• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 전력전자학술대회 논문집
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• pp.433-437
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• 1998

Equalize SOC of the cell which effect on the charge.discharge ability and the efficiency of the battery, through the charge.discharge characteristic test of the battery source, and develope the high efficiency charge.discharge system in the series HEV have a constant engine-generator output. For this, in this paper, establish the electrical model and the condition of high efficiency charge.discharge, and proposed the improvement method of charge.discharge characteristic in the battery source that consist of twenty Ni-MH cells connected serial/parallel

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
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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.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.554-559
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• 1998

Equalizing the state of charge of cell that affects the charge/discharge quality and efficiency of the battery through the charge/discharge characteristic experiments of battery source, we develope the high efficiency charge/discharge system which would be used in serial HEV with the constant engine-generator output. For this, establishes the electrical model of Ni-MH battery appropriate to the high efficiency charge/discharge conditions. There is no model of Ni-MH cell, so we used Ni-Cd model and obtain the Ni-MH model through the experiment. A reason that each cell has the same charge/discharge property for applying the cell model to serial/parallel connected battery source extensively is needed. Therefore, in this paper, propose the Ni-MH charger/discharger has the equalization charging function and selectable cut-off function.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2002년도 학술대회논문집
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• pp.29-33
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• 2002

Period which does an electric condition of panel in reset in the driving method of PDP is reset period. This research experimentally analyzed the priming discharge characteristic of reset period. The amount of wall charge and the accumulation time accumulated by priming discharge are unrelated to width of priming pulse. And, self-erase discharge has the relation in the amount of wall charge by priming discharge. Then, it relates also to space charge generated by priming discharge. Moreover, space charge which helps self-erase discharge exists to about 22$mutextrm{s}$ after generating priming discharge. And, it is suitable within 12$mutextrm{s}$ of priming pulse width for efficient reset.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
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• pp.539-540
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• 2006

In this paper, We examine that characteristics of formative electret with polymer film and electric charge storage using grid corona discharge. compound polymer of fluorine resin used for material in electret because of high electric charge accumulation, excellent electrical and physical characteristic. All experiments were carried out with circular samples of $Teflon^(R)FEP$ film, 12.5[${\mu}m$] thick. As experiment variables, we used voltage, electrode thickness, discharge electrode gap, and discharge time. According to this variables, we studied on characteristics of formative electret and electric charge storage. Additionally we make a comparative study of the result between the grid corona discharge and needle electrode discharge.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 추계학술대회 논문집
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• pp.369-372
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• 1996

We prepared LiMn$_2$O$_4$ by reacting stoichiometric mixture of LiOH.$H_2O$ and MnO$_2$ (mole ratio 1 : 1) and heating at 80$0^{\circ}C$ for 24h, 36h, 48h, 60h and 70h. We obtained through X-ray diffraction that lattice parameter varied as function of heat treatment time. heated cathode active materials at 80$0^{\circ}C$ for 36h, (111)/(311) peak ratio was 0.37. It expected good charge/discharge characteristics. When (111)/(311) peak ratio was 0.37, it will be that crystal structure is farmed very well. In the result of charge/discharge test When heated at 80$0^{\circ}C$ for 36h, charge/discharge characteristic of LiMn$_2$O$_4$is the most property. It agree with our expectation.

• 한국정보통신학회논문지
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• 제21권5호
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• pp.885-892
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• 2017

본 논문에서는 기존 전원차단회로의 공급전원 차단 복귀 시간 지연 문제를 해결하기 위하여 고속 방전 충전 스위칭 기능을 갖는 새로운 전원차단회로를 제안하였다. 제안된 전원차단회로는 공급전원 고속 차단 후 복귀(충전) 속도를 증가시키도록 설계함으로써 전자시스템의 방사선 노출 시간과 펄스 방사선이 지나간 후 정상동작하기 위한 시간을 줄였다. 하드웨어를 구현하기 전 방전 충전 시간의 시뮬레이션은 Cadence 사의 pspice tool을 이용하여 진행하였으며 소자레벨에서 DUT(Device Under Test) 보드를 제작하였다. 전원차단회로의 비교 측정은 24V용 인공위성 전자소자를 대상으로 수행되었다. 그 결과, 제안된 회로는 기존 회로에 비하여 방전속도 96.8%, 복귀속도 27.3% 향상으로 고속 기능이 구현됨을 확인하였다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제53권12호
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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.

• 조명전기설비학회논문지
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• 제17권2호
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• pp.17-22
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• 2003

본 연구에서는 mP의 ADS 구동방식에서 초기화기간의 프라이밍 방전 특성에 대하여 실험적인 해석을 하였다. 방전에 의해 축적되는 벽전하의 총량과 벽전하가 축적되는 시간은 프라이밍 펄스의 폭과 무관하다. 또한 과잉 벽전하에 의한 자기소거 방전은 프라이밍 방전에 의한 벽전하량과 관계가 있으며 또한 프라이밍 방전에 의해 생성되는 공간전하와도 관계가 있다. 실험결과 프라이밍 펄스 폭은 8[$\mu\textrm{s}$], 전압은 163[V] 정도가 최적이다. 그리고 자기소거방전을 돕는 공간전하는 파라이밍 방전이 발생한 직후로부터 약 16[$\mu\textrm{s}$] 동안 존재한다. 그러므로 효과적인 초기화 과정을 위한 프라이밍 펄스의 폭은 16[$\mu\textrm{s}$] 이내가 적당하다.

• 한국수소및신에너지학회논문집
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• 제10권3호
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• pp.177-184
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• 1999

The charge-discharge characteristics of the $Mg_2Ni-x$ wt.%Nd (x = 0~3) electrodes were investigated. The electrodes were prepared by the mechanical grinding of the induction-melted $Mg_2Ni$ alloy powders with Ni and/or Nd using planetary ball mill apparatus. The discharge capacity of the $Mg_2Ni$ alloy increased with the increase in the nickel content. The electrode possessing 100 wt.% nickel powder showed the initial capacity of 760 mAh/g and the capacity decay with the cycle number was less than that of the 55 wt.% nickel powder. The Nd was added to this composition. It was found that the $Mg_2Ni-100$ wt.%Ni -0.2 wt.%Nd alloy showed an excellent charge-discharge cycle characteristics compared with the other reported Mg-Ni alloy system. The discharge capacity was 400 mAh/g after 70 cycles. Such an improved cycle life seems to be attributed to the improvement in the corrosion characteristics of the alloy. The anodic polarization curve of the $Mg_2Ni-100$ wt.%Ni-0.2 wt.%Nd alloy exhibited better passivating behavior than that of the $Mg_2Ni-100$ wt.%Ni.