Zero-voltage switch full-bridge direct current converter

A zero-voltage switching, DC converter technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, high-efficiency power electronic conversion, etc., can solve the problem of increasing the size and cost of the converter, increasing the output filter capacitor, clamp Diode damage and other problems, to achieve the effect of eliminating voltage oscillation, reducing current, and eliminating loss
CN1937381AInactive Publication Date: 2007-03-28NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2007-03-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

This DC converter belongs to the energy converter and consists of the DC power supply (Vin), two inverter bridge arms, the resonance inductance, the isolation transformer and the rectifier / filter circuit. Its character lays on that; there is an auxiliary winding (n3) in the isolation transformer beside the primary and the secondary windings (n1, n2). One end of n3 is connected to n1 and to two clamp diodes from the joint point to form a clamping circuit. Another end of n3 is connected to the resonance inductance. This converter realizes the zero voltage switching on the rectifier. This can eliminate the voltage oscillation induced by the reverse restoration of the output rectifier. It decrease the voltage stress across the output rectifier and reduces rapidly and effectively the currents through the clamping diodes. All these raise the conversion efficiency and improve the work condition of clamping diodes during light load.
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Description

1. Technical field

[0001] The zero-voltage switching full-bridge DC converter of the invention belongs to the DC converter of an electric energy conversion device. 2. Background technology

[0002] In medium and high power DC conversion occasions, the full bridge converter has been widely used because the switching tube is easy to realize soft switching and adopts constant frequency control. In the past two decades, there have been many soft-switching control strategies and circuit topologies for full-bridge converters. Both the phase-shift control zero-voltage switching full-bridge converter and the phase-shift control zero-voltage zero-current switching full-bridge converter can realize the soft switching of the switching tube. However, whether it is a zero-voltage switching or zero-voltage zero-current switching full-bridge converter, due to the reverse recovery of the secondary rectifier diode, the leakage inductance of the transformer (or the additional resonant induct...

Claims

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