A transformer control method and device, electronic equipment and storage medium

Abstract

The application provides a converter control method and device, electronic equipment and storage medium, and relates to the technical field of vehicles.The converter control method provided by the application comprises the following steps: determining a load state according to an output current of a DCDC converter; when the load state is a first load state, controlling the DCDC converter to work in a fixed-frequency control mode; and when the load state is a second load state, controlling the DCDC converter to work in a variable-frequency control mode, wherein the variable-frequency control mode is a control mode realized by fixing the conduction time and adjusting the off time, and the load power corresponding to the first load state is greater than the load power corresponding to the second load state.The application can reduce the light-load part loss in a targeted manner, thereby improving the light-load conversion efficiency as a whole, and improving the overall energy consumption performance without increasing the hardware cost and volume.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to a converter control method, apparatus, electronic device, and storage medium. Background Technology

[0002] As a crucial component of new energy vehicles, the efficiency of the on-board power system directly impacts the overall energy utilization rate of the vehicle. Among these components, the on-board DC-DC converter is primarily used to convert the DC power from the high-voltage power battery into low-voltage DC power to supply power to the low-voltage battery and low-voltage electrical equipment. It is an indispensable key component in new energy vehicles.

[0003] Currently, automotive DC-DC converters typically need to operate within a wide input voltage range. However, during actual vehicle operation, DC-DC converters are often under medium to low load or even light load conditions, such as vehicle standby, low power consumption, or battery maintenance and charging. In these conditions, the output power is significantly lower than the rated power. To improve light load efficiency, the usual approach is to select higher-performance components, but this means increased costs. Alternatively, the switching frequency can be reduced to decrease the switching losses of switching transistors, transformers, inductors, etc. However, a lower switching frequency can cause transformer cores to saturate, requiring the selection of larger transformers, inductors, filter capacitors, and other components, resulting in larger product size and higher costs. Summary of the Invention

[0004] The problem addressed by this invention is how to improve the light-load electrical conversion efficiency of DC-DC converters at a low cost.

[0005] To address the above problems, the present invention provides a converter control method, apparatus, electronic device, and storage medium.

[0006] In a first aspect, the present invention provides a converter control method, comprising: Determine the load status based on the output current of the DC-DC converter; When the load state is the first load state, the DC-DC converter is controlled to operate in the fixed frequency control mode; When the load state is the second load state, the DC-DC converter is controlled to operate in the frequency conversion control mode. The frequency conversion control mode is a control mode that is implemented by fixing the on time and adjusting the off time. The load power corresponding to the first load state is greater than the load power corresponding to the second load state.

[0007] Optionally, determining the load state based on the output current of the DC-DC converter includes: The output current of the DC-DC converter is compared with a preset current threshold. Based on the comparison results, the load state is determined to be either the first load state or the second load state.

[0008] Optionally, determining the load state based on the output current of the DC-DC converter includes: The output power of the DC-DC converter is determined based on the output current of the DC-DC converter. The output power of the DC-DC converter is compared with a preset power threshold, and the load state is determined to be either the first load state or the second load state based on the comparison result.

[0009] Optionally, controlling the DC-DC converter to operate in a fixed-frequency control mode includes: The switching frequency of the primary-side switching transistor in the DC-DC converter is set to a preset fixed frequency. Adjust the duty cycle or phase shift angle of the primary-side switching transistor to regulate the output voltage and / or output current of the DC-DC converter.

[0010] Optionally, adjusting the duty cycle or phase shift angle of the primary-side switch includes: The output voltage and / or output current of the DC-DC converter are compared with reference values ​​to generate an error signal; The duty cycle or the phase shift angle is adjusted based on the error signal using a closed-loop control algorithm.

[0011] Optionally, controlling the DC-DC converter to operate in frequency conversion control mode includes: The on-time of the primary-side switch in the DC-DC converter is set to a fixed on-time. Adjusting the turn-off time of the primary-side switching transistor allows for regulation of the output voltage and / or output current of the DC-DC converter.

[0012] Optionally, controlling the DC-DC converter to operate in frequency conversion control mode further includes: The target value of the fixed on-time is determined based on the input voltage of the DC-DC converter. When the input voltage is within the same operating range, the fixed conduction time is kept constant at the target value.

[0013] In a second aspect, the present invention provides a converter control device, comprising: The first module is used to determine the load status based on the output current of the DC-DC converter. The second module is used to control the DC-DC converter to operate in a fixed-frequency control mode when the load state is the first load state. The third module is used to control the DC-DC converter to operate in frequency conversion control mode when the load state is the second load state. The frequency conversion control mode is a control mode that is achieved by fixing the on time and adjusting the off time. The load power corresponding to the first load state is greater than the load power corresponding to the second load state.

[0014] Thirdly, the present invention provides an electronic device, including a memory and a processor; The memory is used to store computer programs; The processor is configured to implement the converter control method as described in the first aspect when executing the computer program.

[0015] Fourthly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the converter control method as described in the first aspect.

[0016] The beneficial effects of the converter control method of the present invention are as follows: the load state is distinguished according to the output current, and a fixed frequency control mode and a variable frequency control mode are adopted under different load states, so that the DC-DC converter maintains stable regulation characteristics and dynamic response capability under medium and heavy loads, and reduces the switching frequency under light loads, thereby reducing the switching losses of the switching devices; since the switching losses account for a high proportion of the total losses under light load conditions, this solution can specifically reduce this part of the losses, thus improving the overall conversion efficiency under light loads and improving the overall energy consumption performance without increasing hardware costs and size. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating the converter control method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the process for determining the load state according to an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the specific process of determining the load state according to an embodiment of the present invention; Figure 4 This is a flowchart illustrating the fixed-frequency control mode according to an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the specific process of the fixed-frequency control mode in an embodiment of the present invention; Figure 6 This is a flowchart illustrating the frequency conversion control mode according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the voltage feedforward regulation process according to an embodiment of the present invention; Figure 8 This is a system architecture diagram of the converter control device according to an embodiment of the present invention; Figure 9This is a system architecture diagram of an electronic device according to an embodiment of the present invention; Figure 10 This is a typical circuit topology for existing DC-DC converters; Figure 11 Reload simulation waveforms for the existing solution; Figure 12 The waveform diagram for the existing solution under light load simulation; Figure 13 This is a schematic diagram of load state switching according to an embodiment of the present invention; Figure 14 This is a schematic diagram of the DC-DC circuit topology according to an embodiment of the present invention; Figure 15 The heavy-load simulation waveforms are from an embodiment of the present invention. Figure 1 ; Figure 16 Light load simulation waveforms in an embodiment of the present invention Figure 1 ; Figure 17 This is a schematic diagram of the heavy-load circuit control method according to an embodiment of the present invention; Figure 18 The heavy-load simulation waveforms are from an embodiment of the present invention. Figure 2 ; Figure 19 This is a schematic diagram of a light-load circuit control method according to an embodiment of the present invention; Figure 20 The light-load operating waveform of this invention embodiment Figure 2 ; Figure 21 This is a schematic diagram of a full-bridge current-doubling rectifier circuit according to an embodiment of the present invention; Figure 22 This is a schematic diagram of a non-isolated step-down circuit according to an embodiment of the present invention. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "one" and "more" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] The names of the messages or information exchanged between the multiple devices in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0023] Combination Figure 10 The diagram shows a typical circuit topology for a DC-DC converter. DC-DC converters typically employ a full-bridge topology, which is widely used due to its advantages such as circuit simplicity, low cost, high conversion efficiency under medium to high loads, and a wide input-output voltage ratio. However, due to the inherent characteristics of switching power supplies, the electrical conversion efficiency is usually low under light loads, and it typically decreases further with increasing switching frequency. Figure 11 The simulation waveform of the existing scheme under heavy load is shown (output power 3000W, switching frequency 70kHz, duty cycle 0.32, primary-side switch turn-on time 4.6us). Figure 12 The simulation waveform of the existing scheme under light load is shown (output power 100W, switching frequency 70kHz, duty cycle 0.135, primary-side switch turn-on time 1.9us).

[0024] To address the aforementioned issues, this invention proposes a novel control strategy without compromising product cost and size, thereby improving the light-load electrical conversion efficiency of DC-DC converters.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a converter control method, comprising: S100: Determine the load status based on the output current of the DC-DC converter.

[0026] Specifically, the current load state is identified based on the load condition on the output side of the DC-DC converter. For example, when the output current is greater than 5A, it is determined to be the first load state (heavy load state), and when the output current is less than 3A, it is determined to be the second load state (light load state).

[0027] S200: When the load state is the first load state, control the DC-DC converter to operate in the fixed frequency control mode.

[0028] Specifically, under the first load condition, the DC-DC converter operates in a fixed-frequency control mode, for example, at a fixed frequency of 70 kHz.

[0029] S300: When the load state is the second load state, control the DC-DC converter to work in the frequency conversion control mode. The frequency conversion control mode is a control mode that is achieved by fixing the on time and adjusting the off time. The load power corresponding to the first load state is greater than the load power corresponding to the second load state.

[0030] Specifically, under the second load condition, the DC-DC converter operates in frequency conversion control mode, with the turn-on time of the primary-side switch fixed. By adjusting the turn-off time of the primary switch, the output voltage and current can be adjusted, and the switching frequency can be reduced to the range of 10 to 20 kHz, thereby significantly reducing switching losses.

[0031] Among them, combined Figure 13 As shown, the first load state (heavy load state) and the second load state (light load state) can be switched between each other. For example, if the current state is the first load state (heavy load state), and the output power P0 < P min1 If the output power P0 > P, then switch to the second load state (light load state). Correspondingly, the current state is the second load state (light load state). min2 Then it switches to the first load state (overload state). Among them, for Figure 14 The DC-DC circuit topology shown is simulated. Figure 15 The simulation waveform of this scheme under heavy load is shown (output power 3000W, switching frequency 70kHz, duty cycle 0.32, primary-side switch turn-on time 4.6us, operating mode is the same as the existing fixed frequency duty cycle adjustment scheme). Figure 16 The simulation waveform of this scheme under light load is shown (output power 100W, switching frequency 10kHz, primary-side switch turn-on time 5us). Under light load, the operating mode is switched to the primary-side switch M1~M4 with fixed turn-on time. The output voltage and current are controlled by adjusting their turn-off time. Under the same light load mode, the control strategy of this scheme reduces the switching frequency from the original 70kHz to 10kHz. The switching frequency is greatly reduced, and the switching losses of the primary and secondary switches are greatly reduced, thereby improving the light load efficiency.

[0032] Among them, the magnetic flux density B of the DC-DC transformer max The calculation formula is as follows: B max =V in *T on / N*A e ; Among them, V in T represents the input voltage. on Indicates the on-time of the primary MOSFET, N represents the primary winding of the transformer, and A represents the on-time of the primary MOSFET. e This represents the cross-sectional area of ​​the transformer core. The transformer primary winding N has a core cross-sectional area A. e The value is fixed, and the conduction time T is controlled. on It can accurately control the magnetic induction intensity of the transformer core, effectively preventing the transformer from entering a saturation state and solving the problem that existing frequency reduction schemes easily lead to transformer saturation.

[0033] In this embodiment, the load state is distinguished according to the output current, and a fixed-frequency control mode and a variable-frequency control mode are adopted under different load states. This enables the DC-DC converter to maintain stable regulation characteristics and dynamic response capability under medium and heavy loads, and to reduce the switching frequency under light loads, thereby reducing the switching losses of the switching devices. Since the switching losses account for a relatively high proportion of the total losses under light load conditions, this solution can specifically reduce this part of the losses, thus improving the overall conversion efficiency under light loads and improving the overall energy consumption performance of the machine without increasing hardware costs and size.

[0034] Optionally, determining the load state based on the output current of the DC-DC converter includes: S110: Compare the output current of the DC-DC converter with a preset current threshold.

[0035] Specifically, in combination Figure 2 As shown, the output current is sampled by a Hall sensor or a sampling resistor. The sampled output current is compared with a preset current threshold. For example, the preset current threshold can be set to 10%–20% of the rated current, or dynamically set according to the system thermal design.

[0036] S120: Determine the load state as either the first load state or the second load state based on the comparison result.

[0037] Specifically, when the output current is higher than the first threshold, it is determined to be a first load state, and when the output current is lower than the second threshold, it is determined to be a second load state. This determination can be performed once per control cycle, for example, once every 100μs.

[0038] In this optional embodiment, the load state can be determined by comparing the output current with a preset current threshold. This method is simple to implement, has high real-time performance, can quickly identify light load conditions, and can promptly switch the control mode to a high-efficiency mode, thereby reducing ineffective switching losses and improving system operating efficiency and control reliability.

[0039] Optionally, determining the load state based on the output current of the DC-DC converter includes: S130: Determine the output power of the DC-DC converter based on the output current of the DC-DC converter.

[0040] Specifically, in combination Figure 3 As shown, in this embodiment, the load status can also be determined based on the output power. First, the output power of the DC-DC converter is determined based on the output current and output voltage of the DC-DC converter. The output voltage can be sampled by the analog-to-digital converter.

[0041] S140: Compare the output power of the DC-DC converter with a preset power threshold, and determine the load state as the first load state or the second load state based on the comparison result.

[0042] Specifically, the output power of the DC-DC converter is compared with a preset power threshold. For example, when the output power is less than 200W, it enters the second load state (light load state), and when the output power is greater than 300W, it enters the first load state (heavy load state).

[0043] In this optional embodiment, the output power is calculated by combining the output current and the output voltage, and the load status is determined based on the power, making the load identification more accurate. This is particularly suitable for application scenarios with a large range of output voltage variations, and can comprehensively reflect the actual load energy demand, thereby avoiding possible misjudgments that may occur when judging solely by the current. This makes the control mode switching more precise and facilitates entering the light-load high-efficiency control mode at a more appropriate time.

[0044] Optionally, controlling the DC-DC converter to operate in a fixed-frequency control mode includes: S210: Set the switching frequency of the primary-side switch in the DC-DC converter to a preset fixed frequency.

[0045] Specifically, in combination Figure 4 As shown, in fixed-frequency control mode, the controller is set to a fixed switching frequency, such as 70kHz.

[0046] S220: Adjust the duty cycle or phase shift angle of the primary-side switching transistor to regulate the output voltage and / or output current of the DC-DC converter.

[0047] Specifically, output regulation is achieved by adjusting the duty cycle or phase shift angle of the primary-side switching transistor. For example, in a phase-shifted full-bridge, the transmission power is controlled by changing the phase shift angle between the bridge arms. Figure 17 This illustrates the heavy-load circuit control method of this scheme. Figure 18 The simulation waveform under heavy load for this scheme is shown.

[0048] The duty cycle D is calculated using the following formula: ; Among them, V O Indicates the output voltage, V IN Indicates the input voltage, V RDSON V represents the equivalent value of the on-state voltage drop of the secondary-side rectifier device. RDSON2 This represents the equivalent value of the on-state voltage drop of the primary-side switch, and n represents the transformer turns ratio.

[0049] In this optional embodiment, a fixed switching frequency is maintained in the fixed frequency control mode, and the output is adjusted by adjusting the duty cycle or phase shift angle. This helps to maintain stable control loop characteristics and predictable electromagnetic characteristics. The switching loss ratio is relatively low under medium and heavy loads, thus balancing efficiency and dynamic response performance.

[0050] Optionally, adjusting the duty cycle or phase shift angle of the primary-side switch includes: S221: Compare the output voltage and / or output current of the DC-DC converter with a reference value to generate an error signal.

[0051] Specifically, in combination Figure 5 As shown, the output voltage is first compared with the reference voltage, and the current command is output through the PI regulator. Then, the actual current is compared with the current command to determine the error signal.

[0052] S222: Adjust the duty cycle or the phase shift angle according to the error signal using a closed-loop control algorithm.

[0053] Specifically, the error signal is adjusted by PI to obtain the duty cycle or phase shift angle. The closed-loop adjustment adopts a dual closed-loop structure, with the outer loop being the voltage loop and the inner loop being the current loop. The PI parameters can be adjusted according to the system bandwidth requirements, for example, the voltage loop bandwidth is 1kHz and the current loop bandwidth is 5kHz.

[0054] In this optional embodiment, the duty cycle or phase shift angle is automatically adjusted according to the error signal through a closed-loop control algorithm, so that the output voltage and current are stabilized within the target range, improving the steady-state accuracy and anti-disturbance capability of the system. It can quickly correct the output when the input voltage fluctuates or the load changes suddenly, thereby ensuring that the DC-DC converter has good dynamic performance and power supply stability under medium and heavy load conditions.

[0055] Optionally, controlling the DC-DC converter to operate in frequency conversion control mode includes: S310: Set the on-time of the primary-side switch in the DC-DC converter to a fixed on-time.

[0056] Specifically, in combination Figure 6 As shown, in the frequency conversion control mode, a fixed on-time control is adopted, for example, the fixed on-time is set to 5μs.

[0057] S320: Adjust the turn-off time of the primary-side switch to regulate the output voltage and / or output current of the DC-DC converter.

[0058] Specifically, by adjusting the turn-off time of the primary-side switch, for example, by extending the turn-off time when the load decreases and shortening the turn-off time when the load increases, the switching frequency changes automatically and can be reduced to 10kHz under light load. The switching frequency is greatly reduced, and the switching losses of the primary and secondary-side switches are greatly reduced, thereby improving the efficiency under light load. Figure 19 This illustrates the light-load circuit control method of this scheme. Figure 20 The waveforms under light load are shown in this diagram; furthermore, the light load control strategy of this solution is also applicable to... Figure 21 The full-bridge current doubler rectifier circuit shown, and Figure 22 The non-isolated buck circuit shown.

[0059] In this optional embodiment, the control method of fixing the on time and adjusting the off time is adopted in the frequency conversion control mode, so that the on time is no longer used as an adjustment variable. Thus, the switching frequency can be reduced by extending the off time while ensuring that the single energy transfer is controllable. After the switching frequency is reduced, the switching losses of the primary and secondary switching tubes are significantly reduced, and the efficiency can be significantly improved, especially under light load.

[0060] Optionally, controlling the DC-DC converter to operate in frequency conversion control mode further includes: S330: Determine the target value of the fixed on-time based on the input voltage of the DC-DC converter.

[0061] Specifically, in combination Figure 7 As shown, to avoid transformer saturation, this embodiment introduces input voltage feedforward regulation. When the input voltage changes, the target value of the fixed conduction time is recalculated.

[0062] S340: When the input voltage is within the same operating range, the fixed conduction time is kept constant at the target value.

[0063] Specifically, within the same input voltage range (such as ±20V fluctuation), keeping the fixed on-time at the target value can maintain the fixed on-time control characteristics, prevent core saturation, and thus improve system reliability.

[0064] In this optional embodiment, a target value for the fixed on-time is determined based on the input voltage, so that the on-time matches the change in input voltage. This controls the magnetic flux density of the transformer to not exceed the design upper limit, avoids the magnetic core from entering a saturated state, and keeps the on-time constant within the same input voltage operating range. This maintains the stability of the fixed on-time control while also taking into account the constraint on magnetic flux, achieving a balance between efficiency improvement and reliability assurance. This overcomes the problem of magnetic saturation that is easily caused by traditional simple frequency reduction schemes.

[0065] like Figure 8 As shown, an embodiment of the present invention provides a converter control device 800, comprising: The first module 810 is used to determine the load status based on the output current of the DC-DC converter. The second module 820 is used to control the DC-DC converter to operate in a fixed-frequency control mode when the load state is the first load state. The third module 830 is used to control the DC-DC converter to operate in frequency conversion control mode when the load state is the second load state. The frequency conversion control mode is a control mode that is achieved by fixing the on time and adjusting the off time. The load power corresponding to the first load state is greater than the load power corresponding to the second load state.

[0066] like Figure 9 As shown, an electronic device 900 provided in this embodiment of the invention includes a memory 920 and a processor 910; the memory 920 is used to store a computer program; the processor 910 is used to implement the converter control method as described above when the computer program is executed.

[0067] Alternatively, an electronic device 900 includes a memory 920 and a processor 910 coupled to the memory 920; the memory 920 is configured to store a computer program; and the processor 910 is configured to perform the following operations when the computer program is executed: Determine the load status based on the output current of the DC-DC converter; When the load state is the first load state, the DC-DC converter is controlled to operate in the fixed frequency control mode; When the load state is the second load state, the DC-DC converter is controlled to operate in the frequency conversion control mode. The frequency conversion control mode is a control mode that is implemented by fixing the on time and adjusting the off time. The load power corresponding to the first load state is greater than the load power corresponding to the second load state.

[0068] This invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the converter control method described above.

[0069] Alternatively, a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the following operations: Determine the load status based on the output current of the DC-DC converter; When the load state is the first load state, the DC-DC converter is controlled to operate in the fixed frequency control mode; When the load state is the second load state, the DC-DC converter is controlled to operate in the frequency conversion control mode. The frequency conversion control mode is a control mode that is implemented by fixing the on time and adjusting the off time. The load power corresponding to the first load state is greater than the load power corresponding to the second load state.

[0070] The present invention will now be described an electronic device 900 that can serve as a server or client of the present invention, which is an example of a hardware device that can be applied to various aspects of the present invention. Electronic device 900 is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic device 900 can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0071] Electronic device 900 includes a computing unit that can perform various appropriate actions and processes based on a computer program stored in read-only memory (ROM) or a computer program loaded from a storage unit into random access memory (RAM). The RAM may also store various programs and data required for device operation. The computing unit, ROM, and RAM are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus.

[0072] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc. In this application, 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 the embodiments of the present invention according to actual needs. Furthermore, 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. The integrated units can be implemented in hardware or as software functional units.

[0073] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A converter control method, characterized in that, include: Determine the load status based on the output current of the DC-DC converter; When the load state is the first load state, the DC-DC converter is controlled to operate in the fixed frequency control mode; When the load state is the second load state, the DC-DC converter is controlled to operate in the frequency conversion control mode. The frequency conversion control mode is a control mode that is implemented by fixing the on time and adjusting the off time. The load power corresponding to the first load state is greater than the load power corresponding to the second load state.

2. The converter control method according to claim 1, characterized in that, Determining the load status based on the output current of the DC-DC converter includes: The output current of the DC-DC converter is compared with a preset current threshold. Based on the comparison results, the load state is determined to be either the first load state or the second load state.

3. The converter control method according to claim 1, characterized in that, Determining the load status based on the output current of the DC-DC converter includes: The output power of the DC-DC converter is determined based on the output current of the DC-DC converter. The output power of the DC-DC converter is compared with a preset power threshold, and the load state is determined to be either the first load state or the second load state based on the comparison result.

4. The converter control method according to claim 1, characterized in that, The control of the DC-DC converter to operate in fixed-frequency control mode includes: The switching frequency of the primary-side switching transistor in the DC-DC converter is set to a preset fixed frequency. Adjust the duty cycle or phase shift angle of the primary-side switching transistor to regulate the output voltage and / or output current of the DC-DC converter.

5. The converter control method according to claim 4, characterized in that, The adjustment of the duty cycle or phase shift angle of the primary-side switch includes: The output voltage and / or output current of the DC-DC converter are compared with reference values ​​to generate an error signal; The duty cycle or the phase shift angle is adjusted based on the error signal using a closed-loop control algorithm.

6. The converter control method according to claim 1, characterized in that, The control of the DC-DC converter to operate in frequency conversion control mode includes: The on-time of the primary-side switch in the DC-DC converter is set to a fixed on-time. Adjusting the turn-off time of the primary-side switching transistor allows for regulation of the output voltage and / or output current of the DC-DC converter.

7. The converter control method according to claim 6, characterized in that, The method of controlling the DC-DC converter to operate in frequency conversion control mode also includes: The target value of the fixed on-time is determined based on the input voltage of the DC-DC converter. When the input voltage is within the same operating range, the fixed conduction time is kept constant at the target value.

8. A converter control device, characterized in that, include: The first module is used to determine the load status based on the output current of the DC-DC converter. The second module is used to control the DC-DC converter to operate in a fixed-frequency control mode when the load state is the first load state. The third module is used to control the DC-DC converter to operate in frequency conversion control mode when the load state is the second load state. The frequency conversion control mode is a control mode that is achieved by fixing the on time and adjusting the off time. The load power corresponding to the first load state is greater than the load power corresponding to the second load state.

9. An electronic device, characterized in that, Including memory and processor; The memory is used to store computer programs; The processor is configured to implement the converter control method as described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the converter control method as described in any one of claims 1 to 7.

Images