• Title/Summary/Keyword: Wireless Charging

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Electric Power Charging of Silicon Solar Cells using a Laser (레이저 조사에 따른 실리콘 솔라셀의 출력 특성)

  • Lee, Hu-Seung;Bae, Han-Sung;Kim, Seongbeom;Joo, Yun-Jae;Kim, Jung-Oh;Noh, Ji-Hwan
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.25 no.5
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    • pp.362-367
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    • 2016
  • Recently, wireless charging systems have expanded their applications from household electrical appliances to outdoor activity devices. In wireless charging systems, solar cells have versatile advantages, such as abundant raw materials within the earth, reasonable prices of products, and highest power conversion efficiency. In this study, the photovoltaic effect between a silicon solar cell and a photon of infrared wavelength was simulated using a Shockley diode equation. A solar cell power charging system was then set up to: 1) clarify mechanisms of the charging interaction based on the photovoltaic effect with a laser source, and 2) verify interdependency of the parameters: laser settings and geometrical position between a solar cell and the laser. As was observed, the solar cell generates more power when the photon was irradiated uniformly, intensively, and vertically on the surface of the solar cell.

Deep Learning Based Error Control in Electric Vehicle Charging Systems Using Power Line Communication (전력선 통신을 이용한 전기자동차 충전 시스템에서 딥 러닝 기반 오류제어)

  • Sun, Young Ghyu;Hwang, Yu Min;Sim, Issac;Kim, Jin Young
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.17 no.4
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    • pp.150-158
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    • 2018
  • In this paper, we introduce an electric vehicle charging system using power line communication and propose a method to correct the error by applying a deep learning algorithm when an error occurs in the control signal of an electric vehicle charging system using power line communication. The error detection and correction of the control signal can be solved through the conventional error correcting code schemes, but the error is detected and corrected more efficiently by using the deep learning based error correcting code scheme. Therefore, we introduce deep learning based error correction code scheme and apply this scheme to electric vehicle charging system using power line communication. we proceed simulation and confirm performance with bit error rate. we judge whether the deep learning based error correction code scheme is more effective than the conventional schemes.

Study of Constant Current-Constant Voltage Output Wireless Charging System Based on Compound Topologies

  • Tan, Linlin;Pan, Shulei;Xu, Changfu;Yan, Changxin;Liu, Han;Huang, Xueliang
    • Journal of Power Electronics
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    • v.17 no.4
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    • pp.1109-1116
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    • 2017
  • Wireless power transfer (WPT) technology has the advantages of intelligence and facilitation. This paper designs a WPT system applied to battery charging and provides a strategy which switches from the constant current (CC) charging mode to constant voltage (CV) charging mode. The LCL-LCL topology is used to realize the CC output, while the LCL-S (series compensation) topology is used to realize the CV output. The main factor affecting the output characteristics is extracted by analyzing the two topologies above. Based on the main factor, this paper puts forward a modified way to design the system. In addition, on-line monitors for the battery and switches are placed at receiving side, which avoids the need for introducing an information interaction module into the system. Therefore, the complexity of the controlling system is reduced. Finally, simulation and experimental analyses are carried out to verify the correctness of the compound topologies.

A Study of Security Requirement in Wireless Charging (무선충전에서 보안요구사항에 관한 연구)

  • Lee, Keun-Ho
    • Journal of the Korea Convergence Society
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    • v.5 no.3
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    • pp.23-27
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    • 2014
  • In recent times, there is an increasing interest in wireless charge of smartphones and devices, and many companies are developing wireless charges. The range of application of wireless charge would be expanded to almost all electronics, including not only mobile devices, but also notebook computers and vacuum cleaners. On-line electric vehicles are to be launched in the market this year in a massive scale. As such wireless charge-related markets are inexhaustible. Wireless charge is included in the world's top 10 promising technologies, and its rapid growth is expected to have annual growth by more than 100%. However, there's a need to establish a safe environment, by analyzing security threats to technical limitations and harmfulness to human body, and arrange institutional compliments. The development of communication method for a variety of wireless charging are delivering comfortable and safe information. This paper aims to examine the factors to threaten electric vehicle, which are usually intruded through network system and analyzes security threats to and security requirements for magnetic resonance mode-based wireless charge in mobile devices, and suggests security requirements.

Application of Wireless Power Transmission Technology to Contactless Umbilical Connector of Unmanned Vehicle (무선 이동체의 비접촉 배꼽장치를 위한 무선전력전송 기술의 응용)

  • Shin, Yujun;Park, Jaehyoung;Kim, Jonghoon;Kwon, Byunggi;Eun, Heehyun;Ahn, Seungyoung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.28 no.9
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    • pp.713-722
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    • 2017
  • In the future battlefield, the role of the unmanned vehicle is very important. Currently, charging and management systems for unmanned vehicles are all wired. However, for convenience and stability, it is desirable that the charging of the unmanned vehicle uses wireless power transfer system. In this paper, we have studied the application of wireless power transfer system to the charging of unmanned vehicles. Considering the size of the unmanned vehicle and the required power, the transmission coil and the receiving coil are designed through the finite element analysis based magnetic field simulation. The coil was made according to the simulation results and the circuit simulation was performed through the measured parameter values. Finally, we show that wireless power transmission can be applied to unmanned mobile charging through actual experiments.

The Power Converter Circuit Characteristics for 3 kW Wireless Power Transmission (3 kW 무선 전력전송을 위한 전력 변환기 회로 특성)

  • Hwang, Lark-Hoon;Na, Seung-kwon;Kim, Jin Sun;Kang, Jin-hee
    • Journal of Advanced Navigation Technology
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    • v.24 no.6
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    • pp.566-572
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    • 2020
  • In a wireless power transmitter, the characteristics and effects of wireless power transmission between two induction coils are investigated, and a power converter circuit and a battery charger/discharger circuit using wireless power transmission technology are proposed. The advantage of wireless power transmitters and wireless chargers is that, instead of the existing plug-in-mounted wired charger (OBC; on-board charger), the user can wirelessly charge the battery without connecting the power source when charging power to the battery. There is. In addition, the advantage of wireless charging can bring about an energy efficiency improvement effect by using the secondary side rectifier circuit and the receiving coil, but the large-capacity long-distance wireless charging method has a limitation on the transmission distance, so many studies are currently being conducted. The purpose of the study is to study the transmitter circuit and receiver circuit of a wireless power transmission device using a primary coil, a secondary coil, and a half bridge series resonance converter, which can transmit power of a non-contact type power transmitter. As a result, a new topology was applied to improve the power transmission distance of the wireless charging system, and through an experiment according to each distance, the maximum efficiency (95.8%) was confirmed at an output of 3 kW at an 8 cm transmission distance.

A Development of the Electric Power Supply System for PRT Vehicle (PRT 차량의 전력 공급시스템 개발)

  • Kim, Baek-Hyun;Jeong, Rag-Gyo;Chung, Sang-Gi;Kang, Seok-Won
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.2
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    • pp.196-200
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    • 2013
  • In this paper, the design of PRT vehicle power supply system is discussed. Since there is no power feeding line facilities in PRT system under development, the PRT vehicle must have its own energy storage device on board. For the energy storage device, ultra-capacitor bank is applied due to its fast charging capability and long life time. Charging the Ultra-capacitor bank is performed by wireless inductive power transfer system. The capacitor bank is charged up in less than 10 seconds when the vehicle is traveling by passenger stations. In this paper the design of the ultra-capacitor bank and the wireless inductive power transfer system for the PRT vehicle are discussed. Tests are conducted for the both system and the result shows the efficiency of the wireless inductive power transfer system is higher than 80%.

Wireless Power Charging System Capable of Soft-Switching Operation Even in Wide Air Gaps (넓은 공극범위에서 소프트스위칭 동작하는 무선전력 충전시스템)

  • Yu-Jin, Moon;Jeong-Won, Woo;Eun-Soo, Kim;In-Gab, Hwang;Jong-Seob, Won;Sung-Soo, Kang
    • The Transactions of the Korean Institute of Power Electronics
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    • v.27 no.6
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    • pp.515-525
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    • 2022
  • The wireless power transfer (WPT) charging system for AGV depends highly on the coupling conditions due to air gap variation. To attain stable output power with high transfer efficiency under various coupling conditions, a single-stage, DC-DC converter that operates with robustness to changes in air gaps is proposed for the WPT system. The proposed converter is capable of soft switching under the set input voltage (Vin: 380 VDC), load conditions (0-1 kW), and air gap changes (30-70 mm). In addition, a wide output voltage range (Vo: 39-54 VDC) can be controlled by varying the link voltage due to the phase control at a fixed switching frequency. Experimental results are verified using a prototype of a 1 kW wireless power charging system.

Parameter Tuning of Wireless Charging Circuit using Switched-Capacitor (스위치드-커패시터를 이용한 무선충전회로의 파라미터 튜닝)

  • Kim, Myoung-Su;Kang, Byeong-Geuk;Chung, Se-Kyo
    • Proceedings of the KIPE Conference
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    • 2013.07a
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    • pp.315-316
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    • 2013
  • This paper presents a parameter tuning method of a LLC resonant converter for a wireless charging circuit. A switched-capacitor is used to change the resonant frequency of the resonant circuit. The simulation results verify that the efficiency of the power transfer can be improved by a duty control of the switched-capacitor for various values of the coupling coefficient.

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A Study on the Economic Analysis of Introducing Battery-Based Eco Bus: Case Study of Daegu City, South Korea (친환경 버스 도입에 따른 경제성 분석에 관한 연구 (대구광역시 중심으로))

  • Bak, Jae Seok;Kim, Sung-Yul;Kim, Dong-Min
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.3
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    • pp.343-351
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    • 2018
  • Renewable energy sources has drawn considerable attention as clean energy sources because of changing public attitudes regarding greenhouse gas and fine dust. Recently, in this respect, the government provides the drivers of electric vehicles with various benefits such as tax reduction, financial incentives and free parking from the public to the private sector. Plug-in electric vehicles are the most common in the private sector. Otherwise, different types of battery-based buses in the public sector are being developed, and there are three main types of charging: plug-in, battery swapping and wireless. Therefore, economic assessment of charging types in each bus route is required in order to facilitate the use of battery-based buses instead of the existing CNG buses. In this paper, net present value(NPV) and B/C ratio of charging types are evaluated in consideration of the bus schedule, the cost of charging station, and the life cycle of battery, etc. per each bus route. In case study, main bus routes in Daegu City are simulated with the proposed evaluation method to validate the eco-bus project.