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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.
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.
신현학(Hyun-Hak Shin),차헌녕(Hon-Nyong Cha),김흥근(Heung-Geun Kim) 전력전자학회 2013 전력전자학회 논문지 Vol.18 No.4
This paper proposes a performance improvement of existing single-phase current-fed qZ-Source inverter. Voltage gain of the traditional voltage-fed full-bridge inverter and single-phase current-fed qZ-source inverter is only equal to or smaller than input voltage. The proposed inverter can obtain twice higher voltage gain than the single-phase current-fed qZ-Source inverter by adding an extra switch and a capacitor in the circuit. In addition, the proposed inverter shares the common ground between dc input and ac output voltage. Therefore, the proposed inverter can eliminate the possible ground leakage current problem when it is used for grid-tied photovoltaic inverter system. A 120 W prototype inverter is built and tested to verify performances of the proposed inverter.
결합 인덕터를 이용한 2상 양방향 비반전 벅-부스트 컨버터
채준영(Jun-Young Chae),정승용(Seung-Yong Jeong),차헌녕(Hon-Nyong Cha),김흥근(Heung-Geun Kim) 전력전자학회 2014 전력전자학회 논문지 Vol.19 No.6
This study proposes a two-phase non-inverting buck-boost converter that uses a coupled inductor. The multi-phase converter has many advantages over single-phase counterparts, such as reduced output current ripple and conduction loss in switching devices and passive elements. Although the output current ripple of the multi-phase converter is reduced significantly because of the interleaved effect, the inductor current ripple is not reduced in multi-phase converters. One of the solutions to this problem is to use a coupled inductor. A 4 kW prototype converter is built and tested to verify the performance of the proposed converter.