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코어없는 초박형 PCB 변압기를 이용한 무접점 전력변환 회로
차헌녕(Hon-Nyong Cha),최병조(Byung-Cho Choi),안태영(Tae-Young Ahn) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
A coreless printed circuit board (PCB) transformer is employed in a contactless energy transfer circuit that achieves an efficient power conversion at the presence of a considerable airgap between the source and the load side A half-bridge series resonant converter is selected as the contactless energy transfer circuit, m order to minimize the detrimental effects of large leakage inductance, small magnetizing inductance and poor coupling coefficient of the coreless PCB transformer The operation and performance of the proposed contactless power converter are verified on a 7W experimental circuit that provides an 18V/0.4A output from a 210-370V input source.
PCB 변압기 및 인덕터를 이용한 ZVS Forward DC-DC 컨버터
황선민(Sun Min Hwang),안태영(Tae Young Ahn),최병조(Byung Cho Choi),김희준(Hee Jun Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
In his paper, the principle of using careless printed circuit board (PCB) based transformer in 2.3MHz, l2W class ZVS Forward DC-DC converter has been successfully demonstrated With no core loss, coreless PCB transformer and inductor are found to have favorable characteristics at high frequency operations<br/> The maximum power conversion efficiency is 80%. Even for high operating frequency, an efficiency greater than 70% can be obtained with under 0 7% regulation error.
김수한(Su-Han Kim),차헌녕(Hon-Nyong Cha),김흥근(Heung-Geun Kim),최병조(Byung-Cho Choi) 전력전자학회 2013 전력전자학회 논문지 Vol.18 No.4
In this paper, an improved non-isolated 3-level high step-up boost converter is proposed. By using the well known duality principle, the proposed converter is derived from two-phase buck converter. Compared with the traditional boost converter and 3-level boost converter, the proposed converter can obtain very high voltage conversion ratio and the voltage stress of switching devices and diodes is only 1/4 of the output voltage. A 1 kW prototype converter is built and tested to verify performances of the proposed converter.
정동열(Dong-yeol Jung),홍성수(Sung-Soo Hong),최병조(Byung-Cho Choi),사공석진(Sug-Chin Sakong) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
Two existing continuous-time models for the current-mode control have presented noticeable differences in their small-signal predictions. As an attempt to clarify the origin of these disparities, this paper presents an alternative way of deriving a continuous-time model for the current-model control The results of this paper would provide insights to comprehend the dissimilarity in the modeling method and final results of the earlier models of current-mode control