Abstract
A single-switch ac-dc light-emitting-diode (LED) driver based on boost-flyback power factor correction (PFC) converter with a lossless snubber is proposed. In the proposed LED driver, the boost PFC module is designed to be operated in the discontinuous-conduction mode to achieve a high power factor. The dc-dc flyback module is designed to provide input-output electrical isolation to improve safety. The lossless snubber circuit clamps the peak voltage spike of switch to a low voltage and the leakage inductor energy is recycled via the dc-dc flyback module. Additionally, a low-voltage-rating capacitor can be used as the dc-bus capacitor because some of the input power is directly conducted to the output; the remaining power is stored in the dc-bus capacitor. Therefore, the proposed LED driver can provide a high power factor and a high power conversion efficiency. These results are verified for an output of 48 V and 2 A for the experimental prototype.
| Original language | English |
|---|---|
| Article number | 7445214 |
| Pages (from-to) | 1375-1384 |
| Number of pages | 10 |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 32 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 2017 |
Keywords
- Boost-flyback converter
- LED driver
- lossless snubber
- power factor correction (PFC)