• 제목/요약/키워드: operation principle

검색결과 896건 처리시간 0.03초

A Highly Efficient AC-PDP Driver Featuring an Energy Recovery Function in Sustaining Mode Operation

  • Kang, Feel-Soon;Park, Sung-Jun;Kim, Cheul-U
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • 제2B권3호
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    • pp.100-108
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    • 2002
  • A simple sustain driver employing an energy recovery function is proposed as a highly efficient driver of a plasma display panel. The proposed driver uses dual resonance in the sustaining mode operation: a main resonance between an inductor and an external capacitor to produce alternative pulses and a sub-resonance between an inductor and a panel to recover the energy consumption by the capacitive displacement current of the PDP. The operational principle and design procedure of the proposed circuit are presented with theoretical analysis. The operation of the proposed sustain driver is verified through simulation and experiments based on a 7.5-inch-diagonal panel with a 200 KHz operating frequency.

배전계통에서 분산전원 운전가능 범위에 대한 연구 (A Study on Permissible Operation Limit of Distributed Generation System in Distribution System)

  • 정원재;김태응;김재언
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 A
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    • pp.19-21
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    • 2001
  • Nowadays, small scale DGS(Distributed Generation System), as a wind power generation or photovoltaic generation, becomes to be introduced into the power distribution system. But in that case it is difficult to properly maintain the terminal voltage of low voltage customers by using only LDC(Line Drop Compensator). So, it is necessary to determine the permissible operation limit of the introduced DGS for proper voltage in distribution system. In this paper clarifies the relationship between LDC voltage regulation principle and real, reactive power of DGS, and examines the permissible operation limit of the introduced DGS in distribution system which the voltage is controlled by LDC.

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건물용 종합에너지시스템 구성요소의 최적 투자모형에 관한 연구 (A Study on the Optimal Planning Model of Building Integrated Energy System's Components)

  • 서상욱;박종성;장승찬;김정훈
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 D
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    • pp.797-799
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    • 1997
  • This paper presents an operation and planning model of integrated energy systems which consist of small scale cogeneration systems, thermal accumulator, ice storage and electrical energy storage systems. In the proposed planning model, an optimization of total cost which contains investment, operation, thermal shortage and salvage costs has carried out with the maximum principle based on the lifetime of each system component and unit price per capacity. From this model, optimal investment capacity per annum can be determined during the studied periods using the marginal costs according to the operation characteristics of each system component.

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正面 밀링 作業에서 動切削力의 解析 (An Analysis of the Dynamic Cutting Force on Face Milling Operation)

  • 김희술;이상석;이병철
    • 대한기계학회논문집
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    • 제16권12호
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    • pp.2268-2278
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    • 1992
  • 본 연구에서는 기존의 정절삭력 모델을 이용하여 절삭과정에서 발생되는 동적 인 특성과 공작기계의 구조적인 특성이 상호작용되어 발생되는 절삭력 변동성분들이 고려된 절삭력 모델 즉 동절삭력 모델을 개발하여서 이 모델로부터 예측된 절삭력과 절삭실험 결과를 비교, 분석하여 제시한 모델의 타당성 및 동절삭력 특성을 검토하고 자 한다.

Selective Dual Duty Cycle Controlled High Frequency Inverter Using a Resonant Capacitor in Parallel with an Auxiliary Reverse Blocking Switch

  • Saha, Bishwajit;Suh, Ki-Young;Kwon, Soon-Kurl;Mishima, Tomokazu;Nakaoka, Mutsuo
    • Journal of Power Electronics
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    • 제7권2호
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    • pp.118-123
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    • 2007
  • This paper presents a new ZCS-PWM high frequency inverter. Zero current switching operation is achieved in the whole load range by using a simple auxiliary reverse blocking switch in parallel with series resonant capacitor. Dual duty cycle control scheme is used to provide a wide range of high frequency AC output power regulation that is important in many high frequency inverter applications. It found that a complete soft switching operation can be achieved even for low power setting ranges by introducing high-frequency dual duty cycle control scheme. The proposed high frequency inverter is more suitable for consumer induction heating(IH) applications. The operation and control principle of the proposed high frequency inverter are described and verified through simulated results.

A Novel Power Frequency Changer Based on Utility AC Connected Half-Bridge One Stage High Frequency AC Conversion Principle

  • Saha Bishwajit;Koh Kang-Hoon;Kwon Soon-Kurl;Lee Hyun-Woo;Nakaoka Mutsuo
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2006년도 전력전자학술대회 논문집
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    • pp.203-205
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    • 2006
  • This paper presents a novel soft-switching PWM utility frequency AC to high frequency AC power conversion circuit incorporating boost-half-bridge inverter topology, which is more suitable and acceptable for cost effective consumer induction heating applications. The operating principle and the operation modes are presented using the switching mode and the operating voltage and current waveforms. The performances of this high-frequency inverter using the latest IGBTs are illustrated, which includes high frequency power regulation and actual efficiency characteristics based on zero voltage soft switching (ZVS) operation ranges and the power dissipation as compared with those of the previously developed high-frequency inverter. In addition, a dual mode control scheme of this high frequency inverter based on asymmetrical pulse width modulation (PWM) and pulse density modulation (PDM) control scheme is discussed in this paper in order to extend the soft switching operation ranges and to improve the power conversion efficiency at the low power settings. The power converter practical effectiveness is substantially proved based on experimental results from practical design example.

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펄스전력용 광점호 싸이리스터의 특성 연구 (A Study on Characteristics of Light Triggered Thyristor for Pulsed Power Application)

  • 이병하;김진성;김영배;차한주
    • 전기학회논문지
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    • 제59권4호
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    • pp.762-767
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    • 2010
  • This paper describes characteristic of a light triggered thyristor investigated by experiment to adopt it into a main switch of a pulsed power unit. Triggering principle of the light triggered thyristor are referred with its structure and equivalent circuit. Operational principle and simulation result of a capacitive pulsed power circuit are explained. A variety of triggering conditions of triggering circuit and characteristics on turn-on, turn-off, voltage dividing in series operation, overvoltage protection function of the light triggered thyristor are investigated by experiments. Experimental result of 40 kJ pulsed power unit using the light triggered thyristor is presented.

제어이론을 이용한 D급 디지털 오디오 증폭기의 모델링과 해석 (Modeling and Analysis of Class D Audio Amplifiers using Control Theories)

  • 류태하;류지열;도태용
    • 제어로봇시스템학회논문지
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    • 제13권4호
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    • pp.385-391
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    • 2007
  • A class D digital audio amplifier with small size, low cost, and high quality is positively necessary in the multimedia era. Since the digital audio amplifier is based on the PWM signal processing, it is improper to analyze the principle of signal generation using linear system theories. In this paper, a class D digital audio amplifier based ADSM (Advanced Delta-Sigma Modulation) is considered. We first model the digital audio amplifier and then explain the operation principle using variable structure control algorithm. Moreover, the ripple signal generated by the hysteresis in the comparator has a significant effect on the system performance. Thus, we present a method to find the magnitude and the frequency of the ripple signal using describing function. Finally, simulations and experiments are provided to show the validity of the proposed methods.

축소형 자기부상열차 운행 시스템 개발 (Development of small-scaled Magnetically Levitated Train operation system)

  • 성호경;정병수;장석명
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2004년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.256-258
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    • 2004
  • It is not easy to apply new algorithm to the vehicle under driving test because the principle and moving characteristic of Magnetically Levitated Train(Maglev) developed in KIMM have been not easily analyzed yet. So, in this paper the small-scaled Maglev which can experiment economically and analyze moving-characteristic is proposed. Proposed small-scaled Maglev have the same principle and function as that of Maglev but it is smaller than real system at the ration of 1 to 7.

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비전기 뇌관의 발파와 기본 설계 및 시공 (Blasting Utilizing Non-electric Detonator and Its Principle Planning and Operation)

  • 최영천
    • 화약ㆍ발파
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    • 제22권4호
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    • pp.23-29
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    • 2004
  • 비전기 뇌관은 전기뇌관의 단점을 보완하기 위하여 개발한 뇌관이다. 외부전기로 인한 기폭위험으로부터 전기뇌관보다 더욱 안전한 뇌관으로 각광을 받고 있으며. 또한 정밀한 시차, 발파진동, 소음의 감소효과와 노천 및 터널 발파에서 다량발파에 이용되고 있는 비전기 뇌관의 기폭시스템 및 기본적인 사용방법과 설계 및 시공사례를 소개함으로써 국내발파 기술향상에 도움이 되고자 한다.