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최민환(Min-Whan Choi),신동석(Dong-Seok Shin),이동호(Dong-Ho Lee),박종연(Chong-Yeun Park) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.6
Conventional EMI filters have tried to use an active EMI filter as a series by the series connection of two EMI filters for CM and DM noise. However, the proposed filter is formed into one circuit by using the active EMI filter which is able to filter CM and DM noise components together. As a result, the active EMI filter showed the outstanding quality in mass and volume under 50% and electric characteristics have been compared to the passive EMI filter in approximately 150kHz~10MHz. Furthermore, the proposed circuit has simple circuit components by comparing with the series EMI filters, and electrical characteristics are similar. The noise have been attenuated to maximum 20dBuV.
이동호(Dong-Ho Lee),최민환(Min-Whan Choi),박종연(Chong-Yeun Park) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.2
Recently, LED is being used as various applications such as home lightings, work lightings and so on. EMI noise generated from LED driver have become a problem according to increase the use of LED. In this paper, Active EMI filter composed active and passive components is discribed as a method of solving a problem of EMI. The proposed filter is applied to the 160W LED load to verify performance experimentally. To compare the performance, We did an experiment using the proposed filter and the passive filter on the same 160W LED load and Driver System. As a result, The proposed Active EMI filter attenuated Conduction EMI noise better than any existing passive filter.
마이닝 시스템을 위한 전원 공급 장치의 새로운 역률 제어 기법
이동윤(Dong-Yun Lee),석원엽(Won-Yeop Seok),최민환(Min-Whan Choi),박상호(Sang-Ho Park),황진호(Jin-Ho Hwang),정인학(In-Hak Jeong) 산업기술교육훈련학회 2020 산업기술연구논문지 (JITR) Vol.25 No.1
In this paper, we propose a novel power-factor control technique that regulates the input power factor and output voltage in accordance with the number of GPUs (Graphics Processing Unit) for digital currency mining. This technique is applied in order to control the power factor of the input side of the power supply system and supply power to the mining system. The proposed new power-factor control technique has the advantage of reducing the switching loss of the rectifier side of the power supply for the mining system by controlling the conduction angle through which the current at the input side of the rectifier is conducted. The control principle of the proposed new power-factor control technique is described in detail by applying the technique to a power supply of a mining system consisting of a plurality of GPUs, and its validity is verified through numerous simulations.