• Title, Summary, Keyword: Power EL

Search Result 193, Processing Time 0.054 seconds

Inverter Design and Control for Driving Electro-Luminescence Sheet (EL 시트 구동을 위한 인버터의 설계 및 제어)

  • Lee, Seung-Yo
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.14 no.5
    • /
    • pp.355-364
    • /
    • 2009
  • Electro-Luminescence (EL) sheets have been widely used in lighting displays, mainly used as advertisement panels. To drive the ELs in optimal conditions, it is required to understand the load profile of the EL. Hence, in this paper, a modeling for an EL sheet was performed to analyze the load characteristics of the EL. Based on the extracted model of the EL, a topology for inverter system was chosen and the optimal design parameters were obtained. The validity of the designed EL driver system was verified through computer simulations and experiments.

High brightness property of Power Electroluminescent Device using ZnS:Cu (ZnS:Cu를 이용한 후막 전계발광소자의 고휘도 특성)

  • Lee, Jong-Chan;Park, Dae-Hui
    • The Transactions of the Korean Institute of Electrical Engineers C
    • /
    • v.48 no.5
    • /
    • pp.349-353
    • /
    • 1999
  • In this paper, to fabricate the AC power electroluminescent device (PELD) with high brightness, new structure that constructed single emissive layer between electrodes was proposed. Dielectric and phosphor material structure that constructed single emissive layer between electrodes was proposed. Dielectric and phosphor material were BaTiO3 and ZnS:Cu respectively. Fabricated AC power EL devices were estimated by optical and electrical properties of EL spectrum, brightness, CIE coordinate system, transferred charge density and EL emission wave in time domain. With above results, we found that brightness of newly proposed AC powder EL power EL device was 2754 cd/m2 at 100V, 400 Hz and compared with conventional device structure.

  • PDF

A Development of Distributed Parallel Processing algorithm for Power Flow analysis (유기EL과 무기EL에 관한 연구)

  • Lee, Han-Sung
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.67-71
    • /
    • 2001
  • Nowdays, we can communicate using Information Technology such as internet, personal computer, mobile phone etc. To protect global environment, it is also reqired to invent products efficiently reduce energy consumption. here, I studied organic EL and inorganic EL because organic EL display is appropriate device as light, thin, energy-saying display following CRT, LCD. As a result, I realized that we are supposed to study more on invention, efficiency and mass-production of materials. Comparing with another display, however, it would be marketable in few years, considering short history of its full-scaled studies.

  • PDF

Energy Transfer Phenomenon in Organic EL Devices Having Single Emitting Layer (단층형 유기 EL 소자의 에너지 전달 특성에 관한 연구)

  • Kim, Ju-Seung;Seo, Bu-Wan;Gu, Hal-Bon;Lee, Kyung-Sup
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.331-334
    • /
    • 2000
  • The organic electroluminescent(EL) device has gathered much interest because of its large potential in materials and simple device fabrication. We fabricated EL devices which have a blended single emitting layer containg poly(Nvinylcarbazole)[PVK] and poly(3-dodecylthiophene)[P3DoDT]. The molar ratio between P3DoDT and PVK changed with 1:0, 2:1 and 1:1. To improve the external quantum efficiency of EL devices, we applied insulating layer, LiF layer between polymer emitting layer and AI electrode. All of the devices emit orange-red light and it's can be explained that the energy transfer occurs from PVK to P3DoDT. Within the molar ratio 1:0, 2:1 and 1:1, the energy transfer was not saturated, which results in the not appearance of PVK emission in the blue region. In the voltage-current and voltage-light power characteristics of devices applied LiF layer, current and light power drastically increased with increasing with applied voltage. In the consequence of the result, the light power of the device have a molar ratio 1:1 with LiF layer was about 10 times larger than that of the device without PVK at 6V.

  • PDF

THE SHORT-TERM EFFECTS OF LOW-DOSE-RATE RADIATION ON EL4 LYMPHOMA CELL

  • Bong, Jin-Jong;Kang, Yu-Mi;Shin, Suk-Chul;Choi, Moo-Hyun;Choi, Seung-Jin;Lee, Kyung-Mi;Kim, Hee-Sun
    • Journal of Radiation Protection and Research
    • /
    • v.37 no.2
    • /
    • pp.56-62
    • /
    • 2012
  • To determine the biological effects of low-dose-rate radiation ($^{137}Cs$, 2.95 mGy/h) on EL4 lymphoma cells during 24 h, we investigated the expression of genes related to apoptosis, cell cycle arrest, DNA repair, iron transport, and ribonucleotide reductase. EL4 cells were continuously exposed to low-dose-rate radiation (total dose: 70.8 mGy) for 24 h. We analyzed cell proliferation and apoptosis by trypan blue exclusion and flow cytometry, gene expression by real-time PCR, and protein levels with the apoptosis ELISA kit. Apoptosis increased in the Low-dose-rate irradiated cells, but cell number did not differ between non- (Non-IR) and Low-dose-rate irradiated (LDR-IR) cells. In concordance with apoptotic rate, the transcriptional activity of ATM, p53, p21, and Parp was upregulated in the LDR-IR cells. Similarly, Phospho-p53 (Ser15), cleaved caspase 3 (Asp175), and cleaved Parp (Asp214) expression was upregulated in the LDR-IR cells. No difference was observed in the mRNA expression of DNA repair-related genes (Msh2, Msh3, Wrn, Lig4, Neil3, ERCC8, and ERCC6) between Non-IR and LDR-IR cells. Interestingly, the mRNA of Trfc was upregulated in the LDR-IR cells. Therefore, we suggest that short-term Low-dose-rate radiation activates apoptosis in EL4 lymphoma cells.

A Study on the Characteristic for EL Driving Resonant Inverter (EL 구동용 공진형 인버터 특성에 관한 연구)

  • 윤석암
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.380-383
    • /
    • 2000
  • This paper presents about EL(electro-luminescent) driver with inverter Inverter is constructed by using characteristic of FET and its output characteristics is analysed for the variation of gate bias frequency and load. The optimum operating condition of inverter is that the gate bias frequency of FET equal two resonant frequency of circuit.

  • PDF

Theoretical and Experimental Analysis of Extremely Low Frequency Magnetic Field in the Vicinity of the Transformer Station of Overhead Power Lines

  • Ghnimi, Said;Rajhi, Adnen;Gharsallah, Ali;Bizid, Youssef
    • Journal of Electrical Engineering and Technology
    • /
    • v.13 no.4
    • /
    • pp.1655-1662
    • /
    • 2018
  • This paper studies the magnetic fields between the power lines which are finite length and other ones which are infinitely long around the first tower in the proximity of the power transformers. They will be used as a source of disturbance applied to the power line. The method applied in this study was gradual; develop the theoretical formulation of the magnetic fields of these lines which are finite length and other ones which are infinitely long, examine the effects of different couplings between the different neighboring lines and the distribution transformers on behavior of magnetic fields. The method also focused on the experimental results analyzing the magnetic fields which will be used as a source applied to the auditory implants EMC. The theoretical and experimental results were compared and discussed for three power lines (90kV, 150kV and 225kV) near the power station, and it proved the effect of these substations on the simulated and measured results of the magnetic field. The maximum intensities of magnetic fields measured at the height of 1m from the ground for the circuit of three lines close to each substation were significantly lower than the ICNIRP reference levels for occupational and non occupational exposures.

Characterization and Performance Evaluation of Advanced Aircraft Electric Power Systems

  • Eid, Ahmad;El-Kishky, Hassan;Abdel-Salam, Mazen;El-Mohandes, Mohamed T.
    • Journal of Power Electronics
    • /
    • v.10 no.5
    • /
    • pp.563-571
    • /
    • 2010
  • A model of an advanced aircraft electric power system is developed and studied under variable-speed constant-frequency (VSCF) operation. The frequency of the generator's output voltage is varied from 400-Hz to 800-Hz for different loading scenarios. Power conversions are obtained using 12-pulse power converters. To reduce the harmonic contents of the generator output waveforms, two high-pass passive filters are designed and installed one at a time at the generator terminals. The performance of the two passive filters is compared according to their losses and effectiveness. The power quality characteristics of the studied VSCF aircraft electric power system are presented and the effectiveness of the proposed filter is demonstrated through compliance with the newly published aircraft electrical standards MIL-STD-704F.

Dependance on Metal Electrode of Poly(3-hexylthiophene) EL Device (Poly(3-hexylthiophene) 발광소자의 금속전극 의존성)

  • 서부완;김주승;김형곤;이경섭;구할본
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.162-165
    • /
    • 2000
  • To investigate the effect of metal electrode in electroluminescent[EL] devices, we fabricated EL devices of ITO/P3HT/Al, ITO/P3HT/LiF/Al and ITO/P3HT/Mg:In structure. In current-voltage-light power characteristics, turn-on voltage of EL devices using LiF insulating layer and Mg:In(2.8V) metal electrode is lower than EL device using Al(4.2V). Besides the external quantum efficiency is improved also. The reason is related to carrier mobility and carrier injection, which would affect the hole-electron balance. In the device with Al electrode, holes injected from indium-tin-oxide[ITO] to poly(3-hexylthiophene)[P3HT] might reach the Al electrode without interacting with injected electrons, because the electron injection efficiency was very low for this electrode. Besides oxidation of the Al electrode is likely due to holes reaching the cathode without meeting injected electrons. Another possible reason for the higher EL efficiency may be the insulating layer playing the role of a tunneling barrier for holes to the Al electrode. In all EL devices, the orange-red light was clearly visible in a dark room. Maximum peak wavelength of EL spectrum emitted at 640nm in accordance with photon energy 1.9eV

  • PDF

Effects of Organic Binder and Film Thickness on Optoelectrical Properties of AC Powder EL Devices Prepared by Screen Printing Method for LCD Backlight Applications (LCD 백라이트를 위해 스크린 프린팅법으로 제조된 AC Powder EL 소자의 유기결합제와 막두께가 광전기적 성질에 미치는 영향)

  • Lee, Kang-Ryeol;Park, Sung
    • Journal of the Korean Ceramic Society
    • /
    • v.38 no.12
    • /
    • pp.1085-1092
    • /
    • 2001
  • The high efficient AC powder EL devices classified by low cost and low power consumption type fabricated using screen printing method with film thickness and organic binder. Brightness and current density were measured at frequency range of 400Hz∼1kHz and voltage range of 50∼300V$\_$rms/ to estimate optoelectrical properties of AC powder EL devices, respectively. Frequency generator was used as system producing frequency and voltage of a sine wave. Also brightness and current density were measured by luminometer and multimeter. In the case of low cost type AC powder EL device, brightness and current density were about 43 cd/m$^2$and 20$\mu$A/cm$^2$when the thickness of phosphor and dielectric layer was 45∼50$\mu$m under no addition of plasticizer respectively. In the case of low power consumption type AC powder EL device, brightness and current density were about 74 cd/m$^2$and 30∼40$\mu$A/cm$^2$when the thickness of phosphor and dielectric layer was 45∼50$\mu$m and 15∼20$\mu$m under addition of 15wt% plasticizer respectively. Also, AC powder EL device fabricated in this study showed absolutely excellent characteristics as the lifetime was longer than products of other company.

  • PDF