Generalized Self-Driven AC-DC Synchronous Rectification Techniques for Single- Multi-Phase Systems

摘要

This paper extends the single-phase self-drivensynchronous rectification (SDSR) technique to multiphaseand multi-level AC-DC systems. Power MOSFETs witheither voltage or current-self-sensing and self-driven gatedrives are used to replace diodes in the rectifier circuits. Thegeneralized methodology allows multiphase SDSRs to bedesigned to replace multiphase diode recliners. Unliketraditional SR designed for high-frequency powerconverters, the SDSR proposed here can be directreplacement of power diode bridges for both low and highfrequency operations. The SDSR utilizes its output devoltage to power its control circuit. No start-up control isneeded because the body diodes of the power MOSFETsprovide the diode rectifier for initial start-up stage. Thegeneralized method is demonstrated in 2kW 1-phase and 3-phase SDSRs. Power loss reduction in the range of 50% to69% has been achieved for inductive, capacitive andresistive loads.