Abstract
In this paper, a soft-switching buck power-factor-correction (PFC) converter for a high-efficiency AC-DC light-emitting-diode (LED) driver is proposed. By replacing a freewheeling diode with a self-driven synchronous rectifier (SR), efficiency improvement is achieved due to the reduced conduction loss on the SR. In addition, there is no switching loss on switching devices because zero-voltage-switching (ZVS) operations of both switches are easily performed. Since the SR is self-driven without an additional control circuit, the proposed converter has competitive price. In order to verify efficiency improvement of the proposed converter, it is compared with a conventional critical-conduction-mode (CRM) buck PFC converter. The efficiency of the proposed converter is measured maximum 95.61% at 170 [Vac] and improved maximum 0.23% at 240 [Vac]. For verifying soft-switching and efficiency improvement of the proposed converter, theoretical analysis, design consideration, and experimental results from a 48 [V] and 1.4 [A] prototype for a high-efficiency LED driver are presented.
| Original language | English |
|---|---|
| Pages (from-to) | 1647-1655 |
| Number of pages | 9 |
| Journal | International Review of Electrical Engineering |
| Volume | 8 |
| Issue number | 6 |
| State | Published - Dec 2013 |
Keywords
- Buck Converter
- LED Driver
- Power-Factor-Correction (PFC)
- Synchronous Rectifier
- Zero-Voltage-Switching (ZVS)