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Soft switching implementation method of single-phase high-gain boost converter

An implementation method and high-gain technology, applied in the field of DC-DC conversion, can solve the problems of large switching loss, etc., and achieve the effects of reducing voltage stress, reducing turn-on loss, and reducing energy loss

Inactive Publication Date: 2017-08-22
XIAMEN UNIV +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for implementing soft switching of a single-phase high-gain boost converter that mainly solves the problem of large switching losses during the switching process of the switching tube

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  • Soft switching implementation method of single-phase high-gain boost converter
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  • Soft switching implementation method of single-phase high-gain boost converter

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] see Figure 1~3 , a step-up converter provided by the present invention, comprising a main switching tube S, an auxiliary switching tube S au , a clamping capacitor C C , two feedback diodes D f1 、D f2 , two switched capacitors C f1 、C f2 , an output diode D o , an output capacitor C o and a dual-winding coupled inductor, the primary winding of the coupled inductor n p One end of the power supply V in The positive terminal is connected, and the other end is connected to the drain of the main switch S, the auxiliary switch S au source and the first switched capacitor C f1 Connected to one end; auxiliary switch tube S au The drain and clamp capacitor C C one end of the first feedback diode and the D f1 The anode is connected; the first switched capacitor C f1 the other end of the second feedback diode with the D f2 The anode of the d...

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Abstract

The invention provides a soft switching implementation method of a single-phase high-gain boost converter, and relates to DC-DC conversion. A circuit topology comprises a duplex-winding coupled inductor, two switching tubes and anti-parallel diodes, a clamping capacitor, two switching capacitors, two feedback diodes, an output diode and an output capacitor. By means of cooperation of the duplex-winding coupled inductor and the switching capacitors, high-gain voltage output is achieved. Active clamping of drain source voltage of a main switching tube is achieved through the clamping capacitor, and leakage inductance energy absorbed by the clamping capacitor can be transmitted to an output end. Through optimization of the control sequence of the main switching tube and an auxiliary switching tube, resonance between leakage inductance and parasitic capacitance of the main switching tube and between the leakage inductance and the clamping capacitor is achieved, so that zero voltage switching of the main switching tube and zero current switching and shutdown of the auxiliary switching tube are achieved, and switching loss of the converter is significantly reduced.

Description

technical field [0001] The invention relates to DC-DC conversion, in particular to a method for realizing soft switching of a single-phase high-gain step-up converter. Background technique [0002] Photovoltaic power generation technology, one of the utilization forms of solar energy, has become an important way for people to develop solar energy resources due to its advantages of flexible scale, short construction period and simple maintenance. Centralized large-scale grid-connected photovoltaic power plants have not developed much due to large investment, long construction period, and large area. Distributed grid-connected photovoltaics have become the mainstream of photovoltaic power generation due to their advantages such as small investment, fast construction, and small footprint. However, the output voltage of the distributed power generation module generally does not exceed 50V, and the common DC bus voltage is usually 200V or 400V, so it is necessary to insert a hig...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/158H02M1/0058Y02B70/10
Inventor 何良宗郭栋郑智鹏
Owner XIAMEN UNIV
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