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비자성 유도가열시스템을 위한 IGBT를 이용한 고속스위칭 구동에 관한 연구
김정태(kim Jeong-Tae),권경안(Kwon Kyung-Ahn),정윤철(Jung Yun-Cheol),박병욱(Park Byoung-Wook) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
A new high frequency switching drive method using IGBT is proposed for non-magnetic induction heating system, Using this method, the switching and conduction losses of the switching devices can be reduced. In addition, since IGBT cost is lower than MOS-FET one, the system cost can be remarkably pared down. The prototype induction heating system with 1.2㎾ power consumption is builted and tested to verify the operation of the proposed high frequency switching drive method.<br/>
박병욱(Park Byeong-Wook),권경안(Kwon Kyung-Ahn) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
In this paper, the inverter air-conditioner with Power Factor Correction(PFC) circuit is presented for obtaining the good system efficiency and cost merit compared with the conventional inverter air-conditioner. The detailed design procedures for getting the optimal passive components are implemented. Through the simulation and experimental results, it is shown that the system efficiency can be improved. Using the designed components, the proto type system is builted and tested to verify the additional good performances of the proposed circuit.<br/>
정용채(Jung Yong-Chae),권경안(Kwon Kyung-Ahn) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
In this paper, a Single-phase Active Rectifier (SAR) with high power factor capability for inverter air-conditioner is adopted for satisfying the international standards of input current harmonics, IEC 1000-3-2. Comparing the conventional boost power factor correction circuit, one diode drop is reduced in the power flow path of the SAR circuit, so the system efficiency is improved. To apply the control IC, such as UC3854, ML4821 and so forth, to the SAR, the adequate sensing circuits are proposed. The design rules of passive components and two control loops are also presented. The proto-type SAR circuit with 3㎾ power consumption is builted and tested to verify the operation of the proposed circuit.<br/>
박진호(Jin-Ho Park),권경안(Kyung-Ahn Kwon),정은희(Eun-Hee Jung),김재광(Jae-Kwang Kim),김지영(Ji-Young Kim),오조교(Jo-Kyo Oh) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.5
This study was investigated on pH, heavy metals, oils and solvents in 34 surface soil samples and the samples are collected at two times for 17 farmland sites around 7 industrial areas in Northern Gyeonggi Province. As a result of pH for soil contamination monitoring network, the range of pH showed 4.4~8.4 and average was 6.3. The range of pH for Agricultural land around industrial area was 6.7~7.5 and average indicated 7.1 that mostly showed neutral condition in this area. he average concentrations of Cu, Pb, Ni, As and Cr are lower than Korea soil contamination worrisome levels at region 1 and the mean levels of farmland from the soil quality monitoring network. The average concentrations of Zn, Cd and Hg didn’t exceed the soil contamination worrisome levels at region 1 but slightly higher than the mean levels of farmland from the soil quality monitoring network. The heavy metal levels of all samples are within Korea soil contamination worrisome levels at region 1. The results showed that the detected heavy metal concentrations ranged from N.D. to ~32.7% of Korea soil contamination worrisome levels at region 1. BTEX, TPH, TCE and PCE were not detected in all samples and thus the farmland around the industrial areas were free from oils and solvents contamination.
정용채(Jung Yong-Chae),정윤철(Jung Yun-Cheol),권경안(Kwon Kyung-Ahn) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
In this paper, the power factor correction circuit using a parallel drive method is proposed so that the high power inverter air-conditioner with 3[hp] compressor motor may obtain the cost down and the improved performance. The adequate design procedures are presented to reduce the material costs by eliminating the power factor improving LC filter and derating output capacitor and inverter switches. Using the determined components, the proto-type circuit with 6[kw] power consumption is built and tested to verify the operation of the proposed circuit.