| 摘要 |
PROBLEM TO BE SOLVED: To provide a synchronous rectification circuit of a multi-stone type which improves drive efficiency by reducing drive loss. SOLUTION: In the synchronous rectification circuit of a multi-stone type, a part between primary and secondary is insulated, and a rectification switch is arranged at a secondary side. A primary rectification switch element Q5 constituted of an FET is connected to one end of a secondary winding L5 of a primary side of a main transformer, and a secondary rectification switch element Q7 constituted of an FET is connected to the other end of a secondary winding L7 of a secondary side. Auxiliary windings L6, L8, a series circuit of first resistors R6, R8 and first capacitors C6, C8 and a part between a collector/an emitter of auxiliary switch elements Q6, Q8 are connected in parallel with a part between a source/a gate of the rectification switch elements Q5, Q7. A series circuit of second capacitors C7, C9 and second resistors R7, R9 is connected to a part between a collector of the auxiliary switch elements Q6, Q8 and the first resistors R6, R8, thereby constituting the synchronous rectification circuit. COPYRIGHT: (C)2004,JPO&NCIPI
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