Bidirectional PFC soft switch and control method thereof

Abstract

The invention relates to a bidirectional PFC soft switch and a control method thereof, and belongs to the field of a circuit topology. The bidirectional PFC soft switch and the control method thereof,which are used for improving the integral efficiency of a converter, are provided. The bidirectional PFC soft switch comprises a main loop and an auxiliary branch, wherein the main loop comprises a first switch tube S1, a second switch tube S2, a first resonant capacitor C1, a second resonant capacitor C2, an inductor L, a first filtering capacitor Co1 and a second filtering capacitor Co2, the auxiliary branch comprises a third switch tube S3, a fourth switch tube S4, a resonant inductor Lr, a transformer T and a full-bridge rectification bridge, the main loop is a bidirectional half-bridge PFC converter, soft switching of the main loop under a boost mode or a buck mode is assisted to be completed by the auxiliary branch, and soft switching of a switch tube of the auxiliary branch is alsoachieved.

Description

technical field [0001] The invention discloses a bidirectional PFC soft switch and a control method thereof, belonging to the technical field of power electronic circuit topology. Background technique [0002] In recent years, with the country's increasing emphasis on energy utilization and consumption, people have put forward higher requirements for power systems, and DC power converters play an indispensable role. Power systems capable of charging and discharging are widely used in many industries supported by the state, such as electric vehicles, uninterruptible power supplies, photovoltaic power generation, aviation power and other occasions, requiring energy to flow freely in both directions, which makes the application prospects of bidirectional converters more promising. widely. The high frequency of the bidirectional converter is the direction of its development. The high frequency makes the converter miniaturized, especially in the application of high-tech fields, ...

AI Technical Summary

Problems solved by technology

[0004] Although the above methods based on soft switching technology can successfully solve the energy loss problem of the main circuit, the energy in the added auxiliary circuit cannot be fed back to the input or output. There is no reduction in energy loss; in addition, the auxiliary switching tube is turned on and off in the case of hard switching, and the switching loss is relatively large

Therefore, the overall efficiency of the system is still not improved

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