Differential decompression DC chopper type high-frequency chain inverter

Abstract

The invention relates to a differential buck-boost direct current chopper type high frequency link inverter which is provided with a circuit consisting of two same high frequency electric insulation bidirectional buck direct current choppers which output low frequency positive half cycle unipolar sine pulse width modulating voltage wave and low frequency negative half cycle unipolar sine pulse width modulating voltage wave respectively in the form of differential circuits. Capacitance filters and LC filters are connected between an output end of a differential chopper and an output load and between an input direct current power supply and an input end of the differential chopper. The high frequency link inverter can transform an unstable direct current voltage into a required stable good-quality sine alternating current voltage, the high frequency link inverter has the advantages of high frequency electric isolation, strong matching ability of input voltage and output voltage, simple circuit topology, single stage power transformation, bidirectional power flow, high power density, high transformation efficiency, strong load adaptability, low audio frequency noise, the high reliability during load short circuit, low cost, wide application prospects and the like and provides the key technology for a novel small capacity inverter power supply and a static convertor.

Description

technical field [0001] The invention relates to a differential buck-boost (Buck-Boost) DC chopper type high-frequency link inverter, which belongs to the technical field of power electronic conversion. Background technique [0002] The inverter is a static conversion device that uses power semiconductor devices to convert direct current into alternating current for use with alternating current loads. An inverter with high-frequency electrical isolation between the output AC load and the input DC power supply is called a high-frequency link inverter. The high-frequency electrical isolation components mainly play the following roles in the inverter: 1) realize the electrical isolation between the output and input of the inverter, and improve the safety, reliability and electromagnetic compatibility of the inverter operation; 2) realize The matching between the output voltage and the input voltage of the inverter is achieved, that is, the technical effect that the output volta...

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Problems solved by technology

Therefore, the conversion efficiency of the high-frequency link inverter is not ideal, the fundamental reason is that it belongs to the cascaded two-stage circuit structure

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