Zero-voltage soft-switching single-phase boost inverter and control method

Abstract

The invention belongs to the technical field of inverters, and discloses a zero-voltage soft-switching single-phase boost inverter and a control method. The inverter comprises two auxiliary switch tubes, a first inductor L1, a first bridge arm, a second bridge arm and an auxiliary branch, wherein the two auxiliary switch tubes are conducted in a complementary mode, and the auxiliary branch is composed of a first direct-current bus capacitor Cdc1, a second direct-current bus capacitor Cdc2 and a second inductor L2. In a positive half power frequency period, the first bridge arm works in an SPWMmode, and the second bridge arm works in a PWM mode; and in a negative half power frequency period, the working states of the first bridge arm and the second bridge arm are exchanged. According to the inverter, zero-voltage soft switching of two bridge arm lower tubes and one bridge arm upper tube is realized, the problem of serious reverse recovery loss of an anti-reverse diode in a traditionalintegrated inverter is effectively solved, and the conversion efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of inverters, and in particular relates to a zero-voltage soft-switching single-phase boost inverter and a control method. Background technique [0002] In order to cope with the crisis of traditional fossil energy and environmental pollution, the renewable energy distributed power generation system has been vigorously developed in various countries in recent years. In these power systems, the input side is usually a photovoltaic cell, a fuel cell or a storage battery, and its output voltage is low and has a large fluctuation range. Therefore, distributed power generation systems generally adopt a two-stage structure of DC / DC boost converters (such as Boost) cascaded with voltage source inverters to meet the voltage requirements of the grid or AC load equipment. The two-stage boost inverter scheme can better adapt to the wide variation range of the input voltage, and the control is relatively simple, but th...

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Problems solved by technology

[0003] In view of this, this application provides a zero-voltage soft-switching single-phase boost inverter, which can realize zero-voltage soft switching of two bridge arm lower tubes and one bridge arm upper tube, and effectively solve the traditional The problem of serious reverse recovery loss of the anti-reverse diode in the integrated inverter improves the conversion efficiency

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