Patent ID: 7193866

Claim:
A half-bridge LLC resonant converter with a synchronous rectification function, comprising: a first switch, being a three-terminal component, with its first terminal coupled to a power input terminal; a second switch, being a three-terminal component, with its third terminal coupled to another power input terminal, and its first terminal coupled to a third terminal of said first switch; a LLC resonant circuit, with a terminal coupled to first switch, and another terminal coupled to another power input terminal; a first transformer, having an elementary coil, a primary coil and a secondary coil, and said elementary coil being coupled to said LLC resonant circuit; a first synchronous rectifier, coupled to said primary coil; a second synchronous rectifier, coupled to said secondary coil; a controller, with its input terminal coupled to another terminal of said primary coil, and its output terminal coupled separately to said first synchronous rectifier and a second terminal of said second synchronous rectifier; and a second transformer, with both terminals of its elementary coil coupled to said output terminal of said controller and both terminals of its primary coil coupled separately to a second terminal and a third terminal of said first switch, and its secondary coil coupled separately to a second terminal and a third terminal of said second switch; such that said controller can control said first synchronous rectifier and said second synchronous rectifier directly, and also can control said first switch and said second switch through the connection with said second transformer directly.