| 摘要 |
PROBLEM TO BE SOLVED: To provide a synchronous rectification circuit capable of sufficiently assuring a drive voltage of a rectification switch independent of a voltage of a secondary coil. SOLUTION: A primary side is insulated from a secondary side, and the secondary side is provided with a rectification switch SW1. The secondary side is provided with an auxiliary switch Q, a diode D, and an auxiliary coil T3. The gate of the rectification switch SW1 is connected to the emitter of the auxiliary switch Q and the cathode of the diode D. One end of the auxiliary coil T3 is connected to the base of the auxiliary switch Q and the anode of the diode D. One end of a secondary coil T2 is connected to the collector of the auxiliary switch Q while the other end of the auxiliary coil T3 is connected to one end of the secondary coil T2. COPYRIGHT: (C)2004,JPO
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