PFC topology circuit and control method thereof, power supply device and electrical equipment

Abstract

The invention discloses a PFC topology circuit and a control method thereof, a power supply device and electrical equipment, and relates to the field of power supplies, the PFC topology circuit comprises an inductance module, a bridge circuit, a bus output module, a change-over switch module, a detection module and a control module; the bridge circuit is used for synchronously rectifying the AC voltage and then outputting the AC voltage when the inductance module releases energy; the bus output module comprises at least two bus capacitors which are connected in series; the detection module detects AC voltage input by the power supply input end; when the change-over switch module is switched on, a plurality of capacitors in the bus output module are alternately charged; all capacitors in the bus output module are charged during turn-off; the control module controls the switch-on or switch-off of the change-over switch module according to the magnitude of the detected alternating voltage, so that the capacitor charging mode of the bus output module is matched with the input alternating voltage. The invention aims to improve the adaptive capacity of the PFC topology circuit so as to improve the flexibility and compatibility of the power supply device.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, and in particular to PFC topology circuits and their control methods, power supply devices and electrical equipment. Background Technology

[0002] Electrical equipment using frequency conversion technology typically incorporates a PFC (Power Factor Correction) circuit. On one hand, the PFC circuit can improve the utilization rate of the mains power during AC-DC conversion and reduce energy loss during the conversion process, thereby saving energy. On the other hand, the PFC circuit can also reduce harmonic pollution in the power grid.

[0003] Currently, PFC circuits can only meet voltage requirements within a certain range and cannot meet wider voltage requirements, resulting in a relatively small variable dynamic range. Summary of the Invention

[0004] The main objective of this invention is to provide a PFC topology circuit and its control method, power supply device and electrical equipment, which aims to improve the adaptability of the PFC topology circuit and thus improve the flexibility and compatibility of the power supply device.

[0005] To achieve the above objectives, this invention proposes a PFC topology circuit, which includes a power input terminal, an inductor module, a bridge circuit, a bus output module, a switching module, a detection module, and a control module. The inductor module is used to alternately store / release energy as the AC voltage changes within a target cycle. The bridge circuit is used to adjust the direction of the current flowing through the inductor module and to synchronously rectify and output the AC voltage when the inductor module releases energy. The bus output module includes at least two bus capacitors connected in series.

[0006] The detection module is used to detect the AC voltage input to the power input terminal;

[0007] The switching module is used to alternately charge multiple capacitors in the bus output module when it is turned on, and to charge all capacitors in the bus output module when it is turned off.

[0008] The control module is used to control the switching module to turn on or off according to the magnitude of the detected AC voltage, so that the capacitor charging mode of the bus output module matches the input AC voltage.

[0009] In one embodiment, the control module is specifically configured to control the switching module to turn on when the detected AC voltage is less than or equal to a first preset voltage threshold, so as to alternately charge multiple capacitors in the bus output module; and to control the switching module to turn off when the detected AC voltage is greater than a second preset voltage threshold, so as to charge all capacitors in the bus output module; wherein the first preset voltage threshold is less than or equal to the second preset voltage threshold.

[0010] In one embodiment, the bus output module includes a first bus capacitor and a second bus capacitor; the control module is configured to charge the first bus capacitor when the detected AC voltage is less than a first preset voltage threshold and is within the positive half-cycle of the target period of the AC voltage, and to charge the second bus capacitor when the AC voltage is less than the first preset voltage threshold and is within the negative half-cycle of the target period of the AC voltage.

[0011] And, when the detected AC voltage is greater than a second preset voltage threshold and within one cycle of the target period of the AC voltage, the first bus capacitor and the second bus capacitor are charged.

[0012] In one embodiment, the PFC topology circuit further includes a bus voltage detection module for detecting the bus voltage output by the bus output module and outputting it to the control module;

[0013] The control module is used to adjust the duty cycle of the switching transistor in the bridge circuit according to the relationship between the bus voltage and the target bus voltage range, so as to adjust the bus voltage to the target bus voltage range.

[0014] In one embodiment, the control module is further configured to control the switching module to be turned on during a first preset time period and turned off during a second preset time period when the AC voltage is greater than a first preset voltage threshold and less than or equal to a second preset voltage threshold.

[0015] In one embodiment, the bridge circuit includes a first bridge arm and a second bridge arm connected in parallel. The first bridge arm includes a first switch and a second switch connected in series. The second bridge arm includes a third switch and a fourth switch connected in series. The PFC topology circuit includes a first inductor energy storage state and a first capacitor charging state.

[0016] The control module is specifically used for:

[0017] If the detected AC voltage is less than or equal to a first preset voltage threshold, the second and fourth switches are turned on, and the first and third switches are turned off; or...

[0018] The first and third switching transistors are controlled to be turned on, and the second and fourth switching transistors are controlled to be turned off, so that the PFC topology circuit operates in the first inductor energy storage state.

[0019] And, specifically used for:

[0020] If the detected AC voltage is less than or equal to a first preset voltage threshold, the first switch and the switching module are turned on, and the second, third, and fourth switches are turned off, or...

[0021] The second switch and the switching module are turned on, and the first, third, and fourth switches are turned off, so that the PFC topology circuit operates in the first capacitor charging state.

[0022] In one embodiment, the bridge circuit includes a first bridge arm and a second bridge arm connected in parallel. The first bridge arm includes a first switch and a second switch connected in series. The second bridge arm includes a third switch and a fourth switch connected in series. The PFC topology circuit includes a second inductor energy storage state and a second capacitor charging state.

[0023] The control module is specifically used for:

[0024] If the detected AC voltage is greater than the second preset voltage threshold, control the second and fourth switches to turn on, and control the first and third switches to turn off, or...

[0025] The first and third switching transistors are controlled to be turned on, and the second and fourth switching transistors are controlled to be turned off, so that the PFC topology circuit operates in the second inductor energy storage state.

[0026] And, specifically used for:

[0027] If the detected AC voltage is greater than the second preset voltage threshold, control the first and fourth switches to turn on, and control the second and third switches to turn off, or...

[0028] The second and third switches are turned on, and the first and fourth switches are turned off, so that the PFC topology circuit operates in the second capacitor charging state.

[0029] In one embodiment, the control module is further configured to control the switching module to turn off during the initial power-on phase of the load, and obtain the operating frequency of the load; and to determine the target bus voltage corresponding to the load based on the operating frequency of the load.

[0030] In one embodiment, the bridge circuit includes a first bridge arm and a second bridge arm connected in parallel. The first bridge arm includes a first switch and a second switch connected in series. The second bridge arm includes a third switch and a fourth switch connected in series. A first terminal of the inductor module is connected to one end of the power input terminal. A second terminal of the inductor module is connected to the common terminal of the first and second switches. The other end of the power input terminal is connected to the common terminal of the third and fourth switches. The bus output module is connected in parallel with the output terminal of the bridge circuit. A first terminal of the switching module is connected to the common terminal of the third and fourth switches. A second terminal of the switching module is connected to the bus output module.

[0031] In one embodiment, the switching module includes a fifth switching transistor and a sixth switching transistor. The first end of the fifth switching transistor is connected to one end of the power input terminal, the second end of the fifth switching transistor is connected to the first end of the sixth switching transistor, and the second end of the sixth switching transistor is connected to the bus output module.

[0032] The present invention also proposes a power supply device comprising the PFC topology circuit described above.

[0033] The present invention also proposes an electrical device, the electrical device comprising the PFC topology circuit described above;

[0034] And / or, including the power supply device as described above.

[0035] The present invention also proposes a control method for a PFC topology circuit, based on the PFC topology circuit described in any of the above claims, wherein the control method for the PFC topology circuit includes:

[0036] Obtain the AC voltage connected to the PFC topology circuit;

[0037] The switching module is turned on or off according to the magnitude of the AC voltage, so that the capacitor charging mode of the bus output module matches the input AC voltage; wherein, when the switching module is on, multiple capacitors in the bus output module are charged alternately; when the switching module is off, all capacitors in the bus output module are charged.

[0038] In one embodiment, controlling the switching module to turn on or off based on the detected AC voltage specifically includes:

[0039] When the AC voltage is less than or equal to the first preset voltage threshold, the switching module is turned on to alternately charge multiple capacitors in the bus output module.

[0040] When the AC voltage is greater than the second preset voltage threshold, the switching module is controlled to turn off in order to charge all the capacitors in the bus output module; wherein, the first preset voltage threshold is less than or equal to the second preset voltage threshold.

[0041] The PFC topology circuit of this invention can control the on / off state of the switching module according to the AC voltage, so that the capacitor charging method of the bus output module matches the input AC voltage. Therefore, compared with existing PFC topologies that can only meet voltage requirements within a certain range, it can be applied to a wider range of AC voltages, meeting different voltage system requirements, improving the adaptability of the PFC topology circuit, and thus improving the flexibility and compatibility of the power supply device. Attached Figure Description

[0042] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the functional modules provided in an embodiment of the PFC topology circuit of the present invention;

[0045] Figure 2 A specific circuit diagram is provided for an embodiment of the PFC topology circuit of the present invention;

[0046] Figure 3 This is a working path diagram of the second inductor's energy storage state on the positive half-axis of the AC voltage, provided in an embodiment of the PFC topology circuit of the present invention.

[0047] Figure 4 This is a working path diagram of the charging state of the second capacitor on the positive half-axis of the AC voltage provided in an embodiment of the PFC topology circuit of the present invention;

[0048] Figure 5This is a working path diagram of the second inductor energy storage state on the negative half-axis of the AC voltage provided in an embodiment of the PFC topology circuit of the present invention.

[0049] Figure 6 This is a working path diagram of the charging state of the second capacitor on the negative half-axis of the AC voltage provided in an embodiment of the PFC topology circuit of the present invention.

[0050] Figure 7 This is a working path diagram of the first inductor energy storage state on the positive half-axis of the AC voltage, provided in an embodiment of the PFC topology circuit of the present invention.

[0051] Figure 8 This is a working path diagram of the first capacitor charging state on the positive half-axis of the AC voltage provided in an embodiment of the PFC topology circuit of the present invention;

[0052] Figure 9 This is a working path diagram of the first inductor energy storage state on the negative half-axis of the AC voltage, provided in an embodiment of the PFC topology circuit of the present invention.

[0053] Figure 10 This is a working path diagram of the charging state of the first capacitor on the negative half-axis of the AC voltage provided in an embodiment of the PFC topology circuit of the present invention.

[0054] Figure 11 This is a waveform diagram of the control logic of each switch under different input voltages or different required bus voltages, provided for an embodiment of the PFC topology circuit of the present invention.

[0055] Figure 12 A flowchart illustrating an embodiment of the control method for the PFC topology circuit of the present invention;

[0056] Figure 13 This is a flowchart illustrating another embodiment of the control method for the PFC topology circuit of the present invention.

[0057] Explanation of icon numbers:

[0058] 10. Power input terminal; 20. Inductor module; 30. Bridge circuit; 40. Switching module; 50. Bus output module; 60. Detection module; 70. Control module; 80. Bus voltage detection module.

[0059] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0060] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of the present invention and are not intended to limit the present invention.

[0061] To better understand the technical solution of the present invention, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0062] PFC topologies are increasingly used in power supply technology because they can reduce rectification losses. However, currently, PFC can only meet voltage requirements within a certain range and cannot meet wider voltage requirements, resulting in a small dynamic range. Alternatively, PFC topologies may be relatively simple, with a single operating mode, lacking compatibility with other topologies and unable to achieve multi-mode operation; the applicability of PFC circuit structures is limited and cannot meet the needs of different loads.

[0063] Therefore, the present invention provides a PFC topology circuit that can switch the operating mode according to the load adaptability, is compatible with different input voltages, has strong adaptability, can meet the requirements of different voltage ranges and different loads, and is conducive to improving the adaptability of the product.

[0064] This PFC topology circuit can be applied to power supply devices; that is, the passive PFC topology circuit can be independently integrated with the power supply device as a single product to power other devices. The PFC topology circuit is particularly suitable for electrical appliances, such as refrigeration equipment, specifically air conditioners and refrigerators, and can also be applied to other electrical appliances with motors, such as washing machines. The following embodiments of the present invention use the application of the PFC topology circuit in an air conditioner as an example. This air conditioner can be a floor-standing air conditioner, wall-mounted unit, ceiling unit, window unit, kitchen air conditioner, or portable air conditioner, etc.

[0065] Reference Figure 1 and Figure 2 In one embodiment of the present invention, a PFC topology circuit is proposed, which includes a power input terminal 10, an inductor module 20, a bridge circuit 30, a bus output module 50, a switching module 40, a detection module 60, and a control module 70. The inductor module 20 is used to alternately store / release energy as the AC voltage changes within a target cycle of the AC voltage. The bridge circuit 30 is used to adjust the direction of the current flowing through the inductor module 20, and to synchronously rectify and output the AC voltage when the inductor module 20 releases energy. The bus output module 50 includes at least two bus capacitors connected in series.

[0066] The detection module 60 is used to detect the AC voltage input to the power input terminal 10;

[0067] The switching module 40 is used to alternately charge multiple capacitors in the bus output module 50 when it is turned on, and to charge all capacitors in the bus output module 50 when it is turned off.

[0068] The control module 70 is used to control the switching module 40 to be turned on or off according to the magnitude of the detected AC voltage, so that the capacitor charging mode of the bus output module 50 is matched with the input AC voltage.

[0069] Optionally, the PFC topology circuit may also include a current transformer CT, a relay RY1, and a thermistor PTC1. The current transformer CT and the inductor module 20L1 are connected in series between the power input terminal 10AC and the bridge circuit 30. The relay RY1 is connected in series between the power input terminal 10AC and the bridge circuit 30. The thermistor PTC1 is connected in parallel across the relay RY1 to protect the relay.

[0070] It should be noted that different countries worldwide use different voltage modes. For example, China uses 220V, while Latin American countries use 115V. Therefore, multiple voltage modes exist. In the Japanese market, there are two voltage modes: 100V and 200V. To ensure compatibility with different voltage modes and improve product adaptability, the PFC topology circuit of this invention can meet the requirements of different voltage modes. It can operate in low-voltage mode, high-voltage mode, or both in a mixed mode to meet the operational needs under different voltage conditions. Ultimately, this allows the product to switch operating modes adaptably to the load.

[0071] In this embodiment, the power input terminal 10 is an AC input terminal, and the connected voltage can be 110V, 220V, 100V, or 200V. The specific voltage depends on the actual application scenario of the electrical equipment or power supply device powered by the PFC topology circuit. The load connected to the DC bus BUS can be a motor, specifically a compressor or fan in an air conditioner; in this embodiment, a compressor is selected as the load.

[0072] In this embodiment, the inductor module 20 can be implemented using an inductor module composed of a single inductor or multiple inductors connected in parallel. The bridge circuit 30 can be implemented using a synchronous rectifier bridge, replacing the rectifier bridge composed of discrete diodes used in existing solutions. The switching transistors in the bridge circuit 30 can be IGBTs, MOSFETs, SiC transistors, GaN devices, etc. In this embodiment, four discrete IGBTs can be used. The four IGBTs are designated as the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4. The emitter of the first switch Q1 is interconnected with the collector of the second switch Q2 and the live wire of the power input terminal 10; the collector of the first switch Q1 is interconnected with the collector of the third switch Q3 and the positive terminal of the DC bus BUS; the emitter of the third switch Q3 is interconnected with the neutral wire of the power input terminal 10, the collector of the fourth switch Q4, and the input terminal of the switching module 40; the emitter of the second switch Q2 is interconnected with the emitter of the fourth switch Q4 and the negative terminal of the DC bus BUS. The bus output module 50 can be composed of multiple capacitors connected in series. In this embodiment, two capacitors C1 and C2 are used in series. The detection module 60 can be implemented using a voltage detection circuit, which can specifically be implemented using a voltage divider network composed of two or more resistors, a voltage comparator, a dedicated voltage detection chip, or a main controller, etc. The control module 70 can be implemented using a main controller, such as an MCU (Micro Controller Unit), FPGA (Field Programmable Gate Array), PLC (Programmable Logic Controller), DSP (Digital Signal Processor), or SOC (System on Chip). The switching module 40 can be implemented using at least one switching transistor, specifically an IGBT, MOSFET, SiC, GaN device, etc. Alternatively, a bidirectional controllable high-frequency switch can be selected. In this embodiment, the switching module 40 consists of a fifth switching transistor Q5 and a sixth switching transistor Q6. The collector of the fifth switching transistor is connected to the neutral line of the power input terminal 10, the emitter of the fifth switching transistor is connected to the emitter of the sixth switching transistor, and the collector of the sixth switching transistor is connected to the common terminal of the first bus capacitor C1 and the second bus capacitor C2.

[0073] Understandably, the detection module 60 can detect the AC voltage connected to the power input terminal 10 in real time and output the corresponding AC voltage detection signal to the control module 70. The control module 70 controls the switching module 40 to be turned on / off according to the magnitude of the AC voltage and the preset voltage threshold, thereby controlling the PFC topology circuit to work in different working modes.

[0074] Optionally, the control module 70 is specifically configured to control the switching module 40 to conduct when the detected AC voltage is less than or equal to a first preset voltage threshold, so as to alternately charge multiple capacitors in the bus output module 50; and to control the switching module 40 to turn off when the detected AC voltage is greater than a second preset voltage threshold, so as to charge all capacitors in the bus output module 50; wherein the first preset voltage threshold is less than or equal to the second preset voltage threshold.

[0075] In this embodiment, it is assumed that the first preset voltage threshold is 160V and the second preset voltage threshold is 250V. If the AC voltage is 100V, the control module 70 controls the switching module 40 to turn on, so as to alternately charge multiple capacitors C1 and C2 in the bus output module 50; if the detection module 60 detects an AC voltage of 330V, the control module 70 controls the switching module 40 to turn off, so as to charge the first capacitor C1 and the second capacitor C2 simultaneously. In this way, the corresponding high-voltage DC bus voltage is output for use by the downstream load. The capacitor charging method includes alternating charging and simultaneous charging. The switching module 40 is controlled to turn on / off according to the relationship between the AC voltage and the first and second preset voltage thresholds, so as to match the capacitor charging method with the input AC voltage.

[0076] It should be noted that when the AC voltage is less than or equal to the first preset voltage threshold AC1, the switching module 40 cooperates with the bridge circuit 30 to rectify and boost the input AC voltage before outputting it to the DC bus BUS. At this time, the voltage output to the DC bus BUS by the bridge circuit 30 and the switching module 40 is n times the voltage independently output by the bridge circuit 30, where n is a real number greater than 0. For example, when n = n1, the LFC topology circuit is in an n1-fold voltage multiplier rectification mode; or, when n = n2, the LFC topology circuit is in an n2-fold voltage multiplier rectification mode; where n2 is greater than n1. In this embodiment, the bus output module 50 has two capacitors, so in this application, n = 2. By alternately charging C1 and C2, the LFC topology circuit is in a 2-fold voltage multiplier rectification mode, achieving voltage boosting. Furthermore, the bridge circuit 30 can be reused; that is, the bridge circuit 30 can function as a PFC circuit to perform AC-DC conversion and power factor correction, thus completing the AC-DC conversion. Simultaneously, the PFC circuit can also perform DC-DC conversion, boosting the input DC voltage and performing power factor correction to complete the DC-DC conversion. In this way, components from both AC and DC PFC circuit topologies can be reused, which helps improve component utilization and reduce costs.

[0077] The PFC topology circuit of this invention can control the on / off state of the switching module 40 according to the AC voltage, so that the capacitor charging mode of the bus output module 50 matches the input AC voltage. Thus, compared with existing PFC topologies that can only meet voltage requirements within a certain range, it can be applied to a wider range of AC voltages, meeting different voltage system requirements, improving the adaptability of the PFC topology circuit, and consequently improving the flexibility and compatibility of the power supply device.

[0078] In one embodiment, the bus output module 50 includes a first bus capacitor C1 and a second bus capacitor C2; the control module 70 is configured to charge the first bus capacitor when the detected AC voltage is less than a first preset voltage threshold and is within the positive half-cycle of the target period of the AC voltage, and to charge the second bus capacitor when the AC voltage is less than the first preset voltage threshold and is within the negative half-cycle of the target period of the AC voltage.

[0079] And, when the detected AC voltage is greater than a second preset voltage threshold and within one cycle of the target period of the AC voltage, the first bus capacitor and the second bus capacitor are charged.

[0080] In this embodiment, the target period includes at least one period.

[0081] Optionally, refer to Figure 2 The bridge circuit 30 includes a first bridge arm and a second bridge arm connected in parallel. The first bridge arm includes a first switch Q1 and a second switch Q2 connected in series. The second bridge arm includes a third switch Q3 and a fourth switch Q4 connected in series. The PFC topology circuit includes a first inductor energy storage state and a first capacitor charging state.

[0082] The control module 70 is specifically used for:

[0083] If the detected AC voltage is less than or equal to a first preset voltage threshold, the second and fourth switches are turned on, and the first and third switches are turned off; or...

[0084] The first and third switching transistors are controlled to be turned on, and the second and fourth switching transistors are controlled to be turned off, so that the PFC topology circuit operates in the first inductor energy storage state.

[0085] And, specifically used for:

[0086] If the detected AC voltage is less than or equal to a first preset voltage threshold, the first switch and the switching module 40 are controlled to turn on, and the second, third, and fourth switches are controlled to turn off, or...

[0087] The second switch and the switching module 40 are turned on, and the first switch, the third switch and the fourth switch are turned off, so that the PFC topology circuit operates in the first capacitor charging state.

[0088] In this embodiment, the first inductor energy storage state is the state in which the inductor module 20 (L1) stores energy, and the first capacitor charging state is the state in which the inductor module 20 releases energy to alternately or simultaneously charge multiple capacitors in the bus output module 50.

[0089] In this embodiment, when the AC voltage is less than or equal to the first preset voltage threshold, the fifth switch Q5 and the sixth switch Q6 of the control switching module 40 are turned on to form a high-frequency PFC topology in a low-voltage mode. When the AC voltage is within the positive half-cycle of the target period (i.e., in the positive half-wave of the AC voltage signal), the control module 70 controls the second switch Q2 and the fourth switch Q4 to turn on, storing energy for the inductor module 20L1. This forms a charging circuit for the AC power supply, CT, L1, Q2, and Q4 connected to the power input terminal 10. The PFC topology operates in the first inductor energy storage state, and the working flow diagram is shown below. Figure 7 As shown, the arrows indicate the current path. When the second switch Q2 is turned off and the first switch Q1 is turned on, the inductor L1 transfers its stored energy to the first bus capacitor C1 to charge C1. The current flows through CT, L1, Q1, electrolytic capacitors C1, Q6, and Q5, forming a discharge circuit. The PFC topology operates in the first capacitor charging state, as shown in the diagram. Figure 8 As shown. Similarly, when the AC voltage is within the negative half-cycle of the target period, during the negative half-wave of the AC voltage signal, the control module 70 first controls the third switch Q3 and the first switch Q1 to conduct, storing energy in the inductor L1. The current flows through Q3, Q1, L1, and CT, forming a charging circuit. The PFC topology circuit operates in the first inductor energy storage state, and the working flow diagram is shown below. Figure 9 As shown; after energy storage is completed, the control module 70 controls the first switch Q1 to turn off and Q2 to turn on, causing the inductor L1 to transfer energy to the second bus capacitor C2. The current flows through Q5, Q6, electrolytic capacitor C2, Q2, L1, and CT to form a discharge circuit. The PFC topology circuit operates in the first capacitor charging state, and the working flow diagram is shown below. Figure 10 As shown.

[0090] By storing and discharging energy in the inductor module 20 during the positive half-wave of the AC voltage signal, the waveform of the input current is controlled, causing the input current waveform to follow the AC voltage signal and improving input current harmonics and power factor. Furthermore, by controlling the switching module 40 to conduct, the first and second bus capacitors can be charged and discharged separately, enabling the PFC topology circuit to output a first voltage. This achieves a voltage multiplier scheme, applicable to situations where the load-demanded bus voltage is equal to twice the peak voltage of the AC power supply.

[0091] Optionally, in another embodiment, the PFC topology circuit includes a second inductor energy storage state and a second capacitor charging state;

[0092] The control module 70 is specifically used for:

[0093] If the detected AC voltage is greater than the second preset voltage threshold, control the second and fourth switches to turn on, and control the first and third switches to turn off, or...

[0094] The first and third switching transistors are controlled to be turned on, and the second and fourth switching transistors are controlled to be turned off, so that the PFC topology circuit operates in the second inductor energy storage state.

[0095] And, specifically used for:

[0096] If the detected AC voltage is greater than the second preset voltage threshold, control the first and fourth switches to turn on, and control the second and third switches to turn off, or...

[0097] The second and third switches are turned on, and the first and fourth switches are turned off, so that the PFC topology circuit operates in the second capacitor charging state.

[0098] In this embodiment, when the AC voltage is greater than the second preset voltage threshold, the control module 70 controls the fifth switch Q5 and the sixth switch Q6 to not work, that is, controls the switching module 40 to turn off, forming a high-frequency PFC topology in a high-voltage mode. When it is within the positive half-cycle of the target period of the AC voltage, that is, in the positive half-wave of the AC voltage signal, the control module 70 controls the second switch Q2 and the fourth switch Q4 to conduct, storing energy for the inductor module 20L1, forming a charging circuit for the AC power supply, CT, L1, Q2, and Q4 connected to the power input terminal 10. The PFC topology circuit operates in the second inductor energy storage state, and the working flow diagram is as follows. Figure 3As shown, the arrows indicate the current path. The switching control logic and current path are the same for both the first and second inductor energy storage states. When the second switch Q2 is turned off and the first switch Q1 is turned on, inductor L1 transfers its stored energy to capacitors C1 and C2. The current flows through CT, L1, Q1, electrolytic capacitors C1, C2, and Q4, forming a discharge circuit. The PFC topology operates in the second capacitor charging state, as shown in the diagram. Figure 4 As shown, in the second capacitor charging state, the formed discharge circuit includes capacitors C1 and C2, simultaneously charging both C1 and C2. In the first capacitor charging state, the formed amplification circuit includes either C1 or C2, alternately charging C1 and C2. When within the negative half-cycle of the target AC voltage period, during the negative half-wave of the AC voltage signal, transistors Q3 and Q1 are turned on to store energy in inductor L1. The current flows through Q3, Q1, L1, and CT, as shown in the diagram. Figure 5 As shown, the PFC topology circuit operates in the second inductor energy storage state. When control transistor Q1 is turned off and transistor Q2 is turned on, inductor L1 transfers energy to capacitors C1 and C2. The current flows through Q3, electrolytic capacitors C1 and C2, Q2, L1, and CT, forming a discharge circuit. The PFC topology circuit then operates in the second capacitor charging state. The flow diagram is shown below. Figure 6 As shown.

[0099] refer to Figure 11 This diagram shows the operating waveforms of the control logic for each switch in the PFC topology circuit under different AC voltages or different required bus voltages. Ui represents the AC voltage connected to power input terminal 10, I represents the AC current, SW represents the switching module 40, and Q1, Q2, Q3, and Q4 are the four switches in the bridge circuit 30. The control module 70 dynamically adjusts the duty cycles of SW and Q1 to Q4 based on the AC voltage and bus voltage to achieve adaptive adjustment of the output voltage.

[0100] By storing and releasing energy in the inductor module 20 during the positive half-wave of the AC voltage signal, the waveform of the input current is controlled, causing the input current waveform to follow the AC voltage signal, thereby improving input current harmonics and power factor. Furthermore, by controlling the switching module 40 to turn off, the first bus capacitor and the second bus capacitor can be charged simultaneously, causing the PFC topology circuit to output a second voltage. This second voltage is slightly higher than the peak value of the AC voltage signal but lower than the first voltage described in the above embodiment.

[0101] Optionally, refer to Figure 2 The PFC topology circuit also includes a bus voltage detection module 80, which is used to detect the bus voltage output by the bus output module 50 and output it to the control module 70.

[0102] The control module 70 is used to adjust the duty cycle of the switching transistor in the bridge circuit 30 according to the relationship between the bus voltage and the target bus voltage range, so as to adjust the bus voltage to the target bus voltage range.

[0103] In this embodiment, the bus voltage detection module 80 can be implemented using a voltage detection circuit. Specifically, the voltage detection circuit can be implemented using a voltage divider network composed of two or more resistors, a voltage comparator, a dedicated voltage detection chip, or a main controller. The load in this embodiment can be a DC inverter compressor. When the compressor is operating, different operating frequencies require different bus voltages. Therefore, researchers can pre-divide the different frequencies from low to high, label the voltage requirement for each frequency, and then perform a linear division. The bus voltage also increases with increasing frequency, finally obtaining the correspondence between frequency and required bus voltage.

[0104] The bus voltage detection module 80 can detect the actual voltage of the DC bus (BUS), or the effective value of the bus voltage, in real time. The control module 70 can obtain the operating frequency of the compressor load and calculate the current required bus voltage based on the motor's operating frequency; that is, it calculates the bus voltage value that needs to be supplied to the DC bus at different operating frequencies. Alternatively, the control module 70 can communicate with the compressor's controller, such as the outdoor unit's main controller, to determine the compressor's current required bus voltage.

[0105] It is understandable that electrical equipment uses different AC voltage values ​​in different application scenarios. In actual applications, fluctuations in the power grid, such as during peak electricity consumption periods, can also cause fluctuations in the connected voltage. This can result in the DC bus voltage being too low to meet the power supply requirements of the load, or the DC bus voltage being too high, exceeding the power supply requirements of the load. This can easily lead to the load being subjected to high voltage surges, which can damage the components in the load, such as the switching elements in the inverter circuit used to drive the compressor or the DC bus capacitor.

[0106] To address this, the present invention employs a bus voltage detection module 80 to detect the DC bus voltage, and a control module 70 to acquire the current load demand voltage. Based on the relationship between the detected DC bus voltage and the target bus voltage range (e.g., the magnitude of the current load demand voltage), a corresponding duty cycle signal is output to each switch in the bridge circuit 30 to adjust the bus voltage to the target range. Furthermore, the switching module 40 can be controlled to turn on / off to output a corresponding bus voltage value to the DC bus, ensuring the DC bus voltage meets the load's power supply requirements. The PFC topology circuit of this invention can automatically adjust the DC bus voltage according to the operating conditions of the load, such as a compressor, achieving adaptive adjustment. It can also accommodate different voltage inputs and voltage fluctuations, while protecting the DC bus capacitor voltage in the load from overvoltage damage caused by input fluctuations.

[0107] It should be noted that when the AC voltage is less than or equal to the first preset voltage threshold, the PFC topology circuit operates in low-voltage active PFC mode, and the control module 70 controls the switching module 40 to turn on; when the AC voltage is greater than the second preset voltage threshold, the PFC topology circuit operates in high-voltage active PFC mode, and the control module 70 controls the switching module 40 to turn off.

[0108] Optionally, in another embodiment, the control module 70 is further configured to control the switching module 40 to be turned on during a first preset time period and turned off during a second preset time period when the AC voltage is greater than a first preset voltage threshold and less than or equal to a second preset voltage threshold.

[0109] In this embodiment, when the detected AC voltage is greater than the first preset voltage threshold AC1 and less than or equal to the second preset voltage threshold AC2 (for example, AC1 is 160V and AC2 is 250V), if the detected AC voltage is 220V, the PFC topology circuit can be controlled to switch back and forth between low-voltage active PFC mode and high-voltage active PFC mode. Furthermore, the switching module 40 can be controlled to operate in the corresponding on / off state according to the actual operating conditions of the load, specifically switching back and forth between low-voltage active PFC mode and high-voltage active PFC mode, dynamically boosting the voltage according to the corresponding mode until the DC bus voltage meets the power supply requirements of the load. Specifically, in low-voltage active PFC mode, the switching module 40 is turned on for a first preset time period, and in high-voltage active PFC mode, the switching module 40 is turned off for a second preset time period. The first and second preset time periods need to be set based on the relationship between the detected bus voltage and the current required bus voltage of the load. At this time, the DC bus voltage is between the second voltage output in the high-voltage active PFC mode and the first voltage output in the low-voltage active PFC mode.

[0110] In this embodiment, the control module 70 can control the switch drive circuit to output a high-low level interleaved PWM signal to the switching transistors Q5 and Q6 of the switching module 40, so as to control Q5 and Q6 to switch between on and off at a certain frequency. When on and off, the working state of each device can refer to the working state in the low voltage active PFC mode and the low voltage active PFC mode described above, which will not be repeated here.

[0111] In one embodiment, the control module 70 can also compare the DC bus voltage with the load demand bus voltage when it is determined from the bus voltage detection signal output by the bus voltage detection module 80 that the DC bus voltage is less than the current demand bus voltage of the load, and control the switching module 40 to operate in one of the low voltage active PFC mode and the high voltage active PFC mode according to the comparison result.

[0112] In this embodiment, the situation where the DC bus voltage is less than the current load demand bus voltage can be that the electrical equipment is operating in 100V or 110V voltage mode, while the power supply demand of the electrical load is 200V or 220V. Alternatively, the grid voltage may fluctuate, resulting in an input voltage of only 180V or 190V. When the air conditioner starts operating, the compressor has not yet reached a stable operating stage. This can be optionally implemented in the air conditioner's cooling mode, where the room temperature is much higher than the set temperature, causing the compressor's operating frequency to continuously increase. In this case, the current load demand bus voltage is 220V.

[0113] In the above scenario, based on the actual operating conditions of the load, i.e., the compressor's operating frequency, the current required bus voltage can be determined. The real-time detected DC bus voltage is compared with the current required bus voltage to determine whether the switching module 40 is turned on or off. Since the output voltages of the low-voltage active PFC mode and the high-voltage active PFC mode are different, the specific value of the current required bus voltage can be calculated. If the current required bus voltage is less than the current required bus voltage, and the required bus voltage is twice the peak voltage of the AC power supply, then the switching module 40 can be turned on. If the required bus voltage is less than twice the peak voltage of the AC power supply, then the switching module 40 can be turned off. Thus, this embodiment can automatically adjust the PFC operating mode according to different compressor operating frequencies to meet the compressor's voltage requirements. That is, by detecting the AC voltage and bus voltage, the PFC topology circuit can be automatically controlled to operate in different voltage modes to meet the needs of different loads and different input power supplies, improving the adaptability of the PFC topology circuit.

[0114] In inverter air conditioners, the compressor frequency is automatically adjusted according to changes in ambient temperature. Referring to Table 1, the required DC bus voltage, i.e. the load demand bus voltage, will also vary depending on the compressor's operating frequency.

[0115] Table 1

[0116]

[0117] As shown in Table 1, BUS represents the calculated load demand bus voltage, BUS1 is the first target voltage threshold, BUS2 is the second target voltage threshold, and BUS3 is the third target voltage threshold. Each target voltage threshold is set in advance by the R&D personnel. When the compressor operates at a certain frequency, the required bus voltage value under the current operating conditions can be determined. During the initial power-on phase, the compressor frequency may be lower. At this time, assuming the load demand bus voltage is greater than BUS1 but less than the second target voltage threshold BUS2, the control module 70 controls the PFC topology circuit to switch between high-voltage active PFC mode and low-voltage active PFC mode. Specifically, it controls the switching switch module 40 to conduct during the first preset time period and turn off during the second preset time period. During this time, the PFC topology circuit operates in a mixed low-voltage active PFC and high-voltage active PFC mode. When the switching switch module 40 turns off during the second preset time period, the bridge circuit 30 rectifies the input AC voltage and outputs it to the DC bus BUS. When voltage fluctuates (e.g., during peak electricity consumption periods) or the compressor frequency increases, the DC bus voltage may be insufficient to meet the compressor's power supply requirements. When the load demand bus voltage (BUS) is greater than the second target voltage threshold (BUS2) but less than the third target voltage threshold (BUS3), the control module 70 controls the PFC topology circuit to switch from hybrid mode to low-voltage active PFC mode. This is achieved by increasing the bus voltage through voltage multiplier rectification to meet the demand bus voltage. In other words, the switching module 40 and the bridge circuit 30 work together to boost the output DC bus voltage after rectification and voltage multiplier boosting, thus meeting the compressor's power supply needs.

[0118] This embodiment can linearly divide the compressor operating frequency and the required bus voltage value, thereby realizing the control of the bus voltage, enabling the compressor to operate efficiently, and realizing the PFC topology circuit to automatically adjust according to the compressor load.

[0119] In conjunction with the above embodiments, in one embodiment, refer to Figure 1 and Figure 2 The bridge circuit 30 includes a first bridge arm and a second bridge arm connected in parallel. The first bridge arm includes a first switch and a second switch connected in series. The second bridge arm includes a third switch and a fourth switch connected in series. The first end of the inductor module 20 is connected to one end of the power input terminal 10. The second end of the inductor module 20 is connected to the common terminal of the first switch and the second switch. The other end of the power input terminal 10 is connected to the common terminal of the third switch and the fourth switch. The bus output module 50 is connected in parallel with the output terminal of the bridge circuit 30. The first end of the switching module 40 is connected to the common terminal of the third switch and the fourth switch. The second end of the switching module 40 is connected to the bus output module 50.

[0120] In this embodiment, the first, second, third, and fourth switching transistors can all be implemented using IGBTs, MOSFETs, SiC devices, GaN devices, etc. This embodiment uses four discrete IGBTs. The four IGBTs are designated as the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4. The first and second switching transistors are connected in parallel to form the first bridge arm, and the third and fourth switching transistors are connected in parallel to form the second bridge arm. The emitter of the first switch Q1 is interconnected with the collector of the second switch Q2 and the live wire (one end of the power input terminal 10); the collector of the first switch Q1 is interconnected with the collector of the third switch Q3 and the positive terminal of the DC bus BUS; the emitter of the third switch Q3 is interconnected with the neutral wire (the other end of the power input terminal 10), the collector of the fourth switch Q4, and the input terminal of the switching module 40; the emitter of the second switch Q2 is interconnected with the emitter of the fourth switch Q4 and the negative terminal of the DC bus BUS.

[0121] The switching module 40 includes a fifth switching transistor and a sixth switching transistor. The first end of the fifth switching transistor is connected to one end of the power input terminal 10, the second end of the fifth switching transistor is connected to the first end of the sixth switching transistor, and the second end of the sixth switching transistor is connected to the bus output module 50.

[0122] In this embodiment, the switching module 40 is composed of a fifth switching transistor Q5 and a sixth switching transistor Q6. The collector of the fifth switching transistor is connected to the neutral line of the power input terminal 10, the emitter of the fifth switching transistor is connected to the emitter of the sixth switching transistor, and the collector of the sixth switching transistor is connected to the common terminal of the first bus capacitor C1 and the second bus capacitor C2.

[0123] In one embodiment, the control module 70 is further configured to control the switching module 40 to turn off when the load is in the initial power-on phase, and to obtain the operating frequency of the load; and to determine the target bus voltage corresponding to the load based on the operating frequency of the load.

[0124] In this embodiment, when the electrical equipment is initially powered on, the magnitude of the AC voltage is unknown. To avoid excessively high DC bus voltage caused by prematurely activating the voltage multiplier rectification function in low voltage mode (i.e., turning on the switching module 40) in the event of an excessively high AC voltage, which could damage the device, the control circuit first enters high voltage mode. The control module 70 first controls the switching module 40 to turn off, making it operate in high-voltage active PFC mode, without voltage multiplier rectification, only performing ordinary rectification and voltage boosting to avoid excessively high bus voltage. Simultaneously, the relay RY1 is activated, and the electrical equipment begins to operate. Thus, the control module 70 can control the operating state of the switching circuit SW and control the PFC drive circuit to generate different PWM waveforms based on the AC voltage collected by the detection module 60 and the bus voltage collected by the bus voltage detection module 80, thereby achieving different output bus voltage values ​​to meet different compressor frequencies.

[0125] The present invention also proposes a power supply device comprising the PFC topology circuit described above.

[0126] The power supply device provided by this invention employs the PFC topology circuit in the above embodiments, which can adaptively adjust the output voltage according to load requirements and AC voltage, achieving dynamic adjustment of the output voltage to meet the needs of different load requirements and different input power supplies. Compared with the prior art, the beneficial effects of the power supply device provided by this invention are the same as those of the PFC topology circuit provided in the above embodiments, and other technical features in the power supply device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0127] The present invention also proposes an electrical device, the electrical device comprising the PFC topology circuit described above;

[0128] And / or, including the power supply device as described above.

[0129] The electrical device provided by this invention employs the PFC topology circuit in the above embodiments, enabling it to adaptively adjust the output voltage according to load requirements and AC voltage, achieving dynamic adjustable output voltage to meet the needs of different loads and different input power supplies. Compared with the prior art, the beneficial effects of the electrical device provided by this invention are the same as those of the PFC topology circuit provided in the above embodiments, and other technical features in the electrical device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here. In this embodiment, the power supply device can be integrated into the electrical device or set up independently of the electrical device; no limitation is made here. Optionally, the electrical device of this invention can be an air conditioner, washing machine, refrigerator, or other electrical device with a motor.

[0130] This invention also proposes a control method for a PFC topology circuit, based on the aforementioned PFC topology circuit, with reference to... Figure 12 The control method for the PFC topology circuit includes:

[0131] Step S100: Obtain the AC voltage connected to the PFC topology circuit;

[0132] Step S200: Control the switching module 40 to be turned on or off according to the magnitude of the AC voltage, so that the capacitor charging mode of the bus output module 50 matches the input AC voltage; wherein, when the switching module 40 is turned on, multiple capacitors in the bus output module 50 are charged alternately; when the switching module 40 is turned off, all capacitors in the bus output module 50 are charged.

[0133] In this embodiment, the execution entity of the control method for the PFC topology circuit can be a processor with data processing and program execution functions. When this control method is applied to electrical equipment, the execution entity can be the main controller of the electrical equipment. Both the processor and the main controller can control the switching module 40 to be turned on or off according to the magnitude of the AC voltage, so that the capacitor charging mode of the bus output module 50 matches the input AC voltage to meet the requirements of different voltage systems. Furthermore, it provides a corresponding DC bus voltage according to the load voltage requirements of the electrical equipment, and can also stabilize the DC bus voltage output when the voltage connected to the power input terminal 10 fluctuates.

[0134] It should be noted that the AC voltage can be detected by the aforementioned detection module 60, or it can be input in advance and transmitted through the processor's internal communication circuit. Thus, the processor controls the switching module 40 to be turned on / off based on the magnitude of the AC voltage and the preset voltage threshold, thereby controlling the PFC topology circuit to operate in different working modes.

[0135] In one embodiment, reference Figure 13 The step of controlling the switching module 40 to turn on or off based on the detected AC voltage specifically includes:

[0136] Step S210: When the AC voltage is less than or equal to the first preset voltage threshold, control the switching module 40 to conduct so as to alternately charge the multiple capacitors in the bus output module 50.

[0137] Step S220: When the AC voltage is greater than the second preset voltage threshold, control the switching module 40 to turn off so as to charge all the capacitors in the bus output module 50; wherein, the first preset voltage threshold is less than or equal to the second preset voltage threshold.

[0138] In this embodiment, it is assumed that the first preset voltage threshold is 130V and the second preset voltage threshold is 240V. If the input AC voltage is 100V, the control module 70 controls the switching module 40 to turn on, so as to alternately charge multiple capacitors C1 and C2 in the bus output module 50; if the detection module 60 detects an AC voltage of 300V, the control module 70 controls the switching module 40 to turn off, so as to charge the first capacitor C1 and the second capacitor C2 simultaneously. In this way, the corresponding high-voltage DC bus voltage is output for use by the downstream load. The capacitor charging method includes alternating charging and simultaneous charging. The switching module 40 is controlled to turn on / off according to the relationship between the AC voltage and the first and second preset voltage thresholds, so as to match the capacitor charging method with the input AC voltage.

[0139] It should be noted that when the AC voltage is less than or equal to the first preset voltage threshold AC1, the switching module 40 cooperates with the bridge circuit 30 to rectify and boost the input AC voltage before outputting it to the DC bus BUS. At this time, the voltage output to the DC bus BUS by the bridge circuit 30 and the switching module 40 is n times the voltage independently output by the bridge circuit 30, where n is a real number greater than 0. For example, when n = n1, the LFC topology circuit is in an n1-fold voltage multiplier rectification mode; or, when n = n2, the LFC topology circuit is in an n2-fold voltage multiplier rectification mode; where n2 is greater than n1. In this embodiment, the bus output module 50 has two capacitors, so in this application, n = 2. By alternately charging C1 and C2, the LFC topology circuit is in a 2-fold voltage multiplier rectification mode, achieving voltage boosting. Furthermore, the bridge circuit 30 can be reused; that is, the bridge circuit 30 can function as a PFC circuit to perform AC-DC conversion and power factor correction, thus completing the AC-DC conversion. Simultaneously, the PFC circuit can also perform DC-DC conversion, boosting the input DC voltage and performing power factor correction to complete the DC-DC conversion. In this way, components from both AC and DC PFC circuit topologies can be reused, which helps improve component utilization and reduce costs.

[0140] The control method of the PFC topology circuit of this invention can control the on / off state of the switching module 40 according to the AC voltage, so that the capacitor charging mode of the bus output module 50 matches the input AC voltage. This makes it applicable to a wider range of AC voltages, meets the requirements of different voltage systems, improves the adaptability of the PFC topology circuit, and thus enhances the flexibility and compatibility of the power supply device.

[0141] The above description is only a part of the embodiments of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A PFC topology circuit, characterized in that, The PFC topology circuit includes a power input terminal, an inductor module, a bridge circuit, a bus output module, a switching module, a detection module, and a control module. The inductor module is used to alternately store / release energy as the AC voltage changes within a target cycle. The bridge circuit is used to adjust the direction of the current flowing through the inductor module and to synchronously rectify and output the AC voltage when the inductor module releases energy. The bus output module includes at least two bus capacitors connected in series. The detection module is used to detect the AC voltage input to the power input terminal; The switching module is used to alternately charge multiple capacitors in the bus output module when it is turned on, and to charge all capacitors in the bus output module when it is turned off. The control module is used to control the switching module to turn on or off according to the magnitude of the detected AC voltage, so that the capacitor charging mode of the bus output module matches the input AC voltage.

2. The PFC topology circuit as described in claim 1, characterized in that, The control module is specifically configured to control the switching module to turn on when the detected AC voltage is less than or equal to a first preset voltage threshold, so as to alternately charge multiple capacitors in the bus output module; and to control the switching module to turn off when the detected AC voltage is greater than a second preset voltage threshold, so as to charge all capacitors in the bus output module; wherein the first preset voltage threshold is less than or equal to the second preset voltage threshold.

3. The PFC topology circuit as described in claim 2, characterized in that, The bus output module includes a first bus capacitor and a second bus capacitor; the control module is used to charge the first bus capacitor when the detected AC voltage is less than a first preset voltage threshold and is within the positive half-cycle of the target period of the AC voltage, and to charge the second bus capacitor when the AC voltage is less than the first preset voltage threshold and is within the negative half-cycle of the target period of the AC voltage. And, when the detected AC voltage is greater than a second preset voltage threshold and within one cycle of the target period of the AC voltage, the first bus capacitor and the second bus capacitor are charged.

4. The PFC topology circuit as described in claim 1, characterized in that, The PFC topology circuit also includes a bus voltage detection module, which is used to detect the bus voltage output by the bus output module and output it to the control module; The control module is used to adjust the duty cycle of the switching transistor in the bridge circuit according to the relationship between the bus voltage and the target bus voltage range, so as to adjust the bus voltage to the target bus voltage range.

5. The PFC topology circuit as described in claim 1, characterized in that, The control module is further configured to control the switching module to be turned on during a first preset time period and turned off during a second preset time period when the AC voltage is greater than a first preset voltage threshold and less than or equal to a second preset voltage threshold.

6. The PFC topology circuit as described in claim 2, characterized in that, The bridge circuit includes a first bridge arm and a second bridge arm connected in parallel. The first bridge arm includes a first switch and a second switch connected in series. The second bridge arm includes a third switch and a fourth switch connected in series. The PFC topology circuit includes a first inductor energy storage state and a first capacitor charging state. The control module is specifically used for: If the detected AC voltage is less than or equal to a first preset voltage threshold, the second and fourth switches are turned on, and the first and third switches are turned off; or... The first and third switching transistors are controlled to be turned on, and the second and fourth switching transistors are controlled to be turned off, so that the PFC topology circuit operates in the first inductor energy storage state. And, specifically used for: If the detected AC voltage is less than or equal to a first preset voltage threshold, the first switch and the switching module are turned on, and the second, third, and fourth switches are turned off, or... The second switch and the switching module are turned on, and the first, third, and fourth switches are turned off, so that the PFC topology circuit operates in the first capacitor charging state.

7. The PFC topology circuit as described in claim 2, characterized in that, The bridge circuit includes a first bridge arm and a second bridge arm connected in parallel. The first bridge arm includes a first switch and a second switch connected in series. The second bridge arm includes a third switch and a fourth switch connected in series. The PFC topology circuit includes a second inductor energy storage state and a second capacitor charging state. The control module is specifically used for: If the detected AC voltage is greater than the second preset voltage threshold, control the second and fourth switches to turn on, and control the first and third switches to turn off, or... The first and third switching transistors are controlled to be turned on, and the second and fourth switching transistors are controlled to be turned off, so that the PFC topology circuit operates in the second inductor energy storage state. And, specifically used for: If the detected AC voltage is greater than the second preset voltage threshold, control the first and fourth switches to turn on, and control the second and third switches to turn off, or... The second and third switches are controlled to be turned on, and the first and fourth switches are controlled to be turned off, so that the PFC topology circuit operates in the second capacitor charging state.

8. The PFC topology circuit as described in any one of claims 1-7, characterized in that, The control module is also configured to control the switching module to turn off during the initial power-on phase of the load, and to obtain the operating frequency of the load; and to determine the target bus voltage corresponding to the load based on the operating frequency of the load.

9. The PFC topology circuit as described in any one of claims 1-7, characterized in that, The bridge circuit includes a first bridge arm and a second bridge arm connected in parallel. The first bridge arm includes a first switch and a second switch connected in series. The second bridge arm includes a third switch and a fourth switch connected in series. The first end of the inductor module is connected to one end of the power input terminal. The second end of the inductor module is connected to the common terminal of the first and second switches. The other end of the power input terminal is connected to the common terminal of the third and fourth switches. The bus output module is connected in parallel with the output terminal of the bridge circuit. The first end of the switching module is connected to the common terminal of the third and fourth switches. The second end of the switching module is connected to the bus output module.

10. The PFC topology circuit as described in any one of claims 1-7, characterized in that, The switching module includes a fifth switching transistor and a sixth switching transistor. The first end of the fifth switching transistor is connected to one end of the power input terminal, the second end of the fifth switching transistor is connected to the first end of the sixth switching transistor, and the second end of the sixth switching transistor is connected to the bus output module.

11. A power supply device, characterized in that, The power supply device includes the PFC topology circuit as described in any one of claims 1 to 10.

12. An electrical appliance, characterized in that, The electrical device includes the PFC topology circuit as described in any one of claims 1 to 10; And / or, including the power supply device as described in claim 11.

13. A control method for a PFC topology circuit, characterized in that, Based on the PFC topology circuit according to any one of claims 1 to 10, the control method of the PFC topology circuit includes: Obtain the AC voltage connected to the PFC topology circuit; The switching module is turned on or off according to the magnitude of the AC voltage, so that the capacitor charging mode of the bus output module matches the input AC voltage; wherein, when the switching module is on, multiple capacitors in the bus output module are charged alternately; when the switching module is off, all capacitors in the bus output module are charged.

14. The control method for the PFC topology circuit as described in claim 13, characterized in that, The step of controlling the switching module to turn on or off based on the detected AC voltage specifically includes: When the AC voltage is less than or equal to the first preset voltage threshold, the switching module is turned on to alternately charge multiple capacitors in the bus output module. When the AC voltage is greater than the second preset voltage threshold, the switching module is controlled to turn off in order to charge all the capacitors in the bus output module; wherein, the first preset voltage threshold is less than or equal to the second preset voltage threshold.

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