A high voltage bootstrap and drive circuit for a switching power converter and a method of controlling the same

Abstract

The application discloses a high-voltage bootstrap and driving circuit for a switching power converter and a control method thereof, comprising a high-voltage bootstrap module and a control module, the high-voltage bootstrap module comprising a first transistor, a second transistor, a first bootstrap capacitor, a second bootstrap capacitor, a first power transistor and a second power transistor, the first transistor and the second transistor being used for charging the first bootstrap capacitor and the second bootstrap capacitor, so as to provide a driving voltage for the first power transistor and the second power transistor; the control module is connected with the high-voltage bootstrap module, and is used for outputting a timing control signal according to an input signal, so as to control the first transistor and the second transistor to be turned on or turned off. The application can eliminate unnecessary loss caused by voltage drop on a diode, provide sufficient driving voltage for a power transistor, improve conversion efficiency, and can be widely applied in the technical field of integrated circuits.

Description

Technical Field

[0001] This application relates to the field of integrated circuit technology, and in particular to a high-voltage bootstrap and drive circuit for a switching power supply converter and its control method. Background Technology

[0002] In switching power converters, the power transistors used as switches require appropriate drive voltages to maintain normal on / off operation. In complex power supply topologies, the source terminals of power transistors may float between different power rails, necessitating the design of bootstrap circuits to ensure these floating power rail transistors have adequate drive voltages. However, existing bootstrap circuits directly charge the bootstrap capacitor using a series diode, resulting in an additional voltage drop across the diode, causing losses and insufficient drive voltage. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this application is to provide a high-voltage bootstrap and drive circuit and its control method for a switching power converter, which can eliminate unnecessary losses caused by voltage drop across the diode and provide sufficient drive voltage for the power transistor.

[0004] To achieve the above objectives, one aspect of this application provides a high-voltage bootstrap and drive circuit for a switching power supply converter, comprising: A high-voltage bootstrap module includes a first transistor, a second transistor, a first bootstrap capacitor, a second bootstrap capacitor, a first power transistor, and a second power transistor. The first transistor and the second transistor are used to charge the first bootstrap capacitor and the second bootstrap capacitor, thereby providing a drive voltage for the first power transistor and the second power transistor. The control module, connected to the high-voltage bootstrap module, is used to output timing control signals according to the input signals to control the first transistor and the second transistor to turn on or off.

[0005] In some embodiments, the timing control signal includes a first timing control signal and a second timing control signal, and the control module includes: A first control module, connected to the gate of the first transistor, is used to output the first timing control signal according to the input signal, so as to control the first transistor to be turned on or off. The second control module is connected to the gate of the second transistor and is used to output the second timing control signal according to the input signal, so as to control the second transistor to be turned on or off.

[0006] In some embodiments, the gates of both the first transistor and the second transistor are connected to the control module. The drain of the first transistor is connected to the input power supply. The drain of the second transistor, one end of the first bootstrap capacitor, and the control module are all connected to the source of the first transistor. The other end of the first bootstrap capacitor is connected to the source of the first power transistor. One end of the second bootstrap capacitor and the control module are both connected to the source of the second transistor. The other end of the second bootstrap capacitor is connected between the drain of the first power transistor and the source of the second power transistor. The drain of the first power transistor is connected to the source of the second power transistor.

[0007] In some embodiments, the first control module includes a first NMOS transistor, a first PMOS transistor, a second NMOS transistor, and a second PMOS transistor. The gate of the first NMOS transistor is connected to the input signal, and the source of the first NMOS transistor is grounded. The drain of the first PMOS transistor, the gate of the second NMOS transistor, and the gate of the first transistor are all connected to the drain of the first NMOS transistor. The gate of the first PMOS transistor is connected between the drain of the second NMOS transistor and the source of the second PMOS transistor. The source of the first PMOS transistor is connected between the source of the first transistor and the drain of the second transistor. The source of the second NMOS transistor and the gate of the second PMOS transistor are both connected to the source of the first power transistor. The drain of the second NMOS transistor is connected to the source of the second PMOS transistor, and the drain of the second PMOS transistor is connected to the input power supply.

[0008] In some embodiments, the second control module includes a third NMOS transistor, a third PMOS transistor, a fourth NMOS transistor, and a fourth PMOS transistor. The gate of the third NMOS transistor is connected to the gate of the first transistor, and the source of the third NMOS transistor is connected to the source of the first power transistor. The drain of the third PMOS transistor, the gate of the fourth NMOS transistor, and the gate of the second transistor are all connected to the drain of the third NMOS transistor. The gate of the third PMOS transistor is connected between the drain of the fourth NMOS transistor and the source of the fourth PMOS transistor. The source of the third PMOS transistor is connected to the source of the second transistor. The source of the fourth NMOS transistor and the gate of the fourth PMOS transistor are both connected to the source of the second power transistor. The drain of the fourth NMOS transistor is connected to the source of the fourth PMOS transistor, and the drain of the fourth PMOS transistor is connected to the source of the second transistor.

[0009] In some embodiments, the first NMOS transistor, the second PMOS transistor, and the second NMOS transistor and the first PMOS transistor are high-voltage MOS transistors with different voltage ratings.

[0010] In some embodiments, the third NMOS transistor, the fourth PMOS transistor, and the fourth NMOS transistor and the third PMOS transistor are high-voltage MOS transistors with different voltage ratings.

[0011] To achieve the above objectives, another aspect of this application proposes a control method for a high-voltage bootstrap and drive circuit of a switching power supply converter, comprising the following steps: The first and second transistors in the high-voltage bootstrap module charge the first and second bootstrap capacitors, thereby providing drive voltage for the first and second power transistors. The control module outputs timing control signals based on the input signals to control the first transistor and the second transistor to turn on or off.

[0012] In some embodiments, the step of the control module outputting a timing control signal based on the input signal to control the first transistor and the second transistor to be turned on or off specifically involves: When the input signal is at a first level, a first timing control signal at a second level is output to control the first transistor to turn on, and a second timing control signal at a first level is output to control the second transistor to turn off, thereby charging the first bootstrap capacitor.

[0013] In some embodiments, the step of the control module outputting a timing control signal based on the input signal to control the first transistor and the second transistor to be turned on or off specifically involves: When the input signal is at the second level, a first timing control signal at the first level is output to control the first transistor to turn off, and a second timing control signal at the second level is output to control the second transistor to turn on, thereby charging the second bootstrap capacitor.

[0014] The beneficial effects of this application are as follows: This application provides a high-voltage bootstrap and drive circuit and its control method for a switching power converter, including a high-voltage bootstrap module and a control module. The high-voltage bootstrap module includes a first transistor, a second transistor, a first bootstrap capacitor, a second bootstrap capacitor, a first power transistor, and a second power transistor. The first and second transistors are used to charge the first and second bootstrap capacitors, thereby providing drive voltages for the first and second power transistors. The control module is used to output timing control signals according to the input signals to control the first and second transistors to turn on or off. This application uses active switches of the first and second transistors to replace diodes to charge the bootstrap capacitors, and provides reliable timing control for the first and second transistors through the control module. This eliminates unnecessary losses caused by voltage drops on the diodes, provides sufficient drive voltages for the power transistors, and improves conversion efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments of this application are described below. It should be understood that the drawings described below are only for the purpose of clearly illustrating some embodiments of the technical solutions in this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a structural block diagram of a high-voltage bootstrap and drive circuit for a switching power supply converter provided in one embodiment of this application; Figure 2 A circuit schematic diagram of a high-voltage bootstrap and drive circuit for a switching power supply converter provided in one embodiment of this application; Figure 3 This is a schematic diagram illustrating the steps of a control method for a high-voltage bootstrap and drive circuit of a switching power supply converter according to an embodiment of this application. Figure 4 A schematic diagram illustrating the switching mechanism of the high-voltage bootstrap and drive circuit in two operating states according to an embodiment of this application; Figure 5 This is a schematic diagram illustrating the working principle of working state one according to an embodiment of this application; Figure 6 This is a schematic diagram illustrating the working principle of working state two according to one embodiment of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0018] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various concepts, but unless otherwise stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words “if,” “when,” or “in response to a determination” as used herein may be interpreted as “when…” or “when…” or “in response to a determination.”

[0019] As used in this application, the terms "at least one", "multiple", "each", "any", etc., "at least one" includes one, two or more, "multiple" includes two or more, "each" refers to each of the corresponding multiples, and "any" refers to any one of the multiples.

[0020] In switching power converters, the power transistors used as switches require appropriate drive voltages to maintain normal on / off operation. In complex power supply topologies, the source terminals of power transistors may float between different power rails, necessitating the design of bootstrap circuits to ensure these floating power rail transistors have adequate drive voltages. However, existing bootstrap circuits directly charge the bootstrap capacitor using a series diode, resulting in an additional voltage drop across the diode, causing losses and insufficient drive voltage.

[0021] In view of this, embodiments of this application propose a high-voltage bootstrap and drive circuit and its control method for a switching power converter, including a high-voltage bootstrap module and a control module. The high-voltage bootstrap module includes a first transistor, a second transistor, a first bootstrap capacitor, a second bootstrap capacitor, a first power transistor, and a second power transistor. The first and second transistors are used to charge the first and second bootstrap capacitors, thereby providing drive voltages for the first and second power transistors. The control module is used to output timing control signals according to the input signal to control the first and second transistors to turn on or off. This application uses an active switch of the first and second transistors to replace the diode to charge the bootstrap capacitor, and provides reliable timing control for the first and second transistors through the control module, which can eliminate unnecessary losses caused by voltage drop across the diode, provide sufficient drive voltage for the power transistors, and improve conversion efficiency.

[0022] Reference Figure 1 , Figure 1 This is a structural block diagram of a high-voltage bootstrap and drive circuit for a switching power supply converter according to one embodiment of this application. The embodiment of this application proposes a high-voltage bootstrap and drive circuit for a switching power supply converter, comprising: A high-voltage bootstrap module includes a first transistor, a second transistor, a first bootstrap capacitor, a second bootstrap capacitor, a first power transistor, and a second power transistor. The first transistor and the second transistor are used to charge the first bootstrap capacitor and the second bootstrap capacitor, thereby providing a drive voltage for the first power transistor and the second power transistor. The control module, connected to the high-voltage bootstrap module, is used to output timing control signals based on the input signals to control the first and second transistors to turn on or off.

[0023] Specifically, the high-voltage bootstrap module includes a first power transistor M. S(i) Second power transistor M S(i+1) First bootstrap capacitor C BST(i) Second bootstrap capacitor C BST(i+1) , and the first transistor M that replaces the diode D1 Second transistor M D2 The control module outputs timing control signals (V). D1 and V D2 ), used to control the first transistor M D1 Second transistor M D2 .

[0024] It should be noted that in this embodiment, a MOSFET is used instead of a diode to charge the bootstrap capacitor, which can achieve zero-dropout conversion from the input power supply to the drive power supply, improve the drive voltage, and enhance the conversion efficiency. Furthermore, the control module provides reliable timing control for the charging MOSFET, accurately turning the MOSFET on and off, which can prevent reverse charging current. At the same time, its circuit structure is compatible with high-voltage design.

[0025] As a further optional implementation, the timing control signal includes a first timing control signal and a second timing control signal, and the control module includes: The first control module is connected to the gate of the first transistor and is used to output a first timing control signal according to the input signal to control the first transistor to be turned on or off. The second control module, connected to the gate of the second transistor, is used to output a second timing control signal according to the input signal, so as to control the second transistor to turn on or off.

[0026] Specifically, the first timing control signal V output by the first control module D1 Used to control the first transistor M D1 Turning the capacitor on or off, thus providing power to the first bootstrap capacitor C. BST(i) Charging; the second control module outputs the second timing control signal V. D2 Used to control the second transistor M D2 Turning the capacitor on or off, thus providing power to the second bootstrap capacitor C. BST(i+1) Charge.

[0027] Reference Figure 1 As a further optional implementation, the gates of both the first transistor and the second transistor are connected to the control module, the drain of the first transistor is connected to the input power supply, the drain of the second transistor, one end of the first bootstrap capacitor, and the control module are all connected to the source of the first transistor, the other end of the first bootstrap capacitor is connected to the source of the first power transistor, one end of the second bootstrap capacitor and the control module are both connected to the source of the second transistor, the other end of the second bootstrap capacitor is connected between the drain of the first power transistor and the source of the second power transistor, and the drain of the first power transistor is connected to the source of the second power transistor.

[0028] Reference Figure 2 , Figure 2This is a circuit schematic diagram of a high-voltage bootstrap and drive circuit for a switching power converter provided in one embodiment of this application. Further, as an optional implementation, the first control module includes a first NMOS transistor, a first PMOS transistor, a second NMOS transistor, and a second PMOS transistor. The gate of the first NMOS transistor is connected to the input signal, and the source of the first NMOS transistor is grounded. The drain of the first PMOS transistor, the gate of the second NMOS transistor, and the gate of the first transistor are all connected to the drain of the first NMOS transistor. The gate of the first PMOS transistor is connected between the drain of the second NMOS transistor and the source of the second PMOS transistor. The source of the first PMOS transistor is connected between the source of the first transistor and the drain of the second transistor. The source of the second NMOS transistor and the gate of the second PMOS transistor are both connected to the source of the first power transistor. The drain of the second NMOS transistor is connected to the source of the second PMOS transistor, and the drain of the second PMOS transistor is connected to the input power supply.

[0029] Reference Figure 2 As a further optional implementation, the second control module includes a third NMOS transistor, a third PMOS transistor, a fourth NMOS transistor, and a fourth PMOS transistor. The gate of the third NMOS transistor is connected to the gate of the first transistor, and the source of the third NMOS transistor is connected to the source of the first power transistor. The drain of the third PMOS transistor, the gate of the fourth NMOS transistor, and the gate of the second transistor are all connected to the drain of the third NMOS transistor. The gate of the third PMOS transistor is connected between the drain of the fourth NMOS transistor and the source of the fourth PMOS transistor. The source of the third PMOS transistor is connected to the source of the second transistor. The source of the fourth NMOS transistor and the gate of the fourth PMOS transistor are both connected to the source of the second power transistor. The drain of the fourth NMOS transistor is connected to the source of the fourth PMOS transistor, and the drain of the fourth PMOS transistor is connected to the source of the second transistor.

[0030] Understandable, Figure 2 Is Figure 1 The control module was expanded based on this, and the transistors were rearranged, but the connection relationship between the transistors was not changed.

[0031] Specifically, the first control module includes a first NMOS transistor M 11 The first PMOS transistor M 12 The second NMOS transistor M 13 and the second PMOS transistor M 14 These four transistors are used to generate voltage V. D1 (i.e., the first timing control signal); the second control module includes the third NMOS transistor M. 21 The third PMOS transistor M 22 The fourth NMOS transistor M 23 With the fourth PMOS transistor M24 These four transistors are used to generate voltage V. D2 (i.e., the second timing control signal). The first NMOS transistor M... 11 The gate connection input signal V PWM It is used to control the alternating working states of two phases.

[0032] As an optional implementation, the first NMOS transistor, the second PMOS transistor, and the second NMOS transistor and the first PMOS transistor are high-voltage MOS transistors with different voltage ratings.

[0033] As an optional implementation, the third NMOS transistor, the fourth PMOS transistor, and the fourth NMOS transistor and the third PMOS transistor are high-voltage MOS transistors with different voltage ratings.

[0034] Specifically, the first NMOS transistor M 11 The second PMOS transistor M 14 The third NMOS transistor M 21 and the fourth PMOS transistor M 24 LDMOS transistors with specific high voltages can be used according to design objectives to achieve stable control under high node voltage swings. The specific voltage rating of the MOSFET can be selected based on actual needs and is not limited here.

[0035] It should be noted that, by replacing some of the transistors in this embodiment with high-voltage MOS transistors of different withstand voltages, it can operate at high switching voltages without overvoltage problems, and can provide accurate and fast timing control signals under large node voltage swings.

[0036] Reference Figure 3 This application provides a control method for a high-voltage bootstrap and drive circuit of a switching power supply converter, used for control via the aforementioned high-voltage bootstrap and drive circuit of the switching power supply converter, including the following steps S101 to S102: Step S101: Charge the first bootstrap capacitor and the second bootstrap capacitor through the first transistor and the second transistor in the high voltage bootstrap module, thereby providing a drive voltage for the first power transistor and the second power transistor. Step S102: The control module outputs a timing control signal based on the input signal to control the first transistor and the second transistor to turn on or off.

[0037] As an optional implementation, the step of controlling the first and second transistors to turn on or off by outputting timing control signals according to the input signals through the control module can be specifically divided into the following steps S1021: When the input signal is at the first level, a first timing control signal at the second level is output to control the first transistor to turn on, and a second timing control signal at the first level is output to control the second transistor to turn off, thereby charging the first bootstrap capacitor.

[0038] Specifically, such as Figure 4 The diagram shows the switching mechanism of the high-voltage bootstrap and drive circuit in two operating states. Figure 5 The diagram shown illustrates the working principle of working state one. Figure 5 The image shows the status of all transistors under the operating conditions, with black transistors being on and gray transistors being off.

[0039] During this stage, the input signal V PWM When the voltage level is high (i.e., the first voltage level), the first NMOS transistor M... 11 Conduction; at the same time, V sw(i) It is pulled low to GND, therefore the second PMOS transistor M 14 Turning on the first PMOS transistor M... 12 Turn off, therefore the first timing control signal V D1 Outputting a low level (i.e., the second level) thereby controlling the first transistor M to turn on. D1 At this time, the input voltage V DRI Give the first bootstrap capacitor C BST(i) Charging. And the input signal V PWM Control the second power transistor M S(i+1) Conduction, therefore V SW(i+1) It was pulled up, V BST(i+1) Also pulled up, the third PMOS transistor M 22 On, the second timing control signal V D2 Raised to V BST(i+1) This allows the second transistor M to... D2 Turn off.

[0040] As a further optional implementation, the step of controlling the first transistor and the second transistor to turn on or off by outputting a timing control signal according to the input signal through the control module can be specifically divided into the following steps S1022: Step S1022: When the input signal is at the second level, output the first timing control signal at the first level to control the first transistor to turn off, and output the second timing control signal at the second level to control the second transistor to turn on, thereby charging the second bootstrap capacitor.

[0041] Specifically, such as Figure 4 The diagram shows the switching mechanism of the circuit between two operating states. Figure 6 The diagram shown illustrates the working principle of working state two. Figure 6The image shows the status of all transistors in operating state two, with black transistors being on and gray transistors being off.

[0042] During this stage, the input signal V PWM When the voltage level is low (i.e., the second voltage level), the first power transistor M... Si Conduction, therefore V sw(i) Increase to equal V SW(i+1) V BST(i) The rise causes the first PMOS transistor M to... 12 On, the first timing control signal V D1 Pulled up to equal V BST(i) This turns off the first transistor M. D1 ; and due to the first timing control signal V D1 Increase to equal V BST(i) Higher than V sw(i) The third NMOS transistor M 21 Turning on the signal pulls the second timing control signal V low. D2 To V SW(i) And equal to V SW(i+1) Therefore, the second transistor M D2 When the circuit is turned on, it becomes the second bootstrap capacitor C. BST(i+1) Charge.

[0043] It should be noted that, by Figure 5 and Figure 6 As can be seen, in the control module proposed in the embodiments of this application, the first NMOS transistor M 11 and the first PMOS transistor M 12 They will not conduct simultaneously; the second NMOS transistor M 13 / Second PMOS transistor M 14 The third NMOS transistor M 21 / Third PMOS transistor M 22 The fourth NMOS transistor M 23 / Fourth PMOS transistor M 24 Neither of them will be turned on at the same time, so it is essentially a voltage conversion without logic. It only has dynamic power consumption when switching states, and there is no DC path in steady state, so there is no static power consumption.

[0044] The structure, working principle, and control flow of the high-voltage bootstrap and drive circuit and its control method for a switching power supply converter according to the embodiments of this application have been described above. It can be recognized that the embodiments of this application have the following advantages compared with existing bootstrap circuits: First, by using a MOSFET instead of a diode to charge the bootstrap capacitor, zero-dropout conversion from input power to drive power can be achieved, eliminating unnecessary losses caused by voltage drop across the diode, providing sufficient drive voltage for the power transistor, and improving conversion efficiency.

[0045] Second, the control module provides reliable timing control for the charging MOSFET, accurately turning the MOSFET on and off to prevent reverse charging current; at the same time, the circuit structure is compatible with high voltage design, and by replacing some of the transistors with high voltage MOSFETs of different withstand voltages, it can operate at high conversion voltages without overvoltage problems.

[0046] Third, there is dynamic power consumption only during state transitions, while there is no DC path and no static power consumption in steady state.

[0047] In the foregoing description of this specification, the references to terms such as "one embodiment," "another embodiment," or "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

[0049] The above is a detailed description of the preferred embodiments of this application, but this application is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A high-voltage bootstrap and drive circuit for a switching power supply converter, characterized in that, include: A high-voltage bootstrap module includes a first transistor, a second transistor, a first bootstrap capacitor, a second bootstrap capacitor, a first power transistor, and a second power transistor. The first transistor and the second transistor are used to charge the first bootstrap capacitor and the second bootstrap capacitor, thereby providing a drive voltage for the first power transistor and the second power transistor. The control module, connected to the high-voltage bootstrap module, is used to output timing control signals according to the input signals to control the first transistor and the second transistor to turn on or off.

2. The circuit according to claim 1, characterized in that, The timing control signal includes a first timing control signal and a second timing control signal, and the control module includes: A first control module, connected to the gate of the first transistor, is used to output the first timing control signal according to the input signal, so as to control the first transistor to be turned on or off. The second control module is connected to the gate of the second transistor and is used to output the second timing control signal according to the input signal, so as to control the second transistor to be turned on or off.

3. The circuit according to claim 1, characterized in that, The gates of both the first transistor and the second transistor are connected to the control module. The drain of the first transistor is connected to the input power supply. The drain of the second transistor, one end of the first bootstrap capacitor, and the control module are all connected to the source of the first transistor. The other end of the first bootstrap capacitor is connected to the source of the first power transistor. One end of the second bootstrap capacitor and the control module are both connected to the source of the second transistor. The other end of the second bootstrap capacitor is connected between the drain of the first power transistor and the source of the second power transistor. The drain of the first power transistor is connected to the source of the second power transistor.

4. The circuit according to claim 2, characterized in that, The first control module includes a first NMOS transistor, a first PMOS transistor, a second NMOS transistor, and a second PMOS transistor. The gate of the first NMOS transistor is connected to the input signal, and the source of the first NMOS transistor is grounded. The drain of the first PMOS transistor, the gate of the second NMOS transistor, and the gate of the first transistor are all connected to the drain of the first NMOS transistor. The gate of the first PMOS transistor is connected between the drain of the second NMOS transistor and the source of the second PMOS transistor. The source of the first PMOS transistor is connected between the source of the first transistor and the drain of the second transistor. The source of the second NMOS transistor and the gate of the second PMOS transistor are both connected to the source of the first power transistor. The drain of the second NMOS transistor is connected to the source of the second PMOS transistor, and the drain of the second PMOS transistor is connected to the input power supply.

5. The circuit according to claim 2, characterized in that, The second control module includes a third NMOS transistor, a third PMOS transistor, a fourth NMOS transistor, and a fourth PMOS transistor. The gate of the third NMOS transistor is connected to the gate of the first transistor, and the source of the third NMOS transistor is connected to the source of the first power transistor. The drain of the third PMOS transistor, the gate of the fourth NMOS transistor, and the gate of the second transistor are all connected to the drain of the third NMOS transistor. The gate of the third PMOS transistor is connected between the drain of the fourth NMOS transistor and the source of the fourth PMOS transistor. The source of the third PMOS transistor is connected to the source of the second transistor. The source of the fourth NMOS transistor and the gate of the fourth PMOS transistor are both connected to the source of the second power transistor. The drain of the fourth NMOS transistor is connected to the source of the fourth PMOS transistor, and the drain of the fourth PMOS transistor is connected to the source of the second transistor.

6. The circuit according to claim 4, characterized in that, The first NMOS transistor, the second PMOS transistor, and the second NMOS transistor and the first PMOS transistor are high-voltage MOS transistors with different voltage ratings.

7. The circuit according to claim 5, characterized in that, The third NMOS transistor, the fourth PMOS transistor, and the third PMOS transistor are high-voltage MOS transistors with different voltage ratings.

8. A control method for a high-voltage bootstrap and drive circuit for a switching power supply converter, used for control via a high-voltage bootstrap and drive circuit for a switching power supply converter as described in any one of claims 1 to 7, characterized in that, Includes the following steps: The first and second transistors in the high-voltage bootstrap module charge the first and second bootstrap capacitors, thereby providing drive voltage for the first and second power transistors. The control module outputs timing control signals based on the input signals to control the first transistor and the second transistor to turn on or off.

9. The method according to claim 8, characterized in that, The control module outputs timing control signals based on the input signals to control the first transistor and the second transistor to turn on or off, specifically: When the input signal is at a first level, a first timing control signal at a second level is output to control the first transistor to turn on, and a second timing control signal at a first level is output to control the second transistor to turn off, thereby charging the first bootstrap capacitor.

10. The method according to claim 8, characterized in that, The control module outputs timing control signals based on the input signals to control the first transistor and the second transistor to turn on or off, specifically: When the input signal is at the second level, a first timing control signal at the first level is output to control the first transistor to turn off, and a second timing control signal at the second level is output to control the second transistor to turn on, thereby charging the second bootstrap capacitor.

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