| 摘要 |
In a power supply circuit designed so that an AC voltage is applied to the primary side of a transformer, and that the voltage derived on the secondary side thereof is rectified and smoothed, arrangement is provided that the AC voltage applied to the primary side is subjected to switching at least twice in each half cycle thereof to insure that the current which flows on the primary side is timewisely divided, whereby the peak value of the current flowing on the primary side of the transformer is suppressed to a small level. Thus, it is possible to realize a substantial reduction of noises as a result of minimized dI/dt and current value and also to realize a substantial reduction of power loss as a result of minimized current value.
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