• Title/Summary/Keyword: Over-charging

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Power Control of Three Phase PWM Converter for Small-scale Wind Power using Flux Weakening Control in Over Wind Speed Region (과풍속 영역에서의 약계자 제어를 이용한 풍력발전용 3상 PWM 컨버터의 출력제어)

  • Ku, Hyun-Keun;Kim, Jae-Heung;Lee, Hyung-Uk;Kim, Jang-Mok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.19 no.2
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    • pp.149-156
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    • 2014
  • This paper proposes the battery charging algorithm for small-scale wind power generator using three phase PWM converter. it is impossible to control output power of the converter in over wind speed region since back EMF of PMSG is higer than battery voltage. Therefore, battery charging algorithm is proposed to expand battery charging over wind speed region. The suggested method is using the q-axis current for battery charging in the rated wind speed region. In the over wind speed region after it lower back EMF of PMSG using d-axis current it can control output power of the converter. The validity of the proposed algorithm are verified by experiments.

A study on the auto-charging circuit of the battery power units using trigger characteristics of semiconductor device (반도체 스위칭 소자의 트리거 특성을 이용한 배터리 자동 충전회로에 관한 연구)

  • 김영민;황종선;박성진;임종연;송승호
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.519-522
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    • 2001
  • Recently, the battery charging technology and reducing technology of harmonics on AC input line are rising importantly according to increasing electrical facilities that it has been replaced battery with emergency power. In this study, I proposed that an auto-charging circuit of battery has low cost with simple-construction circuit, relative, harmonics reduction with diode tap-change method, high reliability of system for using characteristics of thyristor switching. In case of this circuit, convenience and reliability of maintenance of battery power units were more improved. 1 think that it is resulted in effect of prevention to shortening of battery life from over-charging and over-discharging and decrease of harmonics obstacle on AC input line.

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Design on Algorithm of Power Control Unit for Charging Satellite Battery (위성 배터리 충전을 위한 전력제어유닛의 알고리즘 설계)

  • Park, JeongEon;Lee, Byoung-Hee
    • Journal of Satellite, Information and Communications
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    • v.12 no.4
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    • pp.95-99
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    • 2017
  • The lifetime of a battery that supplies all the power required by a satellite in the eclipse is directly related to the lifetime of the satellite. Because the lifetime of the battery is influenced by the charging method of the battery, the power control unit that controls the charging of the battery should be designed in consideration of battery life. The battery charging is performed by controlling the charge current in the power control unit generated from the solar cell in the daytime. In order to prevent overcharge of the battery and for considering frequency of eclipse in each season, parameters related battery charging should be designed differently according to the season and to prevent over-current charging and over-voltage charging during charging, charge current is controlled by monitoring battery charge / discharge status, charge current amount, battery voltage, battery capacity, battery temperature and battery cell voltage. In satellite, tapering method is used to control charge current by reflecting each condition. In this paper, design battery charging algorithm of satellite power control unit using tapering charging method. convert the designed algorithm into a code that can be uploaded to satellites and verify the operation through testing in the established satellite environment.

Buck-Type Charging Method for Loss Reduction of Multi-Function Inverter (다기능 인버터의 손실저감을 위한 Buck-Type 충전기법)

  • Kim, Dong-Hee;Woo, Dong-Gyun;Lee, Byoung-Kuk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.8
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    • pp.1523-1528
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    • 2011
  • This paper proposes buck-type charging method using motor inductance, 3-phase inverter and bi-directional converter without an additional charger in plug-in hybrid electric vehicles. The proposed system has advantages over the conventional system such as high charging efficiency, high power factor, and low total harmonic distortion. The validity of each methods are verified by theoretical analysis and simulation.

Design of the Protocol for Wireless Charging of Mobile Emotional Sensing Device (모바일 감성 센싱 단말기의 무선 충전을 위한 프로토콜 설계 및 구현)

  • Kim, Sun-Hee;Lim, Yong-Seok;Lim, Seung-Ok
    • IEMEK Journal of Embedded Systems and Applications
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    • v.7 no.2
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    • pp.95-101
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    • 2012
  • In order to supply emotion service depending on user's emotional change in a mobile environment, various researches have been carried. This paper discusses a protocol for wireless charging and an embedded platform of the mobile emotional sensing device which supports that. Wireless charging process relieves user's vexatious task to charge the emotional sensing device. To support wireless charging, there are one basestation and several mobile devices. Basestation coordinates and controls the devices over wireless communication, as well as supplies energy. For 1:N communication we defines the network whose superframe is classified into four categories: a network join superframe, a charging request superframe, a charging superframe and an inactive superframe. Physical layer provides how to supply energy to the devices and communicate physically. Mobile device is equipped with energy charged circuits, which correspond with the defined energy supplying method, as well as bidirectional communication circuits. Mobile device monitors and analyzes its own battery status, and is able to send a request packet to basestation. Therefore, it can be charged before its battery is exhausted without user's perception.

Charging the Assured-Bandwidth Service (최저대역보장형 서비스에 대한 과금)

  • 이훈;이광휘
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.3
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    • pp.179-179
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    • 2004
  • In the near future we can expect a change in charging the Internet service. The flat charging maybe replaced with a usage-based charging. In line with this movement, we propose a method of charging the assured-quality Internet services for the next generation network by introducing a UBC (usage-based charging) scheme over the conventional flat charging platform. First, we investigate the attribute of elastic traffic generated by assured services in IP network. Next, we propose a new method to relate the bandwidth usage with the pricing for the elastic traffic, which is based partially on the usage rate of the network bandwidth. Next, we propose a charging function for elastic traffic, which is applicable to any type of assured Internet services. Finally, we discuss the implication of the work via simple numerical experiments.

Charging the Assured-Bandwidth Service (최저대역보장형 서비스에 대한 과금)

  • Seok, Seung-Hak;Lee, Hoon;Lee, Kwang-Hui
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.3
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    • pp.21-28
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    • 2004
  • In the near future we can expect a change in charging the Internet service. The flat charging maybe replaced with a usage-based charging. In line with this movement, we propose a method of charging the assured-quality Internet services for the next generation network by introducing a UBC (usage-based charging) scheme over the conventional flat charging platform. First, we investigate the attribute of elastic traffic generated by assured services in IP network. Next, we propose a new method to relate the bandwidth usage with the pricing for the elastic traffic, which is based partially on the usage rate of the network bandwidth. Next, we propose a charging function for elastic traffic, which is applicable to any type of assured Internet services. Finally, we discuss the implication of the work via simple numerical experiments.

A Study on the Cuf-off Speed of Small-scale Wind Power System for Battery Charging (배터리 충전을 위한 소형풍력 발전 시스템의 한계 풍속에 관한 연구)

  • Ku, Hyun-Keun;Lee, Hyung-Uk;Kim, Jang-Mok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.4
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    • pp.484-489
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    • 2014
  • Three phase PWM(Pulse Width Modulation) converter of the small-scale wind power system is able to charge battery under the rated wind speed regions. However, it is impossible to control output power of converter at the over win speed region because back-EMF(Electro Motive Force) of PMSG(Permanent Magnet Synchronous Generator) is higher than the battery terminal voltage of PMSG is reduced. However, the cut-off wind speed exists although battery charging algorithm is implemented by flux weakening control method. Therefore, this paper performs analysis of other factors which affects limitation wind speed. The validity of the analysis are verified through simulation.

Charging and Revenue Estimation for the WiMAX System

  • Lee, Hoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.3B
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    • pp.288-303
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    • 2009
  • In the near future it is foreseen that a genuine multimedia service over the WiMAX system is provided in a worldwide manner by exploiting the QoS technologies introduced in the wireless and wired broadband network. In this work we propose a pricing scheme for the multimedia service over the generic WiMAX system that supports a full QoS functionality. We assume real-time services such as the voice and video as well as the nonreal-time service such as the conventional high-speed data, and we propose a pricing and charging scheme for those services by investigating the inherent characteristics of those services and the multiple-class of QoS-service provided to them. After that we propose a method to compute expected revenue that is obtained from the WiMAX system by using an analytic method to estimate the usage of the bandwidth resources for the different class of services. Via numerical experiment, we verify the implication of the work.

Development of the Switching Mode Conversion Type Pulse Charger for the Lead Battery of Solar Cell Generator Equipment by Fly-Back Converter Method (플라이백 컨버터방법에 의한 태양광발전설비의 납축전지 스위칭모드 전환형 펄스충전기 개발)

  • Shin, Choon-Shik;An, Young-Joo;Kim, Dong-Wan
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.1
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    • pp.20-26
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    • 2009
  • In this paper, the switching mode conversion type pulse charger by fly-back converter method for lead battery of the solar cell generator equipment is proposed. And we propose the control circuit and design method of insulated switching mode convert type pulse charger by fly-back convert method in the lead battery. The proposed system can minimize the current consumption by digital pulse. Also the proposed system can generate the constant 10[KHz] frequency, transmit the signal with main control system in the power control system. And it supervises the state of lead battery using one chip micro processor. The proposed the switching mode conversion type pulse charger by the fly-back converter method can charge fast and stabilize lead battery with nominal value 12[V], 20[AH]. Also we propose the design procedure of the power control circuit for turn ratio of fly-back inductor and determining method of values such as the charging current, bulk current, partial current, over current value and fixed charging voltage. The experiment results for the voltage and current wave for partial, bulk, over and fixed charging period show the good charging effect and performance. And the PCB and internal coupling diagram of the switching mode conversion type pulse charger by fly-back converter method is presented.