Switching tube driving voltage control circuit and method and power converter

Abstract

The invention relates to a switching tube driving voltage control circuit and method and a power converter. The switch tube driving voltage control circuit in one aspect is used for being connected with each switch tube in the power converter and comprises a sampling circuit, a first feedback circuit, a power supply circuit and a driving circuit, and the first sampling circuit is used for sampling alternating current side voltage of a power conversion circuit to obtain target sampling voltage; the first feedback circuit is used for processing according to a first mapping relation based on the target sampling voltage to obtain a target feedback voltage; the power supply circuit is used for outputting target power supply voltage based on the target feedback voltage; and the driving circuit is used for outputting target driving voltage based on the target power supply voltage so as to drive conduction of the switching tube. By adopting the switching tube driving voltage control circuit, the conversion efficiency of the power converter can be improved.

Description

[0001] Related applications

[0002] This patent application is a divisional application of the Chinese patent application filed on October 23, 2024, with application number 202411487993X, and named "Switch tube drive voltage control circuit, method and power converter". Technical Field

[0003] The present application relates to the field of power conversion technology, and in particular to a switch tube drive voltage control circuit, method and power converter. Background Art

[0004] A power converter is a device used to convert electrical energy from one form to another, enabling energy transmission and control under varying power requirements. The operating principle of a power converter is to use a control circuit to continuously switch a switch on and off. The switch pulses the input voltage, achieving power conversion, such as DC-to-AC voltage conversion or DC-to-DC voltage conversion.

[0005] In the related art, the amplitude of the driving voltage for turning on the gate of the switching tube is fixed, resulting in low conversion efficiency of the power converter. Summary of the Invention

[0006] Based on this, it is necessary to provide a switch tube drive voltage control circuit, method and power converter that can improve the conversion efficiency of the power converter in order to address the above technical problems.

[0007] In a first aspect, the present application provides a switch tube drive voltage control circuit for connecting to each switch tube in a power converter. The switch tube drive voltage control circuit includes: a first sampling circuit, a first feedback circuit, a power supply circuit, and a drive circuit, wherein:

[0008] The first sampling circuit is used to sample the AC side voltage of the power conversion circuit to obtain a target sampling voltage;

[0009] The first feedback circuit is configured to process the target sampling voltage according to a first mapping relationship to obtain a target feedback voltage, wherein the first mapping relationship includes that an amplitude of the feedback voltage corresponding to the first sampling voltage is not greater than an amplitude of the feedback voltage corresponding to the second sampling voltage, and the amplitude of the first sampling voltage is greater than an amplitude of the second sampling voltage;

[0010] The power supply circuit is used to output a target power supply voltage based on the target feedback voltage, and the relationship between the amplitude of the target power supply voltage and the amplitude of the target feedback voltage is negatively correlated;

[0011] The driving circuit is used to output a target driving voltage based on a target power supply voltage to drive the switch tube to conduct, wherein the switching frequency of the switch tube varies with the amplitude of the AC side voltage.

[0012] In one embodiment, the first feedback circuit includes:

[0013] A first microcontroller, wherein an input end of the first microcontroller is connected to an output end of the sampling circuit, and an output end of the first microcontroller is connected to a feedback input end of the power supply circuit.

[0014] In one embodiment, the output of the first microcontroller includes a digital-to-analog output of the first microcontroller;

[0015] The first microcontroller is used to process the target sampling voltage according to a first mapping relationship and output the target feedback voltage through the digital-to-analog output terminal.

[0016] In one embodiment, the output terminal of the first microcontroller includes a duty cycle output terminal; the feedback circuit further includes a first filter circuit, the input terminal of the first filter circuit is connected to the duty cycle output terminal, and the output terminal of the first filter circuit is connected to the feedback input terminal of the power supply circuit;

[0017] The first microcontroller is used to process the target sampled voltage according to the first mapping relationship and output a first duty cycle voltage through the duty cycle output terminal;

[0018] The first filtering circuit is used to filter the first duty cycle voltage to obtain a target feedback voltage.

[0019] In one embodiment, the first mapping relationship includes a linear relationship between the amplitude of the feedback voltage and the amplitude of the sampling voltage.

[0020] In one embodiment, the first mapping relationship includes a nonlinear relationship between the amplitude of the feedback voltage and the amplitude of the sampling voltage.

[0021] In one embodiment, the first feedback circuit includes a rectifier circuit and a second filter circuit, wherein:

[0022] The rectifier circuit is used to rectify and phase-shift the target sampling voltage to obtain a rectified voltage;

[0023] The second filter circuit is used to filter and amplify the rectified voltage to obtain a target feedback voltage.

[0024] In one embodiment, the power supply circuit includes an auxiliary power chip, a first resistor, a second resistor, and a third resistor; wherein,

[0025] The output end of the auxiliary source chip is connected to the first end of the first resistor, and the feedback input end of the auxiliary source chip is connected to the second end of the first resistor, the first end of the second resistor, and the first end of the third resistor;

[0026] The second end of the second resistor is grounded;

[0027] The second end of the third resistor is connected to the output end of the feedback circuit.

[0028] In a second aspect, the present application provides a switch tube drive voltage control circuit for connecting to each switch tube in a power conversion circuit. The switch tube drive voltage control circuit includes: a second feedback circuit, a power supply circuit, and a drive circuit, wherein:

[0029] The second feedback circuit is used to obtain a target switching frequency of the switching tube, and process the target switching frequency according to a second mapping relationship to obtain a target feedback voltage, wherein the second mapping relationship includes that the amplitude of the feedback voltage corresponding to the first switching frequency is not less than the amplitude of the feedback voltage corresponding to the second switching frequency, and the first switching frequency is greater than the second switching frequency;

[0030] The power supply circuit is used to output a target power supply voltage based on the target feedback voltage, and the relationship between the amplitude of the target power supply voltage and the amplitude of the target feedback voltage is negatively correlated;

[0031] The driving circuit is used to output a target driving voltage based on the target power supply voltage to drive the switch tube to conduct, wherein the switching frequency of the switch tube varies with the amplitude of the AC side voltage of the power conversion circuit.

[0032] In one embodiment, the second feedback circuit includes a programmable logic device and a third filter circuit, the output end of the third filter circuit is connected to the digital output end of the programmable logic device, and the output end of the third filter circuit is connected to the feedback input end of the power supply circuit; wherein,

[0033] The programmable logic device is used to obtain the target switching frequency, perform processing according to the target switching frequency in accordance with the second mapping relationship, and output a second duty cycle voltage through the digital output terminal;

[0034] The third filtering circuit is used to filter the second duty cycle voltage to obtain a target feedback voltage.

[0035] In a third aspect, the present application further provides a method for controlling a switch tube drive voltage, comprising:

[0036] Obtaining a target sampling voltage corresponding to the AC side voltage of the power conversion circuit;

[0037] Mapping the target sampling voltage according to a first mapping relationship to obtain a target feedback voltage, wherein the first mapping relationship includes that the amplitude of the feedback voltage corresponding to the first sampling voltage is not greater than the amplitude of the feedback voltage corresponding to the second sampling voltage, and the amplitude of the first sampling voltage is greater than the amplitude of the second sampling voltage;

[0038] Among them, the target feedback voltage is used to determine the target driving voltage for driving the switch tube to turn on based on the target feedback voltage. The relationship between the amplitude of the target driving voltage and the amplitude of the target feedback voltage is negatively correlated, and the switching frequency of the switch tube changes with the amplitude of the AC side voltage.

[0039] In a fourth aspect, the present application further provides a method for controlling a switch tube driving voltage, comprising:

[0040] Obtaining the target switching frequency of the power conversion circuit switch tube;

[0041] The target switching frequency is processed according to a second mapping relationship to obtain a target feedback voltage, wherein the second mapping relationship includes that the amplitude of the feedback voltage corresponding to the first switching frequency is not less than the amplitude of the feedback voltage corresponding to the second switching frequency, and the first switching frequency is greater than the second switching frequency;

[0042] Among them, the target feedback voltage is used to determine the target driving voltage for driving the switching tube to turn on based on the target feedback voltage. The relationship between the amplitude of the target driving voltage and the amplitude of the target feedback voltage is negatively correlated, and the switching frequency of the switching tube changes with the amplitude of the AC side voltage of the power conversion circuit.

[0043] In a fifth aspect, the present application further provides a power converter, the power converter comprising the switch tube drive voltage control circuit and the power conversion circuit according to the first aspect or the second aspect;

[0044] The switch tube driving voltage control circuit is connected to the driving end of each switch tube in the power conversion circuit.

[0045] The switch tube drive voltage control circuit, method, and power converter provided above, in one aspect, is a switch tube drive voltage control circuit for connecting to each switch tube in a power conversion circuit, comprising: a first sampling circuit, a first feedback circuit, a power supply circuit, and a drive circuit, wherein the first sampling circuit is used to sample and process the AC side voltage of the power conversion circuit to obtain a target sampled voltage; the first feedback circuit is used to process according to a first mapping relationship based on the target sampled voltage to obtain a target feedback voltage, wherein the first mapping relationship includes that the amplitude of the feedback voltage corresponding to the first sampled voltage is not greater than the amplitude of the feedback voltage corresponding to the second sampled voltage, and the amplitude of the first sampled voltage is greater than the amplitude of the second sampled voltage; the power supply circuit is used to output a target power supply voltage based on the target feedback voltage, and the relationship between the amplitude of the target power supply voltage and the amplitude of the target feedback voltage is negatively correlated; the drive circuit Used to output a target driving voltage based on a target power supply voltage to drive the conduction of the switching tube, wherein the switching frequency of the switching tube varies with the amplitude of the AC side voltage; in this way, by sampling the AC side voltage of the power conversion circuit, a first processing is performed through the first feedback circuit to obtain a feedback voltage that is negatively correlated with the first sampling voltage as a whole, and then a power supply circuit with a feedback voltage control function is used to perform a second processing based on the target feedback voltage to obtain a target power supply voltage that is negatively correlated with the target feedback voltage. In this way, a positive correlation is established between the AC side voltage amplitudes of the driving circuit and the power conversion circuit through the first sampling circuit, the first feedback circuit and the power supply circuit, so that the target driving voltage output by the driving circuit for driving the switching tube can be dynamically adjusted following the positive correlation of the AC side voltage amplitude, dynamically reducing the driving loss and conduction loss, and improving the conversion efficiency of the power converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 is a structural block diagram of a switch drive voltage control circuit in one embodiment;

[0048] Figure 2 is a structural block diagram of a switch drive voltage control circuit in another embodiment;

[0049] Figure 3 is a structural block diagram of a switch drive voltage control circuit in another embodiment;

[0050] Figure 41 is an exemplary schematic diagram of voltage waveforms of the AC side voltage and the driving voltage in one embodiment;

[0051] Figure 5 1 is an exemplary schematic diagram of voltage waveforms of the AC side voltage, feedback voltage, and drive voltage in one embodiment;

[0052] Figure 6 is a structural block diagram of a switch drive voltage control circuit in another embodiment;

[0053] Figure 7 is a structural block diagram of a switch drive voltage control circuit in another embodiment;

[0054] Figure 8 is a structural block diagram of a switch drive voltage control circuit in another embodiment;

[0055] Figure 9 1 is a flow chart of a switch driving voltage control method according to an embodiment;

[0056] Figure 10 is a flow chart of a switch driving voltage control method according to another embodiment;

[0057] Figure 11 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0060] It will be understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor without departing from the scope of this application. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0061] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0062] It should be understood that the term "based on" as used herein is used to describe one or more factors that influence a determination, and does not exclude other factors that may influence the determination. For example, the phrase "determine A based on B" means that the determination of A may be based entirely or at least partially on factor B. In other words, B is a factor that influences the determination of A, but does not exclude the determination of A being based on C as well.

[0063] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0064] The switch drive voltage control circuit provided in the embodiments of the present application is used in a power converter in which the switch tube is actively driven. Exemplarily, the power converter is a DC-AC converter using a dual active bridge (DAB) topology. The DAB DC-AC converter is a power conversion topology with a dual active bridge, comprising eight power tubes, four of which form a full-bridge circuit on the DC side, and the remaining four form a half-bridge circuit on the AC side.

[0065] Among them, the switching tube can also be called a power tube; the switching tube involved in the embodiments of the present application is a voltage-driven switching tube, including but not limited to MOS tube (Metal-Oxide-Semiconductor Field-Effect Transistor) and IGBT (Insulated Gate Bipolar Transistor).

[0066] The principle underlying the switch tube drive voltage control circuit provided in this embodiment is first introduced to facilitate a clear understanding of this solution.

[0067] Taking a MOS transistor as an example, a MOS transistor is turned on when the gate drive voltage reaches its turn-on threshold. Within the MOS transistor's tolerance range, a higher gate drive voltage reduces the MOS transistor's on-resistance and, consequently, its conduction losses. However, a higher drive voltage also requires the MOS transistor's drive circuit to provide more energy, resulting in greater drive losses. The applicant, through extensive experimental research, has found that MOS transistor conduction losses become more pronounced when the power converter's output power (i.e., output current) is higher, and drive losses become more pronounced at higher switching frequencies.

[0068] In a power converter that actively drives the switching tube, the control logic of the power converter determines that the greater the AC side voltage amplitude, the greater the instantaneous power of the power converter and the lower the switching frequency of the switching tube. When the AC side voltage is near the peak point, the output power of the power converter is high and the switching frequency of the MOS tube is low. When the AC side voltage is near the zero point, the output power of the power converter is low and the switching frequency of the MOS tube is high. Taking a micro-inverter based on a DAB topology in a grid-connected working state as an example, near the peak point of the grid voltage, the switching frequency of each MOS tube in the micro-inverter is low, while the output power of the power converter is high. Near the zero point of the grid voltage, the switching frequency of each MOS tube in the inverter is high, and the output power of the power converter is low. That is, within an AC cycle, the switching frequency of the MOS tube is negatively correlated with the absolute value of the AC side voltage, and the operating current of the MOS tube is positively correlated with the absolute value of the AC side voltage.

[0069] Based on this, the present application provides a switch tube drive voltage control circuit through the following embodiments, which increases the drive voltage when the amplitude of the AC side voltage is high. At this time, the switching frequency of the MOS tube is low and the driving loss is not obvious, and the conduction current is high and the conduction loss is more obvious. Combined with the fact that the higher the drive voltage, the smaller the conduction loss and the greater the drive loss, the overall loss of the MOS tube is small and the power converter efficiency is high; when the amplitude of the AC side voltage is low, the drive voltage is reduced. At this time, the switching frequency of the MOS tube is high and the driving loss is more obvious, and the conduction current is small and the conduction loss is not obvious. Combined with the characteristics that the lower the drive voltage, the greater the conduction loss and the smaller the drive loss, the overall loss of the MOS tube is small and the power converter efficiency is high; in this way, the conduction loss and driving loss of the MOS tube are dynamically reduced, the overall loss of the power conversion circuit is reduced, and ultimately the efficiency of the power converter is improved.

[0070] In an exemplary embodiment, the provided switch tube driving voltage control circuit 100 is used to connect to each switch tube in the power conversion circuit. Figure 1 The switch tube driving voltage control circuit 100 includes a first sampling circuit 110 , a first feedback circuit 120 , a power supply circuit 130 and a driving circuit 140 .

[0071] The first sampling circuit 110 is used to sample the AC side voltage of the power conversion circuit to obtain a target sampling voltage.

[0072] Exemplarily, the AC side of the power converter can be connected to the grid, and the AC side voltage is the grid voltage; exemplary, the AC side of the power converter can also be connected to an AC load, and the AC side voltage is the load voltage.

[0073] Exemplarily, the first sampling circuit 110 may include a current transformer and a resistor, configured to sample the AC side current at a ratio of 1:N and then convert the current into a target sampled voltage via the resistor. N is the transformation ratio of the current transformer. Furthermore, exemplary, the first sampling circuit 110 may include a voltage sampling chip.

[0074] The first feedback circuit 120 is configured to process the target sampled voltage according to a first mapping relationship to obtain a target feedback voltage. The first mapping relationship includes the following: the amplitude of the feedback voltage corresponding to the first sampled voltage is not greater than the amplitude of the feedback voltage corresponding to the second sampled voltage, and the amplitude of the first sampled voltage is greater than the amplitude of the second sampled voltage. The power supply circuit 130 is configured to output a target power supply voltage based on the target feedback voltage; the amplitude of the target power supply voltage is negatively correlated with the amplitude of the target feedback voltage. The driver circuit 140 is configured to output a target drive voltage based on the target power supply voltage to turn on the switch. The switching frequency of the switch varies with the amplitude of the AC side voltage. Specifically, a greater amplitude of the AC side voltage increases the instantaneous power of the power conversion circuit and decreases the switching frequency. The driver circuit 140 is connected to the power conversion circuit 200 in the power converter to provide a drive voltage for each switch in the power conversion circuit 200. Exemplarily, the power conversion circuit 200 is a DAB topology circuit.

[0075] For example, the driving circuit 140 may be connected to a programmable logic device in the power converter to control the switching frequency of each switch tube.

[0076] The input end of the first feedback circuit 120 is connected to the first sampling circuit 110 , and the output end of the first feedback circuit 120 is connected to the feedback input end of the power circuit 130 , so that the power circuit 130 can adjust the output voltage of the power circuit 130 based on the output of the first feedback circuit 120 .

[0077] The target feedback voltage is obtained by processing the target sampling voltage according to a first mapping relationship. The target feedback voltage and the target sampling voltage have opposite changing trends, i.e., the larger the amplitude of the sampling voltage, the smaller the amplitude of the feedback voltage. The amplitude of the target power supply voltage is negatively correlated with the amplitude of the target feedback voltage, i.e., the smaller the target feedback voltage, the larger the target power supply voltage. Thus, after the first feedback circuit 120 and the power supply circuit 130, the amplitude of the target power supply voltage input to the driver circuit 140 is positively correlated with the amplitude of the target sampling voltage, so that the amplitude of the target driving voltage output by the driver circuit 140 to the switching tube is positively correlated with the amplitude of the target sampling voltage. This ensures that when the amplitude of the AC side voltage is large, the driving voltage of the switching tube is large, and when the amplitude of the AC side voltage is small, the driving voltage of the switching tube is low, thereby dynamically reducing the conduction loss and driving loss of the MOS tube.

[0078] The first sampling voltage and the second sampling voltage refer to any two voltages of different amplitudes that can be output by the first sampling circuit 110. The first sampling voltage refers to a sampling voltage with a larger amplitude, and the second sampling voltage refers to a sampling voltage with a smaller amplitude. In the embodiments of the present application, the first sampling voltage and the second sampling voltage are used to illustrate the mapping relationship between the sampling voltage and the feedback voltage included in the first mapping relationship.

[0079] In one possible implementation, the first mapping relationship includes a linear relationship between the amplitude of the feedback voltage and the amplitude of the sampling voltage. In this implementation, the first mapping relationship includes the amplitude of the feedback voltage corresponding to the first sampling voltage being smaller than the amplitude of the feedback voltage corresponding to the second sampling voltage, and the amplitude of the first sampling voltage being larger than the amplitude of the second sampling voltage. That is, the first mapping relationship means that the larger the sampling voltage, the smaller the amplitude of the feedback voltage.

[0080] For example, the first mapping relationship is V o =AB*|V ac |, where V o Represents the feedback voltage, V ac represents the sampling voltage, and A and B are pre-set mapping parameters. For example, A = 2.35 and B = 0.00163. The mapping parameters A and B in this example were obtained by the applicant based on the hardware parameters of the power supply circuit used in the experiment, the electrical characteristics of the switch tube, and actual experimental results. This does not limit the mapping parameters. It is understood that those skilled in the art can determine the mapping parameters based on specific implementation conditions, including but not limited to the hardware parameters of the power supply circuit and / or the electrical characteristics of the switch tube.

[0081] In one possible implementation, the first mapping relationship includes a nonlinear relationship between the amplitude of the feedback voltage and the amplitude of the sampled voltage. In this implementation, the amplitude of the sampled voltage is divided into multiple amplitude intervals, each amplitude interval corresponding to a different feedback voltage, and sampled voltages within the same amplitude interval correspond to the same feedback voltage; overall, the sampled voltage and feedback voltage are negatively correlated. Exemplarily, the first mapping relationship includes a piecewise function. In another exemplary embodiment, the first mapping relationship includes a list mapping relationship.

[0082] In one possible implementation, the first feedback circuit 120 is implemented using a pure hardware circuit. In another possible implementation, the first feedback circuit 120 includes a first microcontroller 121, that is, implemented by combining software and hardware. The full name of the microcontroller is Microcontroller Unit, or MCU.

[0083] The power supply circuit 130 adjusts the output power supply voltage based on the input feedback voltage. The larger the amplitude of the input feedback voltage, the smaller the amplitude of the output power supply voltage, and the smaller the amplitude of the input feedback voltage, the smaller the amplitude of the output power supply voltage. This power supply voltage refers to the power supply voltage input to the drive circuit 140.

[0084] In one possible implementation, please refer to Figure 2 and Figure 3 The power supply circuit 130 includes an auxiliary power chip 131 with voltage feedback characteristics and a peripheral circuit corresponding to the auxiliary power chip 131. Figure 2 and Figure 3 In, V out is the power supply voltage output by the power supply circuit 130, V o Refers to the feedback voltage, FB refers to the feedback pin of the auxiliary power chip 131. Figure 2 and Figure 3 The peripheral circuit includes a first resistor R1, a second resistor R2 and a third resistor R FB The output end of the auxiliary source chip 131 is connected to the first end of the first resistor R1, and the feedback input end of the auxiliary source chip 131 is connected to the second end of the first resistor R1, the first end of the second resistor R2 and the third resistor R FB A first end of the second resistor R2 is connected to a first end of the first feedback circuit 120, a second end of the second resistor R2 is grounded, and a second end of the third resistor R3 is connected to the output end of the first feedback circuit 120.

[0085] The power supply voltage V output by the power supply circuit 130 out Under the regulation of the feedback pin voltage, the gate drive voltage can be provided to the MOS transistor through the drive circuit 140.

[0086] Exemplarily, the auxiliary power chip 131 is a BUCK (step-down) power chip.

[0087] The switch tube drive voltage control circuit 100 provided in the above embodiment is used to connect to each switch tube in the power converter, including: a first sampling circuit 110, a first feedback circuit 120, a power supply circuit 130 and a drive circuit 140, wherein the first sampling circuit 110 is used to sample and process the AC side voltage of the power conversion circuit to obtain a target sampled voltage; the first feedback circuit 120 is used to process according to a first mapping relationship based on the target sampled voltage to obtain a target feedback voltage, wherein the first mapping relationship includes that the amplitude of the feedback voltage corresponding to the first sampled voltage is not greater than the amplitude of the feedback voltage corresponding to the second sampled voltage, and the amplitude of the first sampled voltage is greater than the amplitude of the second sampled voltage; the power supply circuit 130 is used to output a target power supply voltage based on the target feedback voltage, and the relationship between the amplitude of the target power supply voltage and the amplitude of the target feedback voltage is negatively correlated; the drive circuit 140 is used to generate a target feedback voltage based on the target voltage. The target driving voltage is outputted to drive the conduction of the switch tube, wherein the switching frequency of the switch tube varies with the amplitude of the AC side voltage. In this way, by sampling the AC side voltage of the power conversion circuit, the first feedback circuit 120 performs a first processing to obtain a feedback voltage that is negatively correlated with the sampled voltage as a whole, and then the power supply circuit 130 with a feedback voltage control function performs a second processing based on the target feedback voltage to obtain a target power supply voltage that is negatively correlated with the target feedback voltage. In this way, a positive correlation between the driving voltage and the amplitude of the AC side voltage of the power conversion circuit is established through the first sampling circuit 110, the first feedback circuit 120 and the power supply circuit 130, so that the target driving voltage output by the driving circuit 140 for driving the switch tube can be dynamically adjusted following the positive correlation of the AC side voltage amplitude, thereby dynamically reducing the driving loss and conduction loss, and improving the conversion efficiency of the power converter.

[0088] For example, the switch tube driving voltage control circuit 100 provided in the above embodiment is applied to the micro inverter grid-connected operation process based on the DAB topology structure, please refer to Figure 4 At the grid voltage peak point A, the switching frequency of the switch tube is low, the output current is large, and the conduction loss accounts for the main factor. The driving voltage is increased to reduce the conduction loss. At the grid voltage zero point B, the switching frequency of the MOS tube is high, the output current of the micro inverter is small, and the driving loss accounts for the main factor. The driving voltage is reduced to reduce the driving loss.

[0089] Please refer to Figure 5 , which is an exemplary schematic diagram of the changing trends among the AC side voltage, feedback voltage, and drive voltage. When the first mapping relationship is nonlinear, the waveforms of the feedback voltage and the drive voltage can be step-shaped, and the changing trend of the feedback voltage is opposite to the changing trend of the AC side voltage amplitude.

[0090] In an exemplary embodiment, please refer to Figure 2 and Figure 3 ,based on Figure 1 In the illustrated embodiment, the first feedback circuit 120 in the switch tube drive voltage control circuit 100 includes a first microcontroller 121. The input end of the first microcontroller 121 is connected to the output end of the first sampling circuit 110, and the output end of the first microcontroller 121 is connected to the feedback input end of the power supply circuit 130.

[0091] In one possible implementation, please refer to Figure 2 The output of the first microcontroller 121 includes a digital-to-analog (DA) output terminal of the first microcontroller 121 , namely, a DA (Digital-to-Analog) pin. In this embodiment, the first microcontroller 121 processes the target sampled voltage according to a first mapping relationship and outputs a target feedback voltage via the DA output terminal. The target feedback voltage is an analog signal.

[0092] In this embodiment, the DA pin on the first microcontroller 121 is used to directly output the target feedback voltage in the form of an analog signal, without the need for an additional filtering circuit, resulting in low hardware cost and simple circuit topology.

[0093] In one possible implementation, please refer to Figure 3 The output terminal of the first microcontroller 121 includes a duty cycle output terminal, and the first feedback circuit 120 further includes a first filter circuit. The input terminal of the first filter circuit is connected to the duty cycle output terminal, and the output terminal of the first filter circuit is connected to the input terminal of the first feedback circuit 120. The first microcontroller 121 is configured to process the target sampled voltage according to a first mapping relationship and output a first duty cycle voltage through the duty cycle output terminal; the first filter circuit is configured to filter the first duty cycle voltage to obtain a target feedback voltage.

[0094] For example, please refer to Figure 3 , the first filtering circuit includes an RC (resistance-capacitance) filtering circuit. Figure 3 As shown, the first filtering circuit includes a resistor R3 and a capacitor C1.

[0095] Exemplarily, the duty cycle output terminal of the first microcontroller 121 may be a general purpose input output (GPIO) pin of the first microcontroller 121. Another exemplary embodiment, the duty cycle output terminal of the first microcontroller 121 may be a PWM (Pulse Width Modulator) output pin of the first microcontroller 121, such as Figure 3 shown.

[0096] The first duty cycle voltage outputted from the duty cycle output terminal is in the form of a PWM wave, that is, a digital signal, which is converted into a target feedback voltage in the form of an analog signal by the first filtering circuit.

[0097] In this embodiment, the duty cycle output terminal of the first microcontroller 121 is used to first output a first duty cycle voltage in digital form, and then the first filter circuit filters the first duty cycle voltage into an analog target feedback voltage. This can reduce the resource usage of the first microcontroller 121 and avoid insufficient DA pin resources on the first microcontroller 121. Furthermore, the switch tube drive voltage control circuit 100 provided in this embodiment can be implemented on a first microcontroller 121 that does not have a DA pin, thereby improving the flexibility of the solution application.

[0098] The switch tube drive voltage control circuit 100 provided in the above embodiment implements the first feedback circuit 120 based on the first microcontroller 121. The first microcontroller 121 can read the real-time status of the AC side voltage of the power converter through the first sampling circuit 110, connect to the feedback input terminal of the power supply circuit 130, and inject feedback voltage into the power supply circuit 130 to adjust the power supply voltage output by the power supply circuit 130. This embodiment realizes the mapping of the sampling voltage to the feedback voltage through the first microcontroller 121 combined with software, with high accuracy. The specific parameters in the first mapping relationship can be flexibly adjusted according to the hardware parameters of the switch tube of the power conversion part in the power converter or the hardware parameters corresponding to the power supply circuit 130. The switch tube drive voltage control circuit 100 provided in this embodiment has good scalability.

[0099] In one possible implementation of this embodiment, the first microcontroller 121 can automatically adjust the target driving voltage to find the highest efficiency point. For example, based on the waveform of the target power supply voltage currently output by the driving circuit 140, a corresponding closed-loop control algorithm is set in the first microcontroller 121 to calculate the current efficiency of the power converter so that the driving voltage is within a safe range and the optimal target driving voltage is found by itself; for example, the target driving voltage can be adjusted to the maximum efficiency point. Figure 4 The maximum and minimum amplitudes of the driving voltage waveform in .

[0100] In a possible implementation of this embodiment, the first mapping relationship includes a first mapping relationship A and a first mapping relationship B, which correspond to different switching tubes respectively. It can be understood that the mapping parameters in the first mapping relationship A and the first mapping relationship B are determined based on the electrical characteristics of different switching tubes; the first feedback circuit 120 based on the first microcontroller 121 can determine to switch the mapping relationship currently required to be used from the first mapping relationship A and the first mapping relationship B based on the characteristics of the AC side voltage; or, the first feedback circuit 120 based on the first microcontroller 121 can switch the mapping relationship currently to be used in response to user input; further, the first mapping relationship can include multiple different first mapping relationships, and the first microcontroller 121 is used to switch the required mapping relationship in specific use, thereby improving the scalability of the switching tube driving voltage circuit.

[0101] In one possible implementation of this embodiment, the first microcontroller 121 is further configured to, in the process of processing the target sampled voltage according to the first mapping relationship to obtain the target feedback voltage, specifically to obtain an initial feedback voltage based on the target sampled voltage and the first mapping relationship; if the amplitude of the initial feedback voltage is greater than or equal to a preset feedback voltage threshold, use the initial feedback voltage as the target feedback voltage; and if the initial feedback voltage is greater than the preset feedback voltage threshold, obtain the target feedback voltage based on the preset feedback voltage threshold. In this way, when the AC side voltage abnormally increases, such as when the grid voltage experiences a high voltage breakover or cumulative surge, the target feedback voltage output by the first feedback circuit 120 will not be too small, and the target power supply voltage output by the power supply circuit 130 will not be too large. This is equivalent to setting an upper limit on the driving voltage of the switching tube, thereby improving the safety of circuit operation.

[0102] In an exemplary embodiment, please refer to Figure 6 The first feedback circuit 120 in the provided switch drive voltage control circuit includes a rectifier circuit 122 and a second filter circuit 123, wherein the rectifier circuit 122 is used to rectify and phase-shift the target sampling voltage to obtain a rectified voltage; the second filter circuit 123 is used to filter and amplify the rectified voltage to obtain a target feedback voltage.

[0103] Exemplarily, the rectifier circuit 122 includes a full-bridge rectifier circuit consisting of four diodes and a phase shift circuit.

[0104] Among them, the full-bridge rectifier circuit rectifies the target sampling voltage to obtain a waveform with the same amplitude change as the AC side voltage. In order to obtain a rectified voltage with a changing trend opposite to that of the AC side voltage, the phase shifter circuit shifts the phase of the rectified voltage by 180° or an integer multiple of 180°.

[0105] Exemplarily, the second filter circuit 123 includes an RC filter circuit and an amplifier circuit, wherein the RC filter circuit filters and smoothes the sorted voltage to obtain a filtered voltage of the analog signal waveform, and the amplifier circuit amplifies the filtered voltage and adjusts the amplitude of the filtered voltage to obtain a target feedback voltage determined by the first mapping relationship. The amplification factor of the amplifier circuit can be greater than 1 or less than 1. Exemplarily, the amplification factor can be determined based on the electrical parameter characteristics of the auxiliary source chip, the rectifier circuit 122, and the switching tube used in the power supply circuit 130.

[0106] In one possible implementation, the rectifier circuit 122 includes, in addition to a full-bridge rectifier circuit and a phase-shift circuit, an isolation circuit. The input of the isolation circuit is connected to the output of the first sampling circuit 110, and the output of the isolation circuit is connected to the full-bridge rectifier circuit. Exemplarily, the isolation circuit includes two inverters connected in series.

[0107] In this embodiment, the use of the isolation circuit can prevent related interference between the first sampling circuit 110 and the rectifier circuit 122, thereby improving the reliability of the switch drive voltage control circuit.

[0108] In an exemplary embodiment, the first feedback circuit 120 includes a step-down circuit, a rectifier circuit, and a filter circuit. The voltage amplitude on the AC side of the power converter is generally 0V-390V, which is relatively large. In this embodiment, the sampled target AC voltage is first stepped down by the step-down circuit to obtain a stepped-down voltage, which is then rectified, phase-shifted, and filtered.

[0109] In an exemplary embodiment, please refer to Figure 7 , a switch tube driving voltage control circuit 300 is provided for connecting to each switch tube in the power conversion circuit 200. Figure 7 As shown, the switch tube drive voltage control circuit 300 includes a second feedback circuit 310, a power supply circuit 130, and a drive circuit 140. It will be understood that the switch tube drive voltage control circuit 300 provided in this embodiment and the switch tube drive voltage control circuit 300 provided in the previous embodiment use different feedback circuit topologies, but the same power supply circuit topologies and drive circuit topologies.

[0110] The second feedback circuit 310 is used to obtain the target switching frequency of the switch tube and process it according to the second mapping relationship based on the target switching frequency to obtain a target feedback voltage; the second mapping relationship includes that the amplitude of the feedback voltage corresponding to the first switching frequency is not less than the amplitude of the feedback voltage corresponding to the second switching frequency, and the first switching frequency is greater than the second switching frequency. The switching frequency of the switch tube varies with the amplitude of the AC side voltage of the power conversion circuit. Specifically, the greater the amplitude of the AC side voltage, the greater the instantaneous power of the power conversion circuit and the lower the switching frequency. The power supply circuit 130 is used to output a target power supply voltage based on the target feedback voltage, and the relationship between the amplitude of the target power supply voltage and the amplitude of the target feedback voltage is negatively correlated. The drive circuit 140 is used to output a target drive voltage based on the target power supply voltage to drive the switch tube to conduct.

[0111] In one possible implementation, the second mapping relationship includes a linear relationship between the switching frequency and the amplitude of the sampled voltage. In this implementation, the second mapping relationship includes the amplitude of the feedback voltage corresponding to the first switching frequency being greater than the amplitude of the feedback voltage corresponding to the second switching frequency. That is, the second mapping relationship indicates that the amplitude of the feedback voltage decreases when the switching frequency is lower.

[0112] In one possible embodiment, the second mapping relationship includes a nonlinear relationship between the switching frequency and the amplitude of the sampled voltage. In this embodiment, the switching frequency is numerically divided into multiple frequency intervals, each frequency interval corresponding to a different feedback voltage, and the switching frequency within the same frequency interval corresponds to the same feedback voltage. In this embodiment, there is a situation where the switching frequency changes while the amplitude of the feedback voltage remains unchanged. Overall, the switching frequency and feedback voltage have a positive correlation. Exemplarily, the second mapping relationship includes a piecewise function; another exemplary embodiment, the second mapping relationship includes a list mapping relationship.

[0113] The switching frequency of each switch tube in the power conversion circuit 200 in this embodiment varies with the amplitude of the AC side voltage of the power conversion circuit. When the amplitude of the AC side voltage is large, the switching frequency of the switch tube is low, such as near the peak of the AC side voltage, the switching frequency of the switch tube is the lowest; when the amplitude of the AC side voltage is small, the switching frequency of the switch tube is high, such as near the zero point of the AC side voltage, the switching frequency of the switch tube is the highest; based on this, this embodiment directly adjusts the amplitude of the driving voltage of the switch tube according to the switching frequency of the switch tube, that is, the second feedback circuit 310 directly obtains the switching frequency for controlling the switch tube, and outputs the feedback voltage according to the switching frequency, and adjusts the power supply voltage output by the power supply circuit 130 so that the driving voltage is The driving voltage output by the circuit 140 changes with the switching frequency of the switching tube; wherein, the switching frequency is processed for the first time by the second feedback circuit 310 to obtain a feedback voltage that is positively correlated with the switching frequency, and then a power supply circuit 130 with a feedback voltage control function is used to perform a second processing based on the feedback voltage to obtain a power supply voltage that is negatively correlated with the feedback voltage. A negative correlation is established between the driving voltage and the switching frequency of the switching tube of the power conversion circuit through the second feedback circuit 310 and the power supply circuit 130, so that the target driving voltage output by the driving circuit 140 for driving the switching tube can be dynamically adjusted with the negative correlation of the switching frequency of the switching tube, dynamically reducing the driving loss and conduction loss, and improving the conversion efficiency of the power converter.

[0114] In an exemplary embodiment, based on Figure 7 For the examples shown, please refer to Figure 8 The second feedback circuit includes a programmable logic device 311 and a third filtering circuit; the output end of the third filtering circuit is connected to the digital output end of the programmable logic device, and the output end of the third filtering circuit is connected to the feedback input end of the power supply circuit 130.

[0115] The programmable logic device 311 is configured to obtain a target switching frequency, perform processing based on the target switching frequency according to a second mapping relationship, and output a second duty cycle voltage through a digital output terminal. The programmable logic device 311 is further configured to process the AC side voltage of the power conversion circuit to obtain a switching frequency of the switch.

[0116] Exemplarily, the programmable logic device 311 is implemented using a CPLD (Complex Programmable Logic Device). In another exemplary embodiment, the programmable logic device 311 is implemented using an FPGA (Field Programmable Gate Array).

[0117] In one possible implementation, please refer to Figure 8The input end of the programmable logic device 311 is used to connect to the output end of the second microcontroller 410, the input end of the second microcontroller 410 is connected to the output end of the second sampling circuit 420, and the input end of the second sampling circuit 420 is connected to the AC side output end of the power conversion circuit 200, and is used to sample the AC side voltage of the power conversion circuit 200; the second microcontroller 410 is used to process the AC side voltage output by the second sampling circuit 420, and output the AC side voltage in the form of a digital signal, so that the programmable logic device 311 can process the AC side voltage in the form of a digital signal to obtain the switching frequency of the switch tube.

[0118] The third filter circuit is used to filter the second duty cycle voltage to obtain the target feedback voltage. In one possible implementation, the third filter circuit has the same topology as the first filter circuit, and is a sampling RC filter circuit, such as Figure 8 As shown, the third filtering circuit includes a resistor R4 and a capacitor C2. In this embodiment, the third filtering circuit converts the second duty cycle voltage outputted by the digital output terminal of the programmable logic device 311 into a target feedback voltage in the form of an analog signal.

[0119] The second feedback circuit in the switch tube drive voltage control circuit provided in the above embodiment is implemented using a programmable logic device 311 for calculating the switching frequency and a third filter circuit. There is no need to separately set up a sampling circuit and a processing device for the second feedback circuit, which simplifies the circuit structure and improves the processing efficiency of the second feedback circuit.

[0120] In an exemplary embodiment, the second feedback circuit 310 includes a third microcontroller, wherein the third microcontroller is configured to obtain the switching frequency of the switch. Exemplarily, the third microcontroller is configured to be connected to the output of a programmable logic device. In this embodiment, the programmable logic device is configured to determine the switching frequency of the switch based on the AC side voltage. The output of the programmable logic device is connected to each switch in the power conversion circuit and to the input of the third microcontroller.

[0121] Optionally, the output terminal of the third microcontroller includes a digital-to-analog output terminal, and the digital-to-analog output terminal of the third microcontroller is connected to the feedback input terminal of the power supply circuit 130. The third microcontroller is configured to perform processing according to the second mapping relationship based on the target switching frequency and output the target feedback voltage through the digital-to-analog output terminal.

[0122] In a possible implementation of this embodiment, the third microcontroller and Figure 8 The second microcontroller in is the same controller.

[0123] In an exemplary embodiment, a method for controlling a switch tube driving voltage is provided; in this embodiment, the method is used to Figures 2 to 3The first microcontroller 121 in the embodiment is used as an example for explanation. It is understandable that the method provided in this embodiment can also be used in other controllers or computer devices connected to the power supply circuit 130 and the first sampling circuit 110. Figure 9 , the method includes steps 902 to 902, wherein:

[0124] Step 902: Obtain a target sampled voltage corresponding to the AC side voltage of the power conversion circuit.

[0125] Exemplarily, the real-time sampling voltage corresponding to the AC side voltage of the power conversion circuit is obtained through the first sampling circuit 110 connected to the first microcontroller 121 .

[0126] Step 904 : Mapping the target sampling voltage according to the first mapping relationship to obtain a target feedback voltage.

[0127] The first mapping relationship includes that the amplitude of the feedback voltage corresponding to the first sampling voltage is not greater than the amplitude of the feedback voltage corresponding to the second sampling voltage, and the amplitude of the first sampling voltage is greater than the amplitude of the second sampling voltage.

[0128] The target feedback voltage is used to determine a target driving voltage for turning on the switch tube based on the target feedback voltage. The amplitude of the target driving voltage is negatively correlated with the amplitude of the target feedback voltage, and the switching frequency of the switch tube varies with the amplitude of the AC side voltage.

[0129] In an exemplary embodiment, based on Figure 9 The embodiment shown in this embodiment relates to a process of mapping a target sampling voltage according to a first mapping relationship to obtain a target feedback voltage: processing the target sampling voltage according to the first mapping relationship to obtain a target feedback voltage amplitude; obtaining a first duty cycle voltage based on the target feedback voltage amplitude; and filtering the first duty cycle voltage to obtain a target feedback voltage.

[0130] In an exemplary embodiment, a method for controlling a switch tube driving voltage is provided; in this embodiment, the method is used to Figure 8 The second feedback circuit 310 is used as an example for explanation. It is understandable that the method provided in this embodiment can also be used in other circuits or computer devices that can calculate or obtain the switching frequency of the switch tube and are connected to the power circuit. Figure 10 , the method includes steps 1002 and 1004, wherein:

[0131] Step 1002: Obtain a target switching frequency of a switch in a power conversion circuit.

[0132] Exemplarily, the programmable logic device 311 performs calculations based on the AC side voltage to obtain a target switching frequency of the switch tube.

[0133] Step 1004: Process the target switching frequency according to a second mapping relationship to obtain a target feedback voltage, wherein the second mapping relationship includes that the amplitude of the feedback voltage corresponding to the first switching frequency is not less than the amplitude of the feedback voltage corresponding to the second switching frequency, and the first switching frequency is greater than the second switching frequency.

[0134] Among them, the target feedback voltage is used to determine the target driving voltage for driving the switching tube to turn on based on the target feedback voltage. The relationship between the amplitude of the target driving voltage and the amplitude of the target feedback voltage is negatively correlated, and the switching frequency of the switching tube changes with the amplitude of the AC side voltage of the power conversion circuit.

[0135] Optionally, the target switching frequency is processed by the programmable logic device 311 according to the second mapping relationship to obtain the target feedback voltage amplitude, and the second duty cycle voltage is obtained based on the target feedback voltage amplitude; the second duty cycle voltage is filtered by the third filtering circuit to obtain the target feedback voltage.

[0136] In an exemplary embodiment, a computer device is provided. The computer device may be the first microcontroller 121 in the power converter, or the programmable logic device 311 in the power converter, or the third microcontroller; its internal structure diagram may be as shown in FIG. Figure 11 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store data that needs to be stored and called when executing the pole welding control method. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, it implements at least part of the steps in a switch tube drive voltage control method.

[0137] Those skilled in the art will understand that Figure 8The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0138] In one embodiment, a computer device is further provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0139] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0140] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0141] In an exemplary embodiment, a power converter is provided. The power converter includes the switch tube drive voltage control circuit 100 and the power conversion circuit 200 provided in the above embodiment, wherein the switch tube drive voltage control circuit 100 is connected to the drive terminal of each switch tube in the power conversion circuit 200.

[0142] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic devices based on quantum computing, and the like.

[0143] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0144] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for controlling a switch tube driving voltage, characterized in that: The method comprises: Sampling the AC side voltage of the power conversion circuit to obtain a target sampling voltage; A target driving voltage is determined based on the target sampling voltage; wherein the target driving voltage is used to drive the conduction of the switching tube in the power conversion circuit, the switching frequency of the switching tube varies with the amplitude of the AC side voltage, and the target driving voltage is positively correlated with the target sampling voltage.

2. The method according to claim 1, characterized in that The determining of the target driving voltage according to the target sampling voltage includes: determining a target feedback voltage according to the target sampling voltage; determining a target power supply voltage according to the target feedback voltage; wherein the relationship between the amplitude of the target power supply voltage and the amplitude of the target feedback voltage is negatively correlated; The target driving voltage is determined according to the target power supply voltage.

3. The method according to claim 2, characterized in that The determining of the target feedback voltage according to the target sampling voltage includes: The target feedback voltage is obtained by processing the target sampling voltage according to a first mapping relationship; wherein the first mapping relationship includes that the amplitude of the feedback voltage corresponding to the first sampling voltage is not greater than the amplitude of the feedback voltage corresponding to the second sampling voltage, and the amplitude of the first sampling voltage is greater than the amplitude of the second sampling voltage.

4. The method according to claim 3, characterized in that The processing based on the target sampling voltage according to the first mapping relationship to obtain the target feedback voltage includes: Processing the target sampling voltage according to the first mapping relationship to obtain a first duty cycle voltage; The first duty cycle voltage is filtered to obtain the target feedback voltage.

5. The method according to claim 4, characterized in that The first mapping relationship includes a linear relationship between the amplitude of the feedback voltage and the amplitude of the sampling voltage.

6. The method according to claim 4, characterized in that The first mapping relationship includes a nonlinear relationship between the amplitude of the feedback voltage and the amplitude of the sampling voltage.

7. The method according to claim 2, characterized in that The determining of the target feedback voltage according to the target sampling voltage includes: Performing rectification and phase shifting processing on the target sampled voltage to obtain a rectified voltage; The rectified voltage is filtered and amplified to obtain the target feedback voltage.

8. A method for controlling a switch tube driving voltage, characterized in that: The method further comprises: Obtaining the target switching frequency of the switch tube in the power conversion circuit; Processing the target switching frequency according to a second mapping relationship to obtain a target feedback voltage; wherein the second mapping relationship includes that the amplitude of the feedback voltage corresponding to the first switching frequency is not less than the amplitude of the feedback voltage corresponding to the second switching frequency, and the first switching frequency is greater than the second switching frequency; A target driving voltage is determined according to the target feedback voltage; wherein the target driving voltage is used to drive the switching tube in the power conversion circuit to conduct.

9. A switch tube drive voltage control circuit, characterized in that: The switch tube driving voltage control circuit includes a first sampling circuit and a driving circuit, and the first sampling circuit and the driving circuit are directly or indirectly connected; The switch tube drive voltage control circuit is used to execute the switch tube drive voltage control method according to any one of claims 1 to 7.

10. A switch tube drive voltage control circuit, characterized in that: The switch tube driving voltage control circuit includes a second feedback circuit and a driving circuit, and the second feedback circuit is directly or indirectly connected to the driving circuit; The switch tube drive voltage control circuit is used to execute the switch tube drive voltage control method according to claim 8.

11. A power converter, characterized in that: The power converter comprises a switch tube drive voltage control circuit and a power conversion circuit according to any one of claims 9 to 10; The switch tube driving voltage control circuit is connected to the driving end of each switch tube in the power conversion circuit.

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