A symmetrical charge pump high power factor AC / DC converter

Abstract

This invention discloses a symmetrical charge pump high power factor AC / DC converter in the field of power electronics technology, including an input AC power supply (Vs), an input filter inductor (L1), an input filter capacitor (C1), a power frequency rectifier bridge (D1-D4), and a symmetrical charge pump high power factor half-bridge converter. The input AC power supply (Vs) is filtered by the input filter inductor (L1) and the input filter capacitor (C1) to remove high-frequency ripple before being rectified into a full-wave waveform by the power frequency rectifier bridge (D1-D4). The rectified full-wave waveform is then input to the symmetrical charge pump high power factor half-bridge converter. This invention combines a symmetrical high-frequency charge pump circuit with a half-bridge DC / DC converter to form a single-stage high power factor half-bridge DC / DC converter, reducing the harmonic components at the AC input of the half-bridge AC / DC converter, improving the power factor, and having the characteristics of low cost.

Description

Technical Field

[0001] This invention relates to a power factor converter, and more particularly to a symmetrical charge pump high power factor AC / DC converter, belonging to the field of power electronics technology. Background Technology

[0002] AC / DC converters are widely used, but ordinary AC / DC converters typically use diode rectification and filtering at the input, resulting in high harmonic content and low power factor at the AC input. To overcome these shortcomings, the industry commonly uses a two-stage solution, with power factor correction (PFC) technology in the first stage and a DC / DC converter in the second stage. While the two-stage approach solves the low power factor problem, the increased number of stages leads to higher costs, more power components, decreased efficiency, and reduced reliability.

[0003] Compared to active power factor correction circuits, high-frequency charge pump power factor correction technology uses a charge pump capacitor and a high-frequency AC source to achieve PFC, resulting in a simpler circuit structure, lower cost, and no need for complex control circuits. Summary of the Invention

[0004] The purpose of this invention is to provide a symmetrical charge pump high power factor AC / DC converter. It combines a symmetrical high-frequency charge pump circuit with a half-bridge DC / DC converter to form a single-stage high power factor half-bridge DC / DC converter, which reduces the harmonic components at the AC input of the half-bridge AC / DC converter, improves the power factor, and has the characteristics of low cost.

[0005] The objective of this invention is achieved as follows: a symmetrical charge pump high power factor AC / DC converter, comprising an input AC power supply (Vs), an input filter inductor (L1), an input filter capacitor (C1), a power frequency rectifier bridge (D1-D4), and a symmetrical charge pump high power factor half-bridge converter.

[0006] The symmetrical charge pump high power factor half-bridge converter includes: a second inductor (L2), a second capacitor (C2), a fourth capacitor (C4), a fifth diode (D5), a seventh diode (D7), a third inductor (L3), a third capacitor (C3), a fifth capacitor (C5), a sixth diode (D6), an eighth diode (D8), a sixth capacitor (C6), a first power switch (M1), a thirteenth diode (D13), a second power switch (M2), a fourteenth diode (D14), a seventh capacitor (C7), an eighth capacitor (C8), a transformer (TL1), a high-frequency rectifier bridge (D9-D12), a fourth inductor (L4), a ninth capacitor (C9), and a load (R);

[0007] The input AC power supply (Vs) is filtered by the input filter inductor (L1) and the input filter capacitor (C1) to remove high-frequency ripple before being sent to the power frequency rectifier bridge (D1-D4) to be rectified into a full-wave waveform. The rectified full-wave waveform is then input to the symmetrical charge pump high power factor half-bridge converter.

[0008] As a further limitation of the present invention, one end of the input filter inductor (L1) is connected to the positive terminal of the AC power supply (Vs), and the other end of the input filter inductor (L1) is connected to the input filter capacitor (C1), the anode of the first diode (D1), and the cathode of the second diode (D2); the other end of the filter capacitor (C1) is connected to the anode of the third diode (D3), the cathode of the fourth diode (D4), and the negative terminal of the input AC power supply (Vs).

[0009] As a further limitation of the present invention, one end of the second inductor (L2) is connected to the cathode of the first diode (D1) and the cathode of the third diode (D3); the other end of the second inductor (L2) is connected to the anode of the fifth diode (D5), the cathode of the seventh diode (D7), one end of the second capacitor (C2), and one end of the fourth capacitor (C4); the other end of the second capacitor (C2) is connected to one end of the third capacitor (C3), the anode of the seventh diode (D7), the cathode of the eighth diode (D8), and one end of the third inductor (L3); the third capacitor (C3) The other end of the capacitor is connected to the anode of the eighth diode (D8), the anode of the second diode (D2), the anode of the fourth diode (D4), the cathode of the sixth diode (D6), and one end of the fifth capacitor (C5); the other end of the fourth capacitor (C4) is connected to the cathode of the fifth diode (D5), one end of the sixth capacitor (C6), one end of the seventh capacitor (C7), the drain of the first power switch (M1), and the cathode of the thirteenth diode (D13); the other end of the sixth capacitor (C6) is connected to the anode of the sixth diode (D6), the anode of the fourteenth diode (D14), and... The other end of the fifth capacitor (C5), one end of the eighth capacitor (C8), and the source of the second power switch (M2) are connected; the other end of the third inductor (L3) is connected to the source of the first power switch (M1), the drain of the second power switch (M2), the anode of the thirteenth diode (D13), the cathode of the fourteenth diode (D14), and the second terminal of the transformer (TL1); the other end of the seventh capacitor (C7) is connected to the other end of the eighth capacitor (C8) and the first terminal of the transformer T; the third terminal of the transformer T is connected to the anode of the ninth diode (D9). The cathode of the tenth diode (D10) is connected; terminal ④ of transformer T is connected to the anode of the eleventh diode (D11) and the cathode of the twelfth diode (D12); one end of the fourth inductor (L4) is connected to the cathode of the ninth diode (D9) and the cathode of the eleventh diode (D11); the other end of the fourth inductor (L4) is connected to one end of the ninth capacitor (C9) and one end of the load resistor (R); the other end of the ninth capacitor (C9) is connected to the anode of the tenth diode (D10), the anode of the twelfth diode (D12) and the other end of the load resistor (R).

[0010] As a further limitation of the present invention, the thirteenth diode (D13) may be an anti-parallel diode or a body diode of the first power switch (M1); the fourteenth diode (D14) may be an anti-parallel diode or a body diode of the second power switch (M2).

[0011] As a further limitation of the present invention, the sixth capacitor (C6) is a DC bus capacitor, and the capacitance of the sixth capacitor (C6) is greater than that of the second capacitor (C2), the third capacitor (C3), the fourth capacitor (C4) and the fifth capacitor (C5).

[0012] As a further limitation of the present invention, the converter employs pulse frequency control.

[0013] As a further limitation of the present invention, the input filter inductor (L1), input filter capacitor (C1), power frequency rectifier bridge (D1-D4), second inductor (L2), second capacitor (C2), third capacitor (C3), fourth capacitor (C4), fifth capacitor (C5), sixth capacitor (C6), first power switch (M1), second power switch (M2), fifth diode (D5), sixth diode (D6), seventh diode (D7), eighth diode (D8), thirteenth diode (D13), and fourteenth diode (D14) constitute a symmetrical charge pump high power factor correction circuit.

[0014] As a further limitation of the present invention, the third inductor (L3), the second capacitor (C2), and the third capacitor (C3) constitute the resonant branch in the high power factor correction circuit of the symmetrical charge pump, and C2=C3; the fourth capacitor (C4) and the fifth capacitor (C5) constitute the charge pump capacitor in the high power factor correction circuit of the symmetrical charge pump, and C4=C5.

[0015] As a further limitation of the present invention, the seventh diode (D7) and the eighth diode (D8) are clamping diodes in a power factor correction circuit.

[0016] Compared with existing technologies, the advantages of this invention are as follows: This invention achieves a high power factor and reduces harmonic interference by introducing symmetrical high-frequency charge pump technology into a traditional half-bridge DC / DC converter, ensuring that the device's harmonics and power factor meet relevant national standards. Due to the symmetrical charge pump structure, the frequency of the ripple current through the second inductor is doubled, resulting in a smaller ripple current while maintaining the inductance value. Since the symmetrical high-frequency charge pump circuit does not require additional power switches and only uses small high-frequency inductors and capacitors, the entire device requires minimal additional cost and size. Compared with two-stage circuit schemes, it maintains good performance while offering higher economic and social benefits. This invention can be used in electronic devices in industries such as industrial, communication, and home appliances where DC power is required. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall topology of the present invention.

[0018] Figure 2 This is a schematic diagram of the operating waveform (simulation) of the topology circuit of the present invention.

[0019] Figure 3 This is a schematic diagram of the operation before topology mode t0 of the present invention.

[0020] Figure 4This is a schematic diagram of the working topology mode t0-t1 of the present invention.

[0021] Figure 5 This is a schematic diagram of the operation of the topology mode t1-t2 of the present invention.

[0022] Figure 6 This is a schematic diagram of the operation of the topology mode t2-t3 of the present invention.

[0023] Figure 7 This is a schematic diagram of the operation of the topology modes t3-t4 of the present invention.

[0024] Figure 8 The results are simulation results of this invention. Detailed Implementation

[0025] To further illustrate the content and features of the present invention, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] The technical concept of this invention is to combine symmetrical high-frequency charge pump technology with a half-bridge DC / DC converter, using two charge pump circuits with the same structure to form a symmetrical charge pump circuit. The power switch in the half-bridge DC / DC converter is also used in the symmetrical high-frequency charge pump circuit, thus forming a symmetrical charge pump AC / DC converter.

[0027] The present invention is described in detail below:

[0028] like Figure 1 As shown, the present invention comprises: an input AC power supply (Vs), an input filter inductor (L1), an input filter capacitor (C1), a power frequency rectifier bridge (D1-D4), a second inductor (L2), a second capacitor (C2), a fourth capacitor (C4), a fifth diode (D5), a seventh diode (D7), a third inductor (L3), a third capacitor (C3), a fifth capacitor (C5), a sixth diode (D6), an eighth diode (D8), a sixth capacitor (C6), a first power switch (M1), a thirteenth diode (D13), a second power switch (M2), a fourteenth diode (D14), a seventh capacitor (C7), an eighth capacitor (C8), a transformer (TL1), a high-frequency rectifier bridge (D9-D12), a fourth inductor (L4), a ninth capacitor (C9), and a load (R), forming a symmetrical charge pump AC / DC converter.

[0029] Its main technical principle is as follows: The input AC power supply (Vs) is connected in sequence to the input filter inductor (L1), the input filter capacitor (C1), the power frequency rectifier bridge (D1-D4), the second inductor (L2), the second capacitor (C2), the fourth capacitor (C4), the fifth diode (D5), the seventh diode (D7), the third inductor (L3), the third capacitor (C3), the fifth capacitor (C5), the sixth diode (D6), the eighth diode (D8), the sixth capacitor (C6), the first power switch (M1), the thirteenth diode (D13), the second power switch (M2), the fourteenth diode (D14), the seventh capacitor (C7), the eighth capacitor (C8), the transformer (TL1), the high-frequency rectifier bridge (D9-D12), the fourth inductor (L4), the ninth capacitor (C9), and the load (R). The input AC power supply (Vs) is filtered by the input filter inductor (L1) and the input filter capacitor (C1) to remove high-frequency ripple before being sent to the power frequency rectifier bridge (D1-D4) to be rectified into a full-wave waveform. The rectified full-wave waveform is then input to a symmetrical charge pump high power factor half-bridge converter composed of the second inductor (L2), the second capacitor (C2), the fourth capacitor (C4), the fifth diode (D5), the seventh diode (D7), the third inductor (L3), the third capacitor (C3), the fifth capacitor (C5), the sixth diode (D6), the eighth diode (D8), the sixth capacitor (C6), the first power switch (M1), the thirteenth diode (D13), the second power switch (M2), the fourteenth diode (D14), the seventh capacitor (C7), the eighth capacitor (C8), the transformer (TL1), the high-frequency rectifier bridge (D9-D12), the fourth inductor (L4), the ninth capacitor (C9), and the load (R).

[0030] One end of the input filter inductor (L1) is connected to one end of the AC power supply (Vs), and the other end of the input filter inductor (L1) is connected to the input filter capacitor (C1), the anode of the first diode (D1), and the cathode of the second diode (D2); the other end of the filter capacitor (C1) is connected to the anode of the third diode (D3), the cathode of the fourth diode (D4), and the other end of the input AC power supply (Vs).

[0031] One end of the second inductor (L2) is connected to the cathode of the first diode (D1) and the cathode of the third diode (D3). The other end of the second inductor (L2) is connected to the anode of the fifth diode (D5), the cathode of the seventh diode (D7), one end of the second capacitor (C2), and one end of the fourth capacitor (C4). The other end of the second capacitor (C2) is connected to one end of the third capacitor (C3), the anode of the seventh diode (D7), the cathode of the eighth diode (D8), and one end of the third inductor (L3). The other end of the third capacitor (C3) is connected to the cathode of the eighth diode. (D8) anode, second diode (D2) anode, fourth diode (D4) anode, sixth diode (D6) cathode, and one end of fifth capacitor (C5) are connected; the other end of fourth capacitor (C4) is connected to the cathode of fifth diode (D5), one end of sixth capacitor (C6), one end of seventh capacitor (C7), the drain of first power switch (M1), and the cathode of thirteenth diode (D13); the other end of sixth capacitor (C6) is connected to the anode of sixth diode (D6), fourteenth diode (D14) anode, and fifth capacitor (C5) The other end of the first capacitor (C7) is connected to one end of the eighth capacitor (C8) and the source of the second power switch (M2); the other end of the third inductor (L3) is connected to the source of the first power switch (M1), the drain of the second power switch (M2), the anode of the thirteenth diode (D13), the cathode of the fourteenth diode (D14), and the second terminal of the transformer (TL1); the other end of the seventh capacitor (C7) is connected to the other end of the eighth capacitor (C8) and the first terminal of the transformer T; the third terminal of the transformer T is connected to the anode of the ninth diode (D9) and the source of the tenth ...). The cathodes of diodes (D10) are connected; terminal ④ of transformer T is connected to the anode of the eleventh diode (D11) and the cathode of the twelfth diode (D12); one end of the fourth inductor (L4) is connected to the cathodes of the ninth diode (D9) and the eleventh diode (D11); the other end of the fourth inductor (L4) is connected to one end of the ninth capacitor (C9) and one end of the load resistor (R); the other end of the ninth capacitor (C9) is connected to the anode of the tenth diode (D10), the anode of the twelfth diode (D12), and the other end of the load resistor (R).

[0032] The thirteenth diode (D13) can be an anti-parallel diode or a body diode of the first power switch (M1); the fourteenth diode (D14) can be an anti-parallel diode or a body diode of the second power switch (M2).

[0033] The sixth capacitor (C6) is the DC bus capacitor, and C6 >> C2, C6 >> C3, C6 >> C4, C6 >> C5.

[0034] The input filter inductor (L1), input filter capacitor (C1), power frequency rectifier bridge (D1-D4), second inductor (L2), second capacitor (C2), third capacitor (C3), fourth capacitor (C4), fifth capacitor (C5), sixth capacitor (C6), first power switch (M1), second power switch (M2), fifth diode (D5), sixth diode (D6), seventh diode (D7), eighth diode (D8), thirteenth diode (D13), and fourteenth diode (D14) constitute a symmetrical charge pump high power factor correction circuit.

[0035] The third inductor (L3), together with the second capacitor (C2) and the third capacitor (C3), forms the resonant branch in the symmetrical charge pump power factor correction circuit, and C2 = C3.

[0036] The fourth capacitor (C4) and the fifth capacitor (C5) constitute the charging pump capacitor in the symmetrical charging pump power factor correction circuit, and C4 = C5.

[0037] The fifth diode (D5) and the sixth diode (D6) provide a path for the energy transfer from the resonant branch in the power factor correction circuit to the DC bus capacitor (C6).

[0038] The seventh diode (D7) and the eighth diode (D8) are clamping diodes in the power factor correction circuit.

[0039] The current flowing through the second inductor (L2) tracks the input voltage in each switching cycle to achieve power factor correction.

[0040] The first power switch (M1), the second power switch (M2), the thirteenth diode (D13), the fourteenth diode (D14), the seventh capacitor (C7), the eighth capacitor (C8), the transformer (TL1), the high-frequency rectifier bridge (D9-D12), the fourth inductor (L4), the ninth capacitor (C9), and the load (R) realize a half-bridge DC / DC conversion, and C7=C8.

[0041] The switching frequencies of the first power switch (M1) and the second power switch (M2) are higher than the resonant frequency of the resonant circuit composed of the third inductor (L3), the second capacitor (C2), and the third capacitor (C3).

[0042] The converter uses pulse frequency control.

[0043] The following is based on Figure 1 The main circuit structure shown is Figure 2 The working waveform shown, combined with Figures 3 to 7 Describe the specific working principle of this invention. Figure 2 and Figure 8 The simulation results are for the symmetrical charge pump AC / DC converter.

[0044] Figure 3 The equivalent circuit before t0 is shown. M2, D6, and D8 are turned on. The current IL3 in the third inductor (L3) flows through M2, D6, and D8 on one hand, and charges C2 on the other hand. The difference between the current IL2 in the second inductor (L2) and the current flowing through C2 discharges C4.

[0045] Figure 4 This represents the equivalent circuit during the time period t0-t1. At time t0, M2 is turned off, and current IL3 flows through D13, C6, D6, and D8. Current IL3 begins to decrease, and the currents in D6 and D8 also decrease accordingly. C2 remains in a charging state, while C4 is in a discharging state. Since D13 is conducting, M1 is turned on at this time, achieving zero-voltage and zero-current turn-on. When the current in IL3 drops to zero, this stage ends, and simultaneously, the currents in D6 and D8 also drop to zero and are turned off.

[0046] Figure 5 This represents the equivalent circuit during the time period t1–t2. At time t1, M1 is already conducting, and the current in IL3 flows in the reverse direction through M1, charging C3 and C5, causing the voltages on C3 and C5 to rise. Since C2 is still in a charging state, the voltage on C2 rises to its maximum value. During this stage, C4 is still in a discharging state. This stage ends when the voltage across C4 drops to zero.

[0047] Figure 6 This represents the equivalent circuit during the time period t2–t3. At time t2, the voltage across C4 discharges to zero, causing D5 to conduct. The current IL3 discharges through D5 and M1 to C2, and continues to charge C3 and C5, causing the voltages on C3 and C5 to rise continuously, while the voltage on C2 continues to fall. When the voltage on C2 drops to zero, this stage ends, and at this time the voltage on C5 rises to its maximum value.

[0048] Figure 7 This represents the equivalent circuit during the time period t3–t4. When the voltage across C2 drops to zero, D7 begins to conduct. Current IL3 flows through D7, D5, and M1, and also charges C3. Due to the difference in current between the second inductor (L2) and the current in C3, C5 is discharged, causing the voltage across C5 to drop. This stage ends when M1 is turned off.

[0049] Before t0, D9 and D12 in the subsequent half-bridge circuit are turned on because M2 is turned on. Between t0 and t4, D10 and D11 in the half-bridge circuit are turned on because M1 or D13 is turned on. After full-bridge rectification by diodes and filtering by L4 and C9, the required DC voltage is output to the load.

[0050] Due to the symmetry of the circuit, the operation of the second half-cycle is similar to that of the first half-cycle, and will not be described in detail here.

[0051] from Figure 8 The simulation results show that the AC input current and AC input voltage are in phase, the input current has good sinusoidal characteristics, the input power factor is close to 1, and the output DC voltage is stable at the design value.

[0052] This invention is not limited to the above embodiments. Based on the technical solutions disclosed in this invention, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.

Claims

1. A symmetrical charge pump high power factor AC / DC converter, characterized in that, It includes an input AC power supply (Vs), an input filter inductor (L1), an input filter capacitor (C1), a power frequency rectifier bridge (D1-D4), and a symmetrical charge pump high power factor half-bridge converter. The symmetrical charge pump high power factor half-bridge converter includes: a second inductor (L2), a second capacitor (C2), a fourth capacitor (C4), a fifth diode (D5), a seventh diode (D7), a third inductor (L3), a third capacitor (C3), a fifth capacitor (C5), a sixth diode (D6), an eighth diode (D8), a sixth capacitor (C6), a first power switch (M1), a thirteenth diode (D13), a second power switch (M2), a fourteenth diode (D14), a seventh capacitor (C7), an eighth capacitor (C8), a transformer (TL1), a high-frequency rectifier bridge (D9-D12), a fourth inductor (L4), a ninth capacitor (C9), and a load (R); The input AC power supply (Vs) is filtered by the input filter inductor (L1) and the input filter capacitor (C1) to remove high-frequency ripple before being sent to the power frequency rectifier bridge (D1-D4) to be rectified into a full-wave waveform. The rectified full-wave waveform is then input to the symmetrical charge pump high power factor half-bridge converter.

2. The symmetrical charge pump high power factor AC / DC converter according to claim 1, characterized in that: One end of the input filter inductor (L1) is connected to the positive terminal of the AC power supply (Vs), and the other end of the input filter inductor (L1) is connected to the input filter capacitor (C1), the anode of the first diode (D1), and the cathode of the second diode (D2); the other end of the filter capacitor (C1) is connected to the anode of the third diode (D3), the cathode of the fourth diode (D4), and the negative terminal of the input AC power supply (Vs).

3. The symmetrical charge pump high power factor AC / DC converter according to claim 1, characterized in that: One end of the second inductor (L2) is connected to the cathode of the first diode (D1) and the cathode of the third diode (D3). The other end of the second inductor (L2) is connected to the anode of the fifth diode (D5), the cathode of the seventh diode (D7), one end of the second capacitor (C2), and one end of the fourth capacitor (C4). The other end of the second capacitor (C2) is connected to one end of the third capacitor (C3), the anode of the seventh diode (D7), the cathode of the eighth diode (D8), and one end of the third inductor (L3). The other end of the third capacitor (C3) is connected to the cathode of the eighth diode (D4). The anode of diode (D8), the anode of the second diode (D2), the anode of the fourth diode (D4), the cathode of the sixth diode (D6), and one end of the fifth capacitor (C5) are connected; the other end of the fourth capacitor (C4) is connected to the cathode of the fifth diode (D5), one end of the sixth capacitor (C6), one end of the seventh capacitor (C7), the drain of the first power switch (M1), and the cathode of the thirteenth diode (D13); the other end of the sixth capacitor (C6) is connected to the anode of the sixth diode (D6), the anode of the fourteenth diode (D14), and the fifth capacitor (C7). 5) The other end of the capacitor (C8) is connected to one end of the eighth capacitor (C8) and the source of the second power switch (M2); the other end of the third inductor (L3) is connected to the source of the first power switch (M1), the drain of the second power switch (M2), the anode of the thirteenth diode (D13), the cathode of the fourteenth diode (D14), and the second terminal of the transformer (TL1); the other end of the seventh capacitor (C7) is connected to the other end of the eighth capacitor (C8) and the first terminal of the transformer T; the third terminal of the transformer T is connected to the anode of the ninth diode (D9) and the tenth... The cathodes of diodes (D10) are connected; terminal ④ of transformer T is connected to the anode of the eleventh diode (D11) and the cathode of the twelfth diode (D12); one end of the fourth inductor (L4) is connected to the cathodes of the ninth diode (D9) and the eleventh diode (D11); the other end of the fourth inductor (L4) is connected to one end of the ninth capacitor (C9) and one end of the load resistor (R); the other end of the ninth capacitor (C9) is connected to the anode of the tenth diode (D10), the anode of the twelfth diode (D12), and the other end of the load resistor (R).

4. The symmetrical charge pump high power factor AC / DC converter according to any one of claims 1-3, characterized in that: The thirteenth diode (D13) may be an anti-parallel diode or a body diode of the first power switch (M1); the fourteenth diode (D14) may be an anti-parallel diode or a body diode of the second power switch (M2).

5. The symmetrical charge pump high power factor AC / DC converter according to any one of claims 1-3, characterized in that: The sixth capacitor (C6) is the DC bus capacitor, and its capacitance is greater than that of the second capacitor (C2), the third capacitor (C3), the fourth capacitor (C4), and the fifth capacitor (C5).

6. The symmetrical charge pump high power factor AC / DC converter according to any one of claims 1-3, characterized in that: The converter uses pulse frequency control.

7. The symmetrical charge pump high power factor AC / DC converter according to any one of claims 1-3, characterized in that: The input filter inductor (L1), input filter capacitor (C1), power frequency rectifier bridge (D1-D4), second inductor (L2), second capacitor (C2), third capacitor (C3), fourth capacitor (C4), fifth capacitor (C5), sixth capacitor (C6), first power switch (M1), second power switch (M2), fifth diode (D5), sixth diode (D6), seventh diode (D7), eighth diode (D8), thirteenth diode (D13), and fourteenth diode (D14) constitute a symmetrical charge pump high power factor correction circuit.

8. The symmetrical charge pump high power factor AC / DC converter according to any one of claims 1-3, characterized in that: The third inductor (L3), together with the second capacitor (C2) and the third capacitor (C3), forms the resonant branch in the high power factor correction circuit of the symmetrical charge pump, and C2=C3; the fourth capacitor (C4) and the fifth capacitor (C5) form the charge pump capacitor in the high power factor correction circuit of the symmetrical charge pump, and C4=C5.

9. The symmetrical charge pump high power factor AC / DC converter according to any one of claims 1-3, characterized in that: The seventh diode (D7) and the eighth diode (D8) are clamping diodes in the power factor correction circuit.

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