논문 해외 국제전문학술지(SCI급) High-Efficiency Asymmetrical Half-Bridge Converter With a New Coupled Inductor Rectifier (CIR)
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2019-12
- 저자명 이병희,Han, JK (Han, Jung-Kyu),Kim, JW (Kim, Jong-Woo),Lai, JS (Lai, Jih-Sheng),Moon, GW (Moon, Gun-Woo)
- 학술지명 IEEE TRANSACTIONS ON POWER ELECTRONICS
- 발행처명 IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 5
홈페이지논문 초록 (Abstract)
A conventional asymmetrical half-bridge (AHB) converter is one of the most promising topologies in low-power applications because of the zero-voltage switching (ZVS) of all switches and the small number of components. However, when it operates with an asymmetrical duty ratio, it has a large dc-offset current in the transformer, which increases the size and core loss of the transformer. Moreover, because the dc-offset current decreases ZVS energy for one of the half-bridge switches, it has low efficiency in a light load condition. In addition, because most of the output current is concentrated in high-voltage-rating diodes that have large forward voltage drops, large conduction loss occurs in the secondary rectifier. To solve these problems, a new AHB converter with a coupled inductor rectifier (CIR) is proposed in this paper. By adopting the CIR structure in the AHB converter, the proposed converter not only eliminates the dc-offset current in the transformer, but it also has equalized current stress in the rectifier diodes. As a result, the proposed converter achieves high efficiency in entire load condition, compared to an AHB converter with a full-bridge rectifier. The effectiveness and feasibility are verified with a 250-400 V input and 100 V/200 W output prototype.