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A Soft Switching of Interleaved Parallel DC-DC Converter

A DC-DC and converter technology, applied in the field of DC-DC converters, can solve the problem that the voltage gain of the converter is not improved, and achieve the effects of high power level, small voltage stress and high voltage gain

Active Publication Date: 2018-09-11
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the voltage stress of the switch tube is still equal to the output voltage, and the voltage gain of the converter has not been improved

Method used

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  • A Soft Switching of Interleaved Parallel DC-DC Converter
  • A Soft Switching of Interleaved Parallel DC-DC Converter
  • A Soft Switching of Interleaved Parallel DC-DC Converter

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] see figure 1 , a kind of soft-switching high-gain DC-DC converter provided by the present invention comprises two power transistors (S 1 , S 2 ), two snubber capacitors (C S1 、C S2 ), two auxiliary switches (S r1 , S r2 ), two resonant inductors (L r1 , L r2 ), two resonant capacitors (C r1 、C r2 ), two clamping diodes (D C1 、D C2 ), two clamp capacitors (C C1 、C C2 ), two freewheeling diodes (D f1 、D f2 ), two switched capacitors (C f1 、C f2 ), two output diodes (D o1 、D o2 ), an output capacitor (C o ) and two three-winding coupled inductors, characterized by the primary winding of the first coupled inductor (L 1p ) and the primary winding of the second coupled inductor (L 2p ) and one end of the power supply (V in ) is connected to the positive end, and the other end is connected to the first power tube (S 1 ), the drain...

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Abstract

A soft switch of an interleaved parallel DC-DC converter relates to a DC-DC converter. It is equipped with power supply, output capacitor, power switch tube, freewheeling diode, absorbing capacitor, clamping capacitor, auxiliary switch, resonant inductor, resonant capacitor, switched capacitor, output diode, first coupling inductor and second coupling inductor; the first coupling The inductor and the second coupled inductor are three-winding coupled inductors, and the three-winding coupled inductor includes a primary winding, a first secondary winding, and a second secondary winding. Realize the zero-voltage turn-on and zero-voltage turn-off of the power switch tube, with automatic current sharing capability, use the leakage inductance of two three-winding coupled inductors to control the current drop rate in the diode, and solve the reverse recovery problem of the diode when it is turned off. The second and third windings of the three-winding coupled inductor are used to realize the high-gain output of the converter, and two switched capacitors are used to expand the voltage output of the converter, reducing the voltage stress of the power device, with small power loss and simple structure.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a soft switch of an interleaved parallel DC-DC converter. Background technique [0002] With the increasing energy and environmental issues, photovoltaic cells, fuel cells and other new energy grid-connected power generation technologies have received widespread attention. However, the output voltage levels of photovoltaic cells and fuel cells are relatively low, which cannot meet the power supply requirements of existing electrical equipment, and cannot be connected to the grid. Therefore, it is necessary to insert a high-gain, high-efficiency High performance DC-DC converter with input current ripple. In order to effectively improve the voltage gain of the DC converter, many scholars have proposed a variety of converter topologies with high boost function. The circuit of the flyback converter is simple, and a high voltage gain can be achieved by adjusting the turn ratio of the flyback tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/1584H02M1/0058H02M3/1586Y02B70/10
Inventor 何良宗廖育贤程琛
Owner XIAMEN UNIV
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