A Highly Efficient SEPIC-Flyback Integrated Converter as an LED Driver
نویسنده
چکیده
Light-emitting diodes (LEDs) have been widely used for various lighting applications. A high power factor single-stage single-switch driver can be used to supply LEDs without using an electrolytic capacitor. By integrating the single-ended primary inductor converter (SEPIC) and flyback converter, LED driver could achieve nearly a unity power factor and low total harmonic distortion (THD). Since leakage energy is absorbed, there are no voltage spikes across the switch when it turns off. The SEPIC circuit is operated at discontinuous conduction mode (DCM) and there is only one active power switch which turns on under zero current switching (ZCS). Operating principles of the driver is discussed in detail. Simulation is done and results are presented to verify the theoretical analysis.
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