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전계제한테와 측면 유리 절연막 사용한 전력용 p-n 접합 소자의 항복 특성 연구
허창수,추은상 대한전기학회 1996 전기학회논문지 Vol.45 No.3
Zinc-Borosilicate is used as a side insulator wall to make high breakdown voltage with one Field Limiting Ring in a power p-n junction device in simulation. It is known that surface charge density can be yield at the interface of Zinc-Borosilicate glass / silicon system. When the glass is used as a side insulator wall, surface charge varied potential distribution and breakdown voltage is improved 1090 V under the same structure.The breakdown voltage under varying the surface charge density has a limit value. When the epitaxial thickness is varied, the position of FLR doesn't influence to the breakdown characteristic not only under non punch-through structure but also under punch-through structure. (author). 7 refs., 12 figs., 2 tabs.
PWM 정류기를 적용한 직류급전시스템의 전압강하 및 비용 평가
김주락(Joorak Kim),박기준(Kijun Park),박창릉(Chang-Reung Park),추은상(Eun-Sang Choo),이준영(Jun-Young Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.4
Near surface transit system has should be constructed as installation cost of light rail transit with elevated track. So, distance between two substations is longer than conventional system. The long feeding distance results in severe voltage drop. This paper proposes a PWM rectifier instead of diode rectifier. The PWM rectifier has some advantages. This is able to control output voltage constantly to reduce voltage drop and to use regeneration power without additional inverter. This paper analyse on improved voltage profile and cost of substation with PWM rectifier. The analysis of voltage profile use PSIM, and the installation cost of substation with PWM rectifier is compared to substation with diode rectifier.