| 摘要 |
In the DC-DC converter according to the present invention, an intermediate tap is provided in the free-wheel inductor; the free-wheeling current goes out through the tap. The switch at the main switch side is driven by an N-channel FET (NPN transistor) and a pulse transformer, or the switch constitutes a P-channel FET (PNP transistor), so that the driving circuit at the rectifying side can be made simple. Further, the DC-DC converter includes loss-less snubber circuits or a soft switching circuit having a sub-switch in order to absorb and recover the surge energy from a leaked inductance, which is generated by the addition of the intermediate tap. Moreover, the driving circuit for the soft switching circuit is also simplified.
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