Self-Driven AC-DC Synchronous Rectifier for Power Application
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Synchronous rectifiers based on the use of power MOSFETs to replace the diodes in reducing the conduction losses have been widely used in low-voltage high-current applications. These techniques are primarily applied to various versions of dc–dc converters such as buck converters, flyback and boost-buck converters, half-bridge converters, and LCC resonant converters. To reduce the cost of the gate-drive circuits, self-driven techniques have been an active research topic in synchronous rectifiers although the gate control integrated circuit for driving synchronous rectifiers is also commercially available.Besides the dc–dc converters, the synchronous rectification techniques have been applied to the three-phase full-bridge ac–dc converter based on a three-phase fully controlled bridge and even to the fie-level converter. While the self-driven technique uses the changing voltage polarity of the coupled windings to control the switching of the power MOSFETs, other techniques tend to use control integrated circuits to provide the gating signals.
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