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In this paper, the 120W single stage PFC LED driver with a leakage energy recycling circuit is proposed. Three buck-boost derived converters are integrated and they utilize only one common active switch. The first buck-boost converter regulates the sinusoidal input current with unity power factor drawn from the grid. The second flyback converter controls essentially DC current supplied to the LEDs...
This paper integrates a novel primary-side regulation (PSR) scheme with a single-stage high-power-factor (PF) ac–dc light-emitting-diode (LED) driving circuit. The driving circuit is based on the combination of a buck–boost PF corrector and a flyback converter. The component amount, cost, and size can be significantly reduced by replacing the secondary-side regulation with the PSR. In this way, not...
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