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In this paper, a novel valley-fill single-stage boost-forward LED driver is presented, where the valley-fill circuit is modified by adding a range-selection switch. The switch is manually closed under low input line and opened under high line to achieve an optimal performance in universal-line range. And the voltage stress of the high-frequency switch under high line range is also reduced. On the...
In this paper, a novel high-voltage gain converter is proposed, which is based on passive clamp coupled inductor, and two voltage double cells are added to extend the voltage gain. The voltage stress on the main switch is reduced with a passive clamp circuit; low on-state resistance of the main switch can be adopted to reduce the conduction loss. Furthermore, zero-current-switching turn-on is achieved...
This paper proposes a novel single-switch dc-dc converter with voltage gain D/(1-D)2 by cascading a Boost converter and a Buck-boost converter. The proposed converter has the advantages of simple circuit structure and extended voltage conversion ratio. The operating principle and steady-state analysis of the proposed converter are discussed in detail. Finally, a prototype is implemented to verify...
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