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A high step-up converter with a coupled inductor and a switched capacitor is proposed in this paper. By using the coupled inductor, the voltage gain of the converter is extended and the voltage stress of the main switch is decreased to reduce the conduction losses. Moreover, the reverse-recovery problem of the output diode is alleviated by the leakage inductance. By using the switched capacitor, the...
Coupled inductor is one of the main components in power electronics circuits, which plays an important role in DC/DC converters. The leakage inductance of the coupled inductors can be employed to control the diode current falling rate and to alleviate the diode reverse-recovery problem. Then, some soft switching solutions are realized by the coupled inductor to reduce the switching losses. Furthermore,...
This paper proposes a push-pull forward three-level converter (PPF TL converter) for high-voltage fuel cell applications. It integrates the advantages of the TL converter and the PPF converter. It can operate at both three-level (3L) mode and two-level (2L) mode, so it is suitable for wide input voltage application, such as fuel cell power system. Half of the switches sustain half of the input voltage...
An interleaved boost converter with winding-coupled inductors is proposed in this paper to extend the voltage gain and to reduce the voltage stress of the switch compared with the conventional interleaved boost converter for high step-up distributed fuel cell generation system. Only one set of active clamp circuit is necessary for the interleaved two phases to recycle the leakage energy and to absorb...
The narrow turn-off period of the conventional boost converters limits their applications in high step-up DC-DC conversion. The voltage gain is extended without an extreme duty-cycle by the winding-coupled inductor structure. However, the leakage inductance induces large voltage spikes when the switch turns off. An active-clamp circuit is introduced here to clamp the switch turn-off voltage spikes...
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