• Title, Summary, Keyword: charging system

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Characteristics of Variable Wireless Charging System Applying Superconducting Coils (초전도 코일을 적용한 무선 충전시스템 특성)

  • Jeong, In-Sung;Choi, Hyo-Sang
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.6
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    • pp.804-808
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    • 2018
  • 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.

A 20kHz Inverter for Inductive Charging System of Electric Vehicle (전기자동차 비접촉식 충전시스템을 위한 20kHz 인버터 설계)

  • Kim, Chul-Woo;Kim, Sang-Beom;Soh, Joon-Young;Lim, You-Seok
    • Proceedings of the KIEE Conference
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    • pp.1175-1176
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    • 2011
  • Electric Vehicle Supply Equipment(EVSE) is a system or an equipment to supply electric power for charging the traction batteries on the electric vehicle. EVSEs are classified with a conductive charging system and an inductive charging system by the power transfer method. Inductive charging systems are necessary to use high frequency converters to increase the output power and to reduce the size of the charging systems. In this paper, a 20kHz inverter for inductive charging system has been designed and PSCAD/EMTDC have been used to simulate the output characteristics of the 20kHz inverter.

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A Design and Control of Rapid Electric Vehicle Charging System for Lithium-Ion Battery (전기자동차용 리튬이온 배터리 급속충전장치 설계와 제어)

  • Kang, Taewon;Suh, Yongsug;Park, Hyeoncheol;Kang, Byungik;Kim, Simon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.1
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    • pp.26-36
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    • 2013
  • This paper presents a simple and cost-effective stand-alone rapid battery charging system of 30kW for electric vehicles. The proposed system mainly consists of active front-end rectifier of neutral point clamped 3-level type and non-isolated bi-directional dc-dc converter of multi-phase interleaved half-bridge topology. The charging system is designed to operate for both lithium-polymer and lithium-ion batteries. The complete charging sequence is made up of three sub-interval operating modes; pre-charge mode, constant-current mode, and constant-voltage mode. The pre-charge mode employs the stair-case shaped current profile to accomplish shorter charging time while maintaining the reliable operation of the battery. The proposed system is specified to reach the full-charge state within less than 16min for the battery capacity of 8kWh by supplying the charging current of 78A. Owing to the simple and compact power conversion scheme, the proposed solution has superior module-friendly mechanical structure which is absolutely required to realize flexible power expansion capability in a very high-current rapid charging system.

A Charging Mechanism in the System Interworking between Wireless LANs and Cellular Networks (무선 LAN과 이동통신망을 연동하는 통합 시스템에서의 과금 방안)

  • 이완연;박찬영
    • Journal of KIISE:Information Networking
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    • v.31 no.1
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    • pp.53-61
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    • 2004
  • In this paper, we investigate a charging mechanism for the system interworking between Wireless Local Area Networks(LANs) and Cellular Networks. Because the charging mechanisms of the two networks are different, a unified charging mechanism is required to correlate the charging informations of the two networks in the system interworking. Therefore, we propose a unified charging mechanism to collect charging information with a combined identifier. Also, we propose a decision method to control the interval of transferring accounting information according to the charging types of users (pre-paid, off-paid, and fixed-rate) and show that the proposed decision method improves the granularity and the communication efficiency of charging informations.

Improvement of Battery Charging Efficiency of ESS for Wind Power Application Using DC-AC Hybrid Charging Pattern (직교류 합성 충전 패턴을 이용한 풍력 연계용 ESS의 배터리 충전 효율 향상)

  • Lee, Jong-Hak;Song, Seung-Ho
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.4
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    • pp.330-335
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    • 2017
  • Increased fossil fuel consumption causes global warming, environmental pollution, and abnormal climate change. Wind-generated power installation is proposed to solve this problem. Recently, the wind power plant construction case encourages the installation of the energy storage system (ESS) to improve the intermittency of wind power. The maximized ESS operation profits connected to wind power are not generated in the simplest operation pattern of charging at night and discharging at day. The battery charging efficiency improvement should be considered to get more profits. Thus, there is a possibility of increasing ESS operation profits by analyzing the battery AC and DC charging/discharging efficiency and the yearly average sealed maintenance free (SMP) in hours. In this paper, the battery impedance characteristic, AC and DC charging/discharging efficiency, and the yearly average SMP are analyzed. The operation scenario to improve the ESS battery charging efficiency connected to wind power is proposed and verified via simulation.

A study on the application of urban railway DC electric power for electric car charging system (전기차 충전시스템을 위한 도시철도 DC 전력의 활용방안 연구)

  • Kang, Hyun-Il;Kin, Youn-Sik;Sim, Jae-Suk;Im, Hyeong-Gil;Ryu, Ki-Seon;Lee, Gi-Seung
    • Proceedings of the KSR Conference
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    • pp.1855-1860
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    • 2010
  • Electric vehicles have reached a new level of development with introductions by Chrysler, Ford, Honda and Toyota. Today's charging technology includes conductive and inductive charging systems. There are three standardized charging levels: Level 1: charging can be done from a standard, grounded AC 120V, 3-prong outlet available in all homes; Level 2: charging is at AC 240V, 40 amp charging station with special consumer features to make it easy and convenient to plug in and charge EVs at home or at an EV charging station; Level 3: a high-powered charging "fast charge" technology currently under development that will provide a charge in less than 15 minutes. The incoming AC power is converted to DC and stored in the vehicle's batteries. In this paper, we investigated the application of urban railway DC electric power for electric car charging system.

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Evaluation for Charging effects of Plug-in Electrical Vehicles in Power System considering Optimal Charging scenarios (전기자동차의 충전부하특성 모델링 및 충전 시나리오에 따른 계통평가)

  • Moon, Sang-Keun;Kim, Sung-Yul;Kin, Jin-O
    • Proceedings of the KIEE Conference
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    • pp.298-299
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    • 2011
  • The impacts of EV charging demands on power system such as increased peak demands may be developed by means of modeling a stochastic distribution of charging and a demand dispatch calculation. Optimization processes are proposed to determine optimal demand distribution portions so that charging costs and demands can be managed optimally. There are two optimization methods which have different effects on the outcome. These focus either on the Electric vehicle customer side (cost optimization) or the System Operator side (Load-weighted optimization).

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Development of Super-capacitor Battery Charger System based on Photovoltaic Module for Agricultural Electric Carriers

  • Kang, Eonuck;Pratama, Pandu Sandi;Byun, Jaeyoung;Supeno, Destiani;Chung, Sungwon;Choi, Wonsik
    • Journal of Biosystems Engineering
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    • v.43 no.2
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    • pp.94-102
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    • 2018
  • Purpose: In this study, a maintenance free super-capacitor battery charging system based on the photovoltaic module, to be used in agricultural electric carriers, was developed and its charging characteristics were studied in detail. Methods: At first, the electric carrier system configuration is introduced and the electric control components are presented. The super-capacitor batteries and photovoltaic module used in the experiment are specified. Next, the developed charging system consisting of a constant current / constant voltage Buck converter as the charging device and a super-capacitor cell as a balancing device are initiated. The proposed circuit design, a developed PCB layout of each device and a proportional control to check the current and voltage during the charging process are outlined. An experiment was carried out using a developed prototype to clarify the effectiveness of the proposed system. A power analyzer was used to measure the current and voltage during charging to evaluate the efficiency of the energy storage device. Finally, the conclusions of this research are presented. Results: The experimental results show that the proposed system successfully controls the charging current and balances the battery voltage. The maximum voltage of the super-capacitor battery obtained by using the proposed battery charger is 16.2 V, and the maximum charging current is 20 A. It was found that the charging time was less than an hour through the duty ratio of 95% or more. Conclusions: The developed battery charging system was successfully implemented on the agricultural electric carriers.

Design of a Rechargeable Battery Wireless Charging System

  • Kim, Dae-Hyun;Yeo, Tae-Dong
    • Journal of electromagnetic engineering and science
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    • v.16 no.4
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    • pp.210-213
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    • 2016
  • This paper presents a wireless power charging system for rechargeable batteries. Recently, misalignment between transmitting coil and receiving coils has been a significant factor to wireless power charging systems, which are prone to lateral and angular misalignment. Unfortunately, the batteries can be easily rolled because of the shape, and coils are often misaligned while charging devices, in practical situations. This paper presents the wireless power battery charging system. In order to solve the angular misalignment, two perpendicular coil having structure of 'plus (+)' shape was proposed. To validate the results, the proposed wireless power charging system was implemented at 6.78 MHz using loosely coupled resonant coils, and the system was verified as being robust to misalignment.

A Study of Electronic Vehicle Charging Station Structure System Using PV(Photovoltaic) System (PV 시스템을 이용한 전기자동차 충전소의 구조시스템 연구)

  • Lim, Jae-Hwi;Yoon, Sung-Won
    • Journal of the Korean Association for Spatial Structures
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    • v.11 no.1
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    • pp.105-112
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    • 2011
  • Fundamental Electric vehicle charge system is urgently needed for commercialization of electric vehicles. Car parking building is equipped with PV system for providing electricity to charge electric vehicles, because it must be charged at least for 30 minutes. In parking lots abroad, electric car charging stations are installed to charge electric cars by the electricity gained from PV systems which are also installed. Also, charge infrastructure construction plans and electric car charging facility support standards are being set and proposed, but there are no cases like abroad of electric car charging stations using PV systems and only electric car charging stations using ordinary electricity are being proposed. Therefore, this paper prepares establishment of domestic electric car charging networks. By researching inside outside solar parking lots and cases of abroad PV system electric car charging stations, and by analysis and comparative analysis of structural systems, structural material, and etc., many cantilever structure and small-size types were installed in PV system electric car charging stations.