종래의 thyristor chopper는 reactor가 필수 불가결하여, reactor의 내부저항에 의한 에너지 손실을 피할 수 없다. 본 연구에서는 main thyristor를 commutation하기 위해, commutation capacitor에 충전된 전압을 main thyristor에 역으로 가하여 main thyristor을 commutation하였다. 그 결과 다음과 같은 결론을 얻었다. i) 종래의 thyristor chopper에 필수불가결한 모든 reactor를 제거하여 chopping 작용을 가능케 할 수 있었다. ii) Commutation capacitor에 의해 부하를 통과하지 않고 허비되는 에너지의 67%를 회수할 수 있었다. iii) 본 thyristor chopper의 turn off time은 T=RC ln2에 의해 계산된다

A reverse voltage commutating thyristor chopper was described. The chopper consists of commutating capacitor charging circuit and commutating thyristor. By superimposing the charged voltage on capacitor to load voltage. Powerful reverse voltage could be induced on main thyristor cathode. And in that wise the chopping action was performed without all the reactors of the proposed circuit. An energy recovery circuit was employed in the chopper circuit for recovering the energy that was consumed in main thyristor commutation. The operating principles of the chopper circuit was analyzed and experimental results were as following. I) All reactors were eliminated. ii) By applying energy recovery circuit to the chopper, 67% of the consumed energy was recovered to source. iii) Turn off time of the proposed chopper was derived as T=RC ln2

• 박상길 | Park, Sang-Gil
• 홍봉기 | Hong, Bong-Gi
• 장지원 | Jang, Ji-Won