Switching power supply, control method thereof, controller and readable storage medium

Abstract

The invention provides a switching power supply, a control method thereof, a controller and a readable storage medium. The switching power supply comprises a resonance network; the resonance network comprises a transformer; the transformer comprises a secondary coil and a primary coil module, and the primary coil module comprises a first primary coil and at least one coil unit; each coil unit comprises a second primary coil, a first switch and a second switch. According to the structure, the plurality of primary coils are configured on the primary side of the transformer, so that the excitation inductance and leakage inductance of the resonant network can be accurately regulated and controlled by adjusting the number of the primary coils connected in series. Through the mode, the resonant frequency of the switching power supply is effectively changed, the problem that the efficiency of the switching power supply is reduced due to the fact that the switching frequency is higher than the resonant frequency is avoided, the energy loss of the switching power supply in the operation process is remarkably reduced, and the overall operation efficiency and stability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of switching power supplies, and in particular to a switching power supply and a control method thereof, a controller and a readable storage medium. Background Art

[0002] With the advancement of the times, high-frequency switching power supplies are gradually developing towards intelligentization, high power density, and higher efficiency. The components of switching power supplies are constantly improving, especially power semiconductors, which are developing rapidly. Besides power semiconductors, magnetic components are also a key component of high-frequency switching power supplies. Magnetic components primarily include inductors and transformers. High-power power supply products are subject to significant temperature rise pressure, especially for magnetic components. Generally speaking, higher magnetic component temperatures mean greater losses, and greater losses mean lower efficiency.

[0003] The LLC resonant converter circuit, as a classic switching power supply topology, has been widely used. This topology has high conversion efficiency, low cost, and excellent cost-effectiveness. However, its biggest disadvantage is its insufficient output range. When the LLC has a low-voltage output requirement, the switching frequency will be higher than the resonant frequency, causing the basic operating mode of the LLC resonant circuit topology to change, and the operating efficiency and reliability will be greatly reduced. Summary of the Invention

[0004] The embodiments of the present invention provide a switching power supply and a control method thereof, a controller and a readable storage medium to solve the problem of a narrow output voltage range of an LLC resonant conversion circuit in the prior art.

[0005] In a first aspect, an embodiment of the present invention provides a switching power supply, comprising: a resonant network; the resonant network includes a transformer; the transformer includes a secondary coil and a primary coil module, the primary coil module includes a first primary coil and at least one coil unit; wherein each coil unit includes a second primary coil, a first switch, and a second switch;

[0006] The first end of the first primary coil is the first end of the primary coil module, the coil units are connected in series, and the first end of the series connection is connected to the second end of the first primary coil, and the second end of the series connection is the second end of the primary coil module;

[0007] For any coil unit, the coil unit includes a first end and a second end, and the first end of the first switch and the first end of the second switch of the coil unit are both connected to the first end of the coil unit, the second end of the first switch of the coil unit is connected to the first end of the corresponding second primary coil, and the second end of the second switch of the coil unit and the second end of the second primary coil of the coil unit are both connected to the second end of the coil unit.

[0008] In a possible implementation, the resonant network further includes a first capacitor; the first capacitor and the primary coil module are connected in series.

[0009] In a possible implementation, the resonant network further includes a first capacitor;

[0010] The first capacitor and the primary coil module are connected in parallel.

[0011] In a possible implementation, the switching power supply further includes a primary switch module; the primary switch module includes a first switch bridge arm and a second switch bridge arm;

[0012] The first end of the first switch bridge arm and the first end of the second switch bridge arm are both connected to the first input end of the primary switch module, and the second end of the first switch bridge arm and the second end of the second switch bridge arm are both connected to the second input end of the primary switch module;

[0013] The midpoint of the first switch bridge arm is connected to the first end of the primary coil module;

[0014] A midpoint of the second switch bridge arm is connected to the second end of the primary coil module.

[0015] In a possible implementation, the switching power supply further includes a secondary side rectifier module;

[0016] The secondary side rectifier module includes a first diode, a second diode, a third diode and a fourth diode;

[0017] The cathode of the first diode and the cathode of the second diode are both connected to the first output terminal of the switching power supply;

[0018] The anode of the first diode is connected to the cathode of the third diode, and the anode of the second diode is connected to the cathode of the fourth diode;

[0019] The first end of the secondary coil is connected to the anode of the first diode, and the second end of the secondary coil is connected to the anode of the second diode;

[0020] The anode of the third diode and the anode of the fourth diode are both connected to the second output end of the switching power supply.

[0021] In a second aspect, an embodiment of the present invention provides a method for controlling a switching power supply, which is applied to the switching power supply as described in any one of the first aspects above; comprising:

[0022] Obtaining a given output voltage value of the switching power supply;

[0023] According to the magnitude of the given value of the output voltage in the switching power supply, the switching states of the first switch and the second switch in each coil unit are adjusted to adjust the leakage inductance and the excitation inductance of the resonant network.

[0024] In a possible implementation, adjusting the switching states of the first switch and the second switch in each coil unit according to the magnitude of the given output voltage value in the switching power supply includes:

[0025] Determining a voltage range to which the output voltage given value belongs;

[0026] Determining the number of second primary coils that need to be connected in series with the first primary coil based on a preset voltage-switch table;

[0027] According to the number of second primary coils connected in series with the second primary coil as needed, the first switches in the corresponding coil units are controlled to be closed and the second switches to be opened.

[0028] In a possible implementation, adjusting the switching states of the first switch and the second switch in each coil unit according to the magnitude of the given output voltage value in the switching power supply includes:

[0029] determining a current switching frequency of the switching power supply according to the output voltage given value;

[0030] Searching for a minimum resonant frequency greater than the switching frequency from a preset resonant frequency table; the preset resonant frequency table stores a plurality of resonant frequencies that the resonant network can output;

[0031] Based on the formula Determine the target excitation inductance and target leakage inductance corresponding to the minimum resonant frequency, and determine the number of second primary coils that need to be connected in series with the second primary coil based on the target excitation inductance and target leakage inductance; wherein, f r Represents the resonant frequency, L r Indicates leakage inductance, L m Indicates the excitation inductance, C r represents the capacitance of the resonant network;

[0032] According to the number of the second primary coils, the first switches in the corresponding coil units are controlled to be closed and the second switches are controlled to be open.

[0033] In a third aspect, an embodiment of the present invention provides a controller comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method in any possible implementation manner of the first aspect is implemented.

[0034] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the method in any possible implementation of the first aspect above.

[0035] An embodiment of the present invention provides a switching power supply and its control method, controller, and readable storage medium. The switching power supply includes: a resonant network; the resonant network includes a transformer; the transformer includes a secondary coil and a primary coil module, the primary coil module includes a first primary coil and at least one coil unit; wherein each coil unit includes a second primary coil, a first switch, and a second switch; the first end of the first primary coil is the first end of the primary coil module, and the coil units are connected in series, and the first end after the series connection is connected to the second end of the first primary coil, and the second end after the series connection is the second end of the primary coil module; for any coil unit, the coil unit includes a first end and a second end, and the first end of the first switch and the first end of the second switch of the coil unit are both connected to the first end of the coil unit, the second end of the first switch of the coil unit is connected to the first end of the corresponding second primary coil, and the second end of the second switch of the coil unit and the second end of the second primary coil of the coil unit are both connected to the second end of the coil unit. The above structure, by configuring multiple primary coils on the primary side of the transformer, can achieve precise control of the excitation inductance and leakage inductance of the resonant network by adjusting the number of primary coils connected in series. In this way, the resonant frequency of the switching power supply can be effectively changed. Specifically, when the system needs to output low voltage, the resonant frequency can be increased by increasing the number of primary coils connected in series. This effectively avoids the problem of reduced switching power supply efficiency caused by switching frequencies exceeding the resonant frequency, significantly reducing energy losses during operation and improving its overall operating efficiency and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 1 is a schematic structural diagram of an existing LLC resonant conversion circuit provided by an embodiment of the present invention;

[0037] Figure 2 1 is a schematic structural diagram of an LLC resonant conversion circuit with adjustable resonant network parameters provided by an embodiment of the present invention;

[0038] Figure 3 1 is a flow chart of a method for controlling a switching power supply provided by an embodiment of the present invention;

[0039] Figure 4 1 is a schematic structural diagram of a control device for a switching power supply provided by an embodiment of the present invention;

[0040] Figure 5It is a schematic structural diagram of a controller provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] To help those skilled in the art better understand this solution, the following will clearly describe the technical solutions in the embodiments of this solution in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of this solution, not all of it. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of this solution.

[0042] Throughout the specification, claims, and accompanying figures of this solution, the term "including" and any variations thereof mean "including, but not limited to," and are intended to cover non-exclusive inclusions and are not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish between different objects, not to describe a specific order.

[0043] The following is a detailed description of the implementation of the present invention with reference to the accompanying drawings:

[0044] At present, the industry mainly uses several common topologies for high-frequency switching power supplies, including boost circuit, buck circuit, LLC resonant conversion circuit, phase-shifted full-bridge circuit, forward circuit and flyback circuit. Figure 1 , Figure 1 The following figure shows a common LLC resonant conversion circuit structure diagram. Figure 1 In the LLC circuit, the inductor, capacitor, and transformer components in the resonant network exist independently. Due to its zero-voltage switching (ZVS) characteristics, this circuit can significantly reduce switching losses and is widely used in high-efficiency power supply designs. However, its inherent drawback is that the output voltage range is narrow. When the LLC circuit needs to output a low voltage, the switching frequency (fsw) must be higher than the resonant frequency (fr), causing the circuit to enter the "capacitive region" operating mode. At this time, the parasitic capacitance of the switching tube cannot be fully discharged, causing hard switching, increasing losses and reducing reliability. In addition, the design of fixed resonant parameters (leakage inductance Lr, excitation inductance Lm, resonant capacitor Cr) is difficult to adapt to the requirements of a wide range of output voltages, especially in scenarios with fluctuating input voltages or dynamic load changes, which further deteriorates system performance.

[0045] Traditional solutions often extend the output range through multi-stage conversion or auxiliary circuits, but such methods increase system complexity and cost. For example:

[0046] Multi-stage LLC cascade: requires multiple sets of resonant cavities and independent control circuits, which is bulky and has limited efficiency.

[0047] Variable capacitance adjustment: Cr is adjusted through mechanical or electronic switches, but the capacitance switching response is slow and it is easy to introduce parasitic parameter interference.

[0048] Frequency conversion control relies solely on frequency regulation, but efficiency drops sharply when the frequency deviates beyond the resonant window. Therefore, a technical solution that can dynamically adjust the resonant parameters and maintain high-efficiency output over a wide range is urgently needed.

[0049] To address the limited output voltage range, low efficiency in low-voltage operating conditions, and poor reliability of existing LLC resonant converter circuits, embodiments of the present application provide a switching power supply that, by configuring multiple primary coils on the primary side of a transformer, can precisely control the magnetizing inductance and leakage inductance of the resonant network by adjusting the number of primary coils connected in series. This effectively changes the resonant frequency of the switching power supply, improving the efficiency of the LLC resonant converter circuit.

[0050] Figure 2 This is a schematic diagram of the structure of a switching power supply provided by an embodiment of the present invention. Figure 2 The switching power supply includes: a resonant network; the resonant network includes a transformer T1; the transformer T1 includes a secondary coil and a primary coil module, the primary coil module includes a first primary coil and at least one coil unit; wherein each coil unit includes a second primary coil, a first switch K1 and a second switch K2;

[0051] The first end of the first primary coil is the first end of the primary coil module, the coil units are connected in series, and the first end of the series connection is connected to the second end of the first primary coil, and the second end of the series connection is the second end of the primary coil module;

[0052] For any coil unit, the coil unit includes a first end and a second end, and the first end of the first switch K1 and the first end of the second switch K2 of the coil unit are both connected to the first end of the coil unit, the second end of the first switch K1 of the coil unit is connected to the first end of the corresponding second primary coil, and the second end of the second switch K2 of the coil unit and the second end of the second primary coil of the coil unit are both connected to the second end of the coil unit.

[0053] In this embodiment, the switching power supply may include a boost circuit, a buck circuit, an LLC resonant conversion circuit, a phase-shifted full-bridge circuit, a forward circuit, and a flyback circuit. This embodiment takes the LLC resonant conversion circuit as an example to explain the specific structure of the switching power supply.

[0054] Specifically, the switching power supply includes a resonant network, in which the resonant inductor and the transformer T1 are integrated together, and the leakage inductance of the transformer T1 is used to replace the resonant inductor in the circuit. The resonant inductance of the resonant network can be adjusted by adjusting the number of turns of the primary coil. The structure has a higher degree of integration and no longer requires a separate resonant inductor, which can improve the power density of the LLC resonant conversion circuit.

[0055] Secondly, in order to adjust the number of turns of the primary coil, this embodiment provides multiple second primary coils, and provides a first switch K1 and a second switch K2 between the multiple second primary coils. By adjusting the switching states of the first switch K1 and the second switch K2, the number of second primary coils connected in series with the first primary coil can be controlled, thereby controlling the number of turns of the primary coil of the transformer T1.

[0056] Specifically, multiple coil units are connected in series, and except for the first coil unit, the first end of each coil unit is connected to the second end of the previous coil unit. The first end of the first coil unit is connected to the second end of the first primary coil L1, and the second end of the last coil unit is the second end of the primary coil module. With this structure, the user can connect the desired number of coil turns by controlling the first switch K1 to close and the second switch K2 to open for each of the following coil units, starting with the first coil unit. The first switch K1 corresponding to the remaining unneeded coil units is then opened and the second switch K2 is closed, so that the second primary coil L2 corresponding to the required coil unit is connected in series with the first primary coil L1, achieving arbitrary changes in the number of primary coil turns.

[0057] As another embodiment, multiple coil units are connected in series, and except for the first coil unit, the second ends of the other coil units are connected to the first end of the previous coil unit, the second end of the first coil unit is connected to the second end of the first primary coil L1, and the first end of the last coil unit is the second end of the primary coil module.

[0058] With the above structure, the user can connect a desired number of coil turns by controlling the first switch K1 of each coil unit, closing the first switch K1 and opening the second switch K2, to connect the second primary coil L2 to the loop. The user can also disconnect the first switch K1 and close the second switch K2 of other unnecessary coil units, bypassing the unnecessary second primary coil L2. This allows for arbitrary changes in the number of primary coil turns.

[0059] Specifically, the leakage inductance Lr is determined by the total leakage magnetic flux of the primary coil and is proportional to the number of second primary coils L2 connected in series; the excitation inductance Lm is affected by the total number of turns of the primary coil, and its effective value can be adjusted by increasing or decreasing the number of second primary coils L2.

[0060] The expression of resonant frequency Fr is: By changing the combination of Lr and Lm, the resonant frequency range can be expanded to adapt to different output voltage requirements.

[0061] As can be seen from the above embodiment, the above structure, by configuring multiple primary coils on the primary side of transformer T1, can achieve precise control of the excitation inductance and leakage inductance of the resonant network by adjusting the number of primary coils connected in series. In this way, the resonant frequency of the switching power supply can be effectively changed. Specifically, when the system needs to output a low voltage, the resonant frequency can be increased by increasing the number of primary coils connected in series. This can effectively avoid the problem of reduced efficiency of the switching power supply due to the switching frequency being higher than the resonant frequency, thereby significantly reducing the energy loss of the switching power supply during operation and improving its overall operating efficiency and stability.

[0062] In one possible implementation, Figure 2 As shown, the resonant network further includes a first capacitor Cr; the first capacitor Cr and the primary coil module are connected in series.

[0063] As can be seen from the above embodiment, the first capacitor Cr is connected in series with the primary coil module, which is suitable for high voltage input scenarios and can reduce the capacitor withstand voltage requirement.

[0064] In a possible implementation, the resonant network further includes a first capacitor Cr;

[0065] The first capacitor Cr and the primary coil module are connected in parallel.

[0066] As can be seen from the above embodiment, the first capacitor Cr is connected in parallel across the primary coil, which is suitable for high current working conditions and reduces the influence of the capacitor equivalent series resistance (ESR).

[0067] In a possible implementation, the switching power supply further includes a primary switch module; the primary switch module includes a first switch bridge arm and a second switch bridge arm;

[0068] The first end of the first switch bridge arm and the first end of the second switch bridge arm are both connected to the first input end of the primary switch module, and the second end of the first switch bridge arm and the second end of the second switch bridge arm are both connected to the second input end of the primary switch module;

[0069] The midpoint of the first switch bridge arm is connected to the first end of the primary coil module;

[0070] A midpoint of the second switch bridge arm is connected to the second end of the primary coil module.

[0071] In this embodiment, the first switch bridge arm includes a first switch tube unit Q1 and a third switch tube unit Q3; the second switch bridge arm includes a second switch tube unit Q2 and a fourth switch tube unit Q4. The primary switch module also includes an input capacitor Cin. The first end of the input capacitor Cin, the first end of the first switch tube unit Q1, and the first end of the second switch tube unit Q2 are all connected to the first input end of the primary switch module. The second end of the first switch tube unit Q1 is connected to the first end of the third switch tube unit Q3, and the second end of the second switch tube unit Q2 is connected to the first end of the fourth switch tube unit Q4. The second end of the input capacitor Cin, the second end of the third switch tube unit Q3, and the second end of the fourth switch tube unit Q4 are all connected to the second input end of the primary switch module.

[0072] Specifically, each switch tube unit includes an IGBT switch tube, a capacitor, and a diode. The drain of the IGBT switch tube, one end of the capacitor, and the cathode of the diode are connected to the first end of the switch tube unit, and the source of the IGBT switch tube, the other end of the capacitor, and the anode of the diode are connected to the second end of the switch tube unit. The first end of the primary coil module is connected to the midpoint of the first switch bridge arm (the connection point between the first and second switch tube units), and the second end of the primary coil module is connected to the midpoint of the second switch bridge arm (the connection point between the third and fourth switch tube units).

[0073] In this embodiment, the gate of each IGBT switch tube is also connected to the corresponding pulse generator, and each pulse generator is connected to the controller. The controller is used to control the on and off of each IGBT switch tube, and the output voltage is controlled by controlling the on and off of the IGBT switch tube.

[0074] It can be seen from the above embodiments that the dual half-bridge structure of the primary switch module can reduce the current stress of a single switch tube and improve system reliability, and is particularly suitable for kilowatt-level high-power applications.

[0075] In a possible implementation, the switching power supply further includes a secondary side rectifier module;

[0076] The secondary side rectifier module includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4;

[0077] The cathode of the first diode D1 and the cathode of the second diode D2 are both connected to the first output terminal of the switching power supply;

[0078] The anode of the first diode D1 is connected to the cathode of the third diode D3, and the anode of the second diode D2 is connected to the cathode of the fourth diode D4;

[0079] The first end of the secondary coil is connected to the anode of the first diode D1, and the second end of the secondary coil is connected to the anode of the second diode D2;

[0080] The anode of the third diode D3 and the anode of the fourth diode D4 are both connected to the second output end of the switching power supply.

[0081] In this embodiment, the secondary rectifier module further includes an output capacitor Cout, one end of the output capacitor Cout is connected to the output end of the switching power supply, and the other end of the output capacitor Cout is connected to the second output end of the switching power supply.

[0082] In one embodiment, the switching power supply further includes a controller and a driver module. The controller is configured to control the on / off switching of switches Q1-Q4 using complementary PWM signals, generating a high-frequency square wave to excite the primary side of transformer T1. The controller is further configured to adjust the switching states of the first switch K1 and the second switch K2 in each coil unit based on a given output voltage.

[0083] refer to Figure 3 , Figure 3 A flow chart of a control method for a switching power supply provided by an embodiment of the present invention is shown. The control method is applied to the switching power supply described above and is described in detail as follows:

[0084] S101: Obtaining a given output voltage value of the switching power supply;

[0085] S102: According to the magnitude of the given value of the output voltage in the switching power supply, the switching states of the first switch K1 and the second switch K2 in each coil unit are adjusted to adjust the leakage inductance and the excitation inductance of the resonant network.

[0086] Specifically, in the control strategy of the switching power supply, the controller is used to obtain the output voltage set value of the switching power supply, and to sample the real-time output voltage actual value, and determine the voltage loop control quantity based on the difference between the output voltage actual value and the output voltage set value, determine the current loop set value based on the voltage loop control quantity, and sample the output current actual value of the switching power supply, and determine the target control quantity based on the difference between the current loop set value and the current loop actual value, determine the switching frequency of the primary switching module based on the target control quantity, and generate a PWM signal to control the primary switching module based on the switching frequency, and the switching frequency must be less than or equal to the resonant frequency of the resonant network.

[0087] In order to ensure that the switching frequency is less than or equal to the resonant frequency of the resonant network, this embodiment can calculate the switching frequency of the current cycle according to the output voltage given value after obtaining the output voltage given value, and adjust the switching state of the first switch K1 and the second switch K2 of each coil unit in the resonant network based on the switching frequency of the current cycle, so that the resonant frequency is greater than or equal to the switching frequency of the current cycle, thereby avoiding the problem of reduced efficiency of the switching power supply due to the switching frequency being higher than the resonant frequency, thereby significantly reducing the energy loss of the switching power supply during operation and improving its overall operating efficiency and stability.

[0088] In a possible implementation, the specific implementation process of S102 includes:

[0089] Determining a voltage range to which the output voltage given value belongs;

[0090] Determining the number of second primary coils that need to be connected in series with the first primary coil based on a preset voltage-switch table;

[0091] According to the number of second primary coils required to be connected in series with the second primary coil, the first switch K1 in the corresponding coil unit is controlled to be closed and the second switch K2 is controlled to be open.

[0092] In this embodiment, after adjusting the switch states of the first switch K1 and the second switch K2 in each coil unit, this embodiment can also calculate the turns ratio based on the excitation inductance of the primary coil and the inductance of the secondary coil before adjustment. Compared with network parameters Calculate the turns ratio based on the adjusted primary coil's magnetizing inductance and the secondary coil's inductance. Compared with network parameters Then, based on the turns ratio and network parameter ratio before and after adjustment, it is determined whether the adjusted resonant network parameters are optimal. If it is determined that the adjusted resonant network parameters are not good, the first switch K1 and the second switch K2 of each coil unit are readjusted.

[0093] In a possible implementation, another implementation process of S102 includes:

[0094] determining a current switching frequency of the switching power supply according to the output voltage given value;

[0095] Searching for a minimum resonant frequency greater than the switching frequency from a preset resonant frequency table; the preset resonant frequency table stores a plurality of resonant frequencies that the resonant network can output;

[0096] Based on the formula Determine the target excitation inductance and target leakage inductance corresponding to the minimum resonant frequency, and determine the number of second primary coils that need to be connected in series with the second primary coil based on the target excitation inductance and target leakage inductance; wherein, f r Represents the resonant frequency, L r Indicates leakage inductance, L m Indicates the excitation inductance, C r represents the capacitance of the resonant network;

[0097] According to the number of the second primary coils, the first switch K1 in the corresponding coil unit is controlled to be closed, and the second switch K2 is controlled to be open.

[0098] In this embodiment, multiple sets of coil units are provided to obtain multiple resonant frequencies of different sizes, so that the switching frequency can always be close to the resonant frequency but not greater than the resonant frequency, thereby maximizing the efficiency of the switching power supply.

[0099] In this embodiment, the controller uses an ARM Cortex-M series microprocessor coupled with a high-speed ADC (sampling rate 1MSPS) to acquire the actual output voltage Vout of the switching power supply in real time. The controller's memory stores a voltage-switching table and / or a resonant frequency table, and the processor outputs the switch drive signal via a GPIO.

[0100] As can be seen from the above embodiments, the switching power supply control method provided in this embodiment can support continuous output across a wide voltage range by dynamically adjusting the resonant parameters, effectively improving efficiency across the entire load range, with particularly significant advantages under low-voltage operating conditions. Furthermore, this embodiment can suppress the temperature rise of magnetic components, extending system life. Furthermore, the number of coil units in this embodiment can be increased or decreased as needed to accommodate different power levels.

[0101] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0102] The following is an embodiment of a control device for a switching power supply provided by the present invention. For details not described in detail, reference may be made to the corresponding method embodiments described above.

[0103] Figure 4 A schematic diagram of the structure of a control device for a switching power supply according to an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, which are described in detail as follows:

[0104] like Figure 4 As shown, the control device 100 of the switching power supply includes:

[0105] A voltage set value acquisition module 110 is used to obtain an output voltage set value of the switching power supply;

[0106] The switch switching module 120 is used to adjust the switching state of the first switch K1 and the second switch K2 in each coil unit according to the magnitude of the given value of the output voltage in the switching power supply, so as to adjust the leakage inductance and the excitation inductance of the resonant network.

[0107] In one possible implementation, the switch switching module 120 includes:

[0108] Determining a voltage range to which the output voltage given value belongs;

[0109] Determining the number of second primary coils that need to be connected in series with the first primary coil based on a preset voltage-switch table;

[0110] According to the number of second primary coils required to be connected in series with the second primary coil, the first switch K1 in the corresponding coil unit is controlled to be closed and the second switch K2 is controlled to be open.

[0111] In one possible implementation, the switch switching module 120 includes:

[0112] determining a current switching frequency of the switching power supply according to the output voltage given value;

[0113] Searching for a minimum resonant frequency greater than the switching frequency from a preset resonant frequency table; the preset resonant frequency table stores a plurality of resonant frequencies that the resonant network can output;

[0114] Based on the formula Determine the target excitation inductance and target leakage inductance corresponding to the minimum resonant frequency, and determine the number of second primary coils that need to be connected in series with the second primary coil based on the target excitation inductance and target leakage inductance; wherein, f r Represents the resonant frequency, L r Indicates leakage inductance, L m Indicates the excitation inductance, C r represents the capacitance of the resonant network;

[0115] According to the number of the second primary coils, the first switch K1 in the corresponding coil unit is controlled to be closed, and the second switch K2 is controlled to be open.

[0116] Figure 5 Schematic diagram of a controller provided by an embodiment of the present invention. Figure 5As shown, the controller 5 of this embodiment includes: a processor 50 and a memory 51. The memory 51 stores a computer program 52. When the processor 50 executes the computer program 52, the steps of the above-mentioned method embodiments are implemented. Alternatively, when the processor 50 executes the computer program 52, the functions of the modules / units in the above-mentioned device embodiments are implemented.

[0117] For example, the computer program 52 may be divided into one or more modules / units, which are stored in the memory 51 and executed by the processor 50 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program 52 in the controller 5.

[0118] The controller 5 may include, but is not limited to, a processor 50 and a memory 51. Those skilled in the art will appreciate that Figure 5 It is only an example of the controller 5 and does not constitute a limitation of the controller 5. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the controller 5 may also include input and output devices, network access devices, buses, etc.

[0119] The processor 50 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0120] The memory 51 can be an internal storage unit of the controller 5, such as the hard disk or memory of the controller 5. The memory 51 can also be an external storage device of the controller 5, such as a plug-in hard disk, a SmartMedia Card (SMC), a Secure Digital (SD) card, a flash memory card, etc. equipped on the controller 5. Furthermore, the memory 51 can include both the internal storage unit of the controller 5 and an external storage device. The memory 51 is used to store the computer program 52 and other programs and data required by the controller 5. The memory 51 can also be used to temporarily store data that has been output or is about to be output.

[0121] For the sake of convenience and brevity, the division of the above functional modules / units is only used as an example. In actual applications, the above functions can be assigned to different functional modules / units as needed. The above modules / units can be implemented in the form of hardware, software, or a combination of hardware and software.

[0122] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the methods in the above-mentioned method embodiments.

[0123] An embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements the methods in the above-mentioned method embodiments.

[0124] The computer program includes computer program code, which may be in source code form, object code form, executable file, or some intermediate form. Computer-readable media may include any entity or device capable of carrying computer program code, recording media, USB flash drives, mobile hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunications signals, and software distribution media.

[0125] In the above embodiments, the descriptions of each embodiment have their own focus. For parts not described or recorded in detail in one embodiment, please refer to the relevant descriptions of other embodiments. Unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other. The technical features of different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0126] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A switching power supply, characterized in that: include: A resonant network; the resonant network includes a transformer; the transformer includes a secondary coil and a primary coil module, the primary coil module includes a first primary coil and at least one coil unit; wherein each coil unit includes a second primary coil, a first switch and a second switch; The first end of the first primary coil is the first end of the primary coil module, the coil units are connected in series, and the first end of the series connection is connected to the second end of the first primary coil, and the second end of the series connection is the second end of the primary coil module; For any coil unit, the coil unit includes a first end and a second end, and the first end of the first switch and the first end of the second switch of the coil unit are both connected to the first end of the coil unit, the second end of the first switch of the coil unit is connected to the first end of the corresponding second primary coil, and the second end of the second switch of the coil unit and the second end of the second primary coil of the coil unit are both connected to the second end of the coil unit.

2. The switching power supply according to claim 1, characterized in that: The resonant network further includes a first capacitor; The first capacitor and the primary coil module are connected in series.

3. The switching power supply according to claim 1, wherein: The resonant network further includes a first capacitor; The first capacitor and the primary coil module are connected in parallel.

4. The switching power supply according to claim 1, wherein: The switching power supply further includes a primary switch module; the primary switch module includes a first switch bridge arm and a second switch bridge arm; The first end of the first switch bridge arm and the first end of the second switch bridge arm are both connected to the first input end of the primary switch module, and the second end of the first switch bridge arm and the second end of the second switch bridge arm are both connected to the second input end of the primary switch module; The midpoint of the first switch bridge arm is connected to the first end of the primary coil module; A midpoint of the second switch bridge arm is connected to the second end of the primary coil module.

5. The switching power supply according to claim 1, wherein: The switching power supply further includes a secondary side rectifier module; The secondary side rectifier module includes a first diode, a second diode, a third diode and a fourth diode; The cathode of the first diode and the cathode of the second diode are both connected to the first output terminal of the switching power supply; The anode of the first diode is connected to the cathode of the third diode, and the anode of the second diode is connected to the cathode of the fourth diode; The first end of the secondary coil is connected to the anode of the first diode, and the second end of the secondary coil is connected to the anode of the second diode; The anode of the third diode and the anode of the fourth diode are both connected to the second output end of the switching power supply.

6. A method for controlling a switching power supply, characterized in that: Applicable to the switching power supply according to any one of claims 1 to 4; comprising: Obtaining a given output voltage value of the switching power supply; According to the magnitude of the given value of the output voltage in the switching power supply, the switching states of the first switch and the second switch in each coil unit are adjusted to adjust the leakage inductance and the excitation inductance of the resonant network.

7. The method for controlling a switching power supply according to claim 6, wherein: The step of adjusting the switching states of the first switch and the second switch in each coil unit according to the given value of the output voltage in the switching power supply includes: Determining a voltage range to which the output voltage given value belongs; Determining the number of second primary coils that need to be connected in series with the first primary coil based on a preset voltage-switch table; According to the number of second primary coils connected in series with the second primary coil as needed, the first switches in the corresponding coil units are controlled to be closed and the second switches to be opened.

8. The method for controlling a switching power supply according to claim 6, wherein: The step of adjusting the switching states of the first switch and the second switch in each coil unit according to the given value of the output voltage in the switching power supply includes: determining a current switching frequency of the switching power supply according to the output voltage given value; Searching for a minimum resonant frequency greater than the switching frequency from a preset resonant frequency table; the preset resonant frequency table stores a plurality of resonant frequencies that the resonant network can output; Based on the formula Determine the target excitation inductance and target leakage inductance corresponding to the minimum resonant frequency, and determine the number of second primary coils that need to be connected in series with the second primary coil based on the target excitation inductance and target leakage inductance; wherein, f r Indicates the resonant frequency, L r Indicates leakage inductance, L m Indicates the excitation inductance, C r represents the capacitance of the resonant network; According to the number of the second primary coils, the first switches in the corresponding coil units are controlled to be closed and the second switches are controlled to be open.

9. A controller, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method according to any one of claims 6 to 8 is implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 6 to 8 is implemented.

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