Average and small-signal model for asymmetrically-driven double-ended PWM DC-to-DC converters

This paper presents average and small-signal models for a wide class of asymmetrically-driven double-ended (ADDE) pulsewidth modulated (PWM) dc-to-dc converters. In this paper, average models for the primary- and secondary-side circuits, commonly employed to most ADDE converters, are first derived using the circuit averaging technique. The principle of energy conservation is then invoked to systematically incorporate the effects of multiple parasitic resistances. The resulting average models are appropriately assembled to constitute an average model for a specific ADDE converter. Finally, the average model of an ADDE converter is linearized to yield the respective small-signal model. The validity and accuracy of the proposed models are experimentally verified using two prototype ADDE converters.