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A kind of bidirectional PFC soft switch and its control method

A control method and soft switching technology, applied in the direction of output power conversion device, climate sustainability, high-efficiency power electronic conversion, etc., can solve the problems of not reducing energy loss, large switching loss, and not improving overall efficiency, etc.

Active Publication Date: 2020-10-16
ZHONGBEI UNIV
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  • Abstract
  • Description
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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

Method used

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  • A kind of bidirectional PFC soft switch and its control method
  • A kind of bidirectional PFC soft switch and its control method
  • A kind of bidirectional PFC soft switch and its control method

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with the accompanying drawings.

[0054] Such as figure 1 As shown, a bidirectional PFC soft switch (PFC: Power Factor Correction) includes a main circuit and an auxiliary branch, and the main circuit includes first and second switching tubes S 1 , S 2 , the first and second resonant capacitors C 1 、C 2 , inductance L, first and second filter capacitors C o1 、C o2 , the auxiliary branch includes the third and fourth switching tubes S 3 , S 4 , resonant inductance L r , transformer T and full-bridge rectifier bridge;

[0055] The first resonant capacitor C 1 with the first switch S 1 In parallel, the second resonant capacitor C 2 with the second switch S 2 Parallel connection; the first switching tube S 1 The source of the second switch S 2 The drain of the inductor L is connected to one end of the inductor L, and the other end of the inductor L is respectively connected to the positive ou...

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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, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42
CPCY02B70/10
Inventor 苏淑靖
Owner ZHONGBEI UNIV
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