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이유경(Yu-Kyeong Lee),정인성(In-Sung Jeong),최효상(Hyo-Sang Choi) 대한전기학회 2015 전기학회논문지 Vol.64 No.4
In this paper, the shield plate was applied to the wireless power transfer (WPT) system. Then we compared transmission efficiency of WPT system between transmitter and receiver coils. The superconductor coil was applied to transmitter and receiver coils in order to increase the transmission efficiency of WPT. The superconductor coil was more effective to power transmission as its current density was higher than normal conductor coil. Efficiency of WPT between transmitter and receiver coils was changed by a quality of shielding. We used the shielding materials such as glass, iron, steels, aluminum etc. The efficiency of WPT system was depended on the shielding materials of transmitter and receiver coils. As a result, magnetic material such as aluminum, iron reduced the magnetic flux density and the efficiency of WPT. remarkably, but in non-magnetic material such as glass and plastic, the efficiency of WPT was unaffected.
정인성 ( In Sung Jeong ) 조선대학교 공학기술연구원 2014 공학기술논문지 Vol.7 No.1
본 논문에서는 계통에서 가장 많이 발생 할 수 있는 지락사고를 발생시켜 사고전류의 제한특성을 분석하였다. 분석결과 사고 후 제한된 사고전류는 초전도한류기를 적용할 경우와 크게 다르지 않는 것으로 나타났다. 또한 인터럽터의 동작시간도 짧기 때문에 배전계통 적용 시 2차 사고의 예방과 보호기기와 보호협조도 유연할 것으로 분석되었다.
Characteristics of Variable Wireless Charging System Applying Superconducting Coils
In-Sung Jeong(정인성),Hyo-Sang Choi(최효상) 대한전기학회 2018 전기학회논문지 Vol.67 No.6
Interest in wireless power transfer (WPT) has been growing recently due to the rapid increase in the use of electronic devices. Wireless charging systems are currently being applied to mobile phones and many studies are being conducted to apply wireless charging systems to various devices. The current wireless charging systems are capable of 1:1 charging. For wireless charging, when the devices with the same resonance frequency are present in the vicinity, the charging efficiency may be significantly lowered due to frequency interference or the wireless charging systems may stop operating. In this paper, variable capacitors were applied to a superconducting WPT system to solve the frequency interference among multiple devices with the same frequency. When a wireless charging system was performing 1:1 operation, the frequency of the other devices was varied using variable capacitors. As a result, it was confirmed that the highly efficient WPT is possible without frequency interference even when multiple receivers are present.
초전도 코일을 적용한 자기공명방식 무선전력전송의 송 · 수신 코일 배열에 따른 효율 분석
강민상(Min-Sang Kang),최효상(Hyo-Sang Choi),정인성(In-Sung Jeong) 대한전기학회 2014 전기학회논문지 Vol.63 No.6
In this paper, we analyzed the efficiency of magnetic resonance wireless power transmission (WPT) using superconductor coil according to the changing position of transmission and receiving coils. We implemented a WPT system using a magnetic resonance at a frequency of 63.1 kHz. Transmission and receiving coils using superconductor coil were wound on a spiral manner of diameter 100mm. For comparison, transmission and receiving coils using normal conductor coil were designed under the same condition. At a distance of 50mm, we measured efficiency when transmission-receiving coils were matched 25%, 50%, 75% and 100%. When a superconductor coil was applied to the transmission and receiving units, efficiency of WPT was very high. In addition, in the case of the superconducting transmission-receiving coils, when coils matched 100% the efficiency was 30% and matched 25% the efficiency was 8%.