Step-Down Converter With Efficient ZVS Operation With Load Variation

Zero-Voltage-Transition Synchronous DC-DC Converters with Coupled Inductors

“…(17). I LM and V in should be designed for the full load and minimum values of the input voltage, respectively, to achieve ZCS condition at the worst case operating condition.…”

“…The other ZVT technique is applied in [14]- [18] where coupled inductors are used. In [14]- [17], the auxiliary inductor is coupled with the main converter inductor, and the leakage inductor is used as the resonance inductor. Thus, all converter inductors are implemented on a single core, thereby resulting in significant reduction of the converter size.…”

“…Thus, all converter inductors are implemented on a single core, thereby resulting in significant reduction of the converter size. However, using a coupled inductor in [14]- [17] results in increased auxiliary switch voltage stress. In [17], the auxiliary switch is also turned off under a hard switching condition.…”

“…However, using a coupled inductor in [14]- [17] results in increased auxiliary switch voltage stress. In [17], the auxiliary switch is also turned off under a hard switching condition. In [18], a separate core is needed for the coupled inductor, thereby resulting in too many auxiliary elements.…”

“…In the proposed converters, the advantages of the ZVT converters of [13]- [17] are achieved. The SR diode reverse recovery losses are completely eliminated by applying the idea of [13], and soft switching condition is provided for the whole converter operating region without any extra voltage and current stresses on the main and SR switches.…”