| 摘要 |
A forward converter has provided in a primary circuit of a transformer (7) included therein an active clamp circuit comprising an auxiliary coil (9) provided separately from a primary coil (8) of the transformer (7), auxiliary switching element (2) and a capacitor (3), the auxiliary switching element (2) being turned on for a reset period of a main switching element (1) connected in series to the primary coil (8) is turned off, to clamp a voltage across the main switching element (1). Since the operating waveform of the transformer (7) is a square one, a synchronous rectifier is provided in a secondary circuit of the transformer (7) to attain a high efficiency of the forward converter itself. Also, since no isolation element such as a pulse transformer, etc. is required, the forward converter can be designed compact and for higher efficiency and lower cost.
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