• 제목/요약/키워드: Modulation method

검색결과 304건 처리시간 0.302초

다중 변조식 메탈 할라이드 램프용 고주파 전자식 안정기 (An Electronic Ballast Using A Multiplex Modulation Method for The Metal Halide Lamp)

  • 오덕진;김희준;오원석;조규민
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 B
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    • pp.1129-1133
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    • 2002
  • This paper presents an electronic ballast using a novel multiplex modulation method for the metal halide lamp. The proposed modulation method, which has a modulating signal of swept multiplex frequency, can eliminate the acoustic resonance more effectively than the conventional modulation method, which has a modulating signal of constant frequency. For the purpose of future application specific integrated circuits (ASIC), the controller of the proposed ballast has been designed only with erasable programmable logic devices (EPLDs), but without a microprocessor. In this paper, detailed proposed modulation schemes are described and experimental results on the proto-type 150W metal halide lamp ballast with the proposed modulation method are discussed.

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메탈 할라이드 램프용 전자식 안정기의 고주파 복합 변조법 (A High Frequency Complex Modulation Method of the Electronic Ballast for Metal Halide Lamps)

  • 오덕진;김희준;조규민
    • 전자공학회논문지SC
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    • 제40권3호
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    • pp.215-224
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    • 2003
  • 본 논문은 새로운 복합 변조방식에 의해 구동되는 메탈 할라이드 램프용 고주파 전자식 안정기에 관한 것이다. 제안하는 변조방법의 경우, 변조신호가 스위프되는 복합 주파수를 갖기 때문에, 일정한 주파수의 변조신호를 갖는 통상의 변조방법 보다 더욱 효과적으로 공명현상을 회피할 수 있다 차후 ASIC을 목적으로, 제안하는 안정기의 제어기는 마이크로프로세서를 사용하지 않고 EPLD만을 사용하여 설계하였다. 본 논문에서는 제안하는 변조방법의 구체적 알고리즘 및 제안하는 변조방법을 적용한 제어기프로토타입의 150 W 메탈할라이드 램프용 안정기로 수행된 실험결과를 기술하였다.

캐리어를 이용한 매트릭스 컨버터의 전압 변조 방법 (Carrier-based Modulation Method for Matrix Converter)

  • 윤영두;설승기
    • 전력전자학회논문지
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    • 제10권6호
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    • pp.543-549
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    • 2005
  • 본 논문에서는 캐리어(Carrier)를 이용한 매트릭스 컨버터(Matrix Converter)의 전압 변조 방법을 제안한다. 출력상전압에 적절한 옵셋(Offset) 전압을 더하고, 캐리어 파형의 기울기를 적절히 제어함으로써 입력 전류를 역율 1의 정현파로 제어하면서 동시에 출력 전압의 합성이 가능하다. 이 방법은 기존의 매트릭스 컨버터 전압 변조 방법인 SVPWM과 동일한 스위칭 패턴을 나타내지만, 그 구현은 훨씬 간단한다. 또한 기존의 전압형 인버터(Voltage Source Inverter, VSI)에서 발전된 2상/3상 변조, 과변조(Over Modulation) 등의 개념을 유사하게 적용할 수 있어 그 활용도가 매우 논다. Matlab/Simulink를 이용한 시뮬레이션 결과와 실험을 통해 제안된 방법의 타당성을 검증하였다.

전압 변조 방법에 따른 단상 5-레벨 NPC 태양광 인버터의 전력 손실 및 열 부하 분석 (Effect of Pulse Width Modulation Methods on Power Losses and Thermal Loadings of Single-Phase 5-Level NPC Inverters for PV Systems)

  • 류태림;최의민
    • 전력전자학회논문지
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    • 제27권1호
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    • pp.56-62
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    • 2022
  • In this paper, the effect of pulse width modulation methods on thermal loadings and power losses of single-phase five-level NPC inverters for photovoltaic systems are analyzed. The pulse width modulation methods affect the power losses of the NPC inverters and thus lead to different thermal loadings of NPC inverters. To identify the reliability-critical power device with respect to thermal stress, the thermal loadings of I- and T-type NPC inverters are analyzed by applying the unipolar pulse modulation method. Then, the effect of the discontinuous pulse width modulation method on power losses and thermal loadings of power devices of I- and T-type NPC inverters are analyzed. Finally, the operation of NPC inverters applying the discontinuous pulse modulation method is confirmed by experiments. The results show that the discontinuous pulse modulation method is able to improve the reliability of NPC inverters by reducing thermal loadings of reliability-critical power devices and it is more effective for T-type NPC inverters than I-type NPC inverters.

3상 매트릭스 컨버터의 고효율 변조방법 설계 및 시뮬레이션 (Design and Simulation of High Efficiency PWM Modulation Method for Three-phase Matrix Converter)

  • 임현주;차한주
    • 전력전자학회논문지
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    • 제17권4호
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    • pp.337-344
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    • 2012
  • A matrix converter is used for converting AC/AC power directly. In order to generate sinusoidal input/output waveform in matrix converter, it uses nine bidirectional switches and PWM modulation. This paper presents an analytical averaged loss model of matrix converter with DDPWM(direct duty ratio PWM) and proposes a new switching method for reducing switching losses. A Mathematical loss models with average magnitude of voltage/current are classed as conduction and switching loss. The proposed switching pattern is improved with existing DDPWM. To prove improved efficiency with proposed DDPWM, this paper compares losses between suggested switching pattern and conventional switching pattern using mathematical and simulation method. Each loss types are influenced by environmental factors such as temperature, switching frequency, output current and modulation method.

원전구조물 부위별 철근모듈화 방안 연구 (The Rebar Modulation Method in the Area of the Nuclear Power Plant Structures)

  • 이병수;방창준;김석철;임상준;박종혁
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2013년도 추계 학술논문 발표대회
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    • pp.15-16
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    • 2013
  • Because of the complicated shape and the overcrowded arrangement of rebar, there are some problems in applying the rebar modulation for the Nuclear Power Plant Structures. In order to resolve these problems, we have been studying the rebar modulation method applying techniques of the high strength rebar for NPP Structure. After reviewing the rebar drawing of the NPP structures and performing the mock-up test, the rebar modulation method in the various area of the NPP Structure has been established. I will introduce this method and the future plan of the research.

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메탈 할라이드 램프용 전자식 안정기의 고주파 변조 방식에 관한 연구 (Study on The High Frequency Modulation Method for The Metal Halide Lamp Elec)

  • 문태환;오덕진;김희준;조규민
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.208-211
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    • 2001
  • This paper presents the considerations of the high frequency modulation method for the metal halide lamp electronic ballast. The acousitc resonance phenomenon is occurred, if the metal halide lamp is driven at constant high frequency. The frequency modulation method therefore, is used to avoid the acoustic resonance phenomenon, but the crest factor of lamp current is increased. In this paper, the driving characteristic of the metal halide lamp according to the waveshape and frequency variations of modulating signal is considered with a viewpoint of crest factor.

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보조 커플드-인덕터를 이용한 ZVT 인터리브드 DC/DC 컨버터의 주파수 변조 기법 (Frequency Modulation Method of ZVT Interleaved DC/DC Converter Using Auxiliary Coupled-Inductor)

  • 이종영;이순령;이강현;원충연;이제현;조보형
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2016년도 추계학술대회 논문집
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    • pp.1-2
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    • 2016
  • This paper presents frequency modulation method of zero-voltage-transition interleaved DC/DC converter using auxiliary coupled-inductor. In conventional ZVT interlaved converter without semi-conductor devices in auxiliary circuit, the peak-to-peak value of coupled-inductor current has fixed value despite the change of load current. Then, as the load is reduced, the efficiency is reduced because of the conduction loss. The proposed frequency modulation method can reduce the conduction loss by controlling the current of coupled-inductor as the load condition using frequency modulation. The proposed method is verified by experimental results.

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내잡음성 저속 전력선 모뎀의 구현 (Embodiment of the Power-Line Modem for high noise environment)

  • 여진기;이승민;이흥호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 합동 추계학술대회 논문집 정보 및 제어부문
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    • pp.558-561
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    • 2002
  • In the embodiment of power line modem, the important elements are selection of a suitable line-coupler, choice of a modulation method good for channel environments, and an efficient data coding method etc. In this paper an appropriate modulation method was implemented their results in details and verified by the simulations. The data compensation request techniques that uses error checking was discussed. Finally, application of other modulation method by detection of error rate per bit according to vary of channel error caused by electric equipment that is connected to power line was studied.

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저임피던스 통신 환경에서의 구동회로 개선에 관한 연구 (A Study on the Drive Circuit Improvement In the Low Impedance Communication)

  • 최태섭;임승하
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2006년도 하계종합학술대회
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    • pp.1001-1002
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    • 2006
  • As most of the powerline modems use spread spectrum modulation method which has strong immunity against the narrowband fading, or psk modulation method, the amplitude of the signal contains no useful informations. In this paper, we used class D amplifier to implement the drive circuit of the analog front end, and showed that it has great superiority over other existing drive circuits in rapidly impedance changing power line channel.

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