Bridgeless PFC circuit structure and power supply equipment

Abstract

The utility model relates to a bridgeless PFC circuit structure and a power supply device. The circuit comprises a first switch tube, a first energy storage inductor, a first EC charging module, a second EC charging module and a charging control module. One end of the first energy storage inductor is connected with a live wire end of power supply equipment, one end of the first EC charging module and one end of the second EC charging module, and the other end of the first energy storage inductor is connected with a first pole of the first switch tube, the other end of the first EC charging module and the other end of the second EC charging module; the second pole of the first switching tube is connected with the zero line end of the power supply equipment; the charging control module is connected with the third pole of the first switch tube, the first EC charging module and the second EC charging module, and controls the first switch tube, the first EC charging module and the second EC charging module to be connected or disconnected. The circuit loss caused by the rectifier bridge is reduced, the circuit working efficiency is improved, and the circuit size is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to charging circuit field, in particular to a kind of bridgeless PFC circuit structure and power supply equipment. BACKGROUND

[0002] With the application popularization of gallium nitride, charger volume is smaller and smaller, but charging efficiency requirement is higher and higher, and the volume of circuit component is required smaller and smaller.In traditional charging circuit, rectifier bridge is combined with PFC (Power Factor Correction, power factor correction) circuit, but the circuit loss of rectifier bridge is very big, and volume occupation is high, which is not conducive to charger small size and high efficient operation. SUMMARY

[0003] Therefore, it is necessary to provide a bridgeless PFC circuit structure and power supply equipment to solve the problems of low efficiency and large volume of charging circuit.

[0004] In the first aspect, the utility model embodiment provides a bridgeless PFC circuit structure, which comprises a first switch tube, a first energy storage inductor, a first EC charging module, a second EC charging module and a charging control module.

[0005] The first pole of the first switch tube is connected in series with the first energy storage inductor, and the second pole of the first switch tube is connected with the live wire end or the zero line end of the power supply equipment; one end of the first energy storage inductor is connected with the live wire end of the power supply equipment, one end of the first EC charging module and one end of the second EC charging module, and the other end of the first energy storage inductor is connected with the other end of the first EC charging module and the other end of the second EC charging module.

[0006] The charging control module is connected with the third pole of the first switch tube, the first EC charging module and the second EC charging module respectively, and controls the conduction or cut-off of the first switch tube, the first EC charging module and the second EC charging module.

[0007] In some embodiments, the first EC charging module comprises a first diode and a first EC, the second EC charging module comprises a second diode and a second EC, and the first EC charging module or the second EC charging module further comprises a second switch tube.

[0008] One end of the first energy storage inductor is connected with the live wire end and the first electrode of the second switch tube, the other end of the first energy storage inductor is connected with the anode of the first diode and the cathode of the second diode, the cathode of the first diode is connected with one end of the first EC, the other end of the first EC is connected with the second electrode of the second switch tube and one end of the second EC, the other end of the second EC is connected with the anode of the second diode; the third electrode of the second switch tube is connected with the charging control module.

[0009] In some embodiments, the first EC charging module comprises a third switch tube and a first EC, and the second EC charging module comprises a fourth switch tube and a second EC.

[0010] One end of the first energy storage inductor is connected with the zero line end, the first electrode of the third switch tube and the first electrode of the fourth switch tube, the second electrode of the third switch tube is connected with one end of the first EC, the second electrode of the fourth switch tube is connected with the other end of the second EC; the other end of the first energy storage inductor is connected with the live wire end, the other end of the first EC and one end of the second EC; the third electrode of the third switch tube and the third electrode of the fourth switch tube are connected with the charging control module.

[0011] In some embodiments, a fifth switch tube, a third diode, a fourth diode and a second energy storage inductor are further included; the first EC charging module comprises a first diode and a first EC, and the second EC charging module comprises a second diode and a second EC.

[0012] One end of the first energy storage inductor is connected with the live wire end, the other end of the first EC and one end of the second EC, the other end of the first energy storage inductor is connected with the anode of the first diode and the cathode of the second diode, the cathode of the first diode is connected with one end of the first EC, the anode of the second diode is connected with the other end of the second EC;

[0013] The first electrode of the fifth switch tube is connected in series with the second energy storage inductor, the second electrode of the fifth switch tube is connected with the live wire end or the zero line end of the power supply device; one end of the second energy storage inductor is connected with the live wire end, the other end of the first EC and one end of the second EC, the other end of the second energy storage inductor is connected with the anode of the third diode and the cathode of the fourth diode, the cathode of the third diode is connected with one end of the first EC, the anode of the fourth diode is connected with the other end of the second EC; the third electrode of the fifth switch tube is connected with the charging control module.

[0014] In some embodiments, one end of the first EC and the other end of the second EC are further connected with a load.

[0015] In some embodiments, the load comprises a first load and a second load, the first load is connected in series with the second load, the first load is connected in parallel with the first EC, and the second load is connected in parallel with the second EC.

[0016] In some embodiments, the EMI circuit module comprises a bidirectional breakdown diode, a first capacitor, a second capacitor, a first transformer and a second transformer.

[0017] One end of the bidirectional breakdown diode is connected with the live wire end, the other end of the bidirectional breakdown diode is connected with the neutral wire end, the bidirectional breakdown diode, the first capacitor, the first transformer, the second capacitor and the second transformer are connected in parallel in sequence, one end of a side winding of the second transformer is connected with one end of the first energy storage inductor, and one end of the other side winding of the second transformer is connected with the second electrode of the first switch tube.

[0018] In some embodiments, a fuse is further connected between one end of the bidirectional breakdown diode and the live wire end, and / or a thermistor is further connected between the other end of the bidirectional breakdown diode and the neutral wire end.

[0019] In some embodiments, the charging control module is a PWM controller.

[0020] In the second aspect, the utility model provides a kind of power supply equipment, including the bridgeless PFC circuit structure as described in the first aspect.

[0021] Compared with prior art, the utility model at least has the following beneficial effects:

[0022] The utility model only needs first switch tube and EC charging module using diode or switch tube to cooperate with charging control module, to realize bridgeless PFC circuit, reduce the circuit loss caused by rectifier bridge, improve circuit working effect;While the circuit structure of the utility model does not need rectifier bridge, can be realized with least 1 switch tube, less than the 4 switch tubes required by totem column PFC circuit, can effectively reduce the circuit volume of power supply product, meet charger small size demand.

[0023] The utility model can limit the charging current of first EC and second EC through high-frequency switching of first switch tube and second switch tube when capacitor has no electric quantity in power-on instant, to inhibit inrush current, protect circuit structure.

[0024] The utility model discloses a combination EMI circuit module, can reduce circuit electromagnetic interference, improve the working stability of PFC circuit. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A circuit structure schematic diagram of the bridgeless PFC circuit structure is shown in the utility model embodiment.

[0026] Figure 2 Another circuit structure schematic diagram of the bridgeless PFC circuit structure is shown in the utility model embodiment.

[0027] Figure 3 The circuit principle diagram of the bridgeless PFC circuit structure is shown in the first utility model embodiment.

[0028] Figure 4 The circuit principle diagram of the bridgeless PFC circuit structure is shown in the second utility model embodiment.

[0029] Figure 5 The circuit principle diagram of the bridgeless PFC circuit structure is shown in the third utility model embodiment.

[0030] Figure 6 The circuit principle diagram of the bridgeless PFC circuit structure is shown in the fourth utility model embodiment.

[0031] Figure 7 The circuit principle diagram of the bridgeless PFC circuit structure is shown in the fifth utility model embodiment. DETAILED DESCRIPTION

[0032] In order to make the above objects, features and advantages of the utility model more apparent, below, specific embodiments of the utility model are described in detail with the drawings. In the following description, a lot of specific details are set forth in order to give a full understanding of the utility model. But the utility model can be implemented in many other ways different from the description, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.

[0033] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are used for illustration only and do not limit the orientation of the utility model.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] Referring to Figure 1 Or Figure 2 The circuit structure schematic diagram of the bridgeless PFC circuit structure provided in the embodiment of the application comprises a first switch tube Q1, a first energy storage inductor L1, a first EC charging module 11, a second EC charging module 12 and a charging control module 13.

[0036] The first pole of the first switch tube Q1 is connected in series with the first energy storage inductor L1, and the second pole of the first switch tube Q1 is connected with the live wire end L or the neutral wire end N of the power supply device; one end of the first energy storage inductor L1 is connected with the live wire end L of the power supply device, one end of the first EC charging module 11 and one end of the second EC charging module 12, and the other end of the first energy storage inductor L1 is connected with the other end of the first EC charging module 11 and the other end of the second EC charging module 12.

[0037] The charging control module 13 is connected with the third pole of the first switch tube Q1, the first EC charging module 11 and the second EC charging module 12 respectively, and controls the conduction or cut-off of the first switch tube Q1, the first EC charging module 11 and the second EC charging module 12.

[0038] In the embodiment, the switch tube comprises a silicon MOS tube, a gallium nitride, a silicon carbide or an IGBT switch device. The first switch tube Q1 can be connected in series between the live wire end L and the first energy storage inductor L1, or can be connected in series between the neutral wire end and the first energy storage inductor L1. The charging control module 13 sends corresponding level signals to the first switch tube Q1, the first EC charging module 11 and the second EC charging module 12, so as to control the conduction and cut-off of the first switch tube Q1, the first EC charging module 11 and the second EC charging module 12. When the first switch tube Q1 is conducted, if it is an AC positive half cycle, the current enters from the live wire end L, passes through the first energy storage inductor L1 and the first switch tube Q1, and returns to the neutral wire end N, at this time, the first energy storage inductor L performs energy storage, and forms a left negative and right positive electromotive force. When the first energy storage inductor L completes energy storage, Q1 is cut off, the first EC charging module 11 is controlled to be conducted and the second EC charging module 12 is controlled to be cut off, the electromotive force of the first energy storage inductor L1 reverses to left positive and right negative, and the first energy storage inductor L1 releases electric energy to charge the first EC charging module 11.

[0039] When the first switch Q1 is turned on, if it is the negative half cycle of the alternating current, the current enters from the neutral line N, passes through the first switch Q1 and the first energy storage inductor L1, and returns to the live line L. At this time, the first energy storage inductor L1 stores energy and forms a left positive and right negative electromotive force. When the first energy storage inductor L1 completes the energy storage, Q1 is turned off, the first EC charging module 11 is turned off and the second EC charging module 12 is turned on, and the electromotive force of the first EC charging module 11 is reversed to left negative and right positive. The first energy storage inductor L1 releases energy to charge the second EC charging module 12.

[0040] The first switch Q1 of the embodiment repeatedly performs circuit conduction and cutoff operations in the positive half cycle or negative half cycle of the alternating current to control the energy storage and release of the first energy storage inductor L1, and charges the first EC charging module 11 in the positive half cycle of the alternating current and charges the second EC charging module 12 in the negative half cycle. Compared with the traditional rectifier bridge + PFC circuit structure, the embodiment eliminates the rectifier bridge and requires fewer switch elements, thereby improving the working efficiency of the circuit, reducing the size of the circuit, and reducing the cost.

[0041] In some embodiments, as shown in Figure 3 The first EC charging module 11 includes a first diode D1 and a first EC (EC1), the second EC charging module 12 includes a second diode D2 and a second EC (EC2), and the first EC charging module 11 or the second EC charging module 12 further includes a second switch Q2.

[0042] One end of the first energy storage inductor L1 is connected with the live line L and the first pole of the second switch Q2, the other end of the first energy storage inductor L1 is connected with the anode of the first diode D1 and the cathode of the second diode D2, the cathode of the first diode D1 is connected with one end of the first EC, the other end of the first EC is connected with the second pole of the second switch Q2 and one end of the second EC, the other end of the second EC is connected with the anode of the second diode D2, and the third pole of the second switch Q2 is connected with the charging control module 13.

[0043] In the embodiment, when the positive half cycle of the alternating current, the current enters from the live wire end L, the first switch tube Q1 and the second switch tube Q2 are alternately turned on, the first energy storage inductor L1 stores energy and releases energy to charge the first EC, specifically: when the first switch tube Q1 is turned on, the current passes through the first energy storage inductor L1 and the first switch tube Q1 to return to the neutral wire end N, at this time, the first energy storage inductor L1 stores energy, and forms a left negative and right positive electromotive force. After the first energy storage inductor L1 completes the energy storage, the first switch tube Q1 is cut off, the second switch tube Q2 is turned on, the electromotive force in the first energy storage inductor L1 is reversed, forming a left positive and right negative electromotive force, and at this time, the first diode D1 is forwardly conducted, and the second diode D2 is reversely cut off, forming a loop of the first diode D1, the EC1 and the second switch tube Q2, and the first energy storage inductor L1 releases energy to charge the EC1.

[0044] When the negative half cycle of the alternating current, the current enters from the neutral wire end N, the first switch tube Q1 and the second switch tube Q2 are alternately turned on, the first energy storage inductor L1 stores energy and releases energy to charge the first EC, specifically: when the first switch tube Q1 is turned on, the current passes through the first switch tube Q1 and the first energy storage inductor L1 to return to the live wire end L, at this time, the first energy storage inductor L1 stores energy, and forms a left positive and right negative electromotive force. After the first energy storage inductor L1 completes the energy storage, the first switch tube Q1 is cut off, the second switch tube Q2 is turned on, the electromotive force in the first energy storage inductor L1 is reversed, forming a left positive and right negative electromotive force, and at this time, the first diode D1 is reversely cut off, and the second diode D2 is forwardly conducted, forming a loop of the second switch tube Q2, the EC2 and the second diode D2, and the first energy storage inductor L1 releases energy to charge the EC2.

[0045] The first switch tube Q1 and the second switch tube Q2 of the embodiment repeatedly perform the turn-on and cut-off operation in the positive half cycle or the negative half cycle of the alternating current, so that the first energy storage inductor L1 stores energy and releases energy, respectively charges the EC1 in the positive half cycle of the alternating current and charges the EC2 in the negative half cycle of the alternating current, and the two capacitors are alternately charged according to the alternating current input frequency. Alternatively, the output mode can be a double voltage output of the two capacitors in series, or the EC1 can be charged while the EC2 is output, the EC2 can be charged while the EC1 is output, and the two capacitors are alternately charged and output.

[0046] Alternatively, the charging control module is a PWM controller. The first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4 and the fifth switch tube Q5 are connected with the PWM controller, and the PWM controller controls the turn-on or cut-off of the switch tube by sending a high level or a low level to the switch tube.

[0047] In some embodiments, as Figure 4As shown, the first EC charging module 11 includes a third switch Q3 and a first EC, and the second EC charging module 12 includes a fourth switch Q4 and a second EC.

[0048] One end of the first energy storage inductor L1 is connected to the neutral terminal N, the first terminal of the third switch Q3, and the first terminal of the fourth switch Q4. The second terminal of the third switch Q3 is connected to one end of the first EC, and the second terminal of the fourth switch Q4 is connected to the other end of the second EC. The other end of the first energy storage inductor L1 is connected to the live terminal L, the other end of the first EC, and one end of the second EC. The third terminals of the third switch Q3 and the fourth switch Q4 are connected to the charging control module 13.

[0049] In this embodiment, the first energy storage inductor L1 is charged by controlling the on and off states of the third switch Q3 and the fourth switch Q3. This embodiment uses two switches instead of one. Figure 3 The two diodes and one switching transistor in the embodiment also achieve efficient circuit operation and miniaturization.

[0050] In some embodiments, such as Figure 5 As shown, it also includes a fifth switch Q5, a third diode D3, a fourth diode D4, and a second energy storage inductor L2; the first EC charging module 11 includes a first diode D1 and a first EC, and the second EC charging module 12 includes a second diode D2 and a second EC.

[0051] One end of the first energy storage inductor L1 is connected to the live wire L, the other end of the first EC, and one end of the second EC. The other end of the first energy storage inductor L1 is connected to the positive terminal of the first diode D1 and the negative terminal of the second diode D2. The negative terminal of the first diode D1 is connected to one end of the first EC, and the positive terminal of the second diode D2 is connected to the other end of the second EC.

[0052] The first terminal of the fifth switching transistor Q5 is connected in series with the second energy storage inductor L2, and the second terminal of the fifth switching transistor Q5 is connected to the live wire L or the neutral wire N of the power supply device; one end of the second energy storage inductor L2 is connected to the live wire L, and the other end of the second energy storage inductor L2 is connected to the other end of the first EC and one end of the second EC; the other end of the second energy storage inductor L2 is connected to the anode of the third diode D3 and the cathode of the fourth diode D4; the cathode of the third diode D3 is connected to one end of the first EC, and the anode of the fourth diode D4 is connected to the other end of the second EC; the third terminal of the fifth switching transistor Q5 is connected to the charging control module 13.

[0053] In the embodiment, the fifth switch tube Q5, the third diode D3, the fourth diode D4 and the second energy storage inductor L2 are arranged to select more energy storage inductors for charging operation.

[0054] In some embodiments, one end of the first EC and the other end of the second EC are further connected with a load RL. Optionally, as shown in the figure, the load includes a first load RL1 and a second load RL2, the first load RL1 is connected in series with the second load RL2, the first load RL1 is connected in parallel with the first EC, and the second load RL2 is connected in parallel with the second EC. Figure 6

[0055] In the embodiment, the load is connected in parallel with the first EC and the second EC to supply power to the load while charging the EC1 and the EC2, which meets the application requirement of charging the edge while storing energy, such as earphone charging bin.

[0056] In some embodiments, as shown in the figure, the EMI circuit module further includes a bidirectional breakdown diode MOV, a first capacitor CX1, a second capacitor CX2, a first transformer LF1 and a second transformer LF2. Figure 7

[0057] One end of the bidirectional breakdown diode MOV is connected with the live wire end L, and the other end of the bidirectional breakdown diode MOV is connected with the neutral wire end N. The bidirectional breakdown diode MOV, the first capacitor CX1, the first transformer LF1, the second capacitor CX2 and the second transformer LF2 are connected in parallel in sequence. One end of one side winding of the second transformer LF2 is connected with one end of the first energy storage inductor L1, and one end of the other side winding of the second transformer LF2 is connected with the second electrode of the first switch tube Q1.

[0058] In the embodiment, the EMI circuit module is arranged to suppress electromagnetic interference, ensure that the electromagnetic compatibility (EMC) of the power supply meets the standard, and avoid interfering with other electronic devices. Specifically, the EMI circuit filters out various interference signals from the power grid, prevents high-frequency interference formed by the power supply switching circuit from entering the power grid, and thus protects the device from external electromagnetic interference.

[0059] Optionally, a fuse F1 is further connected between one end of the bidirectional breakdown diode MOV and the live wire end L, and / or a thermistor NTC1 is further connected between the other end of the bidirectional breakdown diode MOV and the neutral wire end N, so as to protect the circuit structure.

[0060] ​​In a second aspect, the utility model provides a kind of power supply equipment, including the bridgeless PFC circuit structure as described in first aspect.Power supply equipment can be power adapter, charger, PC power, photovoltaic and inverter etc., meet the device application demand of rectification and boost scene.

[0061] The technical features of the above-described embodiments can be combined arbitrarily, to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combination of these technical features does not exist contradictory, it should be considered as the scope of the present application.

[0062] The above-described embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it should not be understood as the limitation of the scope of the utility model patent.There should be noted that, for ordinary skilled person in the art, without departing from the concept of the utility model, a number of variations and improvements can be made, which belong to the protection scope of the utility model.Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A bridgeless PFC circuit structure, characterized in that, It includes a first switching transistor, a first energy storage inductor, a first EC charging module, a second EC charging module, and a charging control module; The first terminal of the first switching transistor is connected in series with the first energy storage inductor, and the second terminal of the first switching transistor is connected to the live wire or neutral wire of the power supply device; one end of the first energy storage inductor is connected to the live wire of the power supply device, one end of the first EC charging module and one end of the second EC charging module, and the other end of the first energy storage inductor is connected to the other end of the first EC charging module and the other end of the second EC charging module. The charging control module is connected to the third terminal of the first switching transistor, the first EC charging module, and the second EC charging module, respectively, and controls the first switching transistor, the first EC charging module, and the second EC charging module to be turned on or off.

2. The bridgeless PFC circuit structure according to claim 1, characterized in that, The first EC charging module includes a first diode and a first EC, the second EC charging module includes a second diode and a second EC, and the first EC charging module or the second EC charging module further includes a second switching transistor; One end of the first energy storage inductor is connected to the live wire and the first terminal of the second switching transistor. The other end of the first energy storage inductor is connected to the anode of the first diode and the cathode of the second diode. The cathode of the first diode is connected to one end of the first EC. The other end of the first EC is connected to the second terminal of the second switching transistor and one end of the second EC. The other end of the second EC is connected to the anode of the second diode. The third terminal of the second switching transistor is connected to the charging control module.

3. The bridgeless PFC circuit structure according to claim 1, characterized in that, The first EC charging module includes a third switch and a first EC, and the second EC charging module includes a fourth switch and a second EC; One end of the first energy storage inductor is connected to the neutral wire, the first terminal of the third switch, and the first terminal of the fourth switch. The second terminal of the third switch is connected to one end of the first EC, and the second terminal of the fourth switch is connected to the other end of the second EC. The other end of the first energy storage inductor is connected to the live wire, the other end of the first EC, and one end of the second EC. The third terminals of the third and fourth switches are connected to the charging control module.

4. The bridgeless PFC circuit structure according to claim 1, characterized in that, It also includes a fifth switching transistor, a third diode, a fourth diode, and a second energy storage inductor; the first EC charging module includes a first diode and a first EC, and the second EC charging module includes a second diode and a second EC; One end of the first energy storage inductor is connected to the live wire, the other end of the first EC, and one end of the second EC. The other end of the first energy storage inductor is connected to the anode of the first diode and the cathode of the second diode. The cathode of the first diode is connected to one end of the first EC, and the anode of the second diode is connected to the other end of the second EC. The first terminal of the fifth switching transistor is connected in series with the second energy storage inductor, and the second terminal of the fifth switching transistor is connected to the live wire or neutral wire of the power supply device; one path of one end of the second energy storage inductor is connected to the live wire, and the other path of one end of the second energy storage inductor is connected to the other end of the first EC and one end of the second EC; the other end of the second energy storage inductor is connected to the anode of the third diode and the cathode of the fourth diode; the cathode of the third diode is connected to one end of the first EC, and the anode of the fourth diode is connected to the other end of the second EC; the third terminal of the fifth switching transistor is connected to the charging control module.

5. The bridgeless PFC circuit structure according to any one of claims 2 to 4, characterized in that, One end of the first EC and the other end of the second EC are also connected to loads.

6. The bridgeless PFC circuit structure according to claim 5, characterized in that, The load includes a first load and a second load, the first load and the second load are connected in series, the first load is connected in parallel with the first EC, and the second load is connected in parallel with the second EC.

7. The bridgeless PFC circuit structure according to claim 1, characterized in that, It also includes an EMI circuit module, which includes a bidirectional breakdown diode, a first capacitor, a second capacitor, a first transformer, and a second transformer. One end of the bidirectional breakdown diode is connected to the live wire, and the other end of the bidirectional breakdown diode is connected to the neutral wire. The bidirectional breakdown diode, the first capacitor, the first transformer, the second capacitor, and the second transformer are connected in parallel in sequence. One end of one winding of the second transformer is connected to one end of the first energy storage inductor, and one end of the other winding of the second transformer is connected to the second pole of the first switching transistor.

8. The bridgeless PFC circuit structure according to claim 7, characterized in that, A fuse is also connected between one end of the bidirectional breakdown diode and the live wire; and / or, a thermistor is also connected between the other end of the bidirectional breakdown diode and the neutral wire.

9. The bridgeless PFC circuit structure according to claim 1, characterized in that, The charging control module is a PWM controller.

10. A power supply device, characterized in that, Includes the bridgeless PFC circuit structure as described in any one of claims 1 to 9.

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