Power factor correction method, device, power factor correction module and power supply module

Abstract

The application discloses a power factor correction method and device, a power factor correction module and a power supply module, and relates to the technical field of power electronics control. The method comprises the following steps: determining the working area of three phases according to the phase angle of a power grid; when two phases are in a normal area and the remaining one phase is in a clamping area, the phase corresponding to the clamping area stops generating waves, and only the two phases in the normal area participate in wave generation; when two phases are in a transition area and the remaining one phase is in a normal area, all the three phases participate in wave generation; the reference current of the two phases in the transition area is corrected according to the area change trend; and then the reference current of all the phases participating in wave generation is used to generate a corresponding switch conduction time sequence control signal, so that power factor correction in a discontinuous conduction mode is realized. The application does not need to configure current sampling and zero-crossing detection circuits for each phase, effectively reduces the hardware cost, and simultaneously realizes smooth switching of the transition area control strategy by dynamically adjusting the reference current participating in wave generation in the transition area, so that current distortion is effectively inhibited.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, specifically to a power factor correction method, device, power factor correction module, and power supply module. Background Technology

[0002] Power factor correction (PFC) modules adjust the AC input current waveform to match the grid voltage waveform, thereby achieving power factor correction and effectively improving power utilization efficiency. They have been widely used in various power conversion devices.

[0003] Discontinuous Conduction Mode (DCM) is one of the mainstream operating modes of power factor correction modules. It utilizes current sensors to collect the actual current of each phase's inductor and a zero-crossing detection circuit to capture the zero-crossing moment of the inductor current within each switching cycle. Based on the difference between the actual current and the reference current of each phase, it adjusts the switching sequence of each phase in a closed loop. Because this control method is highly dependent on current sensors and zero-crossing detection circuits, the hardware cost is relatively high. Summary of the Invention

[0004] In view of this, this application provides a power factor correction method, device, power factor correction module and power supply module, which can reduce hardware costs while achieving smooth switching of transition zone control strategies through regional state judgment and multi-phase collaborative scheduling.

[0005] To solve the above problems, the technical solution provided in this application is as follows:

[0006] In a first aspect, this application provides a power factor correction control method, comprising:

[0007] Obtain the power grid phase angle;

[0008] Based on the grid phase angle, the working areas of the three phases are determined respectively. The working areas are divided according to the grid cycle into: a normal zone, a clamping zone, and a transition zone between the normal zone and the clamping zone. When two phases are in the normal zone and the remaining phase is in the clamping zone, both phases in the normal zone participate in wave generation, while the phase in the clamping zone does not participate in wave generation. When two phases are in the transition zone and the remaining phase is in the normal zone, all three phases participate in wave generation.

[0009] When two phases are in the transition region and the remaining phase is in the normal region, the reference currents of the two phases in the transition region are corrected according to the changing trend of the working area, while keeping the reference current of the phase in the normal region unchanged.

[0010] Based on the reference current of the phase involved in the wave generation, output the switching timing control signal of the phase involved in the wave generation.

[0011] In one possible implementation, the correction of the reference currents of the two phases in the transition region according to the changing trend of the working region includes:

[0012] Based on the changing trend of the working area, the correction coefficients of the two phases in the transition zone are determined, wherein the changing trend of the working area includes: a first changing trend that will lead from the transition zone to the normal zone, and a second changing trend that will lead from the transition zone to the clamping zone; the correction coefficient of the wave-generating phase in the first changing trend is greater than the correction coefficient of the wave-generating phase in the second changing trend.

[0013] The reference current corresponding to the wave-generating phase is corrected according to the correction factor.

[0014] In one possible implementation, outputting the switching timing control signal of the participating phase based on the reference current of the participating phase includes:

[0015] The on-time of the corresponding switch is determined based on the reference current of the phase involved in the wave generation.

[0016] The peak current of the inductor in the participating phase is obtained by fitting the ratio coefficient of the peak current of the inductor in the participating phase to the reference current based on the conduction delay.

[0017] Based on the peak current of the inductor participating in the wave generation phase, determine the on-time and off-time of the corresponding switch;

[0018] Output the switching on timing control signal of the phase participating in the wave generation, the switching on timing control signal including: the on time, the off time and the on delay.

[0019] In one possible implementation, determining the turn-on delay of the corresponding switch based on the reference current of the participating wave-generating phase includes:

[0020] Obtain the mapping table between reference current and conduction delay, where the reference current and conduction delay are negatively correlated;

[0021] The on-time of the corresponding switch is obtained by querying the mapping table based on the reference current of the phase involved in the wave generation.

[0022] In one possible implementation, determining the on-time and off-time of the corresponding switch based on the peak inductor current of the participating wave-generating phase includes:

[0023] The peak current of the inductor participating in the wave generation phase is input into a preset switch turn-on timing function to obtain the turn-on time and turn-off time of the corresponding switch.

[0024] In one possible implementation, determining the operating regions of the three phases based on the grid phase angle includes:

[0025] Based on the pre-defined power grid phase angle range corresponding to the three different working areas of the three phases, the working areas of the three phases are determined respectively;

[0026] When two phases are in the normal region and the remaining phase is in the clamping region, the control area state machine will set the coordination flag to an invalid state;

[0027] When two phases are in the transition region and the remaining phase is in the normal region, the control region state machine sets the coordination flag to an active state.

[0028] In one possible implementation, the power factor correction control method further includes:

[0029] When the coordination flag is invalid, the total reference current is transformed by coordinate transformation to obtain the single-phase reference current of the three phases.

[0030] A second aspect of this application provides a power factor correction control device, comprising:

[0031] Phase-locked unit (PLU) is used to obtain the phase angle of the power grid;

[0032] The region determination unit is used to determine the working regions of the three phases according to the power grid phase angle. The working regions are divided into a normal region, a clamping region, and a transition region between the normal region and the clamping region according to the power grid cycle. When two phases are in the normal region and the remaining phase is in the clamping region, the two phases in the normal region participate in wave generation, and the phase in the clamping region does not participate in wave generation. When two phases are in the transition region and the remaining phase is in the normal region, all three phases participate in wave generation.

[0033] The coordinated scheduling unit is used to correct the reference current of the two phases in the transition zone according to the working area change trend when two phases are in the transition zone and the remaining phase is in the normal zone, so as to keep the reference current of the phase in the normal zone unchanged.

[0034] The timing generation unit is used to output the switching on timing control signal of the participating phase based on the reference current of the participating phase.

[0035] The phase-locked unit, the region determination unit, the cooperative scheduling unit, and the timing generation unit interact through a standard interface.

[0036] A third aspect of this application provides a power factor correction module, including a power main circuit and a controller;

[0037] The main power circuit includes: a voltage sampling circuit and a three-phase six-switch topology circuit;

[0038] The output of the voltage sampling circuit is connected to the analog sampling input of the controller, and is used to send the grid voltage sampling signal to the controller.

[0039] The controller determines the grid phase angle based on the grid voltage sampling signal, and determines the working area of ​​each of the three phases based on the grid phase angle. The working area is divided according to the grid cycle into a normal zone, a clamping zone, and a transition zone between the normal zone and the clamping zone. When two phases are in the normal zone and the remaining phase is in the clamping zone, both phases in the normal zone participate in wave generation, while the phase in the clamping zone does not participate. When two phases are in the transition zone and the remaining phase is in the normal zone, all three phases participate in wave generation. When two phases are in the transition zone and the remaining phase is in the normal zone, the reference current of the two phases in the transition zone is corrected according to the working area change trend, while keeping the reference current of the phase in the normal zone unchanged. Based on the reference current of the phase participating in wave generation, the controller outputs the switching timing control signal for the phase participating in wave generation.

[0040] The switch conduction timing control signal drives the corresponding power switch in the three-phase six-switch topology circuit to turn on and off.

[0041] A fourth aspect of this application provides a power module, including: a DC-DC converter module and the power factor correction module described in the third aspect above;

[0042] The input terminal of the DC-DC converter module is connected to the DC output side of the power factor correction module.

[0043] This application provides a power factor correction method that divides the power grid cycle into a normal zone, a clamping zone, and a transition zone between the normal zone and the clamping zone. By acquiring the power grid phase angle, the operating regions of the three phases are determined. When two phases are in the normal zone and the remaining phase is in the clamping zone, the corresponding phase in the clamping zone stops generating waveforms, and only the two phases in the normal zone participate in waveform generation. By limiting the number of phases participating in waveform generation according to different operating conditions, the switching losses of unnecessary phases are reduced. When two phases are in the transition zone and the remaining phase is in the normal zone, all three phases participate in waveform generation. The reference currents of the two phases in the transition zone are differentially corrected according to the regional change trend. Then, the corresponding switch conduction sequence control signals are generated based on the reference currents of all phases participating in waveform generation, realizing three-phase power factor correction in DCM discontinuous conduction mode. This differential correction mechanism can smooth the switching process between different operating regions, reduce the current distortion caused by the switching of operating conditions, and improve the system's operational stability. At the same time, this application does not require configuring current sampling and zero-crossing detection circuits for each phase, effectively reducing the hardware cost of the power factor correction module and simplifying the hardware architecture. Attached Figure Description

[0044] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0045] Figure 1 A schematic diagram of a power factor correction module provided in an embodiment of this application;

[0046] Figure 2 A schematic flowchart of a power factor correction control method provided in an embodiment of this application;

[0047] Figure 3 A schematic diagram illustrating the relationship between three-phase line voltage and grid phase angle is provided for an embodiment of this application.

[0048] Figure 4 This is a schematic diagram of the switch conduction timing provided in an embodiment of this application;

[0049] Figure 5 This is a schematic diagram of the power factor correction process provided in the embodiments of this application;

[0050] Figure 6 A schematic diagram of a power factor correction module provided in an embodiment of this application;

[0051] Figure 7 This is a schematic diagram of a power module provided in an embodiment of this application. Detailed Implementation

[0052] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.

[0053] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0054] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0055] This application provides a power factor correction control method, applied to the controller in a power factor correction module. Please refer to [link to relevant documentation]. Figure 1 The power factor correction module 10 shown includes a power main circuit 11 and a controller 12.

[0056] The controller 12 can be a control chip such as MCU (Microcontroller Unit), DSP (Digital Signal Processor), or FPGA (Field Programmable Gate Array).

[0057] The main power circuit 11 includes a voltage sampling circuit and a three-phase six-switch topology circuit. The output of the voltage sampling circuit is connected to the analog sampling input of the controller 12, and is used to send the grid voltage sampling signal to the controller 12 so that the controller 12 can determine the grid phase angle based on the grid voltage sampling signal. The three-phase six-switch topology circuit includes a three-phase input inductor, three sets of upper and lower bridge arms for a total of six power switches, and a DC bus. The three-phase AC is connected to the corresponding bridge arm through the inductor, and the output of the bridge arm is connected in parallel to the DC bus.

[0058] The controller 12 executes any of the power factor correction methods provided in the embodiments of this application, outputs the switching timing control signal of the participating phase, drives the switching of the corresponding power switch in the three-phase six-switch topology circuit to achieve power factor correction in the intermittent conduction mode.

[0059] Reference Figure 2 , Figure 2 This is a flowchart illustrating a power factor correction control method provided in an embodiment of this application, as shown below. Figure 2 As shown in the figure, the power factor correction control method provided in this application embodiment may include steps 201 to 204, which are described in detail below.

[0060] 201: Obtain the power grid phase angle.

[0061] The grid phase angle is a parameter that characterizes the instantaneous phase position of the three-phase grid voltage. The grid phase angle ranges from 0 to 360 degrees and changes cyclically.

[0062] After the controller 12 acquires the grid voltage sampling signal sent by the voltage sampling circuit, it inputs the three-phase line voltage in the grid voltage sampling signal into the phase-locked loop (PLL) for phase-locked operation to obtain the grid phase angle.

[0063] The grid phase angle reflects the instantaneous state of the current three-phase line voltages of the grid. Please refer to [link / reference]. Figure 3 The diagram showing the relationship between three-phase line voltage and grid phase angle illustrates that when phase A voltage is near its peak value in the positive half-cycle, the corresponding grid phase angle is approximately 0 degrees; when phase A voltage crosses zero, the corresponding grid phase angle is approximately 90 degrees or 270 degrees. By acquiring the grid phase angle in real time, the specific position of each phase voltage within the sine wave cycle can be accurately determined, thus providing accurate input data for the division of the working area.

[0064] 202: Determine the working area of ​​each of the three phases based on the power grid phase angle.

[0065] The power grid cycle is divided into a normal zone, a clamping zone, and a transition zone between the normal zone and the clamping zone. The normal zone corresponds to a period with relatively high and stable phase voltage amplitude; the clamping zone corresponds to a period near the voltage peak value, during which the corresponding phase does not participate in wave generation; the transition zone is a buffer zone between the normal zone and the clamping zone. The transition zone can be defined as the power grid phase angle boundary corresponding to the normal zone or the clamping zone ± a preset degree. The preset degree is pre-configured and can dynamically change according to operating conditions. Please refer to [link to relevant documentation]. Figure 3 Taking the grid phase angle range corresponding to the clamping zone of phase A as [-30°, 30°] and [150°, 210°] as an example, the transition zone of this phase is [-60°, -30°], [30°, 60°], [120°, 150°], [210°, 240°].

[0066] The three-phase voltages are 120° out of phase with each other, therefore the operating regions of the three phases are divided differently. Due to the inherent phase misalignment constraint of the three-phase sinusoidal waveform, only two types of zone combinations can occur throughout the entire cycle: two phases in the normal region and the remaining phase in the clamping region; or two phases in the transition region and the remaining phase in the normal region. Please refer to [link / reference]. Figure 3 The diagram showing the relationship between the three-phase line voltage and the grid phase angle indicates that when phase A is in the first transition zone, phase B is also in the transition zone, and phase C is in the normal zone; when phase A is in the first clamping zone, phases B and C are in the normal zone.

[0067] The power grid phase angle range corresponding to the normal zone, transition zone and clamping zone of each phase is preset in advance. Based on the correspondence between the power grid phase angle and the working area of ​​each phase, the working area of ​​the three phases can be determined.

[0068] Phases in the normal and transition regions participate in waveform generation, and their corresponding power switches perform normal PWM modulation according to their respective reference currents. Phases in the clamping region do not participate in waveform generation; that is, the switches in these phases remain in a fixed on or off state. Specifically, during the first half of the voltage cycle, the lower switch is always on and the upper switch is always off; during the second half of the voltage cycle, the upper switch is always on and the lower switch is always off. For example, at a certain moment, phases A and B are in the normal region, while phase C is in the clamping region. In this case, only phases A and B participate in waveform generation, while phase C is clamped.

[0069] 203: When two phases are in the transition region and the remaining phase is in the normal region, the reference currents of the two phases in the transition region are corrected according to the changing trend of the working region, while keeping the reference current of the phase in the normal region unchanged.

[0070] The single-phase reference current for three-phase systems is obtained by coordinate transformation of the total reference current, corresponding to the desired current value for independent control of each phase. Please refer to [link / reference]. Figure 5 The power factor correction flowchart shown depicts the total reference current Iq_ref, which is the desired total input current generated by the control target (such as the bus voltage loop output), used to characterize the total energy required at the current moment. Using inverse Park and inverse Clarke transforms, the total reference current is mapped to three independent components in a three-phase stationary coordinate system: phase A reference current Ia_ref, phase B reference current Ib_ref, and phase C reference current Ic_ref.

[0071] The continuous change in the power grid phase angle drives the switching of each phase between the normal region, transition region, and clamping region. The transition region, serving as a buffer between the normal and clamping regions, is where the voltage amplitude and output power capacity of each phase are dynamically changing. If the unadjusted original reference current is used directly to allocate power, sudden changes in output power between adjacent phases and power imbalances between phases will occur, leading to input current distortion and system oscillations. Therefore, it is necessary to adjust the reference current based on the switching trend of each phase's operating region, dynamically adjust the power allocation ratio of the two transition phases, and smooth the power step change at the moment of operating region switching.

[0072] The operating region variation trend is divided into two categories: one is the first variation trend from the transition region to the normal region, and the other is the second variation trend from the transition region to the clamping region. Specifically, the correction coefficients for the two phases in the transition region can be determined based on the operating region variation trend, and the reference current can be corrected accordingly.

[0073] 204: Based on the reference current of the phase participating in the wave generation, output the switching timing control signal of the phase participating in the wave generation.

[0074] The switch-on timing control signal is a pulse signal used to drive the power switch transistor to turn on and off. Please refer to [link / reference]. Figure 4 The diagram shows the switching timing sequence. The specific control signals for the switching timing sequence include on-time (Ton), off-time (Toff), and on-delay (Tdelay). On-time refers to the duration the power switching device remains in the on state within one switching cycle; its function is to control the rising slope and peak value of the inductor current. Off-time refers to the time required for the inductor current to drop to zero after the power switching device is turned off; its function is to ensure that the inductor energy is fully released to maintain discontinuous conduction mode (DCM). On-delay refers to the waiting time between the end of one switching cycle and the beginning of the next cycle; its function is to adjust the switching frequency and optimize dead-time control, preventing bridge arm shoot-through.

[0075] Based on the reference current of the phase involved in the wave generation, the on-time (Ton), off-time (Toff), and on-delay (Tdelay) of the phase involved in the wave generation are determined through a preset mapping relationship. The phase involved in the wave generation includes the phase in the transition region and the phase in the normal region. The above mapping relationship can be stored in a lookup table or calculated in real time through a preset switching timing function.

[0076] The switch-on timing control signal is sent to the three-phase six-switch topology circuit to achieve precise control of the phases involved in the power generation, which is then applied to the power conversion stage to achieve power factor correction.

[0077] By converting the switch turn-on timing into actual switch drive signals, closed-loop control from feedforward current command to final power conversion is achieved.

[0078] This embodiment provides a power factor correction control method that divides the power grid cycle into a normal zone, a clamping zone, and a transition zone between the normal zone and the clamping zone. By acquiring the power grid phase angle, the operating regions of the three phases are determined. When two phases are in the normal zone and the remaining phase is in the clamping zone, the corresponding phase in the clamping zone stops transmitting waves, and only the two phases in the normal zone participate in transmitting waves. By limiting the number of phases participating in transmitting waves according to different operating conditions, the switching losses of unnecessary phases are reduced. When two phases are in the transition zone and the remaining phase is in the normal zone, all three phases participate in transmitting waves. The reference current of the two phases in the transition zone is differentially corrected according to the regional change trend. Then, the corresponding switch conduction sequence control signal is generated based on the reference current of all phases participating in transmitting waves, realizing three-phase power factor correction in DCM discontinuous conduction mode. This differential correction mechanism can smooth the switching process between different operating regions, reduce the current distortion caused by the switching of operating conditions, and improve the system's operational stability. At the same time, this application does not require the configuration of current sampling and zero-crossing detection circuits for each phase, effectively reducing the hardware cost of the power factor correction module and simplifying the hardware architecture.

[0079] In one possible implementation, step 202 in the above embodiments includes the following steps 2021-2023:

[0080] 2021: Determine the working area of ​​the three phases based on the pre-set grid phase angle range corresponding to the different working areas of the three phases.

[0081] The working area is determined by comparing the real-time acquired grid phase angle with a pre-defined range of grid phase angles corresponding to different three-phase working areas. For example, please refer to... Figure 3 The clamping zone of phase A includes [-30°, 30°] and [150°, 210°], the transition zone includes [-60°, -30°], [30°, 60°], [120°, 150°], and [210°, 240°], and the normal zone includes [60°, 120°] and [240°, 300°]. Therefore, when the phase angle of phase A is detected to be 50°, it is determined to be in the transition zone; when the phase angle is 0°, it is determined to be in the clamping zone; and when the phase angle is 100°, it is determined to be in the normal zone.

[0082] 2022: When two phases are in the normal zone and the remaining phase is in the clamping zone, the control area state machine sets the coordination flag to an invalid state.

[0083] Within the control system operating the controller, a regional state machine is maintained. When the grid phase angle enters different operating zones, the state of the regional state machine transitions. The state of the regional state machine is represented by a coordination flag, which can be a Boolean-type status signal output by the regional state machine, indicating whether multi-phase coordinated scheduling logic needs to be activated. An invalid state indicates that two phases are in the normal zone and the remaining phase is in the clamping zone. Each phase operates independently. Phases in the normal zone employ independent control strategies, and the reference current does not require correction; the switch conduction timing control signal is directly output based on the reference current. Phases in the clamping zone employ clamping and limiting strategies and do not participate in wave generation.

[0084] The setting of the coordination flag is based on the determined three-phase operating region combination: the region state machine performs a set operation, clearing the coordination flag to zero or setting it to logic 0 (i.e., invalid), only when two phases are in the normal region and the remaining phase is in the clamping region. For example, when the grid phase angle has not entered the commutation or operating region switching critical point, two phases are in the normal region and the remaining phase is in the clamping region, and the region state machine sets the coordination flag to invalid. At this time, the phase in the normal region uses a single-phase independent control strategy, which does not require coordinated correction of the reference current, thereby reducing computational complexity and improving response speed.

[0085] 2023: When two phases are in the transition zone and the remaining phase is in the normal zone, the control area state machine sets the coordination flag to the valid state.

[0086] The coordination flag being set to valid indicates that the operating condition switching phase has been entered, requiring activation of multi-phase coordinated scheduling. Specifically, when any two phases are detected to be in the transition zone and the remaining phase is in the normal zone, the state transition of the region state machine is immediately triggered, setting the coordination flag to logic 1 (i.e., valid).

[0087] When the coordination flag is set to the active state, the multi-phase coordination control strategy is enabled. The reference current of the two phases in the transition zone is corrected according to the changing trend of the working area. The power distribution ratio between the two transition phases is dynamically adjusted by using the differential correction coefficient, so as to smooth the cross-region switching process of each phase and suppress the input current distortion caused by the switching of operating conditions.

[0088] In this embodiment, when two phases are in the normal region and the remaining phase is in the clamping region, the region state machine sets the coordination flag to invalid and enables a single-phase independent control strategy. When two phases are in the transition region and the remaining phase is in the normal region, the region state machine sets the coordination flag to valid and enables a multi-phase coordinated control strategy. Based on the state management mechanism of the region state machine described above, the coordination flag is used to achieve seamless switching of control strategies, effectively solving the current distortion problem caused by three-phase voltage commutation or control mode switching in the transition region, and improving system stability.

[0089] Based on the above embodiments, when the coordination flag is invalid, it indicates that two phases are in the normal region and the remaining phase is in the clamping region. The two phases in the normal region enable the single-phase independent control strategy, and the coordinate transformation of the total reference current is performed to obtain the single-phase reference current of the three phases. The phase in the clamping region does not participate in wave generation.

[0090] The single-phase reference current for each of the three phases is obtained by coordinate transformation of the total reference current, corresponding to the desired current value for independent control of each phase. For details, please refer to [link to relevant documentation]. Figure 5 The power factor correction (PFC) flowchart shown below illustrates the process. The total reference current Iq_ref generated by the voltage loop is obtained. Combined with the grid phase angle obtained by the phase-locked loop (PLL), the total reference current is mapped to three independent components in a three-phase stationary coordinate system using inverse Park and inverse Clarke transformations: phase A reference current Ia_ref, phase B reference current Ib_ref, and phase C reference current Ic_ref. This coordinate transformation method accurately decomposes the overall power demand of the system into independent execution targets for each phase. By directly determining the single-phase reference currents of the three phases as the target currents, the control loops of each phase are decoupled under normal operating conditions. The drive logic of each corresponding power switch depends only on the original reference current value of its own phase and is no longer affected by the states of other phases. This significantly reduces the computational burden on the controller, avoids initiating complex multi-phase coordinated control strategies under unnecessary operating conditions, and ensures the sinusoidal and symmetrical nature of the current waveforms of each phase in the stable operating region.

[0091] In one possible implementation, when the coordination flag is active, it indicates that two phases are in the transition region and the remaining phase is in the normal region. Specifically, the reference currents of the two phases in the transition region are corrected according to the changing trend of the operating region, including the following steps 2031-2032:

[0092] 2031: Determine the correction coefficients for the two phases in the transition zone based on the changing trend of the working area.

[0093] The changing trends of the working area include: a first changing trend of moving from the transition zone to the normal zone, and a second changing trend of moving from the transition zone to the clamping zone.

[0094] In this embodiment, the correction coefficient for the phase participating in the wave generation under the first trend is set to be greater than that for the phase participating in the wave generation under the second trend. For example, the correction coefficient for the phase participating in the wave generation under the first trend is greater than 1, while the correction coefficient for the phase participating in the wave generation under the second trend is less than 1. The phase under the first trend is about to enter the normal region where the voltage amplitude is stable and full power output is possible from the transition region. The power carrying capacity of this phase gradually increases. By assigning it a correction coefficient greater than 1, the reference current of this phase is moderately increased, allowing it to gradually take on more output power. On the other hand, the phase under the second trend is about to enter the clamping region where modulation is restricted and power output is stopped from the transition region. The power carrying capacity of this phase continuously decreases. By assigning it a correction coefficient less than 1, the reference current of this phase is gradually reduced, and the output power of this phase is smoothly reduced. Overall, the power carrying capacity of the two phases is matched by a large and a small differential correction coefficient, avoiding the current shock caused by a sudden increase in the power of one phase and a sudden decrease in the power of the other phase.

[0095] The correction coefficients for the two phases in the transition zone can be fixed or dynamically changed. For example, the correction coefficient of the phase participating in the wave generation with the first changing trend increases linearly, while the correction coefficient of the phase participating in the wave generation with the second changing trend decreases linearly. This linear dynamic adjustment mechanism of the correction coefficients allows the two phases to gradually and smoothly transfer the reference current carrying capacity within the transition zone, avoiding sudden current changes caused by the sudden withdrawal or addition of a phase, resulting in a better smoothing effect on the current.

[0096] 2032: Correct the reference current of the corresponding wave-generating phase according to the correction factor.

[0097] There are several ways to correct the reference current of the corresponding wave-generating phase based on the correction factor. In one possible implementation, the correction factor for the wave-generating phase with the first changing trend is greater than 1, and the correction factor for the wave-generating phase with the second changing trend is less than 1. The corrected reference current is obtained by multiplying the correction factor by the reference current of the corresponding wave-generating phase. In another possible implementation, the correction factor for the wave-generating phase with the first changing trend is greater than 0, and the correction factor for the wave-generating phase with the second changing trend is less than 0. The corrected reference current is obtained by adding the correction factor to the reference current of the corresponding wave-generating phase. The above two implementations are merely examples and are not intended to limit the scope of this application.

[0098] Through the above corrections, the corrected reference current of the participating phase in the first trend of change is greater than the original reference current, and the corrected reference current of the participating phase in the second trend of change is less than the original reference current. This ensures that during the switching of the working area, the phase that is about to enter the clamping area and gradually withdraws from modulation can be smoothly transferred to the phase that is about to enter the normal area and gradually assumes power, thus achieving a smooth transition of the main power-bearing phase.

[0099] This embodiment fundamentally solves the technical problems faced by DCM control in three-phase high-power systems, such as high system coupling, strong hardware dependence, poor multi-phase coordination, and unstable operating condition switching, by introducing a phase angle-based regional state machine mechanism and multi-phase cooperative scheduling logic.

[0100] In one possible implementation, based on the reference current of the phase involved in the wave generation, a switching timing control signal for the phase involved in the wave generation is output, including the following steps 2041-2044:

[0101] 2041: Determine the conduction delay of the corresponding switch based on the reference current of the phase involved in the wave generation.

[0102] 2042: Based on the proportional coefficient between the peak inductor current of the wave-generating phase and the reference current fitted by the conduction delay, the peak inductor current of the wave-generating phase is obtained.

[0103] 2043: Determine the on-time and off-time of the corresponding switch based on the peak current of the inductor participating in the wave generation phase.

[0104] 2044: Output the switching on timing control signal for the phase participating in the wave generation. The switching on timing control signal includes: the on time, the off time, and the on delay.

[0105] The phases involved in wave generation include those in the normal region and those in the transition region. Phases in the clamping region do not participate in wave generation and are not subject to the timing calculations described below.

[0106] On-time ( The conduction time is the duration during which a power switching device remains on within a single switching cycle. Assuming a fixed voltage across the inductor, the inductor current rises at a constant rate; the conduction time is primarily used to control the peak value of the inductor current.

[0107] Shutdown time ( The duration of the inductor releasing energy through the freewheeling circuit after the power switching device is turned off, until the inductor current drops to zero, ensures that the inductor energy is fully released and that the circuit operates stably in discontinuous conduction mode (DCM).

[0108] On delay ( This is the idle waiting time after the inductor current returns to zero and before the next switch is turned on. This parameter is mainly used to adjust the switching frequency and optimize dead-time control to prevent bridge arm shoot-through.

[0109] Both the normal and transition regions share a common timing generation method based on feedforward control: using the reference current as input, the on-time of the corresponding switch is determined through a preset mapping relationship, and then the on-time and off-time of the corresponding switch are calculated, without the need for real-time acquisition of inductor current for closed-loop correction. This mapping relationship can be stored in a lookup table or calculated in real time through a preset switch on-time timing function.

[0110] For a three-phase six-switch topology circuit, the inductor current variation under discontinuous conduction mode (DCM) is as follows:

[0111] ;

[0112] This represents the instantaneous voltage difference across the single-phase cascaded inductor. dI / dt is the nominal inductance of the input inductor in the PFC main circuit, and dI / dt is the instantaneous rate of change of the inductor current. The system controls the on / off state of the power switching devices in each phase, thereby changing the voltage across the inductor and thus regulating the rise and fall rates of the inductor current.

[0113] When the lower transistor of the power switch is turned on and the upper transistor is turned off, the inductor is connected to the AC input voltage circuit, and the instantaneous voltage across the inductor is... >0, according to the above formula It can be seen that dI / dt>0, the inductor current rises linearly, and the inductor generates a positive voltage drop. This stage corresponds to the switch conduction time ( ).

[0114] When both the high-side and low-side transistors of the power switch are turned off, the inductor releases energy to the DC bus through the freewheeling branch, and the inductor is subjected to a reverse voltage. When dI / dt < 0, the inductor current decreases linearly, and the inductor generates a reverse induced voltage. This stage corresponds to the switch turn-off time. ).

[0115] When the inductor current drops to zero, the current no longer changes, and at this point dI / dt=0. This resting phase corresponds to the switch conduction delay ( ).

[0116] The complete timing parameter calculation process follows the following: Figure 5 The calculation sequence shown is as follows: the voltage loop outputs the total reference current of the entire unit, which is then transformed to obtain the original reference current of each phase. The two phases in the transition region correct their original reference currents according to the changing trend of the working area, resulting in the final reference current of each phase. Using the reference current of the phase participating in the wave generation as input, the conduction delay is obtained based on the mapping relationship between the reference current and the conduction delay. Then, based on the proportional coefficient between the peak inductor current of the emitting phase and the reference current fitted by the conduction delay, the peak inductor current of the emitting phase is obtained. Then, the peak inductor current of the emitting phase and the instantaneous voltage across the inductor are input into the above DCM current variation law to calculate the conduction time of the corresponding switch. ) and shutdown time ( Finally, the output is the switching timing control signal for the phase wave generation.

[0117] A complete switching cycle satisfies the following relationship: .because , , The total switching period will be dynamically adjusted according to the reference current, ultimately resulting in a total switching cycle. Since the values ​​are dynamically variable, the entire system adopts frequency conversion control and there is no fixed switching cycle constraint.

[0118] The switch turn-on timing control signal is a digital pulse sequence that ultimately drives the switching devices in the main power circuit. The controller packages the calculated turn-on delay, turn-on time, and turn-off time parameters according to a specific communication protocol or register format to generate the signal. For example, the controller loads these three parameters into the comparison register of the PWM generation module, thereby outputting a drive waveform with precise timing and phase offset at the physical port.

[0119] The switch-on timing control signal is sent to the three-phase six-switch topology circuit to achieve precise control of the power-generating phases in the transition and normal regions. Specifically, the switch-on timing control signal for phase A controls the on / off timing of the power switches on the upper and lower arms of phase A; the switch-on timing control signal for phase B controls the on / off timing of the power switches on the upper and lower arms of phase B; and the switch-on timing control signal for phase C controls the on / off timing of the power switches on the upper and lower arms of phase C. This output directly affects the power conversion stage, ensuring continuous and low-distortion output of the inductor current in the transition region and effectively suppressing current oscillations caused by switching between operating regions.

[0120] In one possible implementation, step 2041 above includes: obtaining a mapping table between reference current and conduction delay, wherein the reference current and conduction delay are negatively correlated; and querying the mapping table based on the reference current of the participating phase to obtain the conduction delay of the corresponding switch.

[0121] The phases involved in the wave generation include the phases in the normal region and the phases in the transition region, with each phase corresponding to a set of power switches on the upper and lower bridge arms.

[0122] The mapping table between the reference current and the conduction delay is a data structure pre-stored in the controller memory, used to characterize the mapping relationship between the reference current and the conduction delay.

[0123] This mapping table can be obtained through offline calibration or simulation calculation. Under heavy load conditions, the reference current participating in the ionizing phase is larger, requiring the inductor to accumulate a larger average current in a single cycle. Therefore, a longer turn-on and turn-off time is allocated, and the turn-on delay after the inductor current returns to zero is compressed. Conversely, under light load conditions, the reference current participating in the ionizing phase is smaller, requiring a smaller average inductor current. The turn-on and turn-off times are shortened, and the inductor current is quickly released to zero, lengthening the turn-on delay. Therefore, the reference current and turn-on delay are negatively correlated. This mapping table serves as the basis for feedforward control, allowing the system to directly obtain control parameters without solving complex differential equations or performing iterative calculations in real time during operation. For example, the reference current range can be divided into several intervals, each corresponding to a turn-on delay. If the reference current value precisely matches the index value in the table, the turn-on delay corresponding to that index value is directly read. If the reference current value lies between two index values ​​in the table, the accurate turn-on delay can be calculated using a linear interpolation algorithm, or the turn-on delay corresponding to the nearest index value can be selected. By using this pre-stored table method, complex physical model calculations can be transformed into simple data storage, significantly reducing the computational burden on the controller.

[0124] In one possible implementation, step 2043 above can be implemented by inputting the peak current of the inductor participating in the wave generation phase into a preset switch turn-on timing function to obtain the turn-on time and turn-off time of the corresponding switch.

[0125] A preset switch turn-on timing function is a pre-constructed mathematical model that characterizes the mapping relationship between the inductor peak current and the switch turn-on timing parameters (turn-on time and turn-off time). Its input variable is the inductor peak current participating in the voltammetric phase, and its output variables are the turn-on time (Ton) and turn-off time (Toff) of the corresponding power switching device. Specifically, this preset switch turn-on timing function can be established through polynomial fitting, neural network models, or other nonlinear regression algorithms, achieving continuous analytical calculation from the inductor peak current to the time parameters.

[0126] By directly inputting the inductor peak current into a preset switch turn-on timing function, the controller memory resources occupied by storing large-scale lookup tables can be avoided, significantly reducing the demand for hardware storage capacity. Simultaneously, the function mapping method can smoothly adjust the switch turn-on timing when the inductor peak current changes slightly, improving control accuracy.

[0127] This application also provides a power factor correction control device; please refer to [link to relevant documentation]. Figure 6 The power factor correction control device includes:

[0128] Phase-locked unit 601 is used to obtain the phase angle of the power grid;

[0129] The region determination unit 602 is used to determine the working regions of the three phases according to the power grid phase angle. The working regions are divided into a normal region, a clamping region, and a transition region between the normal region and the clamping region according to the power grid cycle. When two phases are in the normal region and the remaining phase is in the clamping region, the two phases in the normal region participate in wave generation, and the phase in the clamping region does not participate in wave generation. When two phases are in the transition region and the remaining phase is in the normal region, all three phases participate in wave generation.

[0130] The collaborative scheduling unit 603 is used to correct the reference current of the two phases in the transition zone according to the working area change trend when two phases are in the transition zone and the remaining phase is in the normal zone, so as to keep the reference current of the phase in the normal zone unchanged.

[0131] The timing generation unit 604 is used to output the switching on timing control signal of the participating phase based on the reference current of the participating phase.

[0132] The phase-locked unit 601, the region determination unit 602, the cooperative scheduling unit 603, and the timing generation unit 604 interact through a standard interface.

[0133] By setting up standard interfaces, each unit is logically independent. Algorithm updates or parameter adjustments in one unit will not affect the internal implementation of other units, as long as the interface definition is followed. This interaction method supports modular design, allowing phase-locked loop (PLL) units, region determination units, cooperative scheduling units, and timing generation units to exist as software modules. This reduces coupling, ensuring that each functional module has a single responsibility and operates independently, limiting the scope of fault impact and improving the overall stability of the system. Furthermore, it supports independent development, debugging, and iteration of modules, reducing development and maintenance difficulty. At the same time, common modules can be reused, improving code reusability.

[0134] In one possible implementation, the cooperative scheduling unit 603 is specifically configured to determine the correction coefficients of the two phases in the transition zone based on the working area change trend, wherein the working area change trend includes: a first change trend of entering the normal zone from the transition zone, and a second change trend of entering the clamping zone from the transition zone; the correction coefficient of the participating phase in the first change trend is greater than the correction coefficient of the participating phase in the second change trend; and the reference current corresponding to the participating phase is corrected according to the correction coefficient.

[0135] In one possible implementation, the timing generation unit 604 includes:

[0136] The first determining subunit determines the conduction delay of the corresponding switch based on the reference current of the participating wave-generating phase;

[0137] The second determining subunit is used to obtain the peak inductor current of the participating phase by fitting the ratio coefficient of the peak inductor current of the participating phase to the reference current based on the conduction delay.

[0138] The third determining subunit is used to determine the on-time and off-time of the corresponding switch based on the peak current of the inductor in the participating wave phase.

[0139] The output subunit is used to output the switching on-time control signal of the participating wave-generating phase, the switching on-time control signal including: the on-time, the off-time and the on-delay.

[0140] In one possible implementation, the first determining subunit is specifically used to obtain a mapping table between the reference current and the conduction delay, wherein the reference current and the conduction delay are negatively correlated; and to obtain the conduction delay of the corresponding switch by querying the mapping table according to the reference current of the participating phase.

[0141] In one possible implementation, the first determining subunit is specifically used to input the peak current of the inductor participating in the ripple phase into a preset switch turn-on timing function to obtain the turn-on time and the turn-off time of the corresponding switch.

[0142] In one possible implementation, the region determination unit 602 is specifically used to determine the working region of the three phases according to the grid phase angle range corresponding to the three different working regions of the three phases respectively; when two phases are in the normal region and the remaining phase is in the clamping region, the region state machine is controlled to set the cooperation flag bit to an invalid state; when two phases are in the transition region and the remaining phase is in the normal region, the region state machine is controlled to set the cooperation flag bit to an active state.

[0143] In one possible implementation, the power factor correction control device further includes:

[0144] A single-phase control unit is used to perform coordinate transformation on the total reference current to obtain the three-phase single-phase reference current when the coordination flag is in an invalid state.

[0145] This embodiment provides a power factor correction control device that divides the power grid cycle into a normal zone, a clamping zone, and a transition zone between the normal zone and the clamping zone. By acquiring the grid phase angle, the operating regions of the three phases are determined. When two phases are in the normal zone and the remaining phase is in the clamping zone, the corresponding phase in the clamping zone stops generating waveforms, and only the two phases in the normal zone participate in waveform generation. When two phases are in the transition zone and the remaining phase is in the normal zone, all three phases participate in waveform generation. The reference current of the two phases in the transition zone is corrected according to the regional change trend. Then, a corresponding switch conduction sequence control signal is generated based on the reference current of all participating waveform phases to achieve power factor correction in intermittent conduction mode. This application eliminates the need for phase-by-phase current sampling and zero-crossing detection circuits, effectively reducing the hardware cost of the power factor correction module. At the same time, by dynamically adjusting the reference current participating in waveform generation in the transition zone, a smooth switching of the transition zone control strategy is achieved, effectively suppressing current distortion and improving system stability.

[0146] This application also provides a power module; please refer to [link / reference]. Figure 7 The power supply module includes: a DC-DC converter module 20 and any of the power factor correction modules 10 provided in the embodiments of this application;

[0147] The input terminal of the DC-DC converter module 20 is connected to the DC output side of the power factor correction module 10.

[0148] The DC-DC converter module 20 can be a DC-DC unit. The power factor correction module 10 outputs a stable DC voltage, which is then converted into a secondary voltage and power by the DC-DC converter module 20 to supply power to the downstream load.

[0149] Taking the application of power modules in charging piles as an example, the power modules built into the charging piles include a power factor correction module and a DC-DC converter module. The power factor correction module, as a front-end circuit, is connected to the AC power provided by the power grid and performs power factor correction on the input power, outputting a stable DC voltage. The DC-DC converter module uses a DC / DC unit, whose input terminal is connected to the DC output side of the power factor correction module. It performs voltage conversion and voltage regulation on the DC power output from the front-end, and finally outputs DC power that is adapted to the load of the charging pile.

[0150] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape) or a semiconductor medium (e.g., solid-state disk (SSD)).

[0151] This application also provides a readable storage medium for storing the methods provided in the above embodiments. Examples include random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (EPROM), registers, hard disks, removable disks, or any other form of storage medium in the art.

[0152] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Regarding the methods disclosed in the embodiments, since they correspond to the product embodiments disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the description of the product embodiments.

[0153] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power factor correction control method, characterized in that, include: Obtain the power grid phase angle; Based on the grid phase angle, the working areas of the three phases are determined respectively. The working areas are divided according to the grid cycle into: a normal zone, a clamping zone, and a transition zone between the normal zone and the clamping zone. When two phases are in the normal zone and the remaining phase is in the clamping zone, both phases in the normal zone participate in wave generation, while the phase in the clamping zone does not participate in wave generation. When two phases are in the transition zone and the remaining phase is in the normal zone, all three phases participate in wave generation. When two phases are in the transition region and the remaining phase is in the normal region, the reference currents of the two phases in the transition region are corrected according to the changing trend of the working area, while keeping the reference current of the phase in the normal region unchanged. Based on the reference current of the phase involved in the wave generation, output the switching timing control signal of the phase involved in the wave generation.

2. The power factor correction control method according to claim 1, characterized in that, The step of correcting the reference currents of the two phases in the transition region according to the changing trend of the working region includes: Based on the changing trend of the working area, the correction coefficients of the two phases in the transition zone are determined, wherein the changing trend of the working area includes: a first changing trend that will lead from the transition zone to the normal zone, and a second changing trend that will lead from the transition zone to the clamping zone; the correction coefficient of the wave-generating phase in the first changing trend is greater than the correction coefficient of the wave-generating phase in the second changing trend. The reference current corresponding to the wave-generating phase is corrected according to the correction factor.

3. The power factor correction control method according to claim 1, characterized in that, The step of outputting the switching on-time control signal of the participating phase based on the reference current of the participating phase includes: The on-time of the corresponding switch is determined based on the reference current of the phase involved in the wave generation. The peak current of the inductor in the participating phase is obtained by fitting the ratio coefficient of the peak current of the inductor in the participating phase to the reference current based on the conduction delay. Based on the peak current of the inductor participating in the wave generation phase, determine the on-time and off-time of the corresponding switch; Output the switching on timing control signal of the phase participating in the wave generation, the switching on timing control signal including: the on time, the off time and the on delay.

4. The power factor correction control method according to claim 3, characterized in that, The step of determining the conduction delay of the corresponding switch based on the reference current of the participating wave-generating phase includes: Obtain the mapping table between reference current and conduction delay, where the reference current and conduction delay are negatively correlated; The on-time of the corresponding switch is obtained by querying the mapping table based on the reference current of the phase involved in the wave generation.

5. The power factor correction control method according to claim 3, characterized in that, The step of determining the on-time and off-time of the corresponding switch based on the peak inductor current of the participating wave-generating phase includes: The peak current of the inductor participating in the wave generation phase is input into a preset switch turn-on timing function to obtain the turn-on time and turn-off time of the corresponding switch.

6. The power factor correction control method according to claim 1, characterized in that, The step of determining the working areas of the three phases based on the power grid phase angle includes: Based on the pre-defined power grid phase angle range corresponding to the three different working areas of the three phases, the working areas of the three phases are determined respectively; When two phases are in the normal region and the remaining phase is in the clamping region, the control area state machine will set the coordination flag to an invalid state; When two phases are in the transition region and the remaining phase is in the normal region, the control region state machine sets the coordination flag to an active state.

7. The power factor correction control method according to claim 6, characterized in that, The power factor correction control method further includes: When the coordination flag is invalid, the total reference current is transformed by coordinate transformation to obtain the single-phase reference current of the three phases.

8. A power factor correction control device, characterized in that, include: Phase-locked unit (PLU) is used to obtain the phase angle of the power grid; The region determination unit is used to determine the working regions of the three phases according to the power grid phase angle. The working regions are divided into a normal region, a clamping region, and a transition region between the normal region and the clamping region according to the power grid cycle. When two phases are in the normal region and the remaining phase is in the clamping region, the two phases in the normal region participate in wave generation, and the phase in the clamping region does not participate in wave generation. When two phases are in the transition region and the remaining phase is in the normal region, all three phases participate in wave generation. The coordinated scheduling unit is used to correct the reference current of the two phases in the transition zone according to the working area change trend when two phases are in the transition zone and the remaining phase is in the normal zone, so as to keep the reference current of the phase in the normal zone unchanged. The timing generation unit is used to output the switching on timing control signal of the participating phase based on the reference current of the participating phase. The phase-locked unit, the region determination unit, the cooperative scheduling unit, and the timing generation unit interact through a standard interface.

9. A power factor correction module, characterized in that, Includes the main power circuit and controller; The main power circuit includes: a voltage sampling circuit and a three-phase six-switch topology circuit; The output of the voltage sampling circuit is connected to the analog sampling input of the controller, and is used to send the grid voltage sampling signal to the controller. The controller determines the grid phase angle based on the grid voltage sampling signal, and determines the working area of ​​each of the three phases based on the grid phase angle. The working area is divided according to the grid cycle into a normal zone, a clamping zone, and a transition zone between the normal zone and the clamping zone. When two phases are in the normal zone and the remaining phase is in the clamping zone, both phases in the normal zone participate in wave generation, while the phase in the clamping zone does not participate. When two phases are in the transition zone and the remaining phase is in the normal zone, all three phases participate in wave generation. When two phases are in the transition zone and the remaining phase is in the normal zone, the reference current of the two phases in the transition zone is corrected according to the working area change trend, while keeping the reference current of the phase in the normal zone unchanged. Based on the reference current of the phase participating in wave generation, the controller outputs the switching timing control signal for the phase participating in wave generation. The switch conduction timing control signal drives the corresponding power switch in the three-phase six-switch topology circuit to turn on and off.

10. A power supply module, characterized in that, include: DC-DC converter module and power factor correction module as described in claim 9; The input terminal of the DC-DC converter module is connected to the DC output side of the power factor correction module.

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