• Title/Summary/Keyword: 백 메탈

Search Result 11, Processing Time 0.031 seconds

Development of Electronic Ballast for Metal Halide Lamp wilts Free Voltage Input (프리볼트입력용 메탈핼라이드램프 전자식안정기 개발)

  • 김기정
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.16 no.1
    • /
    • pp.20-26
    • /
    • 2002
  • HID(high intensity discharge)lamps include high pressure mercury lamp, high pressure sodium lamp and metal halide lamp. Metal halide lamps have been considered to be one of the most erective light sources. These lamps have good efficiency, good color rendering and good focusing capability. The objective of this research is to alum on the metal halide lamp(MH70W) by the developed electronic ballast with free voltage input(AC 100∼277V). The developed electronic ballast consists of a free voltage input converter, a flyback converter & half-bridge inverter, ignitor & protector and control1er. Experimental results show that developed electronic ballast turns on the metal halide lamp(MH70W) with free voltage input(AC 100∼277V) very well.

Alkyl & Aryl Transfer Reactions of Trialkylborane & Triarylborane in the Presence of Metal Alkoxide to the Carbonyl Compounds Using Various Sacrificial Anodes via Electrochemical Method (메탈 알콕사이드 존재 하에서 희생 양극을 이용한 트리알킬보란 및 트리아릴보란의 카르보닐화합물로의 알킬 및 아릴 이동 반응에 대한 전기화학적 방법)

  • 최정훈;최보성;염종성;백대진
    • 한국전기화학회:학술대회논문집
    • /
    • 1998.10a
    • /
    • pp.35-35
    • /
    • 1998
  • PDF

High strength's union of mass layers metal bearing (고강성 다층 메탈베어링의 접합)

  • 전재억;황영모;김수광;계중읍;김준안;하만경
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2004.10a
    • /
    • pp.792-795
    • /
    • 2004
  • Despite is product that ship, vehicles, development equipment and Metal Bearing for plant equipment that is mass-produced by present domestic companies Cast White Metal Lining Bearing that is Bimetal Bearing standing 2 generation is accomplishing master and servant and this is foreseen to be used widely on industry whole in hereafter but Cast White Metal Bearing need minuteness processing, while price competitive power is depending on income from superior another thing area than itself manufacture already in advanced nation to lowdown that the technique is generalized widely, when take into account technology change aspect of industrial technology developing country, Go added value creation by deepening of price competition is judged to be difficult hereafter. Because domestic production and supply are wholly lacking almost in Metal Bearing Cladding that take advantage of these technology, Data-base about connection technology is weak with technique and Know-How for product. This research unites Back Steel and Aluminium Alloy different kind metal and make the Clad river studying technology about union of Gogangseong Dacheung metal bearing hereupon.

  • PDF

Design of Electronic Ballast Reducing Acoustic Resonances Phenomina in Metal Halide Discharge Tube (메탈 할라이드 방전관 내의 음향 공명을 감소시킨 전자식 안정기 설계)

  • 김기정;박종연
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.4 no.5
    • /
    • pp.405-412
    • /
    • 1999
  • Meta! Halide Discharge(]\1HD) Iamps have good color rendition, long life and good focusing capability but h have flickers bv acoustic resonances. We have designed the electronic ballast for reducing acoustic resonances in high pressure discharge tube. The ballast consists of main two parts, the first part is a half-bridge inverter to make a square wave form a and the st'Cond part is a flyback converter to combine the low frequency and high frequency component. As a r result of this study, we conclude that MHD lamps of 70 watt 따c very well light(D without acoustic resonance p phenomena by the elestronic ballast.

  • PDF

The Development of Electric Ballast for a Instant Start/Restart of Metalhalide Lamp (메탈핼라이드램프용 순시점등/재점등 전자식안정기 개발)

  • Kim, Su-Kyoung;Jang, Woo-Jin
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.18 no.5
    • /
    • pp.9-15
    • /
    • 2004
  • The most shortcoming of metalhalide lamps is what the instant restarting cannot be realized when the arc tube is in the hot condition. The discharge starting voltage of arc tube in the hot condition is much higher than in the cold condition. Therefore it takes about five minutes to restart the metalhalide lamps, that is to say, it is possible to start when the pressure and the temperature are decreased. But, if the lamp is restarted in the hot condition, we must supply the high voltage pulse with 20[kV] at the both electrode of lamp. The proposed electronic ballast is consist of a electromagnetic interference(EMI) filter, a power factor correction(PFC) circuit, a flyback converter, a half-bridge inverter, and a high voltage igniter circuit. By this composition we can start/restart the lamp with the voltage 20[kV], even if the lamp is in the hot condition.

The Research of Scratch Characteristics For Non-Vinyl Pre-Coated Metal Sheet (Non-Vinyl Pre-Coated Metal의 스크래치 특성에 관한 연구)

  • 김동환;조형근;김병민
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2000.05a
    • /
    • pp.874-877
    • /
    • 2000
  • Pre-coated sheet materials are a cost-effective and environmentally attractive alternative to conventional sheet materials coated after forming. At present but the high scratch sensitivity of coating used for pre-coated metal sheet is a major limitation to use of these materials. Because of high scratch sensitivity, products made by pre-coated metal sheet are not formed by conventional design method. This study has been performed to investigate scratch characteristic of non-vinyl pre-coated metal (PCM) sheet. Using the simple U-bending test equipment, three non-vinyls PCM's were tested. This paper provides the results of bending tests showing the influence of sheet surface texture, tool material and process conditions. It was found that the influence of punch, die clearance and tool material had an effect upon the scratch characteristic.

  • PDF

An Estimation for Efficiency of Expanded Metal for Rockfall Protection Fences (팽창메탈형 낙석방지울타리의 개발 및 성능 평가)

  • Hwang, Young-Cheol;Lee, Seung-Ho;Noh, Heung-Jea;Woo, Sang-Baek;Shin, Ju-Yul
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • 2005.03a
    • /
    • pp.153-162
    • /
    • 2005
  • The structural specification of the rockfall prevention fence installed on the road section is computed according to the hypothetic rockfall energy, and the absorbable energy of the rockfall prevention fence is defined as the sum of the absorption energies of the wire rope, one of the components, the steel support and the wire netting. But the results of the field tests confirmed that the absorption energy of the rockfall prevention fence is not the sum of the energies sustainable by the components, but it is affected by the absorbable energy of part of the components. This shows there are problems with the method of computing the absorption energy of the rockfall prevention fence of the road. So in this paper, as a way of solving the problems, the effects of improving the performance through positional changes of the existing components and the effects of improving the performance through structural changes by expanded metal are checked through tests, and a plan was proposed to solve the problems with the standards of installing the conventional rockfall prevention fence.

  • PDF

Development of Electronic Ballast for Automotive HID lamp using Holt Bridge Inverter (Half Bridge 구조를 이용한 자동차 헤드라이트용 전자식 안정기 개발)

  • 조계현;박종연;박재일
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.17 no.2
    • /
    • pp.10-16
    • /
    • 2003
  • An electronic ballast for driving automotive HID lamps is presented. The circuit topology is composed of a fly back converter, a half bridge inverter, and igniter using voltage doubler. A prototype was developed and tested on a 35W lamp with a 12V input voltage. To avoiding acoustic resonance the half bridge inverter is operated at 400Hz and provided a squared-wave voltage source to the lamp. The transient and steady state characteristics of the tested HID lapm are measured and analyzed.

Experimental Study on the Interface Bonding Characteristics of a Pin-bushing Bearing (핀부시 베어링 소재의 계면접합특성에 관한 실험적 연구)

  • Kim, Chung-Kyun;Kim, Do-Hyun
    • Tribology and Lubricants
    • /
    • v.24 no.6
    • /
    • pp.315-319
    • /
    • 2008
  • This paper presents the interface bonding characteristics between a phosphor bronze and a steel plate for pin-bush bearings. The pin-bush bearing is an important component in which is used to reduce a friction loss and a wear against the piston pin. The pin-bush bearing is manufactured by hot-pressing a phosphor bronze and a back metal of a steel plate. This paper investigated the bonding interface characteristics in which is manufactured by melting a copper based bronze and a steel plate. The hardness from the inner surface of a bronze to the outer one of steel has been measured using a Vickers hardness tester. The experimental results show that the hardness of a bronze is superior to that of the conventional bronze and the transient hardness of pin-bush bearings is gradually increasing to the hardness of the steel back metal. This means that the bonding interface zone of pin-bush bearings may be fabricated by defusing a bronze to the steel plate due to a density difference between two materials.

A Study on the Dieless Wire Drawing Using Microwave (마이크로웨이브를 이용한 Dieless Wire Drawing 에 대한 연구)

  • Huh You;Kim S.H.;Kim J.S.;Kim I.S.;Paik Y.N.
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2005.06a
    • /
    • pp.942-945
    • /
    • 2005
  • Micron-sized metal wires are widely used in industries such as filtration, catalyst and composite materials, etc. In the wire drawing process, the die that is used conventionally is an effective and, at the same time, sensitive component. However, a typical array of the dies has caused many problems in the wire drawing process, e.g., large frictional force on the interface between wire and the resulting high heat generation, precise adjustment of the dies, extended cooling system, die abrasion, etc.. Because of these problems, there have been many works that are aiming at improving the efficiency of wire drawing process by analyzing the die geometry and by applying advanced die material to prolong the die life or even at developing a dieless wire drawing system. This paper is dealing with developing a new wire drawing system that is applicable to reduce the wire drawing steps with high draw ratio. The new wire drawing system does not use the dies, but use the self-induced heater that works on the basis of the resonant phenomenon of wire material. The electromagnetic wave is the heating source. The results of the study on the diameter reduction and microwave flow analysis show that the heating effectiveness of the wire is influenced by the energy distribution in the microwave propagation chamber. We can obtain diameter-reduced wires by using microwave in the dieless drawing process. Microwave as a heating source is capable of producing wires without applying dies in wire drawing process.

  • PDF