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The Implication of Synchronous Rectifiers to the Design of Isolated , Single-Ended Forward Converters

Synchronous rectification is a commonly used technique to improve the efficiency of DC/DC converters with low (<=5V) output voltages and high output currents. Control of the synchronous rectifiers in forward converters has been accomplished in many different ways, from self-driven to complexly controlled techniques. Most existing control techniques allow the synchronous rectifier’s body diode to conduct for some small time interval, thus degrading efficiency. The focus of this design review is a new control technique that virtually eliminates body diode conduction in synchronous rectifiers. Measurement results from a 30W resonant reset forward converter will complement the paper.