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Novel Dummy Load for 40W Fluorescent Lamps
최보환,김현재,여인용,김봉철,임춘택 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.5
A new fluorescent dummy load to replace one of the fluorescent lamps in a dual lamp type rapid-start ballast for halving the lamp power is proposed. Using a circuit composed of a fundamental compensation circuit and a harmonic filter circuit, a new fluorescent dummy load having superior characteristics than a conventional dummy load is developed. The design principle and architecture of the proposed fluorescent dummy load is explained and verified by experiments.
최보환,장기찬,신성민,Soo Ill Lee,강현국,임춘택 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.5
This article proposes a highly reliable power and communication system that guarantees the protection of essential instruments in a nuclear power plant under a severe accident. Both power and communication lines are established with not only conventional wired channels, but also the proposed wireless channels for emergency reserve. An inductivepower transfer system is selected due to its robust power transfer characteristics under high temperature, high pressure, and highly humid environments with a large amount of scattered debris after a severe accident. A thermal insulation box and a glass-fiber reinforced plastic box are proposed to protect the essential instruments, including vulnerable electronic circuits, from extremely high temperatures of up to 627 C and pressure of up to 5 bar. The proposed wireless power and communication system is experimentally verified by an inductive power transfer system prototype having a dipole coil structure and prototype Zigbee modules over a 7-m distance, where both the thermal insulation box and the glass-fiber reinforced plastic box are fabricated and tested using a high-temperature chamber. Moreover, an experiment on the effects of a high radiation environment on various electronic devices is conducted based on the radiation test having a maximum accumulated dose of 27 Mrad.
최보환(Bo-Hwan Choi),서훈철(Hun-Chul Seo),김철환(Chul-Hwan Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
최근의 배전계통의 단거리, 고밀도화 현상은 단시간의 전력품질 문제에 대한 피해를 증폭시키고 있다. 또한 현대의 전기, 전자장비들은 전력품질에 매우 민감하게 동작한다. 따라서 이와 같은 전력품질 문제에 대처하기 위해서 전력계통 과도현상의 정확한 해석이 반드시 필요하다. 본 논문은 전력계통에서 발생가능 한 과도현상 중 과전압 해석을 위한 시뮬레이터를 개발하였다. 시뮬레이터는 송전선로에서의 진행파 이론과 Bewley의 격자도를 통한 해석을 기초로 하여 MATLAB을 이용하여 개발하였다. 시뮬레이터의 실행결과를 검증하기 위하여 EMTP의 시뮬레이션 결과 및 수계산 결과와 비교하였다.