| Title |
Single-Power-Conversion Series-Resonant AC-DC Converter with High Efficiency |
| Authors |
Seo-Gwang Jeong ; Woo-Jun Cha ; Sung-Ho Lee ; Bong-Hwan Kwon |
| DOI |
10.6113/TKPE/2016.21.3.224 |
| Keywords |
Single-power-conversion; SEPIC(Single-Ended Primary-Inductor Converter); Voltage doubler; Active-clamp circuit; Series-resonant circuit. |
| Abstract |
In this study, a single-power-conversion series-resonant ac-dc converter with high efficiency and high power factor is proposed. The proposed ac-dc converter consists of single-ended primary-inductor converter with an active-clamp circuit and a voltage doubler with series-resonant circuit. The active-clamp circuit clamps the surge voltage and provides zero-voltage switching of the main switch. The series-resonant circuit consists of leakage inductance Llk of the transformer and resonant capacitors Cr1 and Cr2. This circuit also provides zero-current switching of output diodes D1 and D2. Thus, the switching loss of switches and reverse-recovery loss of output diodes are considerably reduced. The proposed ac-dc converter also achieves high power factor using the proposed control algorithm without the addition of a power factor correction circuit and a dc-link electrolytic capacitor. A detailed theoretical analysis and the experimental results for a 1kW prototype are discussed. |