, the gate drive loss of the power switch tube is related to the drive power supply circuit corresponding to the power switch tube. In addition, low cost means that the chip area (die size) and chip peripheral components of the switched capacitor voltage converter need to be miniaturized.

[0004] In an operating mode where the conversion ratio between the input voltage and the output voltage of the Dickson switched capacitor voltage converter is 3:1, that is, when the Dickson switched capacitor voltage converter is a 3:1 switched capacitor voltage converter, the Dickson switched capacitor voltage converter currently uses two drive power supply circuits to power the drive circuit, so that the drive circuit can drive the power switch tube to be turned on or off to achieve voltage or current conversion.

[0005] Solution 1: The driver power supply circuit does not require an additional bootstrap capacitor to power the driver circuit, enabling the Dickson switched-capacitor voltage converter to meet low-cost application requirements. However, the driver power supply circuit generates additional power consumption, resulting in high gate drive losses in the power switch tube, making the Dickson switched-capacitor voltage converter unable to achieve high conversion efficiency application requirements.

[0006] Solution 2: The driver power supply circuit requires an additional bootstrap capacitor to supply power to the driver circuit, enabling the Dickson switched capacitor voltage converter to achieve high conversion efficiency. However, the additional bootstrap capacitor in the driver power supply circuit requires additional pins for the Dickson switched capacitor voltage converter, making it impossible to achieve low-cost applications.

[0007] In summary, the two aforementioned solutions fail to simultaneously meet the requirements of low power consumption for the driver power supply circuit and eliminate the need for additional bootstrap capacitors to power the driver circuit. This prevents the Dickson switched capacitor voltage converter from achieving both high conversion efficiency and reduced peripheral components. Consequently, the Dickson switched capacitor voltage converter fails to meet both high conversion efficiency and low cost requirements. Summary of the Invention

[0008] The present application provides a driving power supply circuit and a Dickson switched capacitor voltage converter. The driving power supply circuit does not generate additional power consumption and does not require an additional bootstrap capacitor to supply power to the driving circuit, so that the Dickson switched capacitor voltage converter can meet the application requirements of high conversion efficiency and low cost.

[0009] In a first aspect, the present application provides a drive power supply circuit, which is applied to a Dickson switched capacitor voltage converter. The Dickson switched capacitor voltage converter includes: a first charge and discharge circuit and a second charge and discharge circuit, wherein the first end of the first charge and discharge circuit and the first end of the second charge and discharge circuit are both electrically connected to the input end of the Dickson switched capacitor voltage converter, and the second end of the first charge and discharge circuit and the second end of the second charge and discharge circuit are both electrically connected to the output end of the Dickson switched capacitor voltage converter, and the first charge and discharge circuit and the second charge and discharge circuit are connected in parallel; the first charge and discharge circuit and the second charge and discharge circuit each include: a first power switch tube, a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, a first flying capacitor and a second flying capacitor;

[0010] In the case where the Dickson switched capacitor voltage converter is a 3:1 switched capacitor voltage converter, the driving power supply circuit includes: a first power supply circuit and a second power supply circuit, and the number of the bootstrap capacitor in the driving power supply circuit is one;

[0011] An input end of the first power supply circuit is electrically connected to an input end of the Dickson switched capacitor voltage converter, a first output end of the first power supply circuit is electrically connected to a power supply end of a first drive circuit of the first power switch tube, a first ground end of the first power supply circuit and a ground end of the first drive circuit are both electrically connected to a source end of the first power switch tube, a second output end of the first power supply circuit is electrically connected to a power supply end of a second drive circuit of the second power switch tube, and a second ground end of the second power supply circuit and a ground end of the second drive circuit are both electrically connected to a source end of the second power switch tube;

[0012] An input terminal of the second power supply circuit is electrically connected to the upper plate of the first flying capacitor, a first output terminal of the second power supply circuit is electrically connected to the power terminal of the third drive circuit of the third power switch tube, a first ground terminal of the second power supply circuit and a ground terminal of the third drive circuit are both electrically connected to the source terminal of the third power switch tube, a second output terminal of the second power supply circuit is electrically connected to the power terminal of the fourth drive circuit of the fourth power switch tube, and a second ground terminal of the second power supply circuit and a ground terminal of the fourth drive circuit are both electrically connected to the source terminal of the fourth power switch tube. When the third power switch tube is the third power switch tube in the first charge-discharge circuit, the first flying capacitor is the first flying capacitor in the second charge-discharge circuit, or when the third power switch tube is the third power switch tube in the second charge-discharge circuit, the first flying capacitor is the first flying capacitor in the first charge-discharge circuit.

[0013] The power supply terminal of the fifth drive circuit of the fifth power switch tube and the power supply terminal of the seventh drive circuit of the seventh power switch tube are both electrically connected to the output terminal of the Dickson switched capacitor voltage converter, the ground terminal of the fifth drive circuit and the ground terminal of the seventh drive circuit are both grounded, the power supply terminal of the sixth drive circuit of the sixth power switch tube is electrically connected to the upper plate of the second flying capacitor, and the ground terminal of the sixth drive circuit is electrically connected to the source terminal of the sixth power switch tube; wherein, when the sixth power switch tube is the sixth power switch tube in the first charge and discharge circuit, the second flying capacitor is the second flying capacitor in the first charge and discharge circuit, or when the sixth power switch tube is the sixth power switch tube in the second charge and discharge circuit, the second flying capacitor is the second flying capacitor in the second charge and discharge circuit;

[0014] The first power supply circuit is configured to supply power to the first drive circuit and the second drive circuit respectively using the voltage on the bootstrap capacitor;

[0015] The second power supply circuit is used to use the voltage on the first flying capacitor to supply power to the third drive circuit and the fourth drive circuit respectively through the clamping tube in the second power supply circuit, so that the first terminal voltage and the second terminal voltage of the clamping tube in the second power supply circuit are equal.

[0016] With the drive power supply circuit provided in the first aspect, when the Dickson switched capacitor voltage converter 1000 is a 3:1 switched capacitor voltage converter, the first power supply circuit can utilize the voltage on the bootstrap capacitor to respectively power the first and second drive circuits. The second power supply circuit can utilize the voltage on the first fly capacitor to respectively power the third and fourth drive circuits via the clamp transistor in the second power supply circuit, thereby making the first terminal voltage and the second terminal voltage of the clamp transistor in the second power supply circuit equal, thereby reducing the gate drive loss of the third and fourth power switches, thereby reducing the loss of the Dickson switched capacitor voltage converter and achieving high conversion efficiency application requirements. Furthermore, because the drive power supply circuit has only one bootstrap capacitor, the drive power supply circuit can utilize the first fly capacitor to power the third and fourth drive circuits without the need for additional bootstrap capacitors and pins, enabling the Dickson switched capacitor voltage converter to achieve low-cost application requirements. Thus, the Dickson switched capacitor voltage converter can achieve both high conversion efficiency and low-cost application requirements.

[0017] In one possible design, the second power supply circuit includes: a first clamping tube, a first clamping tube driving circuit, a second clamping tube, and a second clamping tube driving circuit;

[0018] The first end of the first clamping transistor is electrically connected to the upper plate of the first flying capacitor, the second end of the first clamping transistor is electrically connected to the power supply terminal of the third driving circuit and the first end of the second clamping transistor respectively, the control end of the first clamping transistor is electrically connected to the output end of the first clamping transistor driving circuit, the input end of the first clamping transistor driving circuit and the input end of the second clamping transistor driving circuit are both electrically connected to a first voltage, the ground end of the first clamping transistor driving circuit is electrically connected to the ground end of the third driving circuit, the second end of the second clamping transistor is electrically connected to the power supply terminal of the fourth driving circuit, the control end of the second clamping transistor is electrically connected to the output end of the second clamping transistor driving circuit, and the ground end of the second clamping transistor driving circuit is electrically connected to the ground end of the fourth driving circuit;

[0019] The first clamping tube driving circuit is configured to control the first clamping tube to be turned on based on the first voltage, so that the voltage on the first flying capacitor supplies power to the third driving circuit;

[0020] The second clamping tube driving circuit is used to control the second clamping tube to be turned on based on the first voltage, so that the voltage on the first flying capacitor supplies power to the fourth driving circuit.

[0021] In a possible design, the first clamping transistor includes: a first N-type field effect transistor and a second N-type field effect transistor, and the second clamping transistor is a third N-type field effect transistor;

[0022] The drain terminal of the first N-type field effect transistor is electrically connected to the upper plate of the first flying capacitor, the source terminal of the first N-type field effect transistor is electrically connected to the source terminal of the second N-type field effect transistor, the drain terminal of the second N-type field effect transistor is electrically connected to the power supply terminal of the third driving circuit and the drain terminal of the third N-type field effect transistor, respectively, the gate terminal of the first N-type field effect transistor and the gate terminal of the second N-type field effect transistor are both electrically connected to the output terminal of the first clamping tube driving circuit, the gate terminal of the third N-type field effect transistor is electrically connected to the output terminal of the second clamping tube driving circuit, and the source terminal of the third N-type field effect transistor is electrically connected to the power supply terminal of the fourth driving circuit.

[0023] In one possible design, the first clamping tube driving circuit includes: a first current source, a first Zener diode, and a first capacitor;

[0024] The input end of the first current source is electrically connected to the first voltage, the output end of the first current source is electrically connected to the cathode of the first Zener diode, the upper plate of the first capacitor and the control end of the first clamping tube, and the anode of the first Zener diode and the lower plate of the first capacitor are both electrically connected to the ground end of the third driving circuit.

[0025] In one possible design, the second clamping tube driving circuit includes: a first current source, a first Zener diode, and a first capacitor;

[0026] The input end of the first current source is electrically connected to the first voltage, the output end of the first current source is electrically connected to the cathode of the first Zener diode, the upper plate of the first capacitor and the control end of the second clamping tube respectively, and the anode of the first Zener diode and the lower plate of the first capacitor are both electrically connected to the ground end of the fourth driving circuit.

[0027] In one possible design, the first power supply circuit includes: a fourth N-type field effect transistor, a field effect transistor driving circuit, a first P-type field effect transistor, a third clamping transistor, a third clamping transistor driving circuit, and the bootstrap capacitor;

[0028] The drain terminal of the fourth N-type field effect transistor is electrically connected to the input terminal of the Dickson switched capacitor voltage converter, the gate terminal of the fourth N-type field effect transistor is electrically connected to the output terminal of the field effect transistor driving circuit, the source terminal of the fourth N-type field effect transistor is electrically connected to the source terminal of the first P-type field effect transistor, the gate terminal of the first P-type field effect transistor is used to receive a control signal, the drain terminal of the first P-type field effect transistor is electrically connected to the upper plate of the bootstrap capacitor, the power supply terminal of the first driving circuit, and the first terminal of the third clamping transistor, respectively. The input terminal of the field effect transistor driving circuit and the input terminal of the third clamping transistor driving circuit are both electrically connected to a first voltage. The ground terminal of the field effect transistor driving circuit and the lower plate of the bootstrap capacitor are both electrically connected to the ground terminal of the first driving circuit. The second terminal of the third clamping transistor is electrically connected to the power supply terminal of the second driving circuit. The control terminal of the third clamping transistor is electrically connected to the output terminal of the third clamping transistor driving circuit. The ground terminal of the third clamping transistor driving circuit is electrically connected to the ground terminal of the second driving circuit.

[0029] The field effect transistor driving circuit is configured to control the fourth N-type field effect transistor to be turned on based on the first voltage;

[0030] the first P-type field effect transistor is configured to be turned on or off according to the control signal when the fourth N-type field effect transistor is turned on, so that the voltage on the bootstrap capacitor supplies power to the first driving circuit;

[0031] The third clamping tube driving circuit is used to control the third clamping tube to be turned on based on the first voltage, so that the voltage on the bootstrap capacitor supplies power to the second driving circuit.

[0032] In one possible design, the field effect transistor driving circuit includes: a second current source, a second Zener diode, and a second capacitor;

[0033] The input end of the second current source is electrically connected to the first voltage, the output end of the second current source is electrically connected to the negative electrode of the second Zener diode, the upper plate of the second capacitor and the gate end of the fourth N-type field effect transistor, and the positive electrode of the second Zener diode and the lower plate of the second capacitor are both electrically connected to the ground end of the first drive circuit.

[0034] In one possible design, the third clamping tube driving circuit includes: a second current source, a second Zener diode, and a second capacitor;

[0035] The input end of the second current source is electrically connected to the first voltage, the output end of the second current source is electrically connected to the cathode of the second Zener diode, the upper plate of the second capacitor and the control end of the third clamping tube respectively, and the anode of the second Zener diode and the lower plate of the second capacitor are both electrically connected to the ground end of the second driving circuit.

[0036] In one possible design, when the Dickson switched capacitor voltage converter is a 2:1 switched capacitor voltage converter, the driving power supply circuit further includes: a third power supply circuit;

[0037] The input end of the third power supply circuit is electrically connected to the first output end of the first power supply circuit, and the output end of the third power supply circuit is electrically connected to the power supply end of the third driving circuit;

[0038] The first power supply circuit is configured to supply power to the first drive circuit and the second drive circuit respectively using the voltage on the bootstrap capacitor;

[0039] The third power supply circuit is used to utilize the voltage on the bootstrap capacitor to supply power to the third drive circuit and the fourth drive circuit respectively through the clamping tube in the third power supply circuit.

[0040] In one possible design, when the Dickson switched capacitor voltage converter is a 1:1 switched capacitor voltage converter, the driving power supply circuit further includes: a fourth power supply circuit;

[0041] The input end of the fourth power supply circuit is electrically connected to the first voltage, and the output end of the fourth power supply circuit is electrically connected to the power supply end of the first drive circuit;

[0042] The fourth power supply circuit is configured to use the first voltage to charge the bootstrap capacitor via a clamping transistor in the fourth power supply circuit, so that the voltage on the bootstrap capacitor supplies power to the first drive circuit and the second drive circuit respectively;

[0043] The third power supply circuit is used to utilize the voltage on the bootstrap capacitor to supply power to the third drive circuit and the fourth drive circuit respectively through the clamping tube in the third power supply circuit.

[0044] In a second aspect, the present application provides a Dickson switched capacitor voltage converter, the Dickson switched capacitor voltage converter comprising: a first charge and discharge circuit, a second charge and discharge circuit, and the driving power supply circuit in the first aspect and any possible design of the first aspect;

[0045] The first end of the first charge-discharge circuit and the first end of the second charge-discharge circuit are both electrically connected to the input end of the Dickson switched capacitor voltage converter, the second end of the first charge-discharge circuit and the second end of the second charge-discharge circuit are both electrically connected to the output end of the Dickson switched capacitor voltage converter, and the first charge-discharge circuit and the second charge-discharge circuit are connected in parallel;

[0046] The first charge and discharge circuit and the second charge and discharge circuit each include: a first power switch tube, a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, a first flying capacitor, a second flying capacitor, a first drive circuit, a second drive circuit, a third drive circuit, a fourth drive circuit, a fifth drive circuit, a sixth drive circuit, and a seventh drive circuit;

[0047] The drain terminal of the first power switch tube is electrically connected to the input terminal of the Dickson switched capacitor voltage converter, the gate terminal of the first power switch tube is electrically connected to the first drive circuit, the source terminal of the first power switch tube is electrically connected to the drain terminal of the second power switch tube, the gate terminal of the second power switch tube is electrically connected to the second drive circuit, the source terminal of the second power switch tube is electrically connected to the drain terminal of the third power switch tube, the gate terminal of the third power switch tube is electrically connected to the third drive circuit, the source terminal of the third power switch tube is electrically connected to the drain terminal of the fourth power switch tube and the gate terminal of the third power switch tube, respectively. The drain terminal of the sixth power switch tube is electrically connected, the gate terminal of the fourth power switch tube is electrically connected to the fourth drive circuit, the source terminal of the fourth power switch tube is electrically connected to the drain terminal of the fifth power switch tube, the gate terminal of the fifth power switch tube is electrically connected to the fifth drive circuit, the gate terminal of the sixth power switch tube is electrically connected to the sixth drive circuit, the gate terminal of the seventh power switch tube is electrically connected to the seventh drive circuit, the source terminal of the sixth power switch tube is electrically connected to the drain terminal of the seventh power switch tube, and the source terminal of the fifth power switch tube and the source terminal of the seventh power switch tube are both grounded;

[0048] The upper plate of the first flying capacitor is electrically connected between the source terminal of the first power switch tube and the drain terminal of the second power switch tube, the lower plate of the first flying capacitor is electrically connected between the source terminal of the fourth power switch tube and the drain terminal of the fifth power switch tube, the upper plate of the second flying capacitor is electrically connected between the source terminal of the second power switch tube and the drain terminal of the third power switch tube, and the lower plate of the second flying capacitor is electrically connected between the source terminal of the sixth power switch tube and the drain terminal of the seventh power switch tube;

[0049] The power supply terminals of the first drive circuit, the second drive circuit, the third drive circuit, and the fourth drive circuit are all electrically connected to the output terminal of the drive power supply circuit. The power supply terminals of the fifth drive circuit and the seventh drive circuit are both electrically connected to the output terminal of the Dickson switched capacitor voltage converter. The power supply terminal of the sixth drive circuit is electrically connected to the upper plate of the second flying capacitor. The ground terminal of the first drive circuit is electrically connected to the source terminal of the first power switch tube, the ground terminal of the second drive circuit is electrically connected to the source terminal of the second power switch tube, the ground terminal of the third drive circuit is electrically connected to the source terminal of the third power switch tube, the ground terminal of the fourth drive circuit is electrically connected to the source terminal of the fourth power switch tube, the ground terminal of the fifth drive circuit is electrically connected to the source terminal of the fifth power switch tube, the ground terminal of the sixth drive circuit is electrically connected to the source terminal of the sixth power switch tube, and the ground terminal of the seventh drive circuit is electrically connected to the source terminal of the seventh power switch tube.

[0050] The beneficial effects of the Dickson switched capacitor voltage converter provided in the second aspect and each possible design of the second aspect can be referred to the beneficial effects brought about by the first aspect and each possible implementation method of the first aspect, and will not be repeated here.

[0051] In a third aspect, the present application provides a chip, comprising: the driving power supply circuit in the above-mentioned first aspect and any possible design of the first aspect, or the Dickson switched capacitor voltage converter in the above-mentioned second aspect.

[0052] In a fourth aspect, the present application provides an electronic device, comprising: the chip in the above-mentioned third aspect and any possible design of the third aspect.

[0053] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the embodiments of the present application, they can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0055] Figure 1 Schematic diagram of the structure of a Dickson switched capacitor voltage converter in a 3:1 operating mode in the related art;

[0056] Figure 2 for Figure 1 Schematic diagram of the driving power supply circuit of the Dickson switched capacitor voltage converter in the 3:1 working mode;

[0057] Figure 3 for Figure 1 Schematic diagram of the drive power supply circuit of the second scheme of the Dickson switched capacitor voltage converter in the 3:1 working mode;

[0058] Figure 4 A schematic diagram of the structure of a Dickson switched capacitor voltage converter provided in one embodiment of the present application. DETAILED DESCRIPTION

[0059] 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.

[0060] 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.

[0061] 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.

[0062] Reference Figure 1 , Figure 1 FIG. 1 is a schematic diagram of the structure of a Dickson switched capacitor voltage converter in a 3:1 working mode in the related art. Figure 1 As shown, the Dickson switched capacitor voltage converter in the related art transfers charge from the input terminal PMID0 to the output terminal through power switch tubes Q1A, Q2A, Q3A, Q4A, Q5A, Q6A, Q7A, Q1B, Q2B, Q3B, Q4B, Q5B, Q6B, Q7B, capacitors CF1A, CF2A, CF1B, and CF2B, enabling the Dickson switched capacitor voltage converter to achieve a 3:1 voltage conversion or current conversion, i.e., output voltage VOUT0 = VIN0 / 3, and output current IOUT0 = 3*IIN0. Where VIN0 is the input voltage and IIN0 is the input current.

[0063] Reference Figure 2 , Figure 2 for Figure 1 The schematic diagram of the driving power supply circuit of the Dickson switched capacitor voltage converter in the 3:1 working mode. Figure 2 As shown, the driving power supply circuit in the first solution may include: bootstrap capacitor CBST1A, bootstrap capacitor CBST1A, field effect transistor p1A, field effect transistor p1B, field effect transistor n2A, field effect transistor n2B, field effect transistor n3A, field effect transistor n3B and field effect transistor n4A, field effect transistor n4B.

[0064] When power switch Q1A or Q1B is on, the drive circuit of power switch Q1A is powered by bootstrap capacitor CBST1A, and the drive circuit of power switch Q1B is powered by bootstrap capacitor CBST1B. When power switch Q1A or Q1B is off, the input terminal PMID0 of the Dickson switched capacitor voltage converter charges bootstrap capacitor CBST1A through field-effect transistor p1A, and the input terminal PMID0 of the Dickson switched capacitor voltage converter charges bootstrap capacitor CBST1B through field-effect transistor p1B.

[0065] The drive circuit of power switch Q2A is powered by voltage VBST1A on bootstrap capacitor CBST1A via the clamping of field-effect transistor n2A. The drive circuit of power switch Q2B is powered by voltage VBST1B on bootstrap capacitor CBST1B via the clamping of field-effect transistor n2B. The drive circuit of power switch Q3A is powered by voltage VBST1A on bootstrap capacitor CBST1A via the clamping of field-effect transistor n3A. The drive circuit of power switch Q3B is powered by voltage VBST1B on bootstrap capacitor CBST1B via the clamping of field-effect transistor n3B. The drive circuit of power switch Q4A is powered by voltage VBST1A on bootstrap capacitor CBST1A via the clamping of field-effect transistor n4A. The drive circuit of power switch Q4B is powered by voltage VBST1B on bootstrap capacitor CBST1B via the clamping of field-effect transistor n4B.

[0066] The driving circuit of the power switch tube Q6A is powered by capacitor CF2A, and the driving circuit of the power switch tube Q6B is powered by capacitor CF2B.

[0067] The driving circuit of the power switch tube Q5A, the driving circuit of the power switch tube Q5B, the driving circuit of the power switch tube Q7A, and the driving circuit of the power switch tube Q7B are all powered by the output voltage VOUT0 of the Dickson switched capacitor voltage converter.

[0068] For example, when the input voltage VIN0 of the Dickson switched capacitor voltage converter is 15V and the output voltage VOUT0 is 5V, there is a 10V voltage drop across the voltages of FET n3A, FET n3B, FET Mn4A, and FET n4B, and the current flowing through FET n3A needs to charge the drive circuit of the power switch Q3A, the current flowing through FET n3B needs to charge the drive circuit of the power switch Q3B, the current flowing through FET n4A needs to charge the drive circuit of the power switch Q4A, and the current flowing through FET n4B needs to power the drive circuit of the power switch Q4B. As a result, when power switches Q3A, Q3B, Q4A, and Q4B are on or off, the transient currents flowing through FETs n3A, n3B, n4A, and n4B are very large. This causes the voltage drops across FETs n3A, n3B, n4A, and n4B to generate significant additional power consumption, leading to significant gate drive losses for power switches Q3A, Q3B, Q4A, and Q4B. Consequently, the Dickson switched-capacitor voltage converter cannot achieve high conversion efficiency in applications requiring it.

[0069] Reference Figure 3 , Figure 3 for Figure 1 The schematic diagram of the driving power supply circuit of the second scheme of the Dickson switched capacitor voltage converter in the 3:1 working mode. Figure 3 As shown, the driving power supply circuit in the second scheme may include: bootstrap capacitor CBST1A, bootstrap capacitor CBST1A, bootstrap capacitor CBST2, field effect transistor p1A, field effect transistor p1B, field effect transistor n2A, field effect transistor n2B, field effect transistor n3A, field effect transistor n3B and field effect transistor n4A, field effect transistor n4B.

[0070] When power switch Q1A or Q1B is on, the drive circuit of power switch Q1A is powered by bootstrap capacitor CBST1A, and the drive circuit of power switch Q1B is powered by bootstrap capacitor CBST1B. When power switch Q1A or Q1B is off, the input terminal PMID0 of the Dickson switched capacitor voltage converter charges bootstrap capacitor CBST1A through field-effect transistor p1A, and the input terminal PMID0 of the Dickson switched capacitor voltage converter charges bootstrap capacitor CBST1B through field-effect transistor p1B.

[0071] The drive circuit of power switch Q2A is powered by voltage VBST1A on bootstrap capacitor CBST1A through the clamp of field effect transistor n2A. The drive circuit of power switch Q2B is powered by voltage VBST1B on bootstrap capacitor CBST1B through the clamp of field effect transistor n2B.

[0072] When power switch Q3A or Q3B is on, the drive circuit of power switch Q3A is powered by bootstrap capacitor CBST3, while the drive circuit of power switch Q3B is powered by bootstrap capacitor CBST2. When power switch Q3A or Q3B is off, capacitor CF2A charges bootstrap capacitor CBST2 through field-effect transistor n3A, while capacitor CF2B charges bootstrap capacitor CBST2 through field-effect transistor n3B.

[0073] The drive circuit of power switch Q4A is powered by the voltage VBST2 on bootstrap capacitor CBST2 through the clamp of field effect transistor n4A. The drive circuit of power switch Q4B is powered by the voltage VBST2 on bootstrap capacitor CBST2 through the clamp of field effect transistor n4B.

[0074] The driving circuit of the power switch tube Q6A is powered by capacitor CF2A, and the driving circuit of the power switch tube Q6B is powered by capacitor CF2B.

[0075] The driving circuit of the power switch tube Q5A, the driving circuit of the power switch tube Q5B, the driving circuit of the power switch tube Q7A, and the driving circuit of the power switch tube Q7B are all powered by the output voltage VOUT0 of the Dickson switched capacitor voltage converter.

[0076] For example, when the input voltage VIN0 of the Dickson switched capacitor voltage converter is 15V and the output voltage VOUT0 is 5V, the drive circuits of FETs n3A and n4A are both powered by capacitor CF2A via the added bootstrap capacitor CBST2, while the drive circuits of FETs n3B and n4B are both powered by capacitor CF2B via the added bootstrap capacitor CBST2. This eliminates voltage drops across FETs n3A, n3B, Mn4A, and n4B, reducing gate drive losses of power switches Q3A, Q3B, Q4A, and Q4B, enabling the Dickson switched capacitor voltage converter to achieve high conversion efficiency. However, the added bootstrap capacitor CBST2 requires additional pins for the Dickson switched capacitor voltage converter, making it difficult to achieve low-cost applications.

[0077] exist Figure 2 and Figure 3 In the figure, CF1HA represents the top plate voltage of capacitor CF1A, CF1LA represents the bottom plate voltage of capacitor CF1A. CF1HB represents the top plate voltage of capacitor CF1B, and CF1LB represents the bottom plate voltage of capacitor CF1B. CF2HA represents the top plate voltage of capacitor CF2A, CF2LA represents the bottom plate voltage of capacitor CF2A. CF2HB represents the top plate voltage of capacitor CF2B, and CF2LB represents the bottom plate voltage of capacitor CF2B.

[0078] FET clamping refers to limiting the gate voltage of a FET under specific conditions by applying a certain voltage to the gate. For example, when the gate voltage of FET n4A exceeds the breakdown voltage of the Zener diode connected to the gate of FET n4A, the Zener diode conducts, thereby limiting the gate voltage of FET n4A.

[0079] In summary, the two aforementioned solutions fail to simultaneously meet the requirements of low power consumption for the driver power supply circuit and eliminate the need for additional bootstrap capacitors to power the driver circuit. This prevents the Dickson switched capacitor voltage converter from achieving both high conversion efficiency and reduced peripheral components. Consequently, the Dickson switched capacitor voltage converter fails to meet both high conversion efficiency and low cost requirements.

[0080] To solve the above problems, the present application provides a driving power supply circuit, a Dickson switched capacitor voltage converter, a chip and an electronic device.

[0081] In this application, electronic devices may include but are not limited to: smartphones, tablet computers, and wireless headphones.

[0082] The driving power supply circuit and the Dickson switched capacitor voltage converter may be chips or circuit modules, which are not specifically limited in the embodiments of the present application.

[0083] Among them, the driving power supply circuit and other circuits or modules in the Dickson switched capacitor voltage converter except the driving power supply circuit can be integrated into the same chip or integrated into different chips, and the embodiments of the present application do not specifically limit this.

[0084] Reference Figure 4 , Figure 4 This is a schematic diagram of the structure of a Dickson switched capacitor voltage converter provided in one embodiment of the present application. Figure 4 As shown, the Dickson switched capacitor voltage converter 1000 may include: a first charge and discharge circuit 210 , a second charge and discharge circuit 220 and a driving power supply circuit.

[0085] The first end of the first charge and discharge circuit 210 and the first end of the second charge and discharge circuit 220 are both electrically connected to the input end PMID1 of the Dickson switched capacitor voltage converter 1000, and the second end of the first charge and discharge circuit 210 and the second end of the second charge and discharge circuit 220 are both electrically connected to the output end of the Dickson switched capacitor voltage converter 1000. The first charge and discharge circuit 210 and the second charge and discharge circuit 220 are connected in parallel.

[0086] The first charge and discharge circuit 210 and the second charge and discharge circuit 220 may each include: a first power switch tube K1, a second power switch tube K2, a third power switch tube K3, a fourth power switch tube K4, a fifth power switch tube K5, a sixth power switch tube K6, a seventh power switch tube K7, a first flying capacitor CFLY1, a second flying capacitor CFLY2, a first drive circuit D1, a second drive circuit D2, a third drive circuit D3, a fourth drive circuit D4, a fifth drive circuit D5, a sixth drive circuit D6 and a seventh drive circuit D7.

[0087] The drain terminal of the first power switch tube K1 is electrically connected to the input terminal PMID1 of the Dickson switched capacitor voltage converter 1000. The gate terminal of the first power switch tube K1 is electrically connected to the first drive circuit D1. The source terminal of the first power switch tube K1 is electrically connected to the drain terminal of the second power switch tube K2. The gate terminal of the second power switch tube K2 is electrically connected to the second drive circuit D2. The source terminal of the second power switch tube K2 is electrically connected to the drain terminal of the third power switch tube K3. The gate terminal of the third power switch tube K3 is electrically connected to the third drive circuit D3. The source terminal of the third power switch tube K3 is electrically connected to the drain terminal of the fourth power switch tube K4. The gate terminal of the fourth power switch tube K4 is electrically connected to the fourth drive circuit D4, the source terminal of the fourth power switch tube K4 is electrically connected to the drain terminal of the fifth power switch tube K5, the gate terminal of the fifth power switch tube K5 is electrically connected to the fifth drive circuit D5, the gate terminal of the sixth power switch tube K6 is electrically connected to the sixth drive circuit D6, the gate terminal of the seventh power switch tube K7 is electrically connected to the seventh drive circuit D7, the source terminal of the sixth power switch tube K6 is electrically connected to the drain terminal of the seventh power switch tube K7, and the source terminal of the fifth power switch tube K5 and the source terminal of the seventh power switch tube K7 are both grounded.

[0088] The upper plate of the first flying capacitor CFLY1 is electrically connected between the source terminal of the first power switch tube K1 and the drain terminal of the second power switch tube K2, the lower plate of the first flying capacitor CFLY1 is electrically connected between the source terminal of the fourth power switch tube K4 and the drain terminal of the fifth power switch tube K5, the upper plate of the second flying capacitor CFLY2 is electrically connected between the source terminal of the second power switch tube K2 and the drain terminal of the third power switch tube K3, and the lower plate of the second flying capacitor CFLY2 is electrically connected between the source terminal of the sixth power switch tube K6 and the drain terminal of the seventh power switch tube K7.

[0089] The power supply terminals of the first drive circuit D1, the second drive circuit D2, the third drive circuit D3, and the fourth drive circuit D4 are all electrically connected to the output terminal of the drive power supply circuit. The power supply terminals of the fifth drive circuit D5 and the seventh drive circuit D7 are all electrically connected to the output terminal of the Dickson switched capacitor voltage converter 1000. The power supply terminal of the sixth drive circuit D6 is electrically connected to the upper plate of the second flying capacitor CFLY2. The ground terminal of the first drive circuit D1 is electrically connected to the source terminal of the first power switch tube K1. The ground terminal of the first drive circuit D2 is electrically connected to the source terminal of the second power switch tube K2, the ground terminal of the third drive circuit D3 is electrically connected to the source terminal of the third power switch tube K3, the ground terminal of the fourth drive circuit D4 is electrically connected to the source terminal of the fourth power switch tube K4, the ground terminal of the fifth drive circuit D5 is electrically connected to the source terminal of the fifth power switch tube K5, the ground terminal of the sixth drive circuit D6 is electrically connected to the source terminal of the sixth power switch tube K6, and the ground terminal of the seventh drive circuit D7 is electrically connected to the source terminal of the seventh power switch tube K7.

[0090] In the first charge-discharge circuit 210, the first power switch tube is represented by K1A, the second power switch tube is represented by K2A, the third power switch tube is represented by K3A, the fourth power switch tube is represented by K4A, the fifth power switch tube is represented by K5A, the sixth power switch tube is represented by K6A, and the seventh power switch tube is represented by K7A. The first flying capacitor is represented by CFLY1A, the second flying capacitor is represented by CFLY2A, the first drive circuit is represented by D1A, the second drive circuit is represented by D2A, the third drive circuit is represented by D3A, the fourth drive circuit is represented by D4A, the fifth drive circuit is represented by D5A, the sixth drive circuit is represented by D6A, and the seventh drive circuit is represented by D7A.

[0091] In the second charge-discharge circuit 220, the first power switch tube is represented by K1B, the second power switch tube is represented by K2B, the third power switch tube is represented by K3B, the fourth power switch tube is represented by K4B, the fifth power switch tube is represented by K5B, the sixth power switch tube is represented by K6B, and the seventh power switch tube is represented by K7B. The first flying capacitor is represented by CFLY1B, the second flying capacitor is represented by CFLY2B, the first drive circuit is represented by D1B, the second drive circuit is represented by D2B, the third drive circuit is represented by D3B, the fourth drive circuit is represented by D4B, the fifth drive circuit is represented by D5B, the sixth drive circuit is represented by D6B, and the seventh drive circuit is represented by D7B.

[0092] Figure 4 In the figure, C1PA represents the upper plate voltage of the first flying capacitor CFLY1A, C1LA represents the lower plate voltage of the first flying capacitor CFLY1A. C1PB represents the upper plate voltage of the first flying capacitor CFLY1B, and C1LB represents the lower plate voltage of the first flying capacitor CFLY1B. C2PA represents the upper plate voltage of the second flying capacitor CFLY2A, C2LA represents the lower plate voltage of the second flying capacitor CFLY2A. C2PB represents the upper plate voltage of the second flying capacitor CFLY2B, and C2LB represents the lower plate voltage of the second flying capacitor CFLY2B.

[0093] Figure 4 The Dickson switched capacitor voltage converter shown has two operating phases (Phase 1 and Phase 2) in a 3:1 operating mode, and Phase 1 and Phase 2 are executed alternately.

[0094] In Phase 1, the first power switch tube K1A, the third power switch tube K3A, the fourth power switch tube K4A, and the seventh power switch tube K7A in the first charge and discharge circuit 210, and the second power switch tube K2B, the fifth power switch tube K5B, and the sixth power switch tube K6B in the second charge and discharge circuit 220 are simultaneously turned on. The second power switch tube K2A, the fifth power switch tube K5A, and the sixth power switch tube K6A in the first charge and discharge circuit 210, and the first power switch tube K1B, the third power switch tube K3B, the fourth power switch tube K4B, and the seventh power switch tube K7B in the second charge and discharge circuit 220 are simultaneously turned off.

[0095] In Phase 2, the first power switch tube K1A, the third power switch tube K3A, the fourth power switch tube K4A, and the seventh power switch tube K7A in the first charge and discharge circuit 210, and the second power switch tube K2B, the fifth power switch tube K5B, and the sixth power switch tube K6B in the second charge and discharge circuit 220 are simultaneously turned off. The second power switch tube K2A, the fifth power switch tube K5A, and the sixth power switch tube K6A in the first charge and discharge circuit 210, and the first power switch tube K1B, the third power switch tube K3B, the fourth power switch tube K4B, and the seventh power switch tube K7B in the second charge and discharge circuit 220 are simultaneously turned on.

[0096] The following combination Figure 4 , the driving power supply circuit provided in the embodiment of the present application is described in detail. Figure 4 As shown, when the Dickson switched capacitor voltage converter 1000 is a 3:1 switched capacitor voltage converter, the driving power supply circuit may include: a first power supply circuit 110 and a second power supply circuit 120 .

[0097] The number of the bootstrap capacitor CB1 in the driving power supply circuit is one.

[0098] The first power supply circuit 110 and the second power supply circuit 120 may be integrated or separated, and may be specifically configured according to actual needs.

[0099] An input end of the first power supply circuit 110 is electrically connected to an input end PMID1 of the Dickson switched capacitor voltage converter 1000. A first output end of the first power supply circuit 110 is electrically connected to a power supply end of a first drive circuit D1 of the first power switch tube K1. A first ground end of the first power supply circuit 110 and a ground end of the first drive circuit D1 are both electrically connected to a source end of the first power switch tube K1. A second output end of the first power supply circuit 110 is electrically connected to a power supply end of a second drive circuit D2 of the second power switch tube K2. A second ground end of the second power supply circuit 120 and a ground end of the second drive circuit D2 are both electrically connected to a source end of the second power switch tube K2.

[0100] The input terminal of the second power supply circuit 120 is electrically connected to the upper plate of the first flying capacitor CFLY1. The first output terminal of the second power supply circuit 120 is electrically connected to the power terminal of the third drive circuit D3 of the third power switch tube K3. The first ground terminal of the second power supply circuit 120 and the ground terminal of the third drive circuit D3 are both electrically connected to the source terminal of the third power switch tube K3. The second output terminal of the second power supply circuit 120 is electrically connected to the power terminal of the fourth drive circuit D4 of the fourth power switch tube K4. The second ground terminal of the second power supply circuit 120 and the ground terminal of the fourth drive circuit D4 are both electrically connected to the source terminal of the fourth power switch tube K4. When the third power switch tube K3 is the third power switch tube K3A in the first charge and discharge circuit 210, the first flying capacitor CFLY1 is the first flying capacitor CFLY1B in the second charge and discharge circuit 220. Alternatively, when the third power switch tube K3 is the third power switch tube K3B in the second charge and discharge circuit 220, the first flying capacitor CFLY1 is the first flying capacitor CFLY1A in the first charge and discharge circuit 210.

[0101] The power supply terminal of the fifth drive circuit D5 of the fifth power switch tube K5 and the power supply terminal of the seventh drive circuit D7 of the seventh power switch tube K7 are both electrically connected to the output terminal of the Dickson switched capacitor voltage converter 1000. The ground terminal of the fifth drive circuit D5 and the ground terminal of the seventh drive circuit D7 are both grounded. The power supply terminal of the sixth drive circuit D6 of the sixth power switch tube K6 is electrically connected to the upper plate of the second flyback capacitor CFLY2, and the ground terminal of the sixth drive circuit D6 is electrically connected to the source terminal of the sixth power switch tube K6. When the sixth power switch tube K6 is the sixth power switch tube K6A in the first charge and discharge circuit 210, the second flyback capacitor CFLY2 is the second flyback capacitor CFLY2A in the first charge and discharge circuit 210. Alternatively, when the sixth power switch tube K6 is the sixth power switch tube K6B in the second charge and discharge circuit 220, the second flyback capacitor CFLY2 is the second flyback capacitor CFLY2B in the second charge and discharge circuit 220.

[0102] Since the first charge-discharge circuit 210 and the second charge-discharge circuit 220 may each include a first power switch tube K1, a second power switch tube K2, a third power switch tube K3, a fourth power switch tube K4, a fifth power switch tube K5, a sixth power switch tube K6, a seventh power switch tube K7, a first flying capacitor CFLY1, and a second flying capacitor CFLY2, the number of first power supply circuits 110 and the number of second power supply circuits 120 are both two.

[0103] It should be noted that Figure 4In order to illustrate the connection relationship clearly and concisely, only the module division of the first power supply circuit 110 corresponding to the first drive circuit D1A and the second drive circuit D2A, and the second power supply circuit 110 corresponding to the third drive circuit D3A and the fourth drive circuit D4A are illustrated.

[0104] The first power supply circuit 110 can use the voltage VB1 on the bootstrap capacitor CB1 to supply power to the first drive circuit D1 and the second drive circuit D2 respectively, so that the first drive circuit D1 can drive the first power switch tube K1 to turn on or off, and the second drive circuit D2 can drive the first power switch tube K2 to turn on or off.

[0105] The second power supply circuit 120 can utilize the voltage on the first flying capacitor CFLY1 to power the third drive circuit D3 and the fourth drive circuit D4 through the clamping transistor in the second power supply circuit 120, respectively. This ensures that the voltage at the first terminal of the clamping transistor in the second power supply circuit 120 is equal to the voltage at the second terminal. In other words, there is no voltage drop across the voltage of the clamping transistor in the second power supply circuit 120. This reduces the gate drive loss of the third power switch K3 and the fourth power switch K4, enabling the Dickson switched capacitor voltage converter to meet the application requirements of high conversion efficiency. Furthermore, because the driver power supply circuit only has one bootstrap capacitor CB1, the driver power supply circuit can utilize the voltage on the first flying capacitor CFLY1 to power the third drive circuit D3 and the fourth drive circuit D4 without the need for additional bootstrap capacitors CB1 and pins. This allows the Dickson switched capacitor voltage converter to meet the application requirements of low cost. Thus, the Dickson switched capacitor voltage converter can achieve both high conversion efficiency and low cost.

[0106] The driver power supply circuit provided in this application, when the Dickson switched capacitor voltage converter 1000 is a 3:1 switched capacitor voltage converter, can utilize the voltage on the bootstrap capacitor to respectively power the first and second driver circuits through the first power supply circuit. The second power supply circuit can utilize the voltage on the first flying capacitor to respectively power the third and fourth driver circuits through the clamping transistor in the second power supply circuit, thereby making the first terminal voltage of the clamping transistor in the second power supply circuit equal to the second terminal voltage, reducing the gate drive loss of the third and fourth power switch transistors, thereby reducing the loss of the Dickson switched capacitor voltage converter and achieving high conversion efficiency application requirements. At the same time, because the number of bootstrap capacitors in the driver power supply circuit is only one, the driver power supply circuit can utilize the first flying capacitor to power the third and fourth driver circuits without the need for additional bootstrap capacitors and pins, enabling the Dickson switched capacitor voltage converter to achieve low-cost application requirements. Thus, the Dickson switched capacitor voltage converter can meet both high conversion efficiency and low-cost application requirements.

[0107] Based on the description of the above embodiment, a possible implementation of the second power supply circuit 120 is exemplified. Figure 4 As shown, the second power supply circuit 120 may include: a first clamping transistor Mn1 , a first clamping transistor driving circuit 121 , a second clamping transistor Mn2 , and a second clamping transistor driving circuit 122 .

[0108] A first end of the first clamping transistor Mn1 is electrically connected to the upper plate of the first flying capacitor CFLY1. A second end of the first clamping transistor Mn1 is electrically connected to the power supply terminal of the third drive circuit D3 and the first end of the second clamping transistor Mn2, respectively. A control end of the first clamping transistor Mn1 is electrically connected to the output end of the first clamping transistor drive circuit 121. An input end of the first clamping transistor drive circuit 121 and an input end of the second clamping transistor drive circuit 122 are both electrically connected to a first voltage VH1. A ground end of the first clamping transistor drive circuit 121 is electrically connected to the ground end of the third drive circuit D3. A second end of the second clamping transistor Mn2 is electrically connected to the power supply terminal of the fourth drive circuit D4. A control end of the second clamping transistor Mn2 is electrically connected to the output end of the second clamping transistor drive circuit 122. A ground end of the second clamping transistor drive circuit 122 is electrically connected to the ground end of the fourth drive circuit D4.

[0109] In some examples, the driving power supply circuit may further include: a boost circuit Pump1.

[0110] An input end of the boost circuit Pump1 is electrically connected to an input end PMID1 of the Dickson switched capacitor voltage converter 1000 , and an output end of the boost circuit Pump1 is used to output a first voltage VH1 .

[0111] The boost circuit Pump1 can boost the input voltage of the Dickson switched capacitor voltage converter 1000 to obtain a first voltage VH1 .

[0112] The first end of the first clamping transistor Mn1 is the input end of the second power supply circuit 120, the second end of the first clamping transistor Mn1 is the first output end of the second power supply circuit 120, the ground end of the first clamping transistor driving circuit 121 is the first ground end of the second power supply circuit 120, the second end of the second clamping transistor Mn2 is the second output end of the second power supply circuit 120, and the ground end of the second clamping transistor driving circuit 122 is the second ground end of the second power supply circuit 120.

[0113] The first clamping transistor driving circuit 121 can control the first clamping transistor Mn1 to be turned on based on the first voltage VH1, so that the voltage on the first flying capacitor CFLY1 supplies power to the third driving circuit D3.

[0114] The second clamping transistor driving circuit 122 can control the second clamping transistor Mn2 to be turned on based on the first voltage VH1, so that the voltage on the first flying capacitor CFLY1 supplies power to the fourth driving circuit D4.

[0115] Based on the description of the above embodiment, for example, a possible implementation of the first clamping transistor Mn1 and the second clamping transistor Mn2 is as follows. Figure 4 As shown, the first clamping transistor Mn1 may include: a first N-type field effect transistor and a second N-type field effect transistor, and the second clamping transistor Mn2 is a third N-type field effect transistor.

[0116] The drain terminal of the first N-type field effect transistor is electrically connected to the upper plate of the first flying capacitor CFLY1, the source terminal of the first N-type field effect transistor is electrically connected to the source terminal of the second N-type field effect transistor, the drain terminal of the second N-type field effect transistor is electrically connected to the power supply terminal of the third drive circuit D3 and the drain terminal of the third N-type field effect transistor, respectively, the gate terminal of the first N-type field effect transistor and the gate terminal of the second N-type field effect transistor are both electrically connected to the output terminal of the first clamping transistor drive circuit 121, the gate terminal of the third N-type field effect transistor is electrically connected to the output terminal of the second clamping transistor drive circuit 122, and the source terminal of the third N-type field effect transistor is electrically connected to the power supply terminal of the fourth drive circuit D4.

[0117] Among them, the drain terminal of the first N-type field effect transistor is the first terminal of the first clamping transistor Mn1, the drain terminal of the second N-type field effect transistor is the second terminal of the first clamping transistor Mn1, the gate terminal of the first N-type field effect transistor and the gate terminal of the second N-type field effect transistor are both control terminals of the first clamping transistor Mn1, the source terminal of the third N-type field effect transistor is the first terminal of the second clamping transistor Mn2, the gate terminal of the third N-type field effect transistor is the control terminal of the second clamping transistor Mn2, and the source terminal of the third N-type field effect transistor is the second terminal of the second clamping transistor Mn2.

[0118] Based on the description of the above embodiment, for example, a possible implementation of the first clamping tube driving circuit 121 or the second clamping tube driving circuit 122 is as follows. Figure 4 As shown, the first clamping tube driving circuit 121 or the second clamping tube driving circuit 122 may include: a first current source, a first Zener diode zd1 and a first capacitor c1.

[0119] An input terminal of the first current source is electrically connected to a first voltage VH1, an output terminal of the first current source is electrically connected to a cathode of a first Zener diode zd1, an upper plate of a first capacitor c1, and a control terminal of a first clamping transistor Mn1, and an anode of the first Zener diode zd1 and a lower plate of the first capacitor c1 are both electrically connected to a ground terminal of a third drive circuit D3; alternatively, an output terminal of the first current source is electrically connected to a cathode of the first Zener diode zd1, an upper plate of the first capacitor c1, and a control terminal of a second clamping transistor Mn2, respectively, and an anode of the first Zener diode zd1 and a lower plate of the first capacitor c1 are both electrically connected to a ground terminal of a fourth drive circuit D4.

[0120] When the first clamping transistor driving circuit 121 includes a first current source, a first Zener diode zd1, and a first capacitor c1, the output end of the first current source is electrically connected to the cathode of the first Zener diode zd1, the upper plate of the first capacitor c1, and the control end of the first clamping transistor Mn1, and the anode of the first Zener diode zd1 and the lower plate of the first capacitor c1 are both electrically connected to the ground end of the third driving circuit D3.

[0121] When the second clamping transistor driving circuit 122 includes a first current source, a first Zener diode zd1, and a first capacitor c1, the output end of the first current source is electrically connected to the cathode of the first Zener diode zd1, the upper plate of the first capacitor c1, and the control end of the second clamping transistor Mn2, respectively; the anode of the first Zener diode zd1 and the lower plate of the first capacitor c1 are both electrically connected to the ground end of the fourth driving circuit D4.

[0122] Based on the description of the above embodiment, a possible implementation of the first power supply circuit 110 is exemplified. Figure 4As shown, the first power supply circuit 110 may include: a fourth N-type field effect transistor N4A, a field effect transistor driving circuit 111, a first P-type field effect transistor Mp1, a third clamping transistor Mn3, a third clamping transistor driving circuit 112 and a bootstrap capacitor CB1.

[0123] The drain terminal of the fourth N-type field effect transistor N4A is electrically connected to the input terminal PMID1 of the Dickson switched capacitor voltage converter 1000, the gate terminal of the fourth N-type field effect transistor N4A is electrically connected to the output terminal of the field effect transistor driving circuit 111, the source terminal of the fourth N-type field effect transistor N4A is electrically connected to the source terminal of the first P-type field effect transistor Mp1, the gate terminal of the first P-type field effect transistor Mp1 is used to receive the control signal, and the drain terminal of the first P-type field effect transistor Mp1 is respectively connected to the upper plate of the bootstrap capacitor CB1, the power supply terminal of the first driving circuit D1 and the third clamping transistor. A first end of Mn3 is electrically connected to the input end of the field effect transistor driving circuit 111 and the input end of the third clamping transistor driving circuit 112, both of which are electrically connected to the first voltage VH1. The ground end of the field effect transistor driving circuit 111 and the lower plate of the bootstrap capacitor CB1 are both electrically connected to the ground end of the first driving circuit D1. A second end of the third clamping transistor Mn3 is electrically connected to the power supply end of the second driving circuit D2. A control end of the third clamping transistor Mn3 is electrically connected to the output end of the third clamping transistor driving circuit 112. A ground end of the third clamping transistor driving circuit 112 is electrically connected to the ground end of the second driving circuit D2.

[0124] Among them, the drain terminal of the fourth N-type field-effect transistor N4A is the input terminal of the first power supply circuit 110, the drain terminal of the first P-type field-effect transistor Mp1 is the first output terminal of the first power supply circuit 110, the ground terminal of the field-effect transistor driving circuit 111 and the lower plate of the bootstrap capacitor CB1 are both the first ground terminal of the first power supply circuit 110, the second terminal of the third clamping transistor Mn3 is the second output terminal of the first power supply circuit 110, and the ground terminal of the third clamping transistor driving circuit 112 is the second ground terminal of the second power supply circuit 120.

[0125] In some examples, the third clamping transistor Mn3 is a fifth N-type field effect transistor. The drain terminal of the fifth N-type field effect transistor is the first terminal of the third clamping transistor Mn3, the gate terminal of the fifth N-type field effect transistor is the control terminal of the third clamping transistor Mn3, and the source terminal of the fifth N-type field effect transistor is the second terminal of the third clamping transistor Mn3.

[0126] The field effect transistor driving circuit 111 can control the fourth N-type field effect transistor N4A to be turned on based on the first voltage VH1.

[0127] Thus, when the fourth N-type field effect transistor N4A is turned on, the first P-type field effect transistor Mp1 can be turned on or off according to the control signal, so that the voltage VB1 on the bootstrap capacitor CB1 supplies power to the first driving circuit D1.

[0128] The third clamping transistor driving circuit 112 can control the third clamping transistor Mn3 to be turned on based on the first voltage VH1 , so that the voltage VB1 on the bootstrap capacitor CB1 supplies power to the second driving circuit D2 .

[0129] Based on the description of the above embodiment, a possible implementation of the first power supply circuit 110 is exemplified. Figure 4 As shown, the field effect transistor driving circuit 111 or the third clamping transistor driving circuit 112 may include: a second current source, a second Zener diode zd2 and a second capacitor c2.

[0130] An input end of the second current source is electrically connected to the first voltage VH1, an output end of the second current source is electrically connected to the cathode of the second Zener diode zd2, the upper plate of the second capacitor C2, and the gate end of the fourth N-type field effect transistor N4A, and an anode of the second Zener diode zd2 and a lower plate of the second capacitor C2 are both electrically connected to the ground end of the first drive circuit D1.

[0131] or,

[0132] The output end of the second current source is electrically connected to the cathode of the second Zener diode zd2, the upper plate of the second capacitor c2, and the control end of the third clamping transistor Mn3, respectively. The anode of the second Zener diode zd2 and the lower plate of the second capacitor c2 are both electrically connected to the ground end of the second driving circuit D2.

[0133] In which, when the field effect transistor driving circuit 111 includes a second current source, a second Zener diode zd2 and a second capacitor c2, the output end of the second current source is electrically connected to the cathode of the second Zener diode zd2, the upper plate of the second capacitor c2 and the gate end of the fourth N-type field effect transistor N4A, and the anode of the second Zener diode zd2 and the lower plate of the second capacitor c2 are both electrically connected to the ground end of the first driving circuit D1.

[0134] When the third clamping transistor driving circuit 112 includes a second current source, a second Zener diode zd2, and a second capacitor c2, the output end of the second current source is electrically connected to the cathode of the second Zener diode zd2, the upper plate of the second capacitor c2, and the control end of the third clamping transistor Mn3, respectively, and the anode of the second Zener diode zd2 and the lower plate of the second capacitor c2 are both electrically connected to the ground end of the second driving circuit D2.

[0135] Based on the description of the above embodiment, a possible implementation of the driving power supply circuit is exemplified. Figure 4 As shown, when the Dickson switched capacitor voltage converter 1000 is a 2:1 switched capacitor voltage converter, the driving power supply circuit may further include: a third power supply circuit 130 .

[0136] An input end of the third power supply circuit 130 is electrically connected to the first output end of the first power supply circuit 110 , and an output end of the third power supply circuit 130 is electrically connected to a power supply end of the third driving circuit D3 .

[0137] The first power supply circuit 110 can use the voltage VB1 on the bootstrap capacitor CB1 to supply power to the first driving circuit D1 and the second driving circuit D2 respectively.

[0138] The first power supply circuit 110 can use the voltage VB1A on the bootstrap capacitor CB1A to supply power to the first drive circuit D1A and the second drive circuit D2A, respectively. The first power supply circuit 110 can use the voltage VB1B on the bootstrap capacitor CB1B to supply power to the first drive circuit D1B and the second drive circuit D2B, respectively.

[0139] The third power supply circuit 130 can use the voltage VB1 on the bootstrap capacitor CB1 to supply power to the third driving circuit D3 and the fourth driving circuit D4 through the clamping transistor in the third power supply circuit 130 .

[0140] The third power supply circuit 130 can use the voltage VB1A on the bootstrap capacitor CB1A to supply power to the third drive circuit D3A and the fourth drive circuit D4A through the clamping transistors in the third power supply circuit 130. The third power supply circuit 130 can use the voltage VB1B on the bootstrap capacitor CB1B to supply power to the third drive circuit D3B and the fourth drive circuit D4B through the clamping transistors in the third power supply circuit 130.

[0141] Therefore, the driving power supply circuit can be flexibly switched following the switching of the Dickson switched capacitor voltage converter 1000 between the 3:1 switched capacitor voltage converter and the 2:1 switched capacitor voltage converter.

[0142] Based on the description of the above embodiment, another possible implementation of the driving power supply circuit is exemplified. Figure 4 As shown, when the Dickson switched capacitor voltage converter 1000 is a 1:1 switched capacitor voltage converter, the driving power supply circuit may further include: a fourth power supply circuit 140 .

[0143] An input terminal of the fourth power supply circuit 140 is electrically connected to the first voltage VH1 , and an output terminal of the fourth power supply circuit 140 is electrically connected to a power terminal of the first driving circuit D1 .

[0144] The fourth power supply circuit 140 can use the first voltage VH1 to charge the bootstrap capacitor CB1 through the clamping transistor in the fourth power supply circuit 140 , so that the voltage VB1 on the bootstrap capacitor CB1 supplies power to the first drive circuit D1 and the second drive circuit D2 respectively.

[0145] The fourth power supply circuit 140 can use the first voltage VH1 to charge the bootstrap capacitor CB1A via the clamping transistor in the fourth power supply circuit 140, so that the voltage VB1A on the bootstrap capacitor CB1A can supply power to the first drive circuit D1A and the second drive circuit D2A, respectively. The fourth power supply circuit 140 can use the first voltage VH1 to charge the bootstrap capacitor CB1B via the clamping transistor in the fourth power supply circuit 140, so that the voltage VB1B on the bootstrap capacitor CB1B can supply power to the first drive circuit D1B and the second drive circuit D2B, respectively.

[0146] The third power supply circuit 130 can use the voltage VB1 on the bootstrap capacitor CB1 to supply power to the third driving circuit D3 and the fourth driving circuit D4 through the clamping transistor in the third power supply circuit 130 .

[0147] The third power supply circuit 130 can use the voltage VB1A on the bootstrap capacitor CB1A to supply power to the third drive circuit D3A and the fourth drive circuit D4A through the clamping transistors in the third power supply circuit 130. The third power supply circuit 130 can use the voltage VB1B on the bootstrap capacitor CB1B to supply power to the third drive circuit D3B and the fourth drive circuit D4B through the clamping transistors in the third power supply circuit 130.

[0148] Thus, the driving power supply circuit can be flexibly switched following the switching of the Dickson switched capacitor voltage converter 1000 between a 3:1 switched capacitor voltage converter, a 2:1 switched capacitor voltage converter, and a 1:1 switched capacitor voltage converter.

[0149] exist Figure 4 When the Dickson switched capacitor voltage converter 1000 is a 3:1 switched capacitor voltage converter, the power supply mode of each driving circuit is as follows.

[0150] When the first power switch K1A is on, the first drive circuit D1A is powered by the voltage VB1A on the bootstrap capacitor CB1A. This means that the first drive circuit D1A is powered by the voltage VB1A on the bootstrap capacitor CB1A. When the first power switch K1B is on, the first drive circuit D1B is powered by the voltage VB1B on the bootstrap capacitor CB1B. When the first power switch K1A is off, the input terminal PMID1 of the Dickson switched capacitor voltage converter 1000 charges the bootstrap capacitor CB1A via the first P-type field-effect transistor Mp1A. When the first power switch K1B is off, the input terminal PMID1 of the Dickson switched capacitor voltage converter 1000 charges the bootstrap capacitor CB1B via the first P-type field-effect transistor Mp1B.

[0151] The second drive circuit D2A is powered by the voltage VB1A on the bootstrap capacitor CB1A through the clamping of the third clamping transistor Mn3A. The second drive circuit D2B is powered by the voltage VB1B on the bootstrap capacitor CB1B through the clamping of the third clamping transistor Mn3B.

[0152] The third drive circuit D3A is powered by the first flying capacitor CFLY1A through the clamping of the first clamping transistor Mn1A. The third drive circuit D3B is powered by the first flying capacitor CFLY1B through the clamping of the first clamping transistor Mn1B. The fourth drive circuit D4A is powered by the first flying capacitor CFLY1A through the clamping of the second clamping transistor Mn2A. The fourth drive circuit D4B is powered by the first flying capacitor CFLY1B through the clamping of the second clamping transistor Mn2B.

[0153] The fifth driving circuit D5A, the seventh driving circuit D7A, the fifth driving circuit D5B and the seventh driving circuit D7B are all powered by the output voltage VOUT1 of the Dickson switched capacitor voltage converter 1000 .

[0154] The sixth driving circuit D6A is powered by the top plate voltage C2PA of the second flying capacitor CFLY2A, that is, powered by the second flying capacitor CFLY2A. The sixth driving circuit D6B is powered by the top plate voltage C2PB of the second flying capacitor CFLY2B, that is, powered by the second flying capacitor CFLY2B.

[0155] exist Figure 4When the Dickson switched capacitor voltage converter 1000 is a 3:1 switched capacitor voltage converter, there is no voltage drop across the first clamping transistor Mn1A, the first clamping transistor Mn1B, the second clamping transistor Mn2A, and the second clamping transistor Mn2B. Therefore, the gate drive losses of the third power switch transistor K3A, the third power switch transistor K3B, the fourth power switch transistor K4A, and the fourth power switch transistor K4B are reduced, enabling the Dickson switched capacitor voltage converter to meet application requirements for high conversion efficiency.

[0156] Next, taking an input voltage VIN1 of 15V, an output voltage VOUT1 of 5V, and a through voltage of the first flying capacitor CFLY1A and the through voltage of the first flying capacitor CFLY1B both of 10V as an example, the principle of zero gate drive loss for the first clamping transistor Mn1A, the first clamping transistor Mn1B, the second clamping transistor Mn2A, and the second clamping transistor Mn2B in Phase 1 and Phase 2 is described.

[0157] In Phase 1, the control terminal voltage of the third power switch K3A is 5V higher than the output voltage VOUT1, and the second terminal voltage of the first clamping transistor Mn1A is 10V. Correspondingly, because the fifth power switch K5B is on, the lower plate voltage C1LB of the first flying capacitor CFLY1B is 0V. Consequently, the upper plate voltage C1PB of the first flying capacitor CFLY1B is 10V, and the first terminal voltage of the first clamping transistor Mn1A is 10V. At this point, the first terminal voltage and the second terminal voltage of the first clamping transistor Mn1A are the same, and there is no voltage drop across the first clamping transistor Mn1A, resulting in no additional gate drive loss for the third power switch K3A.

[0158] In Phase 1, the control terminal voltage of the third power switch K3A is 5V higher than the output voltage VOUT1, and the second terminal voltage of the second clamping transistor Mn2A is 10V. Correspondingly, because the fifth power switch K5B is on, the lower plate voltage C1LB of the first flying capacitor CFLY1B is 0V. Consequently, the upper plate voltage C1PB of the first flying capacitor CFLY1B is 10V, and the first terminal voltage of the first clamping transistor Mn1A is 10V, causing the first terminal voltage of the second clamping transistor Mn2A to also be 10V. At this point, the first terminal voltage and the second terminal voltage of the second clamping transistor Mn2A are the same, and there is no voltage drop across the voltage of the second clamping transistor Mn2A, resulting in no additional gate drive loss for the fourth power switch K4A.

[0159] In Phase 2, the principle that the third power switch tube K3B has no additional gate drive loss is similar to the principle that the third power switch tube K3A has no additional gate drive loss, and the principle that the third power switch tube K3B has no additional gate drive loss is not repeated here.

[0160] In Phase 2, the principle that the fourth power switch tube K4B has no additional gate drive loss is similar to the principle that the fourth power switch tube K4A has no additional gate drive loss, and the principle that the fourth power switch tube K4B has no additional gate drive loss is not repeated here.

[0161] 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 driving power supply circuit, characterized in that: The drive power supply circuit is applied to a Dickson switched capacitor voltage converter, which includes: a first charge and discharge circuit and a second charge and discharge circuit, wherein a first end of the first charge and discharge circuit and a first end of the second charge and discharge circuit are both electrically connected to an input end of the Dickson switched capacitor voltage converter, a second end of the first charge and discharge circuit and a second end of the second charge and discharge circuit are both electrically connected to an output end of the Dickson switched capacitor voltage converter, and the first charge and discharge circuit and the second charge and discharge circuit are connected in parallel; the first charge and discharge circuit and the second charge and discharge circuit each include: a first power switch tube, a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, a first flying capacitor and a second flying capacitor; In the case where the Dickson switched capacitor voltage converter is a 3:1 switched capacitor voltage converter, the driving power supply circuit includes: a first power supply circuit and a second power supply circuit, and the number of the bootstrap capacitor in the driving power supply circuit is one; An input end of the first power supply circuit is electrically connected to an input end of the Dickson switched capacitor voltage converter, a first output end of the first power supply circuit is electrically connected to a power supply end of a first drive circuit of the first power switch tube, a first ground end of the first power supply circuit and a ground end of the first drive circuit are both electrically connected to a source end of the first power switch tube, a second output end of the first power supply circuit is electrically connected to a power supply end of a second drive circuit of the second power switch tube, and a second ground end of the second power supply circuit and a ground end of the second drive circuit are both electrically connected to a source end of the second power switch tube; An input terminal of the second power supply circuit is electrically connected to the upper plate of the first flying capacitor, a first output terminal of the second power supply circuit is electrically connected to the power terminal of the third drive circuit of the third power switch tube, a first ground terminal of the second power supply circuit and a ground terminal of the third drive circuit are both electrically connected to the source terminal of the third power switch tube, a second output terminal of the second power supply circuit is electrically connected to the power terminal of the fourth drive circuit of the fourth power switch tube, and a second ground terminal of the second power supply circuit and a ground terminal of the fourth drive circuit are both electrically connected to the source terminal of the fourth power switch tube. When the third power switch tube is the third power switch tube in the first charge-discharge circuit, the first flying capacitor is the first flying capacitor in the second charge-discharge circuit, or when the third power switch tube is the third power switch tube in the second charge-discharge circuit, the first flying capacitor is the first flying capacitor in the first charge-discharge circuit. The power supply terminal of the fifth drive circuit of the fifth power switch tube and the power supply terminal of the seventh drive circuit of the seventh power switch tube are both electrically connected to the output terminal of the Dickson switched capacitor voltage converter, the ground terminal of the fifth drive circuit and the ground terminal of the seventh drive circuit are both grounded, the power supply terminal of the sixth drive circuit of the sixth power switch tube is electrically connected to the upper plate of the second flying capacitor, and the ground terminal of the sixth drive circuit is electrically connected to the source terminal of the sixth power switch tube; wherein, when the sixth power switch tube is the sixth power switch tube in the first charge and discharge circuit, the second flying capacitor is the second flying capacitor in the first charge and discharge circuit, or when the sixth power switch tube is the sixth power switch tube in the second charge and discharge circuit, the second flying capacitor is the second flying capacitor in the second charge and discharge circuit; The first power supply circuit is configured to supply power to the first drive circuit and the second drive circuit respectively using the voltage on the bootstrap capacitor; The second power supply circuit is used to use the voltage on the first flying capacitor to supply power to the third drive circuit and the fourth drive circuit respectively through the clamping tube in the second power supply circuit, so that the first terminal voltage and the second terminal voltage of the clamping tube in the second power supply circuit are equal.

2. The circuit according to claim 1, wherein: The second power supply circuit includes: a first clamping tube, a first clamping tube driving circuit, a second clamping tube and a second clamping tube driving circuit; The first end of the first clamping transistor is electrically connected to the upper plate of the first flying capacitor, the second end of the first clamping transistor is electrically connected to the power supply terminal of the third driving circuit and the first end of the second clamping transistor respectively, the control end of the first clamping transistor is electrically connected to the output end of the first clamping transistor driving circuit, the input end of the first clamping transistor driving circuit and the input end of the second clamping transistor driving circuit are both electrically connected to a first voltage, the ground end of the first clamping transistor driving circuit is electrically connected to the ground end of the third driving circuit, the second end of the second clamping transistor is electrically connected to the power supply terminal of the fourth driving circuit, the control end of the second clamping transistor is electrically connected to the output end of the second clamping transistor driving circuit, and the ground end of the second clamping transistor driving circuit is electrically connected to the ground end of the fourth driving circuit; The first clamping tube driving circuit is configured to control the first clamping tube to be turned on based on the first voltage, so that the voltage on the first flying capacitor supplies power to the third driving circuit; The second clamping tube driving circuit is used to control the second clamping tube to be turned on based on the first voltage, so that the voltage on the first flying capacitor supplies power to the fourth driving circuit.

3. The circuit according to claim 2, characterized in that The first clamping tube includes: a first N-type field effect transistor and a second N-type field effect transistor, and the second clamping tube is a third N-type field effect transistor; The drain terminal of the first N-type field effect transistor is electrically connected to the upper plate of the first flying capacitor, the source terminal of the first N-type field effect transistor is electrically connected to the source terminal of the second N-type field effect transistor, the drain terminal of the second N-type field effect transistor is electrically connected to the power supply terminal of the third driving circuit and the drain terminal of the third N-type field effect transistor, respectively, the gate terminal of the first N-type field effect transistor and the gate terminal of the second N-type field effect transistor are both electrically connected to the output terminal of the first clamping tube driving circuit, the gate terminal of the third N-type field effect transistor is electrically connected to the output terminal of the second clamping tube driving circuit, and the source terminal of the third N-type field effect transistor is electrically connected to the power supply terminal of the fourth driving circuit.

4. The circuit according to claim 2, characterized in that The first clamping tube driving circuit includes: a first current source, a first Zener diode and a first capacitor; The input end of the first current source is electrically connected to the first voltage, the output end of the first current source is electrically connected to the cathode of the first Zener diode, the upper plate of the first capacitor and the control end of the first clamping tube, and the anode of the first Zener diode and the lower plate of the first capacitor are both electrically connected to the ground end of the third driving circuit.

5. The circuit according to claim 2, characterized in that The second clamping tube driving circuit includes: a first current source, a first Zener diode and a first capacitor; The input end of the first current source is electrically connected to the first voltage, the output end of the first current source is electrically connected to the cathode of the first Zener diode, the upper plate of the first capacitor and the control end of the second clamping tube respectively, and the anode of the first Zener diode and the lower plate of the first capacitor are both electrically connected to the ground end of the fourth driving circuit.

6. The circuit according to claim 1, wherein: The first power supply circuit includes: a fourth N-type field effect transistor, a field effect transistor driving circuit, a first P-type field effect transistor, a third clamping transistor, a third clamping transistor driving circuit and the bootstrap capacitor; The drain terminal of the fourth N-type field effect transistor is electrically connected to the input terminal of the Dickson switched capacitor voltage converter, the gate terminal of the fourth N-type field effect transistor is electrically connected to the output terminal of the field effect transistor driving circuit, the source terminal of the fourth N-type field effect transistor is electrically connected to the source terminal of the first P-type field effect transistor, the gate terminal of the first P-type field effect transistor is used to receive a control signal, the drain terminal of the first P-type field effect transistor is electrically connected to the upper plate of the bootstrap capacitor, the power supply terminal of the first driving circuit, and the first terminal of the third clamping transistor, respectively. The input terminal of the field effect transistor driving circuit and the input terminal of the third clamping transistor driving circuit are both electrically connected to a first voltage. The ground terminal of the field effect transistor driving circuit and the lower plate of the bootstrap capacitor are both electrically connected to the ground terminal of the first driving circuit. The second terminal of the third clamping transistor is electrically connected to the power supply terminal of the second driving circuit. The control terminal of the third clamping transistor is electrically connected to the output terminal of the third clamping transistor driving circuit. The ground terminal of the third clamping transistor driving circuit is electrically connected to the ground terminal of the second driving circuit. The field effect transistor driving circuit is configured to control the fourth N-type field effect transistor to be turned on based on the first voltage; the first P-type field effect transistor is configured to be turned on or off according to the control signal when the fourth N-type field effect transistor is turned on, so that the voltage on the bootstrap capacitor supplies power to the first driving circuit; The third clamping tube driving circuit is used to control the third clamping tube to be turned on based on the first voltage, so that the voltage on the bootstrap capacitor supplies power to the second driving circuit.

7. The circuit according to claim 6, characterized in that The field effect transistor driving circuit includes: a second current source, a second Zener diode and a second capacitor; The input end of the second current source is electrically connected to the first voltage, the output end of the second current source is electrically connected to the negative electrode of the second Zener diode, the upper plate of the second capacitor and the gate end of the fourth N-type field effect transistor, and the positive electrode of the second Zener diode and the lower plate of the second capacitor are both electrically connected to the ground end of the first drive circuit.

8. The circuit according to claim 6, characterized in that The third clamping tube driving circuit includes: a second current source, a second Zener diode and a second capacitor; The input end of the second current source is electrically connected to the first voltage, the output end of the second current source is electrically connected to the cathode of the second Zener diode, the upper plate of the second capacitor and the control end of the third clamping tube respectively, and the anode of the second Zener diode and the lower plate of the second capacitor are both electrically connected to the ground end of the second driving circuit.

9. The circuit according to any one of claims 1 to 8, characterized in that: In the case where the Dickson switched capacitor voltage converter is a 2:1 switched capacitor voltage converter, the driving power supply circuit further includes: a third power supply circuit; The input end of the third power supply circuit is electrically connected to the first output end of the first power supply circuit, and the output end of the third power supply circuit is electrically connected to the power supply end of the third driving circuit; The first power supply circuit is configured to supply power to the first drive circuit and the second drive circuit respectively using the voltage on the bootstrap capacitor; The third power supply circuit is used to utilize the voltage on the bootstrap capacitor to supply power to the third drive circuit and the fourth drive circuit respectively through the clamping tube in the third power supply circuit.

10. The circuit according to claim 9, characterized in that In the case where the Dickson switched capacitor voltage converter is a 1:1 switched capacitor voltage converter, the driving power supply circuit further includes: a fourth power supply circuit; The input end of the fourth power supply circuit is electrically connected to the first voltage, and the output end of the fourth power supply circuit is electrically connected to the power supply end of the first drive circuit; The fourth power supply circuit is configured to use the first voltage to charge the bootstrap capacitor via a clamping transistor in the fourth power supply circuit, so that the voltage on the bootstrap capacitor supplies power to the first drive circuit and the second drive circuit respectively; The third power supply circuit is used to utilize the voltage on the bootstrap capacitor to supply power to the third drive circuit and the fourth drive circuit respectively through the clamping tube in the third power supply circuit.

11. A Dickson switched capacitor voltage converter, characterized in that: The Dickson switched capacitor voltage converter comprises: a first charge and discharge circuit, a second charge and discharge circuit, and a driving power supply circuit according to any one of claims 1 to 10; The first end of the first charge-discharge circuit and the first end of the second charge-discharge circuit are both electrically connected to the input end of the Dickson switched capacitor voltage converter, the second end of the first charge-discharge circuit and the second end of the second charge-discharge circuit are both electrically connected to the output end of the Dickson switched capacitor voltage converter, and the first charge-discharge circuit and the second charge-discharge circuit are connected in parallel; The first charge and discharge circuit and the second charge and discharge circuit each include: a first power switch tube, a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, a first flying capacitor, a second flying capacitor, a first drive circuit, a second drive circuit, a third drive circuit, a fourth drive circuit, a fifth drive circuit, a sixth drive circuit, and a seventh drive circuit; The drain terminal of the first power switch tube is electrically connected to the input terminal of the Dickson switched capacitor voltage converter, the gate terminal of the first power switch tube is electrically connected to the first drive circuit, the source terminal of the first power switch tube is electrically connected to the drain terminal of the second power switch tube, the gate terminal of the second power switch tube is electrically connected to the second drive circuit, the source terminal of the second power switch tube is electrically connected to the drain terminal of the third power switch tube, the gate terminal of the third power switch tube is electrically connected to the third drive circuit, the source terminal of the third power switch tube is electrically connected to the drain terminal of the fourth power switch tube and the gate terminal of the third power switch tube, respectively. The drain terminal of the sixth power switch tube is electrically connected, the gate terminal of the fourth power switch tube is electrically connected to the fourth drive circuit, the source terminal of the fourth power switch tube is electrically connected to the drain terminal of the fifth power switch tube, the gate terminal of the fifth power switch tube is electrically connected to the fifth drive circuit, the gate terminal of the sixth power switch tube is electrically connected to the sixth drive circuit, the gate terminal of the seventh power switch tube is electrically connected to the seventh drive circuit, the source terminal of the sixth power switch tube is electrically connected to the drain terminal of the seventh power switch tube, and the source terminal of the fifth power switch tube and the source terminal of the seventh power switch tube are both grounded; The upper plate of the first flying capacitor is electrically connected between the source terminal of the first power switch tube and the drain terminal of the second power switch tube, the lower plate of the first flying capacitor is electrically connected between the source terminal of the fourth power switch tube and the drain terminal of the fifth power switch tube, the upper plate of the second flying capacitor is electrically connected between the source terminal of the second power switch tube and the drain terminal of the third power switch tube, and the lower plate of the second flying capacitor is electrically connected between the source terminal of the sixth power switch tube and the drain terminal of the seventh power switch tube; The power supply terminals of the first drive circuit, the second drive circuit, the third drive circuit, and the fourth drive circuit are all electrically connected to the output terminal of the drive power supply circuit. The power supply terminals of the fifth drive circuit and the seventh drive circuit are both electrically connected to the output terminal of the Dickson switched capacitor voltage converter. The power supply terminal of the sixth drive circuit is electrically connected to the upper plate of the second flying capacitor. The ground terminal of the first drive circuit is electrically connected to the source terminal of the first power switch tube, the ground terminal of the second drive circuit is electrically connected to the source terminal of the second power switch tube, the ground terminal of the third drive circuit is electrically connected to the source terminal of the third power switch tube, the ground terminal of the fourth drive circuit is electrically connected to the source terminal of the fourth power switch tube, the ground terminal of the fifth drive circuit is electrically connected to the source terminal of the fifth power switch tube, the ground terminal of the sixth drive circuit is electrically connected to the source terminal of the sixth power switch tube, and the ground terminal of the seventh drive circuit is electrically connected to the source terminal of the seventh power switch tube.

12. A chip, characterized in that: include: The drive power supply circuit according to any one of claims 1 to 10, or the Dickson switched capacitor voltage converter according to claim 11.

13. An electronic device, characterized in that: include: The chip according to claim 12.

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