A novel high frequency current-driven synchronous rectifier for low voltage high current applications

A novel current-driven synchronous rectifier is presented in this paper. With the help of a current sensing energy recovery circuit, the proposed current-driven synchronous rectifier can operate at high switching frequency with high efficiency. Compared with those voltage-driven synchronous rectification solutions, this current-driven synchronous rectifier has several outstanding characteristics. It can be easily applied to most switching topologies like an ideal diode. Constant gate drive voltage can be obtained regardless of line and load fluctuation. Converters designed with this synchronous rectifier are also capable of being connected in parallel without taking the risk of reverse power sinking. The principle of operation is given in the paper. A series of experiments verify the analysis and demonstrate the merits.