Abstract
Increasingly, the operating frequency of switched-mode power supplies (SMPS) eliminates the need for bulky magnetic and output filter components, thereby reducing their overall weight and volume. Power MOSFETs, which are capable of operating at much higher frequencies than those achievable with present-day bipolar transistors, have by now established their credibility in switching-mode power supply applications. In the paper, a fundamentally different scheme of switched-mode power supply, in which the transformer demagnetizing winding (clamping winding) is eliminated by using a simple RC clamping circuit, is discussed. It is shown that this scheme is capable of delivering a steady DC output voltage, under a much wider variation of DC source voltage.
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