Dc-dc converter, voltage conversion method, drive controller, and power supply device

Abstract

The application provides a direct current converter, a voltage conversion control method, a drive controller and a power supply device. The circuit structure of the direct current converter comprises one power switch tube, four power inductors, five capacitors, one power switch tube and nine diodes. Through circuit design, the internal characteristics of the switch inductor network are utilized, and one power switch tube is used, so that high voltage gain is realized and control difficulty is reduced.

Description

Technical Field

[0001] This application relates to the field of power electronics, and more particularly to a DC converter, a transformer control method, a drive controller, and a power supply device. Background Technology

[0002] In new energy power generation systems (such as photovoltaics and fuel cells), it is usually necessary to boost the lower input DC voltage to a higher DC bus voltage.

[0003] Traditional Boost converters, when the duty cycle varies from 0 to 0.8, can only have a gain ranging from 0 to 4, meaning the output voltage can only be 0 to 4 times the input voltage, significantly limiting their applicable voltage range. Furthermore, existing quadratic high-gain converters are typically complex in structure, using multiple power switches, which increases control complexity and cost.

[0004] Therefore, how to design a DC-DC converter to achieve high voltage gain with low control difficulty is an urgent problem to be solved. Summary of the Invention

[0005] This application provides a DC-DC converter, a transformer control method, a drive controller, and a power supply device for achieving high voltage gain in a circuit structure using a single power switch.

[0006] In a first aspect, this application provides a DC-DC converter, comprising: the positive terminal of an input power supply is connected to one end of a first inductor L1 and the anode of a first diode D1; the negative terminal of the input power supply is grounded and connected to one end of a second capacitor C2, one end of a third capacitor C3, one end of a fourth capacitor C4, one end of a load, and the drain of a power switch S1.

[0007] The cathode of the first diode D1 is connected to the cathode of the second diode D2 and one end of the second inductor L2, respectively;

[0008] The other end of the first inductor L1 is connected to the anode of the second diode D2 and the anode of the third diode D3, respectively;

[0009] The cathode of the third diode D3 is connected to the other end of the second inductor L2, the anode of the fourth diode D4, and the cathode of the sixth diode D6, respectively.

[0010] The source of the power switch S1 is connected to the cathode of the fourth diode D4, the cathode of the fifth diode D5, one end of the fourth inductor L4, and the anode of the ninth diode D9, respectively.

[0011] The anode of the sixth diode D6 is connected to one end of the third inductor L3 and the other end of the second capacitor C2, respectively.

[0012] The anode of the fifth diode D5 is connected to the other end of the third inductor L3, the cathode of the seventh diode D7, and one end of the fifth capacitor C5, respectively.

[0013] The other end of the fifth capacitor C5 is connected to the anode of the seventh diode D7, the cathode of the eighth diode D8, and the other end of the fourth inductor L4, respectively.

[0014] The anode of the eighth diode D8 is connected to the other end of the third capacitor C3;

[0015] The cathode of the ninth diode D9 is connected to the other end of the fourth capacitor C4 and the other end of the load, respectively.

[0016] Furthermore, the DC-DC converter has a first operating mode and a second operating mode;

[0017] In the first operating mode, the power switch S1 is turned on, and the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, and the eighth diode D8 are turned on; the sixth diode D6, the seventh diode D7, and the ninth diode D9 are turned off.

[0018] Furthermore, in the second operating mode, the power switch S1 is turned off, and the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, and the eighth diode D8 are turned off; while the sixth diode D6, the seventh diode D7, and the ninth diode D9 are turned on.

[0019] Furthermore, the voltage gain M of the DC-DC converter is:

[0020]

[0021] Wherein, D is the duty cycle of the power switch S1.

[0022] Furthermore, in the first operating mode, the voltage relationship is as follows:

[0023]

[0024]

[0025]

[0026] Among them, V in V is the input power supply voltage. L1 V is the voltage across the first inductor. L3 V is the voltage across the second inductor.L2 V is the voltage across the third inductor. L4 V is the voltage across the fourth inductor. C2 V is the voltage across the second capacitor. C3 This is the voltage across the third capacitor.

[0027] Furthermore, in the second operating mode, the voltage relationship is as follows:

[0028]

[0029]

[0030]

[0031] Among them, V in The input power supply voltage. The voltage across the first inductor is The voltage across the second inductor is The voltage across the third inductor is V is the voltage across the fourth inductor. C2 V is the voltage across the second capacitor. C3 The voltage across the third capacitor is... This is the output voltage at the load.

[0032] Secondly, this application provides a transformer control method applied to the DC transformer described in any one of the first aspects, the method comprising:

[0033] Obtain the input voltage and desired output voltage of the DC transformer;

[0034] Determine the target voltage gain based on the input voltage and the desired output voltage;

[0035] Based on the target voltage gain, determine the target duty cycle of the power switch S1;

[0036] The duty cycle of the power switch S1 is adjusted based on the target duty cycle.

[0037] Thirdly, this application provides a transformer control device, comprising:

[0038] The acquisition module is used to acquire the input voltage and the desired output voltage of the DC transformer;

[0039] A gain determination module is used to determine the target voltage gain based on the input voltage and the desired output voltage;

[0040] The duty cycle determination module is used to determine the target duty cycle of the power switch S1 based on the target voltage gain.

[0041] The duty cycle control module is used to control the duty cycle of the power switch S1 based on the target duty cycle.

[0042] Fourthly, this application provides a drive controller, including: a memory and a processor;

[0043] The memory stores computer-executed instructions;

[0044] The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in the second aspect.

[0045] Fourthly, this application provides a power supply device, the power supply device including the DC-DC converter described in any of the first aspects.

[0046] This application provides a DC-DC converter, a transformer control method, a drive controller, and a power supply device. The DC-DC converter includes a power switch, four power inductors, five capacitors, a switching inductor unit, and nine diodes. This invention utilizes the inherent characteristics of the switching inductor network, combined with the original characteristics of traditional DC-DC converters, to expand the output voltage gain of traditional DC-DC converters. Attached Figure Description

[0047] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0048] Figure 1 The circuit diagram of the DC-DC converter provided in this application;

[0049] Figure 2 A circuit diagram of the power switch transistor in the DC-DC converter provided in this application when it is turned on;

[0050] Figure 3 A circuit diagram of the DC-DC converter provided in this application when the power switch is off;

[0051] Figure 4 This is a flowchart illustrating a transformer control method provided in this application.

[0052] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0053] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application.

[0054] In new energy power generation systems (such as photovoltaic power generation and fuel cell systems), DC-DC converters are the core components for achieving efficient energy conversion. These systems typically require boosting low-voltage inputs (such as 20-40V for photovoltaic cells or 100-200V for fuel cells) to a DC bus voltage of hundreds or even thousands of volts to meet the voltage requirements of inverters, energy storage systems, or grid connection.

[0055] In existing technologies, traditional Boost converters employ a single-switch structure, with its core hardware consisting of an input inductor, a switching transistor, a diode, and an output capacitor. Software control adjusts the switching transistor's duty cycle via a PWM algorithm to regulate voltage. However, the voltage gain M of this structure is only linearly related to the duty cycle D, M = 1 / (1-D). When the duty cycle is close to 1, taking D = 0.8 as an example, the gain is only 4 times, and the switching transistor must withstand stress close to the output voltage, leading to a decrease in efficiency.

[0056] A quadratic Boost converter achieves quadratic gain, such as M = 1 / (1-D)^2, by cascading two Boost cells or introducing coupled inductors, utilizing the nonlinear characteristics of the hardware structure. At D = 0.8, the voltage gain can reach 16 times. Its hardware structure includes two switching transistors, multiple inductors, and diodes. Software control requires coordinating the timing of the two switching transistors, increasing the complexity of the control algorithm. For example, during the alternating conduction of switches S1 and S2, precise management of the dead time is necessary to avoid shoot-through short circuits, which increases switching losses.

[0057] The above solutions are all limited by the complexity of hardware topology and the coupling of software control, making it difficult to achieve a comprehensive performance that balances high gain, low stress, and low cost.

[0058] In view of this, this application provides a DC-DC converter that achieves high-gain voltage conversion through single-switch control combined with the synergistic effect of a multi-stage inductor-capacitor-diode network. At D=0.8, the voltage gain can reach 162 times.

[0059] Figure 1 The circuit diagram of the DC-DC converter provided in this application is as follows: Figure 1As shown, the system includes an input power supply, a power switch S1, a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a load.

[0060] The cathode of the first diode D1 is connected to the cathode of the second diode D2 and one end of the second inductor L2, respectively.

[0061] The other end of the first inductor L1 is connected to the anode of the second diode D2 and the anode of the third diode D3, respectively;

[0062] The cathode of the third diode D3 is connected to the other end of the second inductor L2, the anode of the fourth diode D4, and the cathode of the sixth diode D6, respectively.

[0063] The source of the power switch S1 is connected to the cathode of the fourth diode D4, the cathode of the fifth diode D5, one end of the fourth inductor L4, and the anode of the ninth diode D9, respectively.

[0064] The anode of the sixth diode D6 is connected to one end of the third inductor L3 and the other end of the second capacitor C2, respectively.

[0065] The anode of the fifth diode D5 is connected to the other end of the third inductor L3, the cathode of the seventh diode D7, and one end of the fifth capacitor C5, respectively.

[0066] The other end of the fifth capacitor C5 is connected to the anode of the seventh diode D7, the cathode of the eighth diode D8, and the other end of the fourth inductor L4, respectively.

[0067] The anode of the eighth diode D8 is connected to the other end of the third capacitor C3;

[0068] The cathode of the ninth diode D9 is connected to the other end of the fourth capacitor C4 and the other end of the load, respectively.

[0069] The DC-DC converter described above has two main operating modes within one switching cycle, which are described as follows:

[0070] Working Mode 1:

[0071] Figure 2 The circuit diagram of the power switch transistor in the DC-DC converter provided in this application when it is turned on is as follows: Figure 2As shown, power switch S1 is turned on, and diodes D1, D2, D3, D4, D5, and D8 are also turned on; diodes D6, D7, and D9 are turned off. Figure 2 In the middle, light gray indicates the end.

[0072] It should be noted that the conduction and cutoff of each diode in this application are determined by the voltage across the diode in the circuit, and do not require separate control.

[0073] After the switching transistor S1 is turned on, the input power supply directly charges the first inductor L1, and at the same time charges the second inductor L2 through the conducting diode D1. The first inductor L1 and the second inductor L2 are in an energy storage state.

[0074] Simultaneously, intermediate capacitors C2 and C3 release energy. Current flows through the conducting diode D8 to the fourth inductor L4, and simultaneously through the conducting diode D5 to the third inductor L3 (refer to the arrow direction in the diagram). The third inductor L3 and the fourth inductor L4 are in an energy storage state. The intermediate DC blocking capacitor C5 also participates in the energy transfer process.

[0075] Because diode D9 is cut off, energy from the input side cannot be directly transferred to the output side. Output capacitor C4 alone releases energy to the load R to maintain the output voltage V. o Stablize.

[0076] Under this operating mode, the relevant electrical parameters are related as follows:

[0077] (1)

[0078] (2)

[0079] (3)

[0080] Among them, V in V is the input power supply voltage. L1 V is the voltage across the first inductor. L3 V is the voltage across the second inductor. L2 V is the voltage across the third inductor. L4 V is the voltage across the fourth inductor. C2 V is the voltage across the second capacitor. C3 This is the voltage across the third capacitor.

[0081] Working Mode 2:

[0082] Figure 3 The circuit diagram provided in this application shows the power switch transistor being turned off in the DC-DC converter. Figure 3As shown, power switch S1 is off, and diodes D1, D2, D3, D4, D5, and D8 are cut off; diodes D6, D7, and D9 are on. Figure 3 In the middle, gray indicates the end.

[0083] The input power supply is connected in series with the first inductor L1 and the second inductor L2 (through the conducting diode D2). The first inductor L1 and the second inductor L2 release energy. The current flows through the conducting sixth diode D6 to the intermediate capacitor C2, charging the capacitor C2.

[0084] At the same time, the third inductor L3 releases energy, and the current flows through the intermediate DC-blocking capacitor C5 and the conducting seventh diode D7 to charge capacitor C3.

[0085] The fourth inductor L4 is also in the energy release state. Its current flows to the output side through the conducting ninth diode D9, charging the output capacitor C4 and simultaneously supplying energy to the load R.

[0086] Under this operating mode, the relevant electrical parameters are related as follows:

[0087] (4)

[0088] (5)

[0089] (6)

[0090] Among them, V in The input power supply voltage. The voltage across the first inductor is The voltage across the second inductor is The voltage across the third inductor is V is the voltage across the fourth inductor. C2 V is the voltage across the second capacitor. C3 The voltage across the third capacitor is... This is the output voltage at the load.

[0091] Voltage gain analysis when the converter is operating stably:

[0092] Let the switching period of the switching transistor be T. s The duty cycle is D, meaning the duration of working mode 1 is DT. s The duration of working mode 2 is (1-D)T s Based on the volt-second balance characteristic of inductors, we can obtain:

[0093] (7)

[0094] (8)

[0095] (9)

[0096] By combining equations (1) to (9), we can obtain:

[0097] (10)

[0098] (11)

[0099] (12)

[0100] Therefore, the voltage gain M of the DC-DC converter can be derived as:

[0101]

[0102] Taking D=0.8 as an example, the voltage gain M equals 162. It can be seen that the DC-DC converter of this application can have a high voltage gain under the control of a single power switch, without the need for an additional power switch. It has a simple structure, is easy to control, and realizes the expansion of the output voltage gain of traditional DC-DC converters.

[0103] This application features a wide voltage gain range. In practical applications, the duty cycle of the power switch can be adjusted according to actual needs to achieve voltage gain range regulation. The duty cycle of the power switch can be adjusted via pulse width modulation (PWM), which will not be discussed in detail here.

[0104] Based on the above embodiments, when the DC-DC converter has a transformation requirement in actual use, it can be used in the following ways.

[0105] Figure 4 A flowchart illustrating a transformer control method provided in this application is shown below. Figure 4 As shown, it includes the following steps:

[0106] S101. Obtain the input voltage and desired output voltage of the DC transformer.

[0107] The input voltage, i.e., the input power supply voltage, can be obtained in real time through a voltage sensor. The desired output voltage is a stable output voltage value set by the user or required by the system, which may come from a host computer command, a fixed set value, or be given based on dynamic operating conditions.

[0108] S102. Determine the target voltage gain based on the input voltage and the desired output voltage.

[0109] S103. Determine the target duty cycle of power switch S1 based on the target voltage gain.

[0110] Based on the known target voltage gain M, the target duty cycle D can be calculated using the following formula:

[0111]

[0112] S104. Adjust the duty cycle of power switch S1 based on the target duty cycle.

[0113] The calculated target duty cycle is applied to the switching transistor S1 through the actual control actuator (PWM generator) to achieve voltage regulation.

[0114] The transformer control method provided in this application can change the voltage gain over a wide range by adjusting the duty cycle of the switching transistor, based on the aforementioned DC-DC converter.

[0115] This application also provides a transformer control device, comprising:

[0116] The acquisition module is used to acquire the input voltage and the desired output voltage of the DC transformer;

[0117] The gain determination module is used to determine the target voltage gain based on the input voltage and the desired output voltage.

[0118] The duty cycle determination module is used to determine the target duty cycle of the power switch S1 based on the target voltage gain.

[0119] The duty cycle control module is used to control the duty cycle of the power switch S1 based on the target duty cycle.

[0120] The device provided in this embodiment can perform a transformer control method, and its implementation principle and technical effect are similar, so it will not be described in detail here.

[0121] This application also provides a drive controller, including at least one processor and a memory. Optionally, the drive controller further includes a communication component. The processor, memory, and communication component are connected via a bus.

[0122] In the specific implementation process, at least one processor executes computer execution instructions stored in memory, causing at least one processor to execute the above-described transformer control method.

[0123] The specific implementation process of the processor can be found in the above method embodiments, and its implementation principle and technical effect are similar, so it will not be repeated here.

[0124] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0125] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0126] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0127] This application also provides a power supply device, which includes the DC-DC converter described above.

[0128] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described transformer control method.

[0129] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the aforementioned transformer control method.

[0130] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0131] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0132] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0133] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0134] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0135] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0136] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0137] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A DC-DC converter, characterized in that, include: The positive terminal of the input power supply is connected to one end of the first inductor L1 and the anode of the first diode D1, respectively; the negative terminal of the input power supply is grounded and connected to one end of the second capacitor C2, one end of the third capacitor C3, one end of the fourth capacitor C4, one end of the load, and the drain of the power switch S1, respectively. The cathode of the first diode D1 is connected to the cathode of the second diode D2 and one end of the second inductor L2, respectively; The other end of the first inductor L1 is connected to the anode of the second diode D2 and the anode of the third diode D3, respectively; The cathode of the third diode D3 is connected to the other end of the second inductor L2, the anode of the fourth diode D4, and the cathode of the sixth diode D6, respectively. The source of the power switch S1 is connected to the cathode of the fourth diode D4, the cathode of the fifth diode D5, one end of the fourth inductor L4, and the anode of the ninth diode D9, respectively. The anode of the sixth diode D6 is connected to one end of the third inductor L3 and the other end of the second capacitor C2, respectively. The anode of the fifth diode D5 is connected to the other end of the third inductor L3, the cathode of the seventh diode D7, and one end of the fifth capacitor C5, respectively. The other end of the fifth capacitor C5 is connected to the anode of the seventh diode D7, the cathode of the eighth diode D8, and the other end of the fourth inductor L4, respectively. The anode of the eighth diode D8 is connected to the other end of the third capacitor C3; The cathode of the ninth diode D9 is connected to the other end of the fourth capacitor C4 and the other end of the load, respectively.

2. The DC-DC converter according to claim 1, characterized in that, The DC-DC converter has a first operating mode and a second operating mode; In the first operating mode, the power switch S1 is turned on, and the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, and the eighth diode D8 are turned on; the sixth diode D6, the seventh diode D7, and the ninth diode D9 are turned off.

3. The DC-DC converter according to claim 2, characterized in that, In the second operating mode, the power switch S1 is off, and the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, and the eighth diode D8 are off; the sixth diode D6, the seventh diode D7, and the ninth diode D9 are on.

4. The DC-DC converter according to any one of claims 1-3, characterized in that, The voltage gain M of the DC-DC converter is: Wherein, D is the duty cycle of the power switch S1.

5. The DC-DC converter according to claim 2, characterized in that, In the first operating mode, the voltage relationship is as follows: Among them, V in V is the input power supply voltage. L1 V is the voltage across the first inductor. L3 V is the voltage across the second inductor. L2 V is the voltage across the third inductor. L4 V is the voltage across the fourth inductor. C2 V is the voltage across the second capacitor. C3 This is the voltage across the third capacitor.

6. The DC-DC converter according to claim 3, characterized in that, In the second operating mode, the voltage relationship is as follows: Among them, V in The input power supply voltage. The voltage across the first inductor is The voltage across the second inductor is The voltage across the third inductor is V is the voltage across the fourth inductor. C2 V is the voltage across the second capacitor. C3 The voltage across the third capacitor is... This is the output voltage at the load.

7. A transformer control method, characterized in that, Applied to any one of the DC transformers of claims 1-6, characterized in that the method comprises: Obtain the input voltage and desired output voltage of the DC transformer; Determine the target voltage gain based on the input voltage and the desired output voltage; Based on the target voltage gain, determine the target duty cycle of the power switch S1; The duty cycle of the power switch S1 is adjusted based on the target duty cycle.

8. A transformer control device, characterized in that, include: The acquisition module is used to acquire the input voltage and the desired output voltage of the DC transformer. A gain determination module is used to determine the target voltage gain based on the input voltage and the desired output voltage; The duty cycle determination module is used to determine the target duty cycle of the power switch S1 based on the target voltage gain. The duty cycle control module is used to control the duty cycle of the power switch S1 based on the target duty cycle.

9. A drive controller, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in claim 6 or 7.

10. A power supply device, characterized in that, The power supply device includes the DC converter according to any one of claims 1-5.

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