Inductance Adjusted Switched Capacitor Passive Clamp Soft Switching High Gain Boost Converter

Abstract

The invention discloses an inductance regulating switch capacitor-type passive clamping soft switching high-gain boost-type converter which comprises a power switch tube, a clamping diode, a rectification diode, a coupling inductor and a regulating inductor and has the following basic functions: the zero-current turning-on of the power switch tube is realized through utilizing the leakage inductance of coupling inductance; the soft turning-off of the power switch tube and lossless transfer of leakage inductance energy are realized through the passive clamping circuit consisting of the clamping diode and a clamping capacitor; the high-gain output of the converter is realized through utilizing a second winding of the coupling inductor and the switch capacitor; the turn ratio of the coupling inductance is prevented from being over-high by utilizing the inductance to regulate and output voltage range; the volume of a magnetic element is reduced by utilizing the bidirectional operation of the magnetic element; the converter is simple in structure, is convenient to control; and loss energy elements are not arranged in the circuit, and the efficiency can be improved. The inductance regulating switch capacitor-type passive clamping soft switching high-gain boost-type converter provided by the invention is mainly applied to the field of renewable energy source and novel energy source power generation with low working voltage level, such as photovoltaic power generation and fuel battery power generation.

Description

technical field [0001] The invention relates to a high-gain DC-DC step-up converter, which realizes passive clamping soft switching through the combination of linear inductors, diodes and capacitors. Background technique [0002] At present, in the known DC-DC conversion technology, the converters that can realize step-up transmission include: Boost chopper, Buck-Boost chopper, Cuk chopper, etc. excitation, flyback, bridge, and push-pull converters, etc. [0003] The output voltage gain of a transformerless or coupled inductance boost converter is small, and the voltage stress of the power switch tube is relatively large. The power switch tube works as a hard switch, and the switching loss is large. In recent years, some soft-switching converters have been studied successively. There are two main types: one is to realize the soft switching of the power switching tube through additional active power switches and passive inductors, capacitors and other devices; the other is t...

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Problems solved by technology

Although these two methods can realize the soft switching of the power switch tube, the external circuit is complicated, and the voltage stress of the power switch tube cannot be reduced, and the high gain function of the converter cannot be realized.

[0004] To achieve high gain in a converter with a transformer or coupled inductor, the primary and secondary sides of the transformer or coupled inductor are required to have a high turn ratio. When the operating voltage difference between the primary and secondary sides of the transformer or coupled inductor is large, the primary side It works in low voltage and high current state; while the secondary side works in high voltage and low current state, which makes the design of transformer or coupled inductor more difficult, and the stray parameters of transformer or coupled inductor have a relatively greater impact on circuit operation

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