Full-bridge quasi resonant DC-DC converter and driving method thereof

摘要

A full-bridge quasi-resonant DC-DC converter is provided, including a transformer having a primary winding and a secondary winding, a full-bridge converting circuit electrically connected with the primary winding of the transformer, a resonant capacitor provided between the full-bridge converting circuit and the primary winding, a rectifier circuit electrically connected with the secondary winding of the transformer, and a resonant inductor connected in series with the rectifier circuit. Therefore, the full-bridge quasi-resonant DC-DC converter reduces the switching losses of the switching elements and effectively reduces the size of the converter, while increases the conversion efficiency.

主权项

1. A full-bridge quasi-resonant DC-DC converter, comprising:
a transformer including a primary winding and a secondary winding, wherein the secondary winding of the transformer includes two coils connected in series with each other; a full-bridge converting circuit including: a first arm circuit having a first switching element disposed at a first upper arm and a second switching element disposed at a first lower arm and connected in series with the first switching element; a second arm circuit connected in parallel with the first arm circuit, and having a third switching element disposed at a second upper arm and a fourth switching element disposed at a second lower arm and connected in series with the third switching element; an input end; an output end electrically connected with the primary winding of the transformer; and a resonant capacitor provided between the first arm circuit or the second arm circuit and the primary winding; a rectifier circuit electrically connected with the secondary winding of the transformer for rectifying signals generated by the secondary winding to produce output signals, wherein the rectifier circuit is a full-bridge rectifier circuit; a fifth switching element and a sixth switching element connected in series with the fifth switching element, wherein the rectifier circuit is connected in parallel with the fifth switching element and the sixth switching elements and convert the output signals of the rectifier circuit into AC signals through the fifth switching element and the sixth switching element; and a resonant inductor connected in series with the rectifier circuit, wherein the resonant inductor and the resonant capacitor form a resonant circuit.