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권기현(Gie Hyoun Kweon),임영철(Young Cheal Lim),양승학(Seung Hak Yang),정영수(Young Soo Jung) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
The backlight inverter used in a laptop computer is investigated in this paper. It has been difficult for the electromagnetic transformer in the inverter to have a high efficiency and compact profile. In this study, the piezoelectric transformer (PT) is used to reduce the loss and volume compared to the standard electromagnetic transformer. Comparison with the experimental inverter with the PT has been shown to validated the simulation program using the equivalent circuit model of the PT. A simple dimming control circuit was experimentally demonstrated and shown to have broad control.
차현록(Hyun-Rok Cha),서종윤(Jong-Yun Sea),김광헌(Gwang-Heon Kim),임영철(Young-Cheal Lim),장도현(Do-Hyun Jang) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper presents the switching angle and voltage for maximizing torque of 4-phase 6-poles SRM The switching angle and voltage was determined through the approximated analysis and computer simulation by using SIMULlNKiID according to the speed and torque required by load. but we use new analytic equation from maximum torque characteristic. And then one-chip micro-controller controls the switching angle and voltage of an asymmetrical inverter in the SRM driver. Also, we expects that this method reduce micro-controller load and realize approximated real time control
윤진식(Jin-Sik Youn),김기훈(Gi-Hoon Kim),송상빈(Sang-Bin Song),임영철(Young-Cheal Lim) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.12
이 논문에서는 100[W]급 Discrete LED 투광기 조명 제품 개발에 관한 것으로, 3[W] RGBA LED를 이용하여 광색 및 색온도 제어가 가능하도록 광학/방열/회로/시스템 설계를 통한 시제품을 제작하였다. 그 결과, 색온도 2,000~10,000[K] 범위에서 흑체궤적에 정확히 일치하면서 연색지수가 71~91까지 고연색성을 실현하였으며, 동작전압 90~250[Vac], 효율 87[%], 역률 93이상의 양호한 전기적 특성을 나타냈다. 또한 투광기의 협각/중각/광각 배광을 만족하기 위하여 LED 렌즈플 설계하였으며, 신뢰성 확보 및 주위온도에 따른 광출력 변화를 최소화할 수 있는 방열설계를 실시하였다. This papers is about 100[W] discrete LED floodlight lighting system, light color and color temperature to be controlled using the 3[W] HGBA LED, is developed the product with optical, heat dissipation, circuit, luminaire and system design. The result, color temperature is changed corresponding to black body locus from 2,000[K] to 10,000[K] and The Color Hendering Index(C.R.I) is achieved from 71 to 91 by high C.R.I. Driving voltage is 90~250[Vac], circuit efficiency is 87[%], P.F is more than 93. moreover the LED lens is designt to achieve narrow, middle, wide beam angle, heat dissipation design is excuted to minimize variation of luminous output by the surroundings temperature and to ensure reliability.