Soft switch resonance type DC-AC inverter circuit

Abstract

Then invention pertains to a resonant soft switching DC-AC inverter circuit, comprising an inverter bridge consisting of four electronic switching tubes, a resonance circuit which is formed by connecting the midpoints of series branches formed by the series connection of an inductor and two equivalent capacitors as well as series branches formed by the series connection of two electronic switching tubes; each electronic switching tube is connected in series with a diode and a margin resonance capacitor. When in work and no matter being in the forward energy transfer process or backward energy transfer process, the electronic switching tubes that conduct high frequency power conversion work in a soft switching way, thus reducing the working loss of the circuit greatly, enhancing the transfer efficiency of the circuit and the working reliability of the switching tubes, effectively eliminating the strong electromagnetic interference caused by hard switching, minimizing the volume, reducing the weight and lowering the cost; furthermore, as the resonance circuit always remains in the resonance state in work, the power conversion capability of the circuit is improved greatly, thus providing higher efficiency, lower interference and higher reliability.

Description

technical field [0001] The invention relates to a DC-AC inverter circuit with bidirectional energy transmission capability, in particular to a soft-switching resonant DC-AC inverter circuit with bidirectional energy transmission capability. Background technique [0002] In the inverter technology, the high-performance inverter circuit with bidirectional energy transmission capability has the most application value. In the existing technology, the most widely used DC-AC inverter circuit with bidirectional energy transmission capability has a far-reaching impact on the market, as attached figure 1 As shown, it includes: [0003] One consists of four electronic switch tubes (T 3 ’, T 4 ’, T 5 ’, T 6 ’) composed of an inverter bridge, each electronic switching tube has a diode connected in parallel with it; [0004] A series branch consisting of an inductor L' and a capacitor C' connected in series; [0005] One consists of two electronic switch tubes (T 1 ’, T 2 ') A s...

AI Technical Summary

Problems solved by technology

[0010] Obviously, whether such an inverter circuit is working in the Buck mode of forward energy transmission or in the Boost mode of reverse energy recovery, the electronic switching tubes responsible for high-frequency power conversion are all working in a hard switching mode. , due to the large operating loss of hard switching, low conversion efficiency, high current and voltage stress of circuit components, resulting in low reliability of the circuit, especially the large electromagnetic interference formed by hard switching, which seriously affects its own control and the work of surrounding electronic equipment Safety

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