• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.59-60
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• 2015

Wireless power transfer is a technique that supplies the necessary power to the various electronic devices over the air without wires. The technology is classified as near-field wireless power transfer technology using inductive coupling and far-field wireless power transfer technology using antenna. In this paper, RTLS tag for high-precision positioning and wireless power transfer module was designed in order to solve the power supply problem for facility management. was designed for high-precision positioning is possible RTLS tags and wireless charging. The wireless charging pad provides the capability to charge up to four devices using he magnetic resonance system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.71-72
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• 2016

In this paper, RTLS tag for high-precision positioning and wireless power transmission module is designed in order to solve the battery replacement problem. Wireless charging pad is available to charge the 4 RTLS tags at once. Charging time of the proposed protype in 50 cm distance is 22 minutes based on 3V reference voltage and 500 mW.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.4
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• pp.605-610
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• 2021

Wireless charging method using a laser is considered as the most efficient method at a long distance of the wireless charging method. Combining long-range laser wireless charging technology with wireless communication technology will make it possible to use it for a variety of applications. Accordingly, this paper shows the results of research and experiments on wireless charging and wireless communication simultaneously based on a laser. This technique uses a laser as a light source for E/O(: Electric-to-Optical) conversion at the transmitter for optical wireless power transmission. In the experimental results, the optical power transmission using a 100 mW laser transmitter and a solar cells receiver showed a DC-to-DC efficiency of 1.9 %, wireless optical communication showed a transmission speed of up to 90 kbps when the transmission distance is 15 m.

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.184-186
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• 2020

본 논문은 전기 자동차의 DC-DC 컨버터 공유형 유·무선통합 충전 시스템의 고효율 동작을 고려한 최적의 DC-link 전압을 설계한다. DC-DC 컨버터의 입력 DC-link 전압 크기에 따라 유·무선 충전 방식 간 효율 특성이 상이하므로 DC-link 전압 크기별 유·무선 충전 시스템의 손실 분석을 진행한다. 손실 분석 결과를 바탕으로 유·무선 통합 충전 시스템의 고효율 동작을 위한 최적 DC-link 전압을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.249-251
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• 2014

휴대폰 및 전자기기의 보급과 소비가 증가하면서 기기를 사용함의 기본이 되는 전력 공급의 문제가 대두되고 있는 상황이다. 이에 따라 소비자들의 가장 큰 관심은 기기의 전력을 얼마나 효율적으로 사용할 수 있느냐, 잦은 베터리의 충전을 최소화 할 수 있느냐에 쏠려있다. 사용량이 증가하는 추세에 의해 언제 어디서든 거리의 제한을 받지 않고 기기의 충전을 할 수 있는 무선 충전 기술 개발이 각광을 받고 있는 현실이다. 본 논문에서는 무선 충전의 효율성과 경쟁력을 확보할 수 있는 대안 기술로 현재 BLE기술 기반의 프로토콜을 사용하여 전력손실을 최소화 하는 근거리 통신 기술 서비스와 무선 충전 기술을 융합하는 시스템에 대해 연구하고자 한다.

• Journal of Information Technology and Architecture
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• v.10 no.1
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• pp.63-70
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• 2013

This paper deals with the trend analysis and the patent prior-art for wireless rechargeable technology. By this technological analysis, the corresponding service applications and the strategy upon the mobile smart phone regarding the design UX/UI and several wireless rechargeable technology have been derived. The market outlook on the wireless rechargeable technology grows rapidly so that the market size is increased about six times bigger than that of the last year, and it will grow about 18 billion dollars in 2014. Because of that, as the interest on this area outfocused, many kinds of technology and new product are being exploited in this field. So the technological guidance and the patent map for the wireless rechargeable technology will highly expected. Especially due to our analysis, research and development about service application of this technology is one of the most promising areas, and several technological suggestions are represented which include the patentability and invalidation, right strategy and licensing policy, and battery sharing with extended durability, etc.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.7
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• pp.275-280
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• 2013

This paper presents an optimizing method for wireless charging system, specifically focused on the capsule endoscope applications. In order to increase the wireless power transfer efficiency of electro-magnetic resonance coupled coils, this paper investigates the impact factors of the power transfer efficiency in small battery capacity system and proposes a efficiency optimizing method based on frequency control. Simulation results show that the proposed efficiency optimal control method can effectively stabilize the wireless power transfer efficiency so as to successfully solve the main issue of transfer efficiency variation with distance and as well as parasitic element.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.9
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• pp.9-16
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• 2020

Wireless charging has been considered an essential part of recent mobile devices. Moreover, various wireless charging systems have emerged through many studies. Among the systems, in the 2D flat coil system, the transmitter coil and receiver coil are arranged horizontally as close as possible to improve the charging efficiency. Nowadays, the 3D coil system has been proposed by adding some slope to flat 2D coils to reduce the volume. On the other hand, the 3D coil system has a lower charging efficiency than the 2D system that decreases rapidly with increasing distance. This paper proposes a new system that improves the low efficiency and charging freedom, which are the drawbacks of the existing 3D systems. The proposed system was designed in three-dimensions, and another transmitter coil was added to the transmitter coil to improve the transmission efficiency and flexibility. The measurement showed that the charging efficiency of the proposed system was 40.10% when the distance between coils was 8 mm, which is 20.5 % improvement over the existing one. The proposed method can be applied when new wireless charging systems are designed and improve charging efficiency can be improved.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.2
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• pp.255-260
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• 2021

The importance of electric vehicles is gradually increasing due to the recent depletion of fossil fuels. In order to use an electric vehicle, the battery built into the vehicle must be frequently charged. Electric vehicles has very good performance in terms of noise and vibration. However, due to the limitations of the battery, the mileage is considerably shorter than that of an internal combustion engine vehicle once it is charged, and the battery charging time is relatively long compared to the refueling time. There are two types of charging methods for electric vehicle batteries: plug-in and wireless charging. In this paper, we introduced the wireless charging technology for electric vehicles and the current state of technology development and standards in major countries.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.2
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• pp.213-218
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• 2022

In this paper, a technology for a high-efficiency wireless power transmission transmitting and receiving coil that can wirelessly charge a drone is introduced. The drone station implements the ability to charge the battery wirelessly without the need to remove the battery to charge the drone's battery. In order to charge the drone's battery in the shortest time, wireless charging efficiency must be high. In order to increase the wireless charging efficiency of the drone station, a method for manufacturing high-efficiency transmitting and receiving coils and a performance measurement method are presented. Transmitting and receiving coils were manufactured considering the size and weight of the drone so as not to interfere with the flight of the drone. Efficiency of 88% or more was realized at a distance of 40mm or more between the transmitting and receiving coils.