Power conversion unit

Patent metadata

Field	Value
Publication number	US-10020749-B2
Application number	US-201515526223-A
Country	US
Kind code	B2
Filing date	Aug 24, 2015
Priority date	Nov 11, 2014
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

The present invention relates to a power converter including a transformer; a current doubler including a switch element and connected to a secondary side of the transformer to double a current of the transformer according to an operation of the switch element; and a voltage resonator connected to the switch elements, wherein the voltage resonator includes a switch element and a capacitor which are connected to each other in series.

First claim

The invention claimed is:

1. A power converter comprising:
a transformer;
a current doubler configured to double a current of the transformer according to an operation of a first switch element connected to one end of a secondary side of the transformer and a second switch element connected to the other end of the secondary side of the transformer;
a voltage resonator connected to each of the first and second switch elements in parallel; and
a load part that is connected to both ends of the current doubler,
wherein the voltage resonator includes a third switch element, a fourth switch element, a first capacitor, and a second capacitor,
wherein a step-down operation that reduces a level of DC voltage input to an inverter rectification type converter and then outputs the DC voltage from the load part or a step-up operation that increases a level of a DC voltage input to the load part and then outputs the DC voltage from the inverter rectification type converter is performed, and
wherein a current flowing in each of the third and fourth switch elements is resonated when the step-down operation or the step-up operation is performed.

2. The power converter of claim 1 , wherein the voltage resonator includes a first voltage resonator which is connected to the first switch element and a second voltage resonator which is connected to the second switch element, and the first voltage resonator includes the third switch element and the first capacitor which are connected to each other in series, and the second voltage resonator includes the fourth switch element and the second capacitor which are connected to each other in series.

3. The power converter of claim 2 , wherein the first switch element and the third switch element are alternately operated with a dead time, and the second switch element and the third switch element are alternately operated with a second dead time.

4. The power converter of claim 3 , further comprising an inverter rectification type converter which is connected to a primary side of the transformer, converts an input voltage into a square wave pulse waveform and then outputs the converted square wave pulse waveform to the primary side of the transformer.

5. The power converter of claim 1 , wherein the current doubler includes first and second inductors each of which one terminal is connected to each other, and the other terminal of the first inductor is connected to one terminal of the secondary side of the transformer, and the other terminal of the second inductor is connected to the other terminal of the secondary side of the transformer, and a current flowing in each of the first and second inductors and a resonant current flowing in the fourth switch element flow in the first switch element when the step-down operation or the step-up operation is performed.

6. The power converter of claim 5 , wherein, when the step-down operation or the step-up operation is performed, the first and fourth switch elements are connected, and the second and third switch elements are disconnected, and thus the current flowing in each of the first and second inductors and the resonant current flowing in the fourth switch element flow in the first switch element.

7. The power converter of claim 1 , wherein a voltage applied to both ends of each of the first and second voltage resonators has a sine wave when the step-down operation is performed.

8. The power converter of claim 1 , wherein the current doubler includes first and second inductors each of which one terminal is connected to each other, and the other terminal of the first inductor is connected to one terminal of the secondary side of the transformer, and the other terminal of the second inductor is connected to the other terminal of the secondary side of the transformer, and a current flowing in each of the first and second inductors and a resonant current flowing in the third switch element flow in the second switch element when the step-down operation or the step-up operation is performed.

9. The power converter of claim 8 , wherein, when the step-down operation or the step-up operation is performed, the second and third switch elements are connected, and the first and fourth switch elements are disconnected, and thus the current flowing in each of the first and second inductors and the resonant current flowing in the third switch element flow in the second switch element.

10. A power converter comprising:
an insulation transformer;
fifth and seventh switch elements connected between one terminal of a secondary side of the insulation transformer and a first node;
a first inductor connected between one terminal of the secondary side of the insulation transformer and a second node;
a second inductor connected between the other terminal of the secondary side of the insulation transformer and the second node;
a first resonator connected to the fifth switch element in parallel and including a sixth switch element and a first capacitor; and
a second resonator connected to the seventh switch element in parallel and including an eighth switch element and a second capacitor.

11. The power converter of claim 10 , wherein each of the fifth to eighth switch elements includes an internal diode and an internal capacitor.

12. The power converter of claim 10 , wherein the fifth to eighth switch elements are MOSFET transistors, and drain terminals of the fifth and seventh switch elements and source terminals of the sixth and eighth switch elements are commonly connected to one terminal of the insulation transformer.

13. The power converter claim 10 , wherein the sixth switch element and the first capacitor are connected in series, and the eighth switch element and the second capacitor are connected in series.

14. The power converter of claim 13 , further comprising an inverter rectification type converter which is connected to a primary side of the insulation transformer, converts an input voltage into a square wave pulse waveform and then outputs the converted square wave pulse waveform to the primary side of the transformer.

15. The power converter of claim 14 , wherein the inverter rectification type converter is a full bridge circuit including first to fourth switch elements.

16. The power converter of claim 15 , further comprising a load capacitor which is connected between the first and second nodes.

17. The power converter of claim 16 , wherein a step-down operation which reduces a level of a DC voltage input to the inverter rectification type converter and then outputs the DC voltage from the load part or a step-up operation which increases a level of a DC voltage input to the load part and then outputs the DC voltage from the inverter rectification type converter is performed.

18. The power converter of claim 14 , further comprising a primary side inductor which is connected to the primary side of the insulation transformer.

Assignees

• Lg Innotek Co Ltd

Inventors

• Jin Chunfeng
• Kang Joo Suk
• Lee Jae Sam
• Choi Jung Hwan
• Huh Dong Young

Classifications

• H02M1/08

  Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters · CPC title

• H02M2001/0058

  Electricity · mapped topic

• H02M3/33546 Primary

  with automatic control of the output voltage or current (H02M3/33561 takes precedence) · CPC title

• H02M1/0054

  Transistor switching losses (periodically suspending operation of switching converter in low power mode H02M1/0035) · CPC title

• H02M1/0058

  by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero (using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826) · CPC title