TWI463771B - Llc resonant converting system with continuous-current-mode power-factor-correction - Google Patents

Description

LLC resonant power conversion system with continuous current mode power factor correction

The present invention relates to an LLC resonant power conversion system, and more particularly to an LLC resonant power conversion system having continuous current mode power factor correction.

Referring to Figure 1, there is shown a circuit diagram of a conventional LLC resonant DC power converter. The conventional LLC resonant DC power converter 10 has a zero voltage switching function, which can reduce the switching loss of the switch, thereby improving the circuit efficiency. In addition, when the transformer in the circuit replaces the circuit resonant inductance with the inherent leakage inductance, the circuit components can be saved and the circuit volume can be reduced. Since the conventional LLC resonant DC power converter has the above advantages, it is often used in a power supply system.

Referring to Figure 2, there is shown a circuit diagram of a conventional LLC power amplifier with power factor correction. The LLC resonant power converter 20 with power factor correction is known to add a power factor correction circuit from the AC terminal to the DC terminal to improve its power factor and reduce harmonic distortion. However, since the power factor correction circuit is increased, the number of circuit components and the control circuit are increased, and the circuit cost is increased, so that it is not suitable for a low power product.

Referring to FIG. 3, there is shown a circuit diagram of a conventional DC-side discontinuous current mode power factor correction LLC resonant power converter. In order to improve the above disadvantages, the DC-resonant power converter 30 of the DC-side discontinuous current mode power factor correction is designed to be applied to a power supply system. However, the conventional converter 30 still has the following disadvantages: (1) High electromagnetic noise interference; (2) high voltage and current stress on the switch and diode components; and (3) not suitable for high power applications.

Therefore, it is necessary to provide an innovative and progressive LLC resonant power conversion system with continuous current mode power factor correction to solve the above problems.

The invention provides an LLC resonant power conversion system with continuous current mode power factor correction, comprising: a rectifier, a charging pump power factor corrector and an LLC resonant power converter. The charge pump power factor modifier is coupled to the rectifier for correcting a power factor. The charge pump power factor corrector has a power factor correction inductor that operates in a continuous current mode. The LLC resonant power converter is coupled to the charge pump power factor corrector.

The LLC resonant power conversion system with continuous current mode power factor correction of the present invention utilizes the charging pump power factor corrector to save circuit component count, thereby reducing its cost, and reducing the power factor correction inductor volume to improve power density. Since the power factor correction inductor operates in the continuous current mode, the input current harmonic distortion can be reduced and the input power can be improved, and the switching loss and the diode conduction loss can be reduced.

Referring to Figure 4, there is shown a block diagram of an LLC resonant power conversion system having continuous current mode power factor correction in accordance with the present invention. The LLC resonant power conversion system 40 having continuous current mode power factor correction of the present invention includes a filter 41, a rectifier 42, a charge pump power factor corrector 43, and an LLC resonant power converter 44. The filter 41 is used to filter an AC input power source and is connected to the rectifier 42. Preferably, the rectifier 42 is a full wave rectifier. The charge pump power factor modifier 43 is coupled to the rectifier 42 for correcting the power factor. The LLC resonant power converter 44 is coupled to the charge pump power factor corrector 43.

5A to 5D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a first embodiment of the present invention. Referring first to FIG. 5A, the LLC resonant power converter 44 includes a first capacitor 441, a first switch 442, a second switch 443, a resonant capacitor 444, a first resonant inductor 445, and a second resonant inductor. 446, a step-down transformer 447 and a load circuit 448. The first switch 442 and the second switch 443 are connected in series with the first capacitor 441. The resonant capacitor 444 is connected in series with the first resonant inductor 445, and the resonant capacitor 444 is connected to the first switch 442 and the second One of the switches 443 is connected to the node A, and the first resonant inductor 445 is connected to the second resonant inductor 446. The second resonant inductor 446 is connected in parallel with the input end of the step-down transformer 447. The output of the step-down transformer 447 is connected to the load. Circuitry 448 is connected in parallel.

The charging pump power factor corrector 43 is a voltage source charging pump power factor corrector comprising: a power factor correction inductor 431, an equivalent diode 432 and an equivalent capacitor 433. The power factor correction inductor 431 is coupled to an output of the rectifier 42 and the power factor correction inductor 431 is coupled to the equivalent diode 432. The power factor correction inductor 431 operates in a continuous current mode, the equivalent diode 432 is connected to the equivalent capacitor 433 and is connected to the first capacitor 441. The equivalent capacitor 433 is connected to the connection node A of the first switch 442 and the second switch 443.

5B to 5D, the charging pump power factor corrector 43 is also a voltage source charging pump power factor corrector. In FIG. 5B, the equivalent capacitor 433 is connected to one of the input terminals of the step-down transformer 447. B; in FIG. 5C, the equivalent capacitor 433 is connected to one of the first output terminals C of the step-down transformer 447; in FIG. 5D, the equivalent capacitor 433 is connected to one of the second output terminals of the step-down transformer 447. D.

6A to 6D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a second embodiment of the present invention. In FIGS. 6A to 6D, the charging pump power factor corrector 43 is also a voltage source charging pump power factor corrector, and the connection node of the equivalent capacitor 433 of different implementations is the same as FIG. 5A to FIG. 5D, but The power factor correction inductor 431 is coupled to one of the input terminals of the rectifier 42, that is, the power factor correction inductor 431 is disposed at the AC terminal.

7A to 7D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a third embodiment of the present invention. In FIGS. 7A to 7D, the charge pump power factor corrector 43 is also a voltage source charging pump power factor corrector, but the equivalent diode is one of the diodes of the rectifier 42, that is, One of the diodes of the rectifier 42 has the function of the equivalent diode.

8A to 8D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a fourth embodiment of the present invention. In FIGS. 8A to 8D, the charge pump power factor corrector 43 is also a voltage source charging pump power factor corrector, but the rectifier 42 has two rectifying diodes, and the LLC resonant power converter 44 The first switch 442 and the second switch 443 have a rectifying function.

9A to 9D are diagrams showing four embodiments of an embodiment of an LLC resonant power supply conversion system 50 having a continuous current mode power factor correction according to a fifth embodiment of the present invention. Referring first to FIG. 9A, the LLC resonant power converter 54 includes a first capacitor 541, a first switch 542, a second switch 543, a first resonant capacitor 544, a second resonant capacitor 545, and a first The resonant inductor 546, a second resonant inductor 547, a step-down transformer 548, and a load circuit 549. The first switch 542 and the second switch 543 are connected in series and connected in parallel with the first capacitor 541. The first resonant capacitor 544 and the second resonant capacitor 545 are connected in series, and are connected in parallel with the first switch 542 and the second switch 543. The first resonant inductor 546 is connected to one of the first switch 542 and the second switch 543. The first resonant inductor 546 is connected to the second resonant inductor 547, the second resonant inductor 547 and the step-down transformer. The input end of the 548 is connected in parallel, and the second input end of the step-down transformer 548 is connected to the first resonant capacitor 544 and one of the second resonant capacitors 545 is connected to the node E. The output end of the step-down transformer 548 and the load circuit 549 in parallel.

The charging pump power factor corrector 43 is a voltage source charging pump power factor corrector comprising: a power factor correction inductor 431, an equivalent diode 432 and an equivalent capacitor 433. The power factor correction inductor 431 is coupled to an output of the rectifier 42 and the power factor correction inductor 431 is coupled to the equivalent diode 432. The power factor correction inductor 431 operates in a continuous current mode, the equivalent diode 432 is connected to the equivalent capacitor 433 and connected to the first capacitor 441 . The equivalent capacitor 433 is connected to the connection node E of the first resonant capacitor 544 and the second resonant capacitor 545 .

Referring to FIGS. 9B through 9D, the charge pump power factor corrector 43 is also a voltage source charging pump power factor corrector. In FIG. 9B, the equivalent capacitor 433 is coupled to one of the first inputs of the step-down transformer 548. In FIG. 9C, the equivalent capacitor 433 is connected to one of the first output terminals G of the step-down transformer 548; in FIG. 9D, the equivalent capacitor 433 is connected to one of the second output of the step-down transformer 548. End H.

10A to 10D are views showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a sixth embodiment of the present invention. In FIGS. 10A to 10D, the charge pump power factor corrector 43 is also a voltage source charging pump power factor corrector, but the power factor correction inductor 431 is connected to one input of the rectifier 42, that is, the power The factor correction inductor 431 is disposed at the alternating current end.

11A to 11D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a seventh embodiment of the present invention. In FIGS. 11A to 11D, the charge pump power factor corrector 43 is also a voltage source charging pump power factor corrector, but the equivalent diode is one of the diodes of the rectifier 42, that is, One of the diodes of the rectifier 42 has the function of the equivalent diode.

12A to 12D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to an eighth embodiment of the present invention. In FIGS. 12A to 12D, the charge pump power factor corrector 43 is also a voltage source charging pump power factor corrector, but the rectifier 42 has two rectifying diodes, and the LLC resonant power converter 54 The first switch 542 and the second switch 543 have a rectifying function.

13A to 13B are schematic diagrams showing two embodiments of an LLC resonant power conversion system 60 having a continuous current mode power factor correction according to a ninth embodiment of the present invention. Referring first to Figure 13A, the LLC resonant power converter 44 is identical to the LLC resonant power converter 44 of Figure 5A.

The charging pump power factor corrector 61 is a current source charging pump power factor corrector comprising: a power factor correction inductor 611, an equivalent diode 612 and an equivalent capacitor 613. The equivalent diode 612 is connected to the equivalent capacitor 613. The equivalent capacitor 613 and one of the equivalent diodes 612 are connected to a second input end of the step-down transformer 447.

Referring to FIG. 13B, the charge pump power factor corrector 61 is also a current source charging pump power factor corrector, and the equivalent capacitor 613 is connected in parallel with the equivalent diode 612.

14A to 14B are schematic diagrams showing two embodiments of an LLC resonant power conversion system having a continuous current mode power factor correction according to a tenth embodiment of the present invention. In FIGS. 14A to 14B, the charge pump power factor corrector 61 is also a current source charging pump power factor corrector, but the power factor correction inductor 611 is connected to one input of the rectifier 42, that is, the power The factor correction inductor 611 is disposed at the alternating current end.

15A to 15C are views showing three embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to an eleventh embodiment of the present invention. In FIGS. 15A to 15C, the charge pump power factor corrector 61 is also a current source charging pump power factor corrector, but the equivalent diode is one of the diodes of the rectifier 42, that is, One of the diodes of the rectifier 42 has the equivalent diode, and the equivalent capacitor 613 is respectively connected in parallel with one of the diodes of the rectifier 42, as shown in FIGS. 15B and 15C.

16A to 16C are views showing three embodiments of an embodiment of an LLC resonant power supply conversion system having a continuous current mode power factor correction according to a twelfth embodiment of the present invention. In FIGS. 16A to 16C, the charge pump power factor corrector 61 is also a current source charging pump power factor corrector, but the rectifier 42 has two rectifying diodes, and the LLC resonant power converter 44 The first switch 442 and the second switch 443 have a rectifying function, and the equivalent capacitor 613 is respectively connected in parallel with one of the diodes of the rectifier 42, as shown in FIGS. 16B and 16C.

17A to 17B are schematic diagrams showing two embodiments of an LLC resonant power conversion system 70 having a continuous current mode power factor correction according to a thirteenth embodiment of the present invention. Referring first to Figure 17A, the LLC resonant power converter 44 is identical to the LLC resonant power converter 44 of Figure 5A.

The charging pump power factor corrector 71 is a voltage current source charging pump power factor corrector, comprising: a power factor correction inductor 711, a first equivalent capacitor 712, a second equivalent capacitor 713, a first The third equivalent capacitor 714, a first equivalent diode 715 and a second equivalent diode 716. The first equivalent capacitor 712 is connected to one of the first input terminals I of the step-down transformer 447, the second equivalent capacitor 713 is connected in parallel with the first equivalent diode 715, and the third equivalent capacitor 714 is equivalent to the second equivalent The diodes 716 are connected in parallel and are connected to a second input of the step-down transformer 447.

Referring to FIG. 17B, the charge pump power factor corrector 71 is also a voltage current source charging pump power factor corrector, and the first equivalent capacitor 712 is connected to one of the first output terminals J of the step-down transformer 447.

18A to 18B are schematic diagrams showing two embodiments of an LLC resonant power conversion system having a continuous current mode power factor correction according to a fourteenth embodiment of the present invention. In FIGS. 18A to 18B, the charge pump power factor corrector 71 is also a voltage current source charging pump power factor corrector, but the power factor correction inductor 711 is connected to one input of the rectifier 42, that is, the The power factor correction inductor 711 is disposed at the alternating current terminal.

19A to 19B are schematic diagrams showing two embodiments of an LLC resonant power conversion system having a continuous current mode power factor correction according to a fifteenth embodiment of the present invention. In FIGS. 19A to 19B, the charge pump power factor corrector 71 is also a voltage current source charging pump power factor corrector, but the first equivalent diode is one of the diodes of the rectifier 42. That is, one of the diodes of the rectifier 42 has the first equivalent diode, and the second equivalent capacitor 713 is connected in parallel with one of the diodes of the rectifier 42.

20A to 20B are schematic diagrams showing two embodiments of an LLC resonant power conversion system having a continuous current mode power factor correction according to a sixteenth embodiment of the present invention. In FIGS. 20A to 20B, the charge pump power factor corrector 71 is also a voltage current source charging pump power factor corrector, but the rectifier 42 has two rectifying diodes, and the LLC resonant power converter 44 The first switch 442 and the second switch 443 have a rectifying function, and the second equivalent capacitor 713 is respectively connected in parallel with one of the diodes of the rectifier 42.

Referring to Figure 21, there is shown a waveform diagram of the analog input voltage and input current for the circuit of Figure 11A of the present invention. Use SIMPLIS The circuit simulation software, according to the relationship between the analog input voltage and the current of the circuit of FIG. 11A of the present invention, the waveforms of the input voltage and the input current show that the two waveforms are relatively close, so the power factor is approximately 1, so the present invention has continuous current mode power factor correction. The LLC resonant power conversion system increases input power.

The LLC resonant power conversion system with continuous current mode power factor correction utilizes the charge pump power factor corrector to save circuit component count, thereby reducing cost, and reducing power factor correction inductance and input filter volume. Increase power density. Since the power factor correction inductor operates in the continuous current mode, the input current harmonic distortion can be reduced and the input power can be improved, and the switching loss and the diode conduction loss can be reduced. Additionally, a portion of the LLC resonant power converter of the above embodiments is operable with zero voltage switching.

However, the above embodiments are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. Therefore, those skilled in the art can make modifications and changes to the above embodiments without departing from the spirit of the invention. The scope of the invention should be as set forth in the appended claims.

10. . . Conventional LLC Resonant DC Power Converter

20. . . Conventional LLC Power Resonant Power Converter with Power Factor Correction

30. . . Conventional DC-end discontinuous current mode power factor correction LLC resonant power converter

40. . . LLC resonant power conversion system of the invention

41. . . filter

42. . . Rectifier

43. . . Charging pump power factor corrector

44. . . LLC Resonant Power Converter

50. . . LLC resonant power conversion system of the invention

54. . . LLC Resonant Power Converter

60. . . LLC resonant power conversion system of the invention

61. . . Charging pump power factor corrector

70. . . LLC resonant power conversion system of the invention

71. . . Charging pump power factor corrector

431. . . Power factor correction inductor

432. . . Equivalent diode

433. . . Equivalent capacitance

441. . . First capacitor

442. . . First switch

443. . . Second switch

444. . . Resonant capacitor

445. . . First resonant inductor

446. . . Second resonant inductor

447. . . Step-down transformer

448. . . Load circuit

541. . . First capacitor

542. . . First switch

543. . . Second switch

544. . . First resonant capacitor

545. . . Second resonant capacitor

546. . . First resonant inductor

547. . . Second resonant inductor

548. . . Step-down transformer

549. . . Load circuit

611. . . Power factor correction inductor

612. . . Equivalent diode

613. . . Equivalent capacitance

711. . . Power factor correction inductor

712. . . First equivalent capacitance

713. . . Second equivalent capacitance

714. . . Third equivalent capacitance

715. . . First equivalent diode

716. . . Second equivalent diode

1 shows a circuit diagram of a conventional LLC resonant DC power converter;

2 is a schematic circuit diagram of a conventional LLC resonant power converter with power factor correction;

3 is a circuit diagram showing a conventional DC-side discontinuous current mode power factor correction LLC resonant power converter;

4 is a block diagram showing an LLC resonant power conversion system with continuous current mode power factor correction according to the present invention;

5A to 5D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a first embodiment of the present invention;

6A to 6D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a second embodiment of the present invention;

7A to 7D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a third embodiment of the present invention;

8A to 8D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a fourth embodiment of the present invention;

9A to 9D are schematic diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a fifth embodiment of the present invention;

10A to 10D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a sixth embodiment of the present invention;

11A to 11D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a seventh embodiment of the present invention;

12A to 12D are diagrams showing four embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to an eighth embodiment of the present invention;

13A to 13B are schematic diagrams showing two embodiments of an LLC resonant power conversion system having a continuous current mode power factor correction according to a ninth embodiment of the present invention;

14A to 14B are schematic diagrams showing two embodiments of an LLC resonant power conversion system having a continuous current mode power factor correction according to a tenth embodiment of the present invention;

15A to 15C are schematic diagrams showing three embodiments of an LLC resonant power conversion system having a continuous current mode power factor correction according to an eleventh embodiment of the present invention;

16A to 16C are diagrams showing three embodiments of an embodiment of an LLC resonant power conversion system having a continuous current mode power factor correction according to a twelfth embodiment of the present invention;

17A to 17B are schematic diagrams showing two embodiments of an LLC resonant power conversion system having a continuous current mode power factor correction according to a thirteenth embodiment of the present invention;

18A to 18B are schematic diagrams showing two embodiments of an LLC resonant power conversion system having a continuous current mode power factor correction according to a fourteenth embodiment of the present invention;

19A to 19B are schematic diagrams showing two embodiments of an LLC resonant power conversion system having a continuous current mode power factor correction according to a fifteenth embodiment of the present invention;

20A to 20B are views showing a circuit diagram of two embodiments of an LLC resonant power conversion system having a continuous current mode power factor correction according to a sixteenth embodiment of the present invention; and

Figure 21 is a diagram showing the waveforms of the analog input voltage and the input current of the circuit of Figure 11A of the present invention.

40. . . LLC resonant power conversion system of the invention

41. . . filter

42. . . Rectifier

43. . . Charging pump power factor corrector

44. . . LLC Resonant Power Converter

Claims (16)

An LLC resonant power conversion system with continuous current mode power factor correction, comprising: a rectifier; a charging pump power factor corrector connected to the rectifier for correcting a power factor, the charging pump power factor corrector having a a power factor correction inductor, the power factor correction inductor operating in a continuous current mode; an LLC resonant power converter coupled to the charge pump power factor corrector; and a filter for filtering an AC input power source, and Connected to the rectifier, the rectifier is a full-wave rectifier; wherein the LLC resonant power converter comprises: a first capacitor, a first switch, a second switch, a resonant capacitor, a first resonant inductor, a first a second resonant inductor, a step-down transformer and a load circuit, wherein the first switch and the second switch are connected in series with the first capacitor, the resonant capacitor is connected in series with the first resonant inductor, and the resonant capacitor is connected to the first a switch and one of the second switches are connected to the node, the first resonant inductor is connected to the second resonant inductor, and the second resonant Parallel to the input end of the step-down transformer, the output end of the step-down transformer is connected in parallel with the load circuit; wherein the charge pump power factor corrector is a voltage source charging pump power factor corrector, which further comprises: first class An equivalent diode and an equivalent capacitor, the equivalent diode is connected to the equivalent capacitor, and the equivalent capacitor is connected to The connection node of the first switch and the second switch, one of the input terminals of the step-down transformer or one of the output terminals of the step-down transformer. The LLC resonant power conversion system of claim 1, wherein the equivalent diode is one of the diodes of the rectifier. The LLC resonant power conversion system of claim 1, wherein the power factor correction inductor is coupled to an output of the rectifier. The LLC resonant power conversion system of claim 1, wherein the power factor correction inductor is coupled to one of the input terminals of the rectifier. The LLC resonant power conversion system of claim 1, wherein the rectifier has two rectifying diodes, and the first switch and the second switch of the LLC resonant power converter have a rectifying function. An LLC resonant power conversion system with continuous current mode power factor correction, comprising: a rectifier; a charging pump power factor corrector connected to the rectifier for correcting a power factor, the charging pump power factor corrector having a a power factor correction inductor, the power factor correction inductor operating in a continuous current mode; an LLC resonant power converter coupled to the charge pump power factor corrector; and a filter for filtering an AC input power source, and Connected to the rectifier, the rectifier is a full-wave rectifier; wherein the LLC resonant power converter comprises: a first capacitor, a first switch, a second switch, a first resonant capacitor, and a second resonant a capacitor, a first resonant inductor, a second resonant inductor, a step-down transformer, and a load circuit, wherein the first switch and the second switch are connected in series with the first capacitor, the first resonant capacitor and the second The resonant capacitor is connected in series with the first switch and the second switch, and the first resonant inductor is connected to one of the first switch and the second switch, and the first resonant inductor is connected to the second resonant inductor. The second resonant inductor is connected in parallel with the input end of the step-down transformer, and a second input end of the step-down transformer is connected to one of the first resonant capacitor and the second resonant capacitor, and the output of the step-down transformer Parallel to the load circuit. The LLC resonant power conversion system of claim 6, wherein the power factor correction inductor is coupled to an output of the rectifier. The LLC resonant power conversion system of claim 6, wherein the power factor correction inductor is coupled to one of the input terminals of the rectifier. The LLC resonant power conversion system of claim 6, wherein the rectifier has two rectifying diodes, and the first switch and the second switch of the LLC resonant power converter have a rectifying function. The LLC resonant power conversion system of 7, 8 or 9 wherein the charging pump power factor corrector is a voltage source charging pump power factor corrector, further comprising: an equivalent diode and an equivalent capacitor, The equivalent diode is connected to the equivalent capacitor, and the equivalent capacitor is connected to the connection node of the first resonant capacitor and the second resonant capacitor, the first input of the step-down transformer or the step-down transformer. One of the outputs. The LLC resonant power conversion system of claim 10, wherein the equivalent diode is one of the diodes of the rectifier. An LLC resonant power conversion system with continuous current mode power factor correction, comprising: a rectifier; a charging pump power factor corrector connected to the rectifier for correcting a power factor, the charging pump power factor corrector having a a power factor correction inductor, the power factor correction inductor operating in a continuous current mode; an LLC resonant power converter coupled to the charge pump power factor corrector; and a filter for filtering an AC input power source, and Connected to the rectifier, the rectifier is a full-wave rectifier; wherein the LLC resonant power converter comprises: a first capacitor, a first switch, a second switch, a resonant capacitor, a first resonant inductor, a first a second resonant inductor, a step-down transformer and a load circuit, wherein the first switch and the second switch are connected in series with the first capacitor, the resonant capacitor is connected in series with the first resonant inductor, and the resonant capacitor is connected to the first a switch and one of the second switches are connected to the node, the first resonant inductor is connected to the second resonant inductor, and the second resonant Parallel to the input end of the step-down transformer, the output of the step-down transformer is connected in parallel with the load circuit; wherein the charge pump power factor corrector is a current source charging pump power factor corrector, and the other comprises: An equivalent diode and an equivalent capacitor, the equivalent diode is connected to the equivalent capacitor, and the equivalent capacitor is connected to one of the equivalent diodes to the second of the step-down transformer Input. The LLC resonant power conversion system of claim 12, wherein the equivalent diode is one of the diodes of the rectifier. The LLC resonant power conversion system of claim 12, wherein the equivalent capacitance is in parallel with the equivalent diode. An LLC resonant power conversion system with continuous current mode power factor correction, comprising: a rectifier; a charging pump power factor corrector connected to the rectifier for correcting a power factor, the charging pump power factor corrector having a a power factor correction inductor, the power factor correction inductor operating in a continuous current mode; an LLC resonant power converter coupled to the charge pump power factor corrector; and a filter for filtering an AC input power source, and Connected to the rectifier, the rectifier is a full-wave rectifier; wherein the LLC resonant power converter comprises: a first capacitor, a first switch, a second switch, a resonant capacitor, a first resonant inductor, a first a second resonant inductor, a step-down transformer and a load circuit, wherein the first switch and the second switch are connected in series with the first capacitor, the resonant capacitor is connected in series with the first resonant inductor, and the resonant capacitor is connected to the first a switch and one of the second switches are connected to the node, the first resonant inductor is connected to the second resonant inductor, and the second resonant In parallel with the input of the step-down transformer, the output terminal of the step-down transformer to the load circuit and The charging pump power factor corrector is a voltage current source charging pump power factor corrector, and further comprising: a first equivalent capacitor, a second equivalent capacitor, a third equivalent capacitor, and a a first equivalent diode and a second equivalent diode, the first equivalent capacitor being connected to one of the first input terminals of the step-down transformer or the first output end of the step-down transformer, the second The effective capacitor is connected in parallel with the first equivalent diode, and the third equivalent capacitor is connected in parallel with the second equivalent diode and is connected to one of the second input terminals of the step-down transformer. The LLC resonant power conversion system of claim 15, wherein the equivalent diode is one of the diodes of the rectifier.