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계통 전압 강하에 따른 저전압 상황에서 계통 위상 추정을 위한 PLL 방법
손현수(Hyeon-Su Son),양세동(Se-Dong Yang),김가인(Ga-In Kim),강현식(Hyeon-Sik Kang),신민호(Min-Ho Shin),김미나(Mi-Na Kim),이정효(Jung-Hyo Lee) 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
This paper describes estimating grid phase angle using improved PLL method for low voltage condition according to a grid voltage drop. A reactive power injection is required at situation of a low voltage accident in the interconnecting Distributed Generation System to the grid or a grid voltage drop by recent an electric vehicle charger, and the grid phase angle is required to obtain accurate a dq-transformed reference of voltage and current. In the method of estimating the grid phase, it is difficult to accurately estimate the grid phase in a low voltage condition when using only the existing voltage information.
Heavy Copper IMS 파워 모듈을 이용한 하프브리지 DC/DC컨버터 특성 비교
양세동(Se-dong Yang),손현수(Hyeon-su Son),강현식(Kang hyeon sik),김가인(Ga-In Kim),신민호(Min-Ho Shin),오애선,배현철,이정효(Jung-Hyo Lee) 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
This paper compares the performance of a heavy copper IMS power module with the commercialized silicon Si-based IGBT In order to evaluate the performance of each device, a comparison is performed on the half-bridge DC/DC converter. Si-based IGBT performance evaluation of IGBT and heavy copper IMS, fixed duty ration is applied, the efficiency according to the internal resistance according to the output voltage may be known. Based on this, it was verified through experiments.
김가인(Ga-In Kim),양세동(Se-Dong Yang),손현수(Hyeon-Su Son),강현식(Hyeon-Sik Kang),박영훈(Young-Hoon Park),신민호 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
This paper power supply design and control method of plasma system used in LCD and semiconducter cleaning processes. both poles in the load included capacitors for using a multijet method for increase efficient the cleaning processes. Therefore, Occur unbalanced current at the power supply output current because both poles capacitors. Occured unbalanced current be improved design and control method that using series L and PWM Duty control, its be proved a stable supply of power.
The Electroluminescence of M-SI-SC Model ZnTe
Chung, Choong Hyun,Kang, Hyeon Sik 연세대학교 대학원 1970 延世論叢 Vol.7 No.1
ZnTe:Ag를 생장시켜 한쪽을 In 금속으로 합금층을 이루게 하므로서 금속-반절연체-반도체 모형의, Diode를 만들 수 있었으며, 이것에서 Forward or Reverse의 bias 전압에 대해 초록 및 빨강의 Electroluminscence를 관찰하였다. 발광강도는 전류밀도에 비례하였고, 전류밀도ㆍ전압특성은 space charge limitedcurrent에 대한 Lampert의 이론을 그대로 따르고 있었다. 금속-반절연체-반도체 모형과 자유전자와 자유공공사이의 복사형 재결합으로 인한 발광을 가정하면 분광특성을 설명할 수 있었고 전기용량 측정으로 접합 두께가 2×10-4cm임을 알았다.