• Title/Summary/Keyword: Discharge Time

Search Result 2,626, Processing Time 0.034 seconds

A Study on Minimum Ignition Energy by Controlled Discharge Energy (방전에너지 제어에 의한 최소점화에너지의 고찰)

  • Choi, Sang-Won;Ohsawa, Atsushi
    • Journal of the Korean Society of Safety
    • /
    • v.22 no.1 s.79
    • /
    • pp.36-39
    • /
    • 2007
  • It is important to know Minimum Ignition Energy(MIE) of flammable materials for ignition hazard of chemical processes etc.. Currently a capacitor discharge is used mainly to measure the MIE. Then, it is impossible to control actively discharge energies and discharge time because the MIE measurement uses a high voltage capacitor and fixed capacitor. However, the control of discharge energy and discharge time will be convenient if self-sustain discharge is used. In this paper, we measured the MIE by self-sustain discharge of a pulse shape to propose the new measuring method of the MIE. AS a result, ignition energies are increased gradually as discharge duration time gets longer, and discharge current grows larger. Also, an arc discharge and a glow discharge occurred during the experimental period, and the ignition by glow discharges happened when discharge duration time was $90{\mu}s$, discharge current was 8A and 1A Especially, the MIE occurred the 0.05mm and 0.08mm of the gap distance between discharge electrode in the same discharge duration time.

A Study on the Temperature-Dependent Discharge Characteristics in Alternating Current Plasma Display Panel (AC PDP의 온도에 따른 방전 특성 연구)

  • Lee, Seok-Hyun;Kim, Jee-Yong
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.56 no.3
    • /
    • pp.577-582
    • /
    • 2007
  • The plasma display panel is an image expression display using gas discharge plasma. However, gas discharge characteristics vary with temperature as gas discharge is sensitive to temperature. The discharge time lag extends a lot in low temperature and it is known as the cause which hinders high speed addressing which is essential for the size enlargement of the panel. Accordingly this research aims at identifying the temperature-dependent discharge characteristic. The lower temperature becomes, the longer addressing discharge time lag becomes. Particularly the statistical time lag extends much in low temperature. The increasing of electric field shortens discharge time lag in low temperature. Also, when priming particles are sufficiently supplied, stable discharge can be performed regardless of the influence of temperature.

A Study on the Characteristics to working Condition of STD11 in Wire-Cut EDM (Wire-Cut EDM에서 가공조건에 따른 STD11의 가공특성에 관한 연구)

  • Lee, Hong-Gil;Kim, Won-Il;Lee, Yun-Kyung;Wang, Duk-Hyun;Kim, Jong-Up
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.4 no.3
    • /
    • pp.5-12
    • /
    • 2005
  • In wire discharge machining which is using STD 11 as die materials, the major factors of machining speed are discharge voltage, discharge current, and discharge time. All of the three factors give the effect. Increasing of the discharge pulse time gets groove width wider and it relatively increases surface roughness and clearance. If no load voltage is decreased, surface roughness is good but it decreases machining speed. If on time is increased, machining speed will get faster and clearance and offset value also get bigger.

  • PDF

The relationship between the discharge characteristics and the superficial layer of MgO in AC PDP

  • Kim, Hee-Joong;Choi, Kyung-Cheol
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2002.08a
    • /
    • pp.224-227
    • /
    • 2002
  • The relationship between the discharge aging time and the superficial layer thickness of MgO thin film was investigated in an AC PDP. The discharge characteristics of an AC PDP with the various aging time were evaluated by discharge aging experiments. We find the presence of a superficial lay which is related to the discharge characteristics during aging process. The superficial layer of MgO thin film was observed by Transmission Electron Microscope (TEM). It was found that the superficial layer thickness of MgO was dependent on discharge aging time.

  • PDF

A Study on the Discharge Characteristics of Micro Dielectric Barrier Discharge Cells by Adding TiO2 or MgO Powder (TiO2 또는 MgO 첨가에 따른 마이크로 유전격벽방전 셀의 방전특성 연구)

  • Han, Chang-Wook;Wi, Sung-Suk;Lee, Don-Kyu
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.64 no.11
    • /
    • pp.1587-1591
    • /
    • 2015
  • For a higher definition discharge cell, the method of high speed addressing is necessary. In order to modify the surface charges, the liquefied $TiO_2$ or MgO powder is added on MgO layer in front glass and on the phosphor in rear glass in micro barrier discharge. Both the electro-optical properties and the discharge time lag characteristics are measured from 4 inch. test panel, such as the discharge voltage, current, luminance, luminous efficacy and discharge time lag. As the results, the statistic time lag is improved by about 40 %.

High Speed Driving Technique in AC PDPs

  • Shin, Bhum-Jae
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2007.08b
    • /
    • pp.1181-1184
    • /
    • 2007
  • The new self-priming addressing driving scheme was proposed to improve an address discharge time lag. It utilizes the priming effect maintaining the priming ramp discharge during an address period and the address discharge time lag is significantly improved. In this study, the basic characteristics of the priming ramp discharge are presented.

  • PDF

Modified Driving Method for Reducing Address Time During Subfield Time in AC PDP (플라즈마 디스플레이 패널에서 부화면 시간동안 기입시간을 단축시키기 위한 수정된 구동파형)

  • Cho, Byung-Gwon
    • Journal of the Institute of Electronics and Information Engineers
    • /
    • v.52 no.1
    • /
    • pp.135-139
    • /
    • 2015
  • The address discharge time lags are investigated in each subfield time in AC plasma display panel and a modified driving waveform is proposed to reduce the address discharge time lag by applying different additional scan voltage under no misfiring discharge production. The weak plasma discharge in AC PDP is generated by applying high positive-going ramp waveform to the scan electrode during the first reset period and that induce the production of the priming particle and wall charge. Because the wall charge becomes the wall voltage in a cell, the wall plus external address voltage produce the address discharge. However, as the wall charge in a cell is gradually disappeared as time passed, the address discharge time in the subfield time for 1 TV frame is lagged. In the first subfield time, the address discharge is faster produced than the other subfield time because the wall charge are much remained by the high positive-going ramp voltage during the reset period in the first subfield time. Meanwhile, from the second to last subfield, the address discharge production time is gradually delayed due to the dissipation of the wall charge in a cell. In this study, the address discharge time lags are measured in each subfield time and the total address discharge time lags are shortened by applying the different additional scan voltage during the address period in each the subfield time.

Relationship between Image Retention and Time Lag in an AC PDP

  • Do, Yun-Seon;Jang, Cheol;Choi, Kyung-Cheol
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2007.08a
    • /
    • pp.613-616
    • /
    • 2007
  • Characteristics of dark image retention and address discharge time lag were investigated simultaneously. It was found that reset waveforms with low black luminance did not guarantee lower image retention. Improved address discharge time lag due to modified reset waveforms similarly did not show improved image retention. The address discharge time lag and the image retention are in a trade-off relation.

  • PDF

AC PDP(Plasma Display Panel)의 방전 특성 해석

  • 황기웅;정희섭;서정현
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • 1997.07a
    • /
    • pp.173-176
    • /
    • 1997
  • A numerical analysis of the micro-discharge in an AC pplasma dispplay cell has been made using time-deppendent, 2-dimensional multi-fluid equations to understand the discharge pphysics of He-Xe discharge. The time deppendent distribution of the electron tempperature, densities of electrons, various ions and excited sppecies, and the effects fo the wall charge accumulated on the dielectric surface are obtained and comppared with the results of direct observation of time deppendent behavior of VUV and visible sppectra from single discharge cell observed using a gated, image intensified CCD to elucidate the discharge physics.

  • PDF

The Delay-Time Characteristics of DC Discharge in the Discharge Logic Gate Plasma Display Panel (방전논리게이트 플라즈마 디스플레이 패널의 직류방전 지연특성)

  • Ryeom, Jeong-Duk;Kwak, Hee-Ro
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.21 no.1
    • /
    • pp.28-34
    • /
    • 2007
  • In this research, the characteristics of the DC discharge that was the logical gate input of discharge logic gate PDP newly proposed was considered. The logical output is induced by controlling the potential difference of inter-electrode according to the discharge path in the discharge logic gate. From the experimental result the discharge time lag was shortened to 1/3 and the voltage has decreased to 1/2 in the case to apply priming discharge for improving stability of these DC discharges compared with the case when it is not applied. Moreover, after the priming discharge ends, the space charge generated by this discharge influences it up to about $30[{\mu}s]$. And, as a measured result of the influence that the space charge exerts on the DC discharge with the change in time and spatial distance, it has been understood that there is a possibility that going away spatially can slip out the influence of the discharge easily as for going away from the discharge time-wise. Therefore the conclusion that the discharge logic gates of each scanning electrode can be operated independently is obtained.