Single-stage voltage regulation conversion circuit sharing rectification structure and control method

Abstract

The invention provides a single-stage voltage regulation conversion circuit sharing a rectification structure and a control method. The system comprises a direct-current power supply, a capacitance voltage division module, a resonance module, an alternating-current filtering module, an energy storage inductor, a first transformer, a second transformer, a first electric energy adjusting inversion module, an electric energy adjusting rectification module, a second electric energy adjusting inversion module, a load module and a main controller. According to the method, the voltage regulation function can be achieved while efficient energy transmission is achieved; and an LLC circuit and a DAB circuit share a secondary side rectifying circuit, the number of switching devices can be reduced, the efficiency of the circuit is further improved, and the cost of the circuit is reduced. A phase shift control mode is adopted, and power transmission is adjusted while all switching tubes are guaranteed to be switched on at zero voltage by controlling the phase shift angle between bridge arms.

Description

technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a single-stage voltage regulation conversion circuit and a control method with a common rectification structure. Background technique [0002] In recent years, LLC resonant converters have been widely used in high-efficiency isolation application scenarios due to their high efficiency and isolation circuit characteristics, such as photovoltaic energy storage, new energy vehicles, solid-state transformers, and low-voltage high-current applications. When the LLC resonant converter operates at the resonant frequency, it can obtain the zero-voltage turn-on (ZVS) of the primary side switch and the zero-current turn-off (ZCS) of the secondary rectifier diode, so that the highest energy conversion efficiency can be obtained. However, when the operating point of the circuit deviates from the resonant operating point, the transformer circulating current of the LLC reso...

AI Technical Summary

Problems solved by technology

However, this circuit structure has more switching tubes, which will lead to an increase in the on-state loss of the circuit, and thus cannot further improve the efficiency of the circuit.

At the same time, if a discrete transformer is used, the overall volume of the device will increase, and the core loss will increase.

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