Abstract：Nowadays, the point-of-load (POL) converters are Buck, Boost and other PWM DC-DC converters. The inductor exists in their power loop and the dynamic performance is limited. Based on the ZVS self-driven non-isolated full-bridge converter, this paper proposes a novel flyback switching capacitor PWM DC-DC converter. The converter is the combination of a switching capacitor converter and a PWM converter, and it has both good transient performance and regulated output voltage. Besides, it has the following advantages: ①The switches realize zero voltage switching. ②An additional transformer winding self-driven method is applied to reduce the drive loss and the synchronous rectifier body diode conduction loss. ③Its efficiency is not sensitive to leakage inductor, so that the ordinary discrete transformer which is easy to install can be used to save the cost. ④Single phase option makes it more flexible. Its derivation, operation principle and self-driven method are presented. A single-phase 700kHz 1.2V/35A output POL prototype was built to verify the analysis.
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2013, Vol. 28 
