Auxiliary resonant pole active clamp three-level soft switching inverter circuit and modulation method

Abstract

The invention provides an auxiliary resonant pole active clamp three-level soft switching inverter circuit and a modulation method thereof. The circuit includes an active clamp main inverter circuit,an auxiliary resonant commutation circuit, a filter circuit, and a load. The active clamp main inverter circuit comprises six switching tubes with anti-parallel diodes and two identical supporting capacitors. The auxiliary resonant converter circuit comprises two auxiliary switching tubes with anti-parallel diodes, two resonant capacitors and one resonance inductor. The filter circuit is an LC filter circuit. The modulation method provided by the invention can realize the zero voltage switch of the main switch tube and the zero current switch of the auxiliary switch tube. The active clamp three-level hard switching loss is reduced, the system efficiency is improved, and the electromagnetic interference is reduced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an auxiliary resonant pole active clamp three-level soft-switching inverter circuit and a modulation method thereof. Background technique [0002] With the continuous development of power electronics technology, the power density of inverters is getting higher and higher, and people's demand for high-frequency, miniaturized, and lightweight high-power inverters is also increasing. As the switching frequency increases, the conventional pulse width modulation technology will face many problems. On the one hand, it will increase the switching loss of the switching tube, and on the other hand, the system will generate electromagnetic interference (EMI) to the outside. [0003] In order to overcome the above problems, since the 1980s, the soft switching technology has been deeply studied, and various topological structures and modulation strategies have been continuously dev...

AI Technical Summary

Problems solved by technology

[0006] 2. The turn-on current of the switch tube of this circuit rises at the rate of the resonant current, and the turn-on loss is relatively large;

[0009] 1. The added double auxiliary resonant commutation circuit uses more devices, which increases the hardware cost;

[0010] 2. There are many auxiliary switching tubes, which increases the difficulty of the modulation method of the auxiliary switching tubes;

[0011] 3. The inverter circuit is aimed at two-level circuits, and it is difficult to apply it to three-level circuits

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