• Title, Summary, Keyword: charging system

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Bidirectional Power Transmission Fuel Cell System for Notebook Battery (노트북 배터리용 양방향 전력전송 연료전지 시스템)

  • JOUNG, GYUBUM
    • Transactions of the Korean hydrogen and new energy society
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    • v.28 no.3
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    • pp.273-278
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    • 2017
  • In this paper, a fuel cell battery charger system, which is capable of bi-directional power transmission without built in battery, has been designed and fabricated. Performance and states of the notebook battery in bi-directional power transmission using the manufactured system have been tested. Before initializing the fuel cell charging system for 1 minute, the system received 10 W of electric power from notebook battery. Then the fuel cell charging system has been normal charging to notebook battery by 50 W. As a result of the experiment, the state of the notebook battery discharged less than 5% at the initial charging time, but then it has been charged. This results proves bi-directional power transmission in notebook computers increase the availability of fuel cell chargers.

Dynamic Analysis of an Ammonia-Water Absorption Chiller (암모니아-물 흡수식 냉각기의 동적 해석)

  • Kim Byong Joo
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.10
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    • pp.990-998
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    • 2004
  • Dynamic behavior of an ammonia-water absorption system was investigated numerically. Thermal-hydraulic model for a single-effect 3 RT chiller was developed by applying transient conservation equations of total mass, $NH_3$ mass, energy and momentum to each component. Transient variations of system properties and transport variables were analysed during start-up operation. Numerical analyses were performed to quantify the effects of bulk concentration and charging ratio on the system performance in terms of cooling capacity, coefficient of performance, and time constant of system. For an absorption chiller considered in the present study, optimum charging ratio and bulk concentration were to found to exist, which resulted in the maximum cooling capacity and COP. The time constant increased as the charging ratio increased, but decreased with the increase of bulk concentration.

Independent Generation System Design for the Economic Management of Electrical Charging Stations (전기충전소의 경제적 운영을 위한 독립발전 시스템 설계)

  • Seo, Jin-Gyu;Kim, Kyu-Ho;Rhee, Sang-Bong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.2
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    • pp.222-227
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    • 2015
  • This paper presents the optimal energy generation systems for economical EVs(Electric Vehicles) charging stations located in an island area. The system includes grid electricity, diesel generator and renewable energy sources of wind turbines and PV(Photovoltaic) panels. The independent generation system is designed with data resources such as annual average wind speed, solar radiation and the grid electricity price by calculating system cost under different structures. This sensitive analysis on the varying data resources allows for the configuration of the most economical generation system for charging stations by comparing initial capital, operating cost, NPC(Net Present Cost) and COE(Cost of Energy). Depending on the increase of the grid cost, the NPC variation of the most economical system which includes renewable energy generations and grid electricity can be smaller than those of other generation systems.

Performance and analysis of wireless power charging system from room temperature to HTS magnet via strong resonance coupling method

  • Chung, Y.D.;Lee, C.Y.;Lee, S.Y.;Lee, T.W.;Kim, J.S.
    • Progress in Superconductivity and Cryogenics
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    • v.18 no.1
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    • pp.41-45
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    • 2016
  • The technology of supplying the electric power by wireless power transfer (WPT) is expected for the next generation power feeding system since it can supply the power to portable devices without any connectors through large air gap. As such a technology based on strongly coupled electromagnetic resonators is possible to deliver the large power and recharge them seamlessly; it has been considered as a noble option to wireless power charging system in the various power applications. Recently, various HTS wires have now been manufactured for demonstrations of transmission cables, motors, MAGLEV, and other electrical power components. However, since the HTS magnets have a lower index n value intrinsically, they are required to be charged from external power system through leads or internal power system. The portable area is limited as well as the cryogen system is bulkier. Thus, we proposed a novel design of wireless power charging system for superconducting HTS magnet (WPC4SM) based on resonance coupling method. As the novel system makes possible a wireless power charging using copper resonance coupled coils, it enables to portable charging conveniently in the superconducting applications. This paper presented the conceptual design and operating characteristics of WPC4SM using different shapes' copper resonance coil. The proposed system consists of four components; RF generator of 370 kHz, copper resonance coupling coils, impedance matching (IM) subsystem and HTS magnet including rectifier system.

Thermal performance of the spherical capsule system using paraffin as the thermal storage material (파라핀 축열재를 사용한 구형캡슐 시스템의 전열성능)

  • Cho, K.N.;Choi, S.H.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.9 no.3
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    • pp.354-363
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    • 1997
  • The purpose of the present work is to show the best thermal storage material and the sensitivity of the parameters on the thermal performance by experimentally investigating the effects of the parameters on the thermal performance of the spherical capsule system using paraffins superior to the commercial one. The paraffins were n-Tetradecane and the mixture of n-Tetradecane 40% and n-Hexadecane 60%. The experimental parameters were the Reynolds number of 8, 12, and 16 and the inlet temperature of-7, -4, -1, and $2^{\circ}C$. The charging and the discharing time, the dimensionless thermal storage amount, and the averge heat transfer coefficient in the tank were obtained by utilizing the local temperature variation in the tank. The local charging and discharging time in the tank was axially and radially different a lot. The effects of the inlet temperature on the charging and the discharging time were larger during the charging process than during the discharging process, but the effects of the Reynolds number on the charging and the discharging time were in reverse order. The paraffins were better by 11~72% than the water with the inorganic material in the charging time aspect, but no difference in the discharging time aspect. The effects of the Reynolds number on the dimensionless thermal storage amount were smaller than the effects of the inlet temperature during the charging process, but in reverse order during the discharging process within the working range of the experimental parameters. The effects of the inlet temperature and the Reynolds number on the average heat transfer coefficient were larger during the discharging process than during the charging process. The average heat transfer coefficient for the paraffins was larger by 40% maximum than that for the commercial material during the charing and the discharging process.

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A study on the improvement of efficiency in the light railway vehicle system using IPT (유도 급전을 이용한 경전철 시스템의 효율 개선에 대한 연구)

  • Choi, Seung-Cheol;Lee, Byung-Song;Mok, Hyung_Soo
    • Proceedings of the KIPE Conference
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    • pp.62-63
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    • 2010
  • This paper presents a potential for application of Inductive Power Transfer(IPT) to the light railway vehicle system. IPT system allows for a vehicle fitted with existing or new generation batteries to park over a small charging unit and commence charging immediately. Regular charging will allow for smaller batteries to be used in vehicles. In this paper, IPT system uses a full-bridge LLC resonant converter and is possible for the regenerative braking which is an energy recovery mechanism.

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A Study on the Strategy of Smart Charging System to Charge the PHEV in the House Which has a 1 kW Fuel Cell Cogeneration System (1 kW 급 가정용 연료전지 코제너레이션 시스템이 설치된 주택 내 플러그인 하이브리드 자동차의 스마트 충전전략 연구)

  • Roh, Chul-Woo;Kim, Min-Soo
    • Proceedings of the SAREK Conference
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    • pp.838-843
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    • 2008
  • Cause of struggling to escape from dependency of fossil fuels, the fuel cell and the Plug-in Hybrid Electric Vehicle (PHEV) draw attention in the all of the world. Especially, the Polymer Electrolyte Membrane Fuel Cell (PEMFC) systems have been anticipated for next generation's energy supplying system, and we can predict the PHEV will enlarge the market share in the next few years to reduce not only the air pollution in the metropolis but the fuel-expenses of commuters. This paper presents simulation results about the strategy of smart charging system for PHEV in the residential house which has 1 kW PEMFC cogeneration system. The smart charging system has a function of recommending the best time to charge the battery of PHEV by the lowest energy cost. The simulated energy cost for charging the battery based on the electricity demand data pattern in the house. The house which floor area is $132\;m^2$ (40 pyeong.). In these conditions, the annual gasoline, electricity, and total energy cost to fuel the PHEV versus Conventional Vehicle (CV) have been simulated in terms of cars' average life span in Korea.

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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 on EVs Smart Charging Scheme Considering Time-of-Use Price and Actual Data (Time-of-Use 가격 및 실제 데이터를 고려한 전기 자동차 스마트 충전기법에 대한 연구)

  • Kim, Junhyeok;Kim, Chulhwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.11
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    • pp.1793-1799
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    • 2016
  • As one of the main trends in global industries is eco-friendly energy, the interest on Electric Vehicle(EV) has been increased. However, if large amount of EVs start to charging, it could cause rapid increase in demand power of the power system. To guarantee stable operation of the power system, those unpredictable power consume should be mitigated. In this paper, therefore, we propose a practical smart EVs charging scheme to prevent the rapid increase of the demand power and also provide load flattening function. For that we considered Time-of-Use(ToU) price and actual data such as driving pattern and parameters of distribution system. Simulation results show that the proposed method provides proper load flattening function while preventing the rapid increase of the demand power of the power system.

An Improved Battery Charging Algorithm for PV Battery Chargers (태양광 배터리 충전기를 위한 개선된 충전 알고리즘)

  • Kim, Jung-Hyun;Jou, Sung-Tak;Lee, Kyo-Beum
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.6
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    • pp.507-514
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    • 2013
  • In this paper, the proposed charging algorithm is converted from the charging mode to compensate the transient state in the solar battery charging system. The maximum power point tracking (MPPT) control methods and the various charging algorithms for the optimal battery charging are reviewed. The proposed algorithm has excellent transient characteristics compare to the previous algorithm by adding the optimal control method to compensate the transient state when the charging mode switches from the constant current mode to the constant voltage mode based on the conventional constant-current constant-voltage (CC-CV) charging algorithm. The effectiveness of the proposed method has been verified by simulations and experimental results.