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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 flicker-free ac/dc LED driver without electrolytic capacitor is presented. The driver comprises a single-stage boost-forward converter and a bidirectional buck-boost converter, which serves to bypass the low frequency ripple. Therefore, electrolytic capacitor is no longer needed. Compared with other electrolytic capacitor-less topologies, the proposed driver has the advantages...
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