• Title, Summary, Keyword: Charge/discharge current

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A Study of the Irradiation Environment Effects on the Electrical Properties of Ethylene Propylene Rubber (방사선 조사 환경에 의한 에칠렌 프로필렌 고무의 전기 특성에 관한 연구)

  • 이성일
    • Journal of the Korea Safety Management and Science
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    • v.2 no.2
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    • pp.187-200
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    • 2000
  • The charge and discharge current in EPR(Ethylene Propylene Rubber), which were irradiated with the radiant capacity of 0~600 [kgy/h], have been measured in order to investigate the influence of the atmosphere (oxygen, air and vacuum) on electrical properties. It has been shown that the charge and discharge current increase as the amount of radiant capacity increases in air and vacuum atmosphere. This electrical property degradation can be speculated due to that the C=O radicals or impurities, which comes from during shaping process, may act as dipoles. On the other hand, the charge and discharge current are shown to be higher in the amount of 1[kgy/h] than these in 10[kgy/h] in air atmosphere, because the charge and discharge current can be increased as the exposure time is extended with slower rate. Under the same amount of irradiation, the charge and discharge current in oxygen atmosphere are shown to be higher than those in vacuum. This is possibly due to that the main chain can be broken by oxidation when it is exposed to the $\gamma$ -rays.

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A Study on Properties of Charge & Discharge Current by Degrade in EPR (EPR의 열화에 의한 충.방전 전류 특성에 관한 연구)

  • Lee, Sung-Ill
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.7
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    • pp.679-685
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    • 2008
  • This paper describes the degraded properties of between the charge and discharge current for ${\gamma}$-ray irradiated in electric power cable rubbers using in nuclear power generating station. The charge and discharge current of degradation in EPR(Ethylene Propylene Rubber), which were irradiated with the radiant capacity of 0.033 Mrad/h, have been measured in order to investigate the influence of the atmosphere(in amount of reinforcing agent, moisture absorption and heat treatment) on electrical properties. When ${\gamma}$-ray were irradiated on the EPR with more reinforcing agent from 4 to 40 Phr, charge and discharge currents was increase due to the amount of reinforcing agent. It was verified that the discharging and charging currents irradiated by ${\gamma}$-ray were higher than those that was not irradiated. The amount of the degraded current was more after moisture absorption than before moisture absorption. The charge and discharge current after heat treatment was similar to that of before heat treatment and it was decreased with the time elapsed. As these properties related with ${\gamma}$-ray irradiation dose, it is suggested that these properties can be utilized as a index of irradiation degradation.

The Characteristic of voltage and Current in Discharge-pumped Excimer Laser with Charge Transfer Type (용량이행형 방전여기 엑사이머 레이저의 전압 전류 특성)

  • Jung, Jae-Keun;Choi, Boo-Yeon;Lee, Choo-Hie
    • Proceedings of the KIEE Conference
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    • pp.405-407
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    • 1987
  • We calculated the discharge resistance, which is determined by plasma dynamics, of the discharge pumped excimer lasers with charge-transfer type. And investigated the characteristic of discharge voltage and current using EMIP.

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The Surface Modification of Electrode with Solid Electrolyte Interphase for Hybrid Supercapacitor

  • Choi, Min-Geun;Kang, Soo-Bin;Yoon, Jung Rag;Lee, Byung Gwan;Jeong, Dae-Yong
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.1102-1106
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    • 2015
  • A hybrid supercapacitor (HS) is an energy storage device used to enhance the low weight energy density (Wh/kg) of a supercapacitor. On the other hand, a sudden decrease in capacity has been pointed out as a reliability problem after many charge/discharge cycles. The reliability problem of a HS affects the early aging process. In this study, the capacity performance of a HS was observed after charge/discharge. For detailed analysis of the initial charge/discharge cycles, the charge and discharge curve was measured at a low current density. In addition, a solid electrolyte interphase (SEI) layer was confirmed after the charge/discharge. A HC composed of a lithium titanate (LTO) anode and active carbon cathode was used. The charge/discharge efficiency of the first cycle was lower than the late cycles and the charge/discharge rate was also lower. This behavior was induced by SEI layer formation, which consumed Li ions in the LTO lattice. The formation of a SEI layer after the charge/discharge cycles was confirmed using a range of analysis techniques.

The Discharge Characteristic Analysis of a Ramp Reset Waveform Using a 2-Dimensional Numerical Simulation in AC PDP (AC PDP에서 2차원 수치해석을 이용한 Ramp Reset 구동파형에 따른 방전 특성 분석)

  • Park Suk-Jae;Choi Hoon-Young;Seo Jeong-Hyun;Lee Seok-Hyun
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.12
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    • pp.606-615
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    • 2004
  • The discharge characteristics of a ramp reset waveform in the alternating current plasma display panel(ac PDP) were studied using a 2-dimensional numerical simulation. We analyzed the wall charge variation during the reset discharge, address discharge and sustain discharge adopting a ramp reset waveform. Then we investigated the principal parameters for a successful discharge. In this paper, we suggest a new parameter, printing particles' density and its effects on the stability of the ramp discharge. The maximum current flows of the three electrodes during the ramp reset period were decreased with the increase in the priming particles's density which was explained with the wall charge characteristics and the current flow characteristics obtained by a 2-D simulation.

A Basic Study on Electrification Phenomena of Synthetic Polymer Material (합성고분자재료의 대전현상에 관한 기초연구)

  • 이덕출;한상옥
    • 전기의세계
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    • v.28 no.10
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    • pp.48-54
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    • 1979
  • The electrification phenomena of polymerized materials is governed by the competitive processes of the charge generation and the charge dissipation. In this paper, The charged particles were supplied on the naked upper surface of the polyethylene film from a point corona discharge with a screen electrode which controls the potential difference across the film. The charging current with the corona charging was found to be larger than that obtained with the electric charging on the MIM structure and the discharge current was found to flow in the same direction as that of the charging current. these results can suggest that the charge injection occurs from the interface between the polethylene surface and the accumulated charge layer, the injected charge are trapped and the space charge is established.

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A Novel Battery Charge/Discharge System with Zero Voltage Discharge Function (영전압 방전 기능을 갖는 새로운 배터리 충방전시스템)

  • Nguyen, Quang Manh;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • pp.169-170
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    • 2013
  • One important test for formation and grading of the lithium-ion battery is to confirm the performance of the battery while discharging battery down to zero volts. In this paper, a novel charge/discharge converter with zero-voltage discharge function is proposed. The proposed converter is able to discharge the battery until the voltage reaches to zero volts. The phase-shifted full bridge method is used to charge the battery and the current-fed push-pull method with bidirectional switches is used for the discharge. The ZVS turn-on is achieved in the charge operation and the ZVS turn-off in the discharge operation. The performance of the system is verified by the experiments using lithium-ion batteries.

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Quantitative estimation of reversibility of the discharge process undergone by nickel hydroxide film cathodically deposited on pure nickel as a positive supercapacitor electrode using cyclic voltammetry and potential drop method

  • Pyun Su-Il;Moon Sung-Mo
    • Journal of the Korean Electrochemical Society
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    • v.1 no.1
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    • pp.8-13
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    • 1998
  • This work presents the way how to evaluate the degree of reversibility of the discharging process undergone by the nickel hydroxide film cathodically deposited on pure nickel as a positive electrode for electrochemical capacitor using the combined cyclic voltammetry and potential drop method, supplemented by galvanostatic discharge and open-circuit potential transient methods. The time interval necessary just to establish the current reversal of anodic to cathodic direction from the moment just after applying the potential inversion of anodic to cathodic direction, was obtained on cyclic voltammogram. The cathodic charge density passed upon dropping the applied potential, was calculated on potentiostatic current density-time curve. Both the time interval and the cathodic charge density in magnitude can be regarded as being measures of the degree of reversibility of the discharging process undergone by the positive active material for supercapacitor, i.e. , the longer the time interval is, the lower is the degree of reversibility and the greater the cathodic charge density is, the higher is the degree of reversibility. From the applied potential dependences of the time interval and cathodic charge density, discharge at $0.42 V_{SCE}$ was determined to be the most reversible.

A Study on Electrical Degradation Properties of Epoxy Resin due to Moisture Absorption (흡습에 의한 에폭시 수지의 전기적 열화 특성에 관한 연구)

  • Lee, Sung Ill
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.9
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    • pp.656-661
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    • 2013
  • In this study, the moisture content, charge discharge current, electrostatic capacity and dielectric loss tangent are measured for the specimen of bisphenol type epoxy resin which is mixed with squared amorphous silica filler and dipped in hot water of $50^{\circ}C$ for 169 days. The results of this study are listed below. The longer of deposition day, the charge and discharge current was increased. It is considered that the reason is because there was water attack through the squared silica surface. The longer of deposition day, the absorption rate of all specimens was increased. It found that the absorption rate reached saturated state after 100 days. The higher frequency and the longer of deposition day, the $tan{\delta}$ was decreased. Also, It found that the $tan{\delta}$ and electrostatic capacity of the specimen which is mixed with squared filler are greater.

Experiment and Implementation of NiMH Battery Model for Autonomie Environment (Autonomie에 적용 가능한 NiMH 배터리 모델 실험 및 구현)

  • Lee, Jong-Kyung;Kim, Jae-Eon;Cha, Han-Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.10
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    • pp.1875-1880
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    • 2011
  • This paper proposes a battery model applicable to Autonomie environment. Also, a various of experiment is implemented for validation. The proposed battery model modifies Randles equivalent circuit and battery parameters are extracted from pulsed current tests. The parameters are two-dimensional function of current and SOC(State of Charge). The battery model is developed in the Matlab/Simulink and is implemented for NiMH Panasonic HHR650D and compared with pulsed current discharge curves. The simulation results validate the accuracy of the proposed model and the model is also tested by adding it on Autonomie for HEV application. Constant current charge/discharge, pulsed current test that can be used to extract battery parameter are performed and test results are used to build up the proposed battery model for Autonomie.