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가정용 전기기기에서 발생하는 고장 메커니즘 분석 및 화재ㆍ감전 재현시험
원동조(Dong-Jo, Won),장인혁(In-hyeok, Jang),김준성(Jun-Sung, Kim),이영주(Young-Joo Lee),이창훈(Chang-Hoon, Lee),임홍우(Hong-Woo, Lim) 대한전기학회 2016 대한전기학회 학술대회 논문집 Vol.2016 No.3
Recently, electric appliance has quick response and durable electrical components and there are manufactured by lightweight materials. But company should focus on functional development, unaware of the importance of safety failures in the situation and sell the products. In particular, the electrical failure of the dehumidifier from a wide range of appliances has led to a lot of fore, electric shock and information of accident has not been released to the outside due to secrets of companies. In this paper, confirmed that accident situation analysis the failure mechanism leading to the fire electric shock by dehumidifier and use the aging test which confirmed accident of component units.
원동조(Dong-Jo Won),박상훈(Sang-Hoon Park),박소리(So-Ri Park),이수원(Su-won Lee),원충연(Chung-Yuen Won),정용채(Yong-Chae Jung) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
This paper presents a novel soft switching topology with resonant DC-DC converter and inverter. The resonant DC-DC converter consists of the auxiliary switch, resonant capacitor and inductor. All switches in the proposed topology is turn on at ZCS and turn off at ZVS operation. The proposed soft switching technology can be obtained the reduced switching losses and voltage and current stress of the power devices. Therefore, the resonant converter efficiency is higher than conventional boost converter. Simulation results on a 1kW soft switching converter are presented.
Goertzel 알고리즘을 이용한 새로운 단독운전 방지 기법
원동조(Dong-Jo Won),김재형(Jae-Hyung Kim),김준구(Jun-Gu Kim),원충연(Chung-Yuen Won),이태원(Tae-Won Lee) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.2
In this paper, a novel anti-islanding method of DC-AC single phase inverter is proposed. The inverter injects a little harmonic current with the output current of a PCS(Power Conditioning System). When the islanding condition is occurred, the voltage harmonic components appear on the output voltage of the PCS due to the injection of a little harmonic current. So, the PCS detects the voltage harmonic components using the Goertzel algorithm, and then the PCS decides that the islanding condition is occurred. When the PCS recognizes the islanding condition, the PCS are stopped. The proposed a novel anti-islanding method is analyzed, and its validity is proven through simulation.
원동조(Dong-Jo Won),이주혁(Joo-Hyuk Lee),김재형(Jae-Hyung Kim),원충연(Chung-Yuen Won),정용채(Yong-Chae Jung) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
In this paper, we propose the battery charging device for electric bicycle using photovoltaic power. DC voltage from the solar cells is low, it needs to be step-up by the power conversion device. The power conversion device applied to this paper is phase-shift full-bridge converter. This converter steps-up from 12~22[Vdc] to 36[Vdc] for charging the. battery of electric bicycle. Phase-shift full-bridge converter(PSFB) can obtain twice as much DC voltage compared with half-bridge converter, thus it has lower current stress less than half-bridge converter. It is simulated and tested the battery charging device using photovoltaic power.