| 摘要 |
A DC converter alternately turns on and off a main switch Q 1 connected in series with a primary winding P 1 of a transformer T and a sub-switch Q 2 contained in a series circuit connected to each end of the primary winding P 1 of the transformer T or to each end of the main switch Q 1, rectifies and smoothes a voltage of a secondary winding S 1 of the transformer T, and provides a DC output. The DC converter includes a time difference detection circuit 13 to detect an interval between when the main switch Q 1 reaches a minimum voltage after the sub-switch Q 2 is turned off and when the main switch Q 1 is turned on and a first delay circuit 14 to delay the ON timing of the main switch Q 1 according to an output from the time difference detection circuit 13 so that the main switch Q 1 is turned on at around the minimum voltage.
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