Circuit starting method, apparatus, transformer circuit, device, medium, and program product

Abstract

Embodiments of the present application relate to a circuit starting method and device, a voltage conversion circuit, equipment, a medium and a program product. The method is applied to a voltage conversion circuit, which includes a full-bridge circuit and a resonant circuit connected to the full-bridge circuit. The method includes: inputting a driving signal PWM1, a driving signal PWM2, a driving signal PWM3 and a driving signal PWM4 to the switch tubes in the full-bridge circuit respectively; wherein the phase of the driving signal PWM1 and the driving signal PWM4 is complementary, and the phase of the driving signal PWM2 and the driving signal PWM3 is complementary; adjusting the phase of the driving signals of two switch tubes in the full-bridge circuit, so that the driving signal PWM1 and the driving signal PWM4 have the same phase, and the driving signal PWM2 and the driving signal PWM3 have the same phase, to start the resonant circuit. The method can protect the devices of the resonant circuit.

Description

Technical Field

[0001] This application relates to the field of circuit startup technology, and in particular to a circuit startup method, apparatus, transformer circuit, device, medium, and program product. Background Technology

[0002] LLC topology is a commonly used topology in DC-DC (Direct Current-to-Direct Current) converters. An LLC topology typically includes a half-bridge (or full-bridge) rectifier circuit, a resonant circuit, a transformer circuit, and a synchronous rectified output circuit. The resonant circuit may include a resonant inductor, the primary winding of the transformer, and a resonant capacitor. Currently, high-frequency soft-start is often used to protect the components in the resonant circuit, preventing excessive current surges from the capacitive load during startup.

[0003] High-frequency soft-start methods typically require a relatively large resonant inductor. However, with the increasing demand for smaller sizes, the resonant inductor has become smaller, thus weakening the device protection provided by high-frequency soft-start methods. Summary of the Invention

[0004] This application provides a circuit startup method, apparatus, transformer circuit, device, medium, and program product that can achieve soft startup of resonant circuits while protecting the devices in the resonant circuits.

[0005] In a first aspect, embodiments of this application provide a circuit startup method applied to a transformer circuit, the transformer circuit including a full-bridge circuit and a resonant circuit connected to the full-bridge circuit, the method comprising:

[0006] The driving signals PWM1, PWM2, PWM3 and PWM4 are respectively input to the switching transistors in the full-bridge circuit; wherein the phases of driving signals PWM1 and PWM4 are complementary, and the phases of driving signals PWM2 and PWM3 are complementary.

[0007] Adjust the phase of the drive signals of the two switching transistors in the full-bridge circuit so that drive signal PWM1 and drive signal PWM4 are in phase, and drive signal PWM2 and drive signal PWM3 are in phase, so as to start the resonant circuit.

[0008] Secondly, embodiments of this application provide a circuit starting device applied to a transformer circuit, the transformer circuit including a full-bridge circuit and a resonant circuit connected to the full-bridge circuit, the device comprising:

[0009] The signal input module is used to input drive signals PWM1, PWM2, PWM3 and PWM4 to the switching transistors in the full-bridge circuit respectively; wherein, drive signals PWM1 and PWM4 are complementary in phase, and drive signals PWM2 and PWM3 are complementary in phase.

[0010] The phase adjustment module is used to adjust the phase of the drive signals of the two switching transistors in the full-bridge circuit so that the drive signals PWM1 and PWM4 are in phase, and the drive signals PWM2 and PWM3 are in phase, so as to start the resonant circuit.

[0011] Thirdly, embodiments of this application provide a transformer circuit, which includes a full-bridge circuit and a resonant circuit connected to the full-bridge circuit;

[0012] The input signals of the switching transistors in the full-bridge circuit are drive signals PWM1, PWM2, PWM3 and PWM4, respectively; among them, drive signals PWM1 and PWM4 are complementary in phase, and drive signals PWM2 and PWM3 are complementary in phase.

[0013] In the full-bridge circuit, the phases of the drive signals for the two switching transistors are adjusted so that drive signal PWM1 and drive signal PWM4 are in phase, and drive signal PWM2 and drive signal PWM3 are in phase, in order to start the resonant circuit.

[0014] Fourthly, embodiments of this application provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in the first aspect above.

[0015] Fifthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method described in the first aspect above.

[0016] In a sixth aspect, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the method described in the first aspect above.

[0017] The circuit startup method, apparatus, transformer circuit, device, medium, and program product provided in this application embodiment input drive signals PWM1, PWM2, PWM3, and PWM4 to the switching transistors in the full-bridge circuit, respectively; adjust the phase of the drive signals of the two switching transistors in the full-bridge circuit so that drive signals PWM1 and PWM4 are in phase, and drive signals PWM2 and PWM3 are in phase, thereby starting the resonant circuit. This application embodiment, by adjusting the phase of the drive signals of the two switching transistors in the full-bridge circuit, gradually increases the conduction time of each pair of transistors in the full-bridge circuit, thereby gradually increasing the energy input to the resonant circuit. Therefore, it can avoid voltage or current impact on the devices in the resonant circuit, and better protect the devices in the resonant circuit. Attached Figure Description

[0018] Figure 1a This is a schematic diagram of an LLC topology in the prior art;

[0019] Figure 1b This is a schematic diagram of a transformer circuit in one embodiment;

[0020] Figure 2 This is a flowchart illustrating a circuit startup method in one embodiment;

[0021] Figure 3 This is one of the schematic diagrams of the drive signals in one embodiment;

[0022] Figure 4 This is a second schematic diagram of the drive signals in one embodiment;

[0023] Figure 5 This is the third schematic diagram of the drive signals in one embodiment;

[0024] Figure 6 This is a fourth schematic diagram of the drive signals in one embodiment;

[0025] Figure 7 This is one of the structural block diagrams of the circuit starting device in one embodiment;

[0026] Figure 8 This is a second structural block diagram of the circuit starting device in one embodiment;

[0027] Figure 9 This is a diagram of the internal structure of an electronic device in one embodiment. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of this application and are not intended to limit the embodiments of this application.

[0029] First, before introducing the technical solutions of the embodiments of this application in detail, let's first introduce the technical background or technical evolution on which the embodiments of this application are based. LLC topology is a common DC-DC topology. LLC topology generally includes a half-bridge (or full-bridge) rectifier circuit, a resonant circuit, a transformer circuit, and a synchronous rectifier output circuit, etc. For example... Figure 1a As shown, the existing LLC topology includes switching transistors M1 and M2, resonant inductor Ls, transformer primary winding Lm, resonant capacitor Cs, input capacitor C1, output capacitor cluster C2, diodes D1 and D2. The resonant inductor Ls, transformer primary winding Lm, and resonant capacitor Cs form a resonant circuit. Currently, high-frequency soft-start is commonly used to protect the devices in the resonant circuit, preventing excessive current surges from the capacitive load during startup. However, high-frequency soft-start typically requires a relatively large resonant inductor. But with the need for smaller size, the resonant inductor is becoming smaller, and the device protection provided by high-frequency soft-start is weakened accordingly.

[0030] This application provides a circuit soft-start scheme applied to a transformer circuit, which includes a full-bridge circuit and a resonant circuit. Drive signals PWM1, PWM2, PWM3, and PWM4 are input to the switching transistors in the full-bridge circuit. The phases of the drive signals for two switching transistors in the full-bridge circuit are adjusted so that drive signals PWM1 and PWM4 are in phase, and drive signals PWM2 and PWM3 are in phase, thereby starting the resonant circuit. By adjusting the phases of the drive signals, this application allows the conduction time of each pair of transistors in the full-bridge circuit to gradually increase, thus allowing energy to gradually enter the resonant circuit. This reduces the impact of voltage or current on the components in the resonant circuit, thereby better protecting the components.

[0031] The technical solutions involved in the embodiments of this application will be described below in conjunction with the application scenarios.

[0032] The circuit startup method provided in this application embodiment, by way of example, can be applied to, for example, Figure 1bThe transformer circuit shown is a full-bridge circuit and a resonant circuit connected to the full-bridge circuit. The full-bridge circuit includes switching transistors Q1, Q2, Q3, and Q4, and the resonant circuit includes a resonant inductor Lr, a transformer primary winding Lm, and a resonant capacitor Cr. Switches Q1 and Q4 are paired, as are switches Q2 and Q3. When both switches Q1 and Q4 are turned on, a closed circuit is formed by switches Q1, the resonant capacitor Cr, the transformer primary winding Lm, the resonant inductor Lr, and switches Q4. When both switches Q2 and Q3 are turned on, a closed circuit is formed by switches Q2, the resonant inductor Lr, the transformer primary winding Lm, the resonant capacitor Cr, and switches Q3. The transformer circuit may also include an input terminal Vin connected to the full-bridge circuit, an output terminal Vout connected to the resonant circuit, and other components such as input and output capacitors. This embodiment does not limit the structure of the transformer circuit.

[0033] In one embodiment, such as Figure 2 As shown, a circuit startup method is provided, which is applied to... Figure 1b Taking the transformer circuit in the example, the explanation includes the following steps:

[0034] Step 101: Input drive signals PWM1, PWM2, PWM3 and PWM4 to the switching transistors in the full-bridge circuit respectively.

[0035] The drive signals PWM1, PWM2, PWM3 and PWM4 are respectively input to the switching transistors in the full-bridge circuit.

[0036] like Figure 3 As shown, the drive signal PWM1 of switch Q1 is complementary to the drive signal PMW4 of switch Q4, and the drive signal PMW2 of switch Q2 is complementary to the drive signal PMW3 of switch Q3; furthermore, the drive signal PWM1 of switch Q1 is in phase with the drive signal PWM2 of switch Q2. In this situation, switches Q1 and Q4 are not simultaneously turned on, and are temporarily not connected to the resonant circuit; switches Q2 and Q3 are also not simultaneously turned on, and are also temporarily not connected to the resonant circuit.

[0037] Step 102: Adjust the phase of the drive signals of the two switching transistors in the full-bridge circuit so that the drive signals PWM1 and PWM4 are in the same phase, and the drive signals PWM2 and PWM3 are in the same phase, so as to start the resonant circuit.

[0038] Adjust the phase of the drive signals for the two switches in the full-bridge circuit. Specifically, adjust the phase of drive signal PWM1 or drive signal PWM4 to control switches Q1 and Q4 to conduct simultaneously, thus creating a path between switch Q1, the resonant capacitor, the primary winding of the transformer, the resonant inductor, and switch Q4. Adjust the phase of drive signal PWM2 or drive signal PWM3 to control switches Q2 and Q3 to conduct simultaneously, thus creating a path between switch Q2, the resonant inductor, the primary winding of the transformer, the resonant capacitor, and switch Q3.

[0039] By gradually adjusting the phase of the drive signals, the duration of simultaneous conduction of each pair of transistors in the full-bridge circuit is gradually increased. This creates a path with the resonant circuit when each pair of transistors is simultaneously conducting, thus gradually increasing the energy input to the resonant circuit. The phase adjustment ends when drive signals PWM1 and PWM4 are in phase, and drive signals PWM2 and PWM3 are in phase, at which point the resonant circuit starts and operates normally.

[0040] like Figure 4 As shown, by adjusting the phase of the drive signal, the phases of the drive signal PWM2 for switch Q2 and the drive signal PWM4 for switch Q4 can both be shifted to the right by 'a'. Then, the duration for which switches Q1 and Q4 are simultaneously turned on is the duration T1 between the initial phase and phase 'a', for example, 5ns. The duration for which switches Q2 and Q3 are simultaneously turned on is also the duration T2 between the initial phase and phase 'a'.

[0041] like Figure 5 As shown, if the phases of the drive signals PWM2 and PWM4 of switch Q2 are both shifted to the right by 'a', then the duration for which switches Q1 and Q4 are simultaneously turned on is the duration between the initial phase and phase 2a, for example, 10ns. The duration for which switches Q2 and Q3 are simultaneously turned on is also the duration between the initial phase and phase 2a.

[0042] like Figure 6 As shown, after the phase adjustment is completed, the drive signal PWM1 of switch Q1 is in phase with the drive signal PWM4 of switch Q4, and the drive signal PWM2 of switch Q2 is in phase with the drive signal PWM3 of switch Q3; furthermore, the drive signal PWM1 of switch Q1 and the drive signal PWM3 of switch Q3 are complementary in phase, and the drive signal PWM2 of switch Q2 and the drive signal PWM4 of switch Q4 are complementary in phase.

[0043] In the above embodiments, drive signals PWM1, PWM2, PWM3, and PWM4 are input to the switching transistors in the full-bridge circuit, respectively. The phases of the drive signals of two switching transistors in the full-bridge circuit are adjusted so that drive signals PWM1 and PWM4 are in phase, and drive signals PWM2 and PWM3 are in phase, thereby starting the resonant circuit. This embodiment of the application gradually increases the conduction time of each pair of transistors in the full-bridge circuit by adjusting the phases of the drive signals, thereby gradually increasing the energy input to the resonant circuit. Therefore, it can avoid voltage or current impacts on the devices in the resonant circuit, thus better protecting the devices in the resonant circuit.

[0044] Based on the above embodiments, the embodiments of this application may further include the following steps: adjusting the phase of the driving signal PWM4 and the driving signal PWM2 according to a preset first phase step size, so that the driving signal PWM1 and the driving signal PWM4 are in the same phase, and the driving signal PWM2 and the driving signal PWM3 are in the same phase.

[0045] A first phase step size is preset, for example, the first phase step size is 30° or 60°. This application embodiment does not limit the first phase step size and can set it according to actual conditions. It should be noted that when the drive signal PWM4 and drive signal PWM2 adjust their phases, the same first phase step size is used to avoid simultaneous conduction of switching transistors Q4 and Q2, which would cause a short circuit in the bridge arm containing switching transistors Q4 and Q2.

[0046] The phases of drive signals PWM4 and PWM2 are adjusted according to the first phase step size. For example, if the first phase step size is 60°, then drive signals PWM4 and PWM2 with a phase of 60° can be obtained. Figure 4 As shown.

[0047] In practical applications, a 0° phase drive signal is input to one switch in each pair of transistors in the full-bridge circuit, while a phase-adjusted drive signal is input to the other switch in each pair. Because the phases of the input drive signals to the two switches are different, both switches only conduct simultaneously when both input drive signals are high. Thus, as the phase of the input drive signal to the other switch in each pair changes, the duration of simultaneous conduction in each pair gradually increases, and the energy of the input resonant circuit also gradually increases.

[0048] For example, drive signals PWM1 and PWM3 with a phase of 0° are input to switches Q1 and Q3, respectively. Drive signals PWM2 and PWM4 with a phase of 60° are then input to switches Q2 and Q4. When both drive signals PWM1 and PWM4 are high, switches Q1 and Q4 are simultaneously turned on (time period T1), and a circuit is formed between switches Q1, resonant capacitor Cr, transformer primary winding Lm, resonant inductor Lr, and switch Q4. When both drive signals PWM2 and PWM3 are high, switches Q2 and Q3 are simultaneously turned on (time period T2), and a circuit is formed between switches Q2, resonant inductor Lr, transformer primary winding Lm, resonant capacitor Cr, and switch Q3.

[0049] After a first preset time interval, phase adjustment is performed again, so that the phase of the drive signal PWM2 of switch Q2 and the drive signal PWM4 of switch Q4 is 120°. The duration for which the drive signal PWM1 of switch Q1 and the drive signal PWM4 of switch Q4 are both high increases, the duration for which switch Q1 and switch Q4 are simultaneously turned on (time period T1) increases, the duration for which the drive signal PWM2 of switch Q2 and the drive signal PWM3 of input switch Q3 are both high also increases, the duration for which switch Q2 and switch Q3 are simultaneously turned on (time period T2) also increases, and the energy input to the resonant circuit increases.

[0050] After a first preset time interval, the phase of the drive signal PWM2 of switch Q2 and the drive signal PWM4 of switch Q4 is 180°. The duration for which the drive signal PWM1 of switch Q1 and the drive signal PWM4 of switch Q4 are both high is further increased. The duration for which switch Q1 and switch Q4 are simultaneously turned on (time period T1) is further increased. The duration for which the drive signal PWM2 of switch Q2 and the drive signal PWM3 of switch Q3 are both high is also further increased. The duration for which switch Q2 and switch Q3 are simultaneously turned on (time period T2) is also further increased, and the energy input to the resonant circuit is further increased.

[0051] The aforementioned first preset duration can be determined based on the frequency or time period of the driving signal, such as performing a phase adjustment every 100 time periods. This application embodiment does not limit the first preset duration.

[0052] In the above embodiments, the phases of drive signals PWM4 and PWM2 are adjusted according to a preset first phase step size, so that drive signals PWM1 and PWM4 are in phase, and drive signals PWM2 and PWM3 are in phase. This embodiment of the application, through phase adjustment, gradually increases the conduction time of each pair of transistors in the full-bridge circuit, thereby increasing the time for the full-bridge circuit and resonant circuit to form a path, and further gradually increasing the energy input to the resonant circuit. This avoids voltage or current impacting the devices in the resonant circuit, thus better protecting the devices in the resonant circuit.

[0053] Based on the above embodiments, the embodiments of this application may further include: adjusting the phase of the driving signal PWM4 and the driving signal PWM2 according to the first phase step size and the preset first frequency step size respectively.

[0054] During the phase adjustment process, the frequency of the drive signal can also be adjusted. The adjustment process may include: gradually adjusting the phase along a preset phase direction according to a first phase step size, and gradually decreasing the frequencies of drive signal PWM4 and drive signal PWM2 according to a first frequency step size.

[0055] For example, the first phase step size is 'a', the first frequency step size is 'f1', and the preset phase direction is a positive phase direction. The adjustment process may include: first, determining the phases of the phase-adjusted drive signals PWM4 and PWM2 as a, 2a, 3a, ... based on the first phase step size 'a'; then, decreasing the frequencies of the drive signals PWM4 and PWM2 respectively based on the first frequency step size 'f1'. This application embodiment does not limit the first phase step size and the first frequency step size. The preset phase direction can also be a negative phase direction, and this application embodiment does not limit this.

[0056] In the above embodiments, the phases of the drive signals PWM4 and PWM2 are adjusted according to the first phase step size and the preset first frequency step size, respectively. Through the embodiments of this application, the phase and frequency of the drive signals can be adjusted, thereby gradually increasing the energy of the input resonant circuit, achieving a soft-start effect for the resonant circuit, and reducing the number of switching operations of the switching transistors in the full-bridge circuit, thus reducing the power consumption of the transformer circuit.

[0057] In practical applications, the phases of the drive signals for switching transistors Q2 and Q4 can be adjusted, as can the phases of the drive signals for switching transistors Q1 and Q3. Therefore, based on the above embodiments, this application embodiment may further include the following steps: adjusting the phases of drive signals PWM1 and PWM3 according to a preset second phase step size, so that drive signals PWM1 and PWM4 are in phase, and drive signals PWM2 and PWM3 are in phase.

[0058] In this embodiment, a second phase step size is preset, for example, the second phase step size is 30° or 60°. This embodiment does not limit the second phase step size and it can be set according to actual conditions.

[0059] It should be noted that when the drive signals PWM1 and PWM3 are phase-adjusted, the same second phase step size is used to avoid simultaneous conduction of switches Q1 and Q3, which would cause a short circuit in the bridge arm containing switches Q1 and Q3. Furthermore, the aforementioned second phase step size can be the same as or different from the first phase step size; this embodiment does not limit this.

[0060] The phases of drive signals PWM1 and PWM3 are adjusted according to the second phase step size. For example, drive signals PWM1 and PWM3 with a phase of 0° are input to switches Q2 and Q4 respectively. First, drive signals PWM1 and PWM3 with a phase of 0° are input to switches Q1 and Q3. When both drive signals PWM1 and PWM4 of switch Q1 and Q4 are high, switches Q1 and Q4 are simultaneously turned on (time period T1), and a path is formed between switch Q1, resonant capacitor Cr, transformer primary side Lm, resonant inductor Lr, and switch Q4. When both drive signals PWM2 and PWM3 of switch Q2 and Q3 are high, switches Q2 and Q3 are simultaneously turned on (time period T2), and a path is formed between switch Q2, resonant inductor Lr, transformer primary side Lm, resonant capacitor Cr, and switch Q3.

[0061] After a second preset time interval, phase adjustment is performed again. The phase of the drive signal PWM1 of switch Q1 and the drive signal PWM3 of switch Q3 is 60°. The duration of both drive signal PWM1 of switch Q1 and drive signal PWM4 of switch Q4 being high increases. The duration of switch Q1 and switch Q4 being simultaneously turned on (time period T1) increases. The duration of both drive signal PWM2 of switch Q2 and drive signal PWM3 of input switch Q3 being high also increases. The duration of switch Q2 and switch Q3 being simultaneously turned on (time period T2) also increases. The energy input to the resonant circuit increases.

[0062] After a second preset time interval, the phase of the drive signal PWM1 of switch Q1 and the drive signal PWM3 of switch Q3 is 90°. The duration for which the drive signal PWM1 of switch Q1 and the drive signal PWM4 of switch Q4 are both at a high level is further increased. The duration for which switch Q1 and switch Q4 are simultaneously turned on (time period T1) is further increased. The duration for which the drive signal PWM2 of switch Q2 and the drive signal PWM3 of switch Q3 are both at a high level is also further increased. The duration for which switch Q2 and switch Q3 are simultaneously turned on (time period T2) is also further increased. The energy input into the resonant circuit is further increased.

[0063] The aforementioned second preset duration can be determined based on the frequency or time period of the driving signal, such as performing a phase adjustment every 50 time periods. This application embodiment does not limit the second preset duration.

[0064] In the above embodiments, the phases of drive signals PWM1 and PWM3 are adjusted according to a preset second phase step size, so that drive signals PWM1 and PWM4 are in phase, and drive signals PWM2 and PWM3 are in phase. This embodiment of the application, through phase adjustment, gradually increases the conduction time of each pair of transistors in the full-bridge circuit, thereby increasing the time for the full-bridge circuit and resonant circuit to form a path, and further gradually increasing the energy input to the resonant circuit. This avoids voltage or current impacting the devices in the resonant circuit, thus better protecting the devices in the resonant circuit.

[0065] Based on the above embodiments, the embodiments of this application may further include: adjusting the phase of the drive signal PWM1 and the drive signal PWM3 according to the second phase step size and the preset second frequency step size.

[0066] During the phase adjustment process, the frequency of the drive signal can also be adjusted. The adjustment process may include: gradually adjusting the phase along a preset phase direction according to a second phase step size, and gradually decreasing the frequencies of drive signals PWM1 and PWM3 according to a second frequency step size. The adjustment method can refer to the adjustment of drive signals PWM2 and PWM4 described above, and will not be repeated here in the embodiments of this application.

[0067] In the above embodiments, the phases of drive signals PWM1 and PWM3 are adjusted according to the second phase step size and the preset second frequency step size. Through the embodiments of this application, the phase and frequency of the drive signals can be adjusted, thereby gradually increasing the energy of the input resonant circuit, achieving a soft-start effect for the resonant circuit, and also allowing the operating frequency of the resonant circuit to be lower than the startup frequency, thereby reducing the power consumption of the resonant circuit.

[0068] In one embodiment, based on the above embodiments, the present application embodiment may further include: after the resonant circuit is started, reducing the frequencies of drive signals PWM1, PWM2, PWM3 and PWM4 respectively.

[0069] In practical applications, the resonant circuit is typically started at a higher frequency to ensure its operation in coordination with the resonant inductor, thus protecting the circuit. After startup, it operates at a lower frequency. Therefore, after the resonant circuit starts, the frequencies of the drive signals PWM1, PWM2, PWM3, and PWM4 are reduced respectively, so that the operating frequency of the resonant circuit is lower than its startup frequency.

[0070] For example, after phase adjustment, the frequencies of drive signals PWM1, PWM2, PWM3, and PWM4 are all 400kHz; then, the frequencies of the drive signals are reduced so that the frequencies of drive signals PWM1, PWM2, PWM3, and PWM4 are all 100kHz.

[0071] In one scenario, the frequency is not adjusted during the adjustment of the phase of the drive signal; instead, the frequency of the drive signal is reduced after the resonant circuit is activated.

[0072] In another scenario, the frequency is adjusted simultaneously while adjusting the phase of the drive signal; after the resonant circuit is activated, the frequency of the drive signal is reduced again.

[0073] This application does not limit the scenarios for frequency adjustment; settings can be made according to actual conditions.

[0074] In the above embodiments, after the resonant circuit starts up, the frequencies of drive signals PWM1, PWM2, PWM3, and PWM4 are reduced respectively. Reducing the frequency of the drive signals after the resonant circuit starts up reduces the number of switching operations of the switching transistors, thereby reducing the power consumption of the transformer circuit.

[0075] In one embodiment, the present application embodiment may further include: reducing the frequencies of drive signals PWM1, PWM2, PWM3 and PWM4 respectively according to a preset third frequency step.

[0076] A third frequency step size is preset. After the resonant circuit is started, the frequencies of drive signals PWM1, PWM2, PWM3 and PWM4 are gradually reduced according to the third frequency step size.

[0077] For example, after phase adjustment, the frequency of the drive signals is 400kHz, and the third frequency step is 100kHz. Then, according to the third frequency step, the frequencies of drive signals PWM1, PWM2, PWM3, and PWM4 are reduced to 300kHz. After a third preset time interval, the frequencies of drive signals PWM1, PWM2, PWM3, and PWM4 are reduced again to 200kHz. This process continues until the frequencies of drive signals PWM1, PWM2, PWM3, and PWM4 are reduced to 100kHz.

[0078] The aforementioned third preset duration can be determined based on the frequency and time period of the driving signal; for example, the frequency can be reduced once every 100 time periods. This application embodiment does not limit the third preset duration and can set it according to actual conditions.

[0079] In the above embodiments, the frequencies of drive signals PWM1, PWM2, PWM3, and PWM4 are reduced according to a preset third frequency step size. In this embodiment, after the resonant circuit is started, the resonant circuit operates at a lower frequency, which reduces the number of switching operations of the switching transistors in the full-bridge circuit, thereby reducing the power consumption of the transformer circuit.

[0080] It should be understood that, although Figures 2 to 6 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figures 2 to 6 At least some of the steps in the process may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.

[0081] In one embodiment, such as Figure 7 As shown, a circuit starting device is provided, applied to a transformer circuit, the transformer circuit including a full-bridge circuit and a resonant circuit connected to the full-bridge circuit. The device includes:

[0082] The signal input module 301 is used to input drive signals PWM1, PWM2, PWM3 and PWM4 to the switching transistors in the full-bridge circuit respectively; wherein, the phases of drive signals PWM1 and PWM4 are complementary, and the phases of drive signals PWM2 and PWM3 are complementary.

[0083] The phase adjustment module 302 is used to adjust the phase of the drive signals of the two switching transistors in the full-bridge circuit so that the drive signals PWM1 and PWM4 are in the same phase, and the drive signals PWM2 and PWM3 are in the same phase, so as to start the resonant circuit.

[0084] In one embodiment, the phase adjustment module 302 is specifically used to adjust the phase of the drive signal PWM4 and the drive signal PWM2 according to a preset first phase step, so that the drive signal PWM1 and the drive signal PWM4 are in the same phase, and the drive signal PWM2 and the drive signal PWM3 are in the same phase.

[0085] In one embodiment, the phase adjustment module 302 is specifically used to adjust the phase of the drive signal PWM4 and the drive signal PWM2 according to the first phase step and the preset first frequency step, respectively.

[0086] In one embodiment, the phase adjustment module 302 is specifically used to adjust the phase of the drive signal PWM1 and the drive signal PWM3 according to a preset second phase step size, so that the drive signal PWM1 and the drive signal PWM4 are in the same phase, and the drive signal PWM2 and the drive signal PWM3 are in the same phase.

[0087] In one embodiment, the phase adjustment module 302 is specifically used to adjust the phase of the drive signal PWM1 and the drive signal PWM3 according to the second phase step and the preset second frequency step.

[0088] In one embodiment, such as Figure 8 As shown, the device also includes:

[0089] The frequency reduction module 303 is used to reduce the frequencies of drive signals PWM1, PWM2, PWM3 and PWM4 respectively after the resonant circuit is started.

[0090] In one embodiment, the frequency reduction module 303 is specifically used to reduce the frequencies of drive signals PWM1, PWM2, PWM3 and PWM4 respectively according to a preset third frequency step.

[0091] In one embodiment, the full-bridge circuit includes switching transistors Q1, Q2, Q3, and Q4, and the resonant circuit includes a resonant inductor, the primary side of a transformer, and a resonant capacitor.

[0092] The phase adjustment module is specifically used to adjust the phase of the drive signal PWM1 or the phase of the drive signal PWM4, controlling the simultaneous conduction of switch Q1 and switch Q4, so that switch Q1, resonant capacitor, transformer primary side, resonant inductor and switch Q4 form a path; and to adjust the phase of the drive signal PWM2 or the phase of the drive signal PWM3, controlling the simultaneous conduction of switch Q2 and switch Q3, so that switch Q2, resonant inductor, transformer primary side, resonant capacitor and switch Q3 form a path.

[0093] Specific limitations regarding the circuit startup device can be found in the limitations of the circuit startup method described above, and will not be repeated here. Each module in the aforementioned circuit startup device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the electronic device in hardware form or independently of it, or stored in the memory of the electronic device in software form, so that the processor can call and execute the corresponding operations of each module.

[0094] In one embodiment, this application also provides a transformer circuit. For example... Figure 1b As shown, the transformer circuit includes a full-bridge circuit and a resonant circuit connected to the full-bridge circuit. The input signals of the switching transistors in the full-bridge circuit are drive signals PWM1, PWM2, PWM3, and PWM4, respectively. Among them, the phases of drive signals PWM1 and PWM4 are complementary, and the phases of drive signals PWM2 and PWM3 are complementary. The phases of the drive signals of the two switching transistors in the full-bridge circuit are adjusted so that drive signals PWM1 and PWM4 are in phase, and drive signals PWM2 and PWM3 are in phase, so as to start the resonant circuit.

[0095] In this embodiment of the application, the input signal of switch Q1 in the full-bridge circuit is drive signal PWM1, the input signal of switch Q2 is drive signal PWM2, the input signal of switch Q3 is drive signal PWM3, and the input signal of switch Q4 is drive signal PWM4. Figure 3 As shown, the phases of drive signals PWM1 and PWM4 are complementary, and the phases of drive signals PWM2 and PWM3 are complementary.

[0096] Subsequently, the phase of the drive signals for the two switches in the full-bridge circuit is adjusted. For example, the full-bridge circuit includes switches Q1, Q2, Q3, and Q4, and the resonant circuit includes a resonant inductor, the primary winding of a transformer, and a resonant capacitor. When switches Q1 and Q4 are simultaneously turned on, switches Q1, the resonant capacitor, the primary winding of the transformer, the resonant inductor, and switches Q4 form a closed circuit. When switches Q2 and Q3 are simultaneously turned on, switches Q2, the resonant inductor, the primary winding of the transformer, the resonant capacitor, and switches Q3 form a closed circuit.

[0097] As the phase is gradually adjusted, the duration for which the two switching transistors are simultaneously turned on gradually increases, and the energy input to the resonant circuit also gradually increases. When the driving signals PWM1 and PWM4 are in phase, and the driving signals PWM2 and PWM3 are in phase, the phase adjustment ends, and the resonant circuit starts.

[0098] In the above embodiments, the transformer circuit includes a full-bridge circuit and a resonant circuit. The input signals of the switching transistors in the full-bridge circuit are drive signals PWM1, PWM2, PWM3, and PWM4, respectively. The phases of the drive signals of the two switching transistors in the full-bridge circuit are adjusted so that drive signals PWM1 and PWM4 are in phase, and drive signals PWM2 and PWM3 are in phase, thereby activating the resonant circuit. This embodiment of the application gradually increases the conduction time of each pair of transistors in the full-bridge circuit by adjusting the phases of the drive signals of the two switching transistors in the full-bridge circuit, thereby gradually increasing the energy input to the resonant circuit. Therefore, it can avoid voltage or current impacts on the devices in the resonant circuit, thus better protecting the devices in the resonant circuit.

[0099] In one embodiment, an electronic device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 9As shown. The computer device includes a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a circuit-starting method. The display screen can be an LCD screen or an e-ink display screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device casing, or an external keyboard, touchpad, or mouse.

[0100] Those skilled in the art will understand that Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0101] In one embodiment, an electronic device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0102] The driving signals PWM1, PWM2, PWM3 and PWM4 are respectively input to the switching transistors in the full-bridge circuit; wherein the phases of driving signals PWM1 and PWM4 are complementary, and the phases of driving signals PWM2 and PWM3 are complementary.

[0103] Adjust the phase of the drive signals of the two switching transistors in the full-bridge circuit so that drive signal PWM1 and drive signal PWM4 are in phase, and drive signal PWM2 and drive signal PWM3 are in phase, so as to start the resonant circuit.

[0104] In one embodiment, the processor performs the following steps when executing a computer program:

[0105] The phases of drive signals PWM4 and PWM2 are adjusted according to the preset first phase step size, so that drive signals PWM1 and PWM4 are in the same phase, and drive signals PWM2 and PWM3 are in the same phase.

[0106] In one embodiment, the processor performs the following steps when executing a computer program:

[0107] The phases of the drive signal PWM4 and the drive signal PWM2 are adjusted according to the first phase step size and the preset first frequency step size, respectively.

[0108] In one embodiment, the processor performs the following steps when executing a computer program:

[0109] The phases of drive signals PWM1 and PWM3 are adjusted according to the preset second phase step size, so that drive signals PWM1 and PWM4 are in the same phase, and drive signals PWM2 and PWM3 are in the same phase.

[0110] In one embodiment, the processor performs the following steps when executing a computer program:

[0111] The phases of drive signals PWM1 and PWM3 are adjusted according to the second phase step size and the preset second frequency step size.

[0112] In one embodiment, the processor performs the following steps when executing a computer program:

[0113] After the resonant circuit is started, the frequencies of drive signals PWM1, PWM2, PWM3 and PWM4 are reduced respectively.

[0114] In one embodiment, the processor performs the following steps when executing a computer program:

[0115] The frequencies of drive signals PWM1, PWM2, PWM3, and PWM4 are reduced respectively according to the preset third frequency step.

[0116] In one embodiment, the processor performs the following steps when executing a computer program:

[0117] Adjust the phase of drive signal PWM1 or drive signal PWM4 to control switch Q1 and switch Q4 to be turned on simultaneously, so that switch Q1, resonant capacitor, transformer primary side, resonant inductor and switch Q4 form a circuit;

[0118] Adjust the phase of drive signal PWM2 or drive signal PWM3 to control switch Q2 and switch Q3 to conduct simultaneously, so that switch Q2, resonant inductor, transformer primary side, resonant capacitor and switch Q3 form a circuit.

[0119] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0120] The driving signals PWM1, PWM2, PWM3 and PWM4 are respectively input to the switching transistors in the full-bridge circuit; wherein the phases of driving signals PWM1 and PWM4 are complementary, and the phases of driving signals PWM2 and PWM3 are complementary.

[0121] Adjust the phase of the drive signals of the two switching transistors in the full-bridge circuit so that drive signal PWM1 and drive signal PWM4 are in phase, and drive signal PWM2 and drive signal PWM3 are in phase, so as to start the resonant circuit.

[0122] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0123] The phases of drive signals PWM4 and PWM2 are adjusted according to the preset first phase step size, so that drive signals PWM1 and PWM4 are in the same phase, and drive signals PWM2 and PWM3 are in the same phase.

[0124] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0125] The phases of the drive signal PWM4 and the drive signal PWM2 are adjusted according to the first phase step size and the preset first frequency step size, respectively.

[0126] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0127] The phases of drive signals PWM1 and PWM3 are adjusted according to the preset second phase step size, so that drive signals PWM1 and PWM4 are in the same phase, and drive signals PWM2 and PWM3 are in the same phase.

[0128] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0129] The phases of drive signals PWM1 and PWM3 are adjusted according to the second phase step size and the preset second frequency step size.

[0130] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0131] After the resonant circuit is started, the frequencies of drive signals PWM1, PWM2, PWM3 and PWM4 are reduced respectively.

[0132] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0133] The frequencies of drive signals PWM1, PWM2, PWM3, and PWM4 are reduced respectively according to the preset third frequency step.

[0134] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0135] Adjust the phase of drive signal PWM1 or drive signal PWM4 to control switch Q1 and switch Q4 to be turned on simultaneously, so that switch Q1, resonant capacitor, transformer primary side, resonant inductor and switch Q4 form a circuit;

[0136] Adjust the phase of drive signal PWM2 or drive signal PWM3 to control switch Q2 and switch Q3 to conduct simultaneously, so that switch Q2, resonant inductor, transformer primary side, resonant capacitor and switch Q3 form a circuit.

[0137] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0138] The driving signals PWM1, PWM2, PWM3 and PWM4 are respectively input to the switching transistors in the full-bridge circuit; wherein the phases of driving signals PWM1 and PWM4 are complementary, and the phases of driving signals PWM2 and PWM3 are complementary.

[0139] Adjust the phase of the drive signals of the two switching transistors in the full-bridge circuit so that drive signal PWM1 and drive signal PWM4 are in phase, and drive signal PWM2 and drive signal PWM3 are in phase, so as to start the resonant circuit.

[0140] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0141] The phases of drive signals PWM4 and PWM2 are adjusted according to the preset first phase step size, so that drive signals PWM1 and PWM4 are in the same phase, and drive signals PWM2 and PWM3 are in the same phase.

[0142] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0143] The phases of the drive signal PWM4 and the drive signal PWM2 are adjusted according to the first phase step size and the preset first frequency step size, respectively.

[0144] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0145] The phases of drive signals PWM1 and PWM3 are adjusted according to the preset second phase step size, so that drive signals PWM1 and PWM4 are in the same phase, and drive signals PWM2 and PWM3 are in the same phase.

[0146] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0147] The phases of drive signals PWM1 and PWM3 are adjusted according to the second phase step size and the preset second frequency step size.

[0148] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0149] After the resonant circuit is started, the frequencies of drive signals PWM1, PWM2, PWM3 and PWM4 are reduced respectively.

[0150] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0151] The frequencies of drive signals PWM1, PWM2, PWM3, and PWM4 are reduced respectively according to the preset third frequency step.

[0152] In one embodiment, when the computer program is executed by a processor, it performs the following steps:

[0153] Adjust the phase of drive signal PWM1 or drive signal PWM4 to control switch Q1 and switch Q4 to be turned on simultaneously, so that switch Q1, resonant capacitor, transformer primary side, resonant inductor and switch Q4 form a circuit;

[0154] Adjust the phase of drive signal PWM2 or drive signal PWM3 to control switch Q2 and switch Q3 to conduct simultaneously, so that switch Q2, resonant inductor, transformer primary side, resonant capacitor and switch Q3 form a circuit.

[0155] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0156] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0157] The above-described embodiments are merely illustrative of several implementation methods of the embodiments of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the embodiments of this application, and these all fall within the protection scope of the embodiments of this application. Therefore, the protection scope of the patent for the embodiments of this application should be determined by the appended claims.

Claims

1. A circuit startup method, characterized in that, Applied to a transformer circuit, the transformer circuit including a full-bridge circuit and a resonant circuit connected to the full-bridge circuit, the method includes: Drive signals PWM1, PWM2, PWM3, and PWM4 are respectively input to the switching transistors in the full-bridge circuit; wherein, the phases of drive signals PWM1 and PWM4 are complementary, and the phases of drive signals PWM2 and PWM3 are complementary. The phases of the drive signals of the two switching transistors in the full-bridge circuit are adjusted so that the drive signal PWM1 is in phase with the drive signal PWM4, and the drive signal PWM2 is in phase with the drive signal PWM3, so as to start the resonant circuit.

2. The method according to claim 1, characterized in that, The method includes: The phases of the driving signals PWM4 and PWM2 are adjusted according to a preset first phase step size, so that the driving signals PWM1 and PWM4 are in the same phase, and the driving signals PWM2 and PWM3 are in the same phase.

3. The method according to claim 2, characterized in that, The method includes: The phases of the driving signal PWM4 and the driving signal PWM2 are adjusted according to the first phase step size and the preset first frequency step size, respectively.

4. The method according to claim 1, characterized in that, The method includes: The phases of the driving signals PWM1 and PWM3 are adjusted according to the preset second phase step size, so that the driving signals PWM1 and PWM4 are in the same phase, and the driving signals PWM2 and PWM3 are in the same phase.

5. The method according to claim 4, characterized in that, The method includes: The phases of the drive signals PWM1 and PWM3 are adjusted according to the second phase step size and the preset second frequency step size.

6. The method according to any one of claims 1-5, characterized in that, The method includes: After the resonant circuit is started, the frequencies of the drive signals PWM1, PWM2, PWM3 and PWM4 are reduced respectively.

7. The method according to claim 6, characterized in that, The method includes: The frequencies of the drive signals PWM1, PWM2, PWM3, and PWM4 are reduced respectively according to a preset third frequency step.

8. The method according to claim 1, characterized in that, The full-bridge circuit includes switching transistors Q1, Q2, Q3, and Q4. The resonant circuit includes a resonant inductor, the primary winding of a transformer, and a resonant capacitor. Adjusting the phase of the drive signals for the two switching transistors in the full-bridge circuit includes: Adjust the phase of the drive signal PWM1 or the phase of the drive signal PWM4 to control the switching transistors Q1 and Q4 to be turned on simultaneously, so that the switching transistor Q1, the resonant capacitor, the primary side of the transformer, the resonant inductor and the switching transistor Q4 form a circuit; Adjust the phase of the drive signal PWM2 or the phase of the drive signal PWM3 to control the switching transistors Q2 and Q3 to be turned on simultaneously, so that the switching transistor Q2, the resonant inductor, the primary side of the transformer, the resonant capacitor and the switching transistor Q3 form a circuit.

9. A transformer circuit, characterized in that, The transformer circuit includes a full-bridge circuit and a resonant circuit connected to the full-bridge circuit. The input signals of the switching transistors in the full-bridge circuit are drive signals PWM1, PWM2, PWM3 and PWM4, respectively; wherein, the phases of drive signals PWM1 and PWM4 are complementary, and the phases of drive signals PWM2 and PWM3 are complementary. The phases of the drive signals for the two switching transistors in the full-bridge circuit are adjusted so that the drive signal PWM1 is in phase with the drive signal PWM4, and the drive signal PWM2 is in phase with the drive signal PWM3, in order to start the resonant circuit.

10. The transformer circuit according to claim 9, characterized in that, The full-bridge circuit includes switching transistors Q1, Q2, Q3, and Q4, and the resonant circuit includes a resonant inductor, the primary winding of a transformer, and a resonant capacitor. When the switching transistors Q1 and Q4 are simultaneously turned on, the switching transistor Q1, the resonant capacitor, the primary side of the transformer, the resonant inductor, and the switching transistor Q4 form a circuit. When both switch Q2 and switch Q3 are turned on, switch Q2, resonant inductor, primary winding of transformer, resonant capacitor and switch Q3 form a circuit.

11. A circuit starting device, characterized in that, The device is applied to a transformer circuit, the transformer circuit including a full-bridge circuit and a resonant circuit connected to the full-bridge circuit, and includes: The signal input module is used to input drive signals PWM1, PWM2, PWM3 and PWM4 to the switching transistors in the full-bridge circuit respectively; wherein the phases of drive signals PWM1 and PWM4 are complementary, and the phases of drive signals PWM2 and PWM3 are complementary. The phase adjustment module is used to adjust the phase of the drive signals of the two switching transistors in the full-bridge circuit so that the drive signal PWM1 and the drive signal PWM4 are in the same phase, and the drive signal PWM2 and the drive signal PWM3 are in the same phase, so as to start the resonant circuit.

12. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 8.

13. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 8.

14. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1-8.

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