• Title/Summary/Keyword: Modulation method

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

  • Oh, Duk-Jin;Kim, Hee-Jun;Oh, Won-Seok;Cho, Kyu-Min
    • Proceedings of the KIEE Conference
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    • 2002.07b
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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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A High Frequency Complex Modulation Method of the Electronic Ballast for Metal Halide Lamps (메탈 할라이드 램프용 전자식 안정기의 고주파 복합 변조법)

  • 오덕진;김희준;조규민
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.40 no.3
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    • pp.215-224
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    • 2003
  • This paper presents an electronic ballast using a novel complex modulation method for the metal halide lamp. The proposed modulation method, which has a modulating signal of swept complex 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 ate discussed.

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

  • Yoon Young-Doo;Sul Seung-Ki
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.6
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    • pp.543-549
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    • 2005
  • This paper presents a carrier-based modulation method for the control of a matrix converter. By using the offset voltage and changing the slope of the carrier, it is possible to synthesize sinusoidal input currents with unity power factor and the desired output voltages. The proposed method is equivalent to the so called SVPWM (Space Vector PWM) method, but its implementation is much easier. Moreover, the proposed method is very attractive because it is possible to apply the 2 phase t 3 phase modulation method, overmodulation method and other methods which are well-developed in the study of voltage source inverters (VSI) to the matrix coverter modulation. The feasibility of the proposed modulation method has been verified by computer simulation and experimental results.

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

  • Ryu, Taerim;Choi, Ui-Min
    • The Transactions of the Korean Institute of Power Electronics
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    • v.27 no.1
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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.

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

  • Lim, Hyun-Joo;Cha, Han-Ju
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.4
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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.

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

  • Lee, Byung-Soo;Bang, Chang-Joon;Kim, Hun Jin;Lim, Sang-Joon;Park, Jong-Hyuk
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.11a
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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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Study on The High Frequency Modulation Method for The Metal Halide Lamp Elec (메탈 할라이드 램프용 전자식 안정기의 고주파 변조 방식에 관한 연구)

  • Moon, Tae-Hwan;Oh, Duk-Jin;Kim, Hee-Jun;Cho, Kyu-Min
    • Proceedings of the KIEE Conference
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    • 2001.10a
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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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Frequency Modulation Method of ZVT Interleaved DC/DC Converter Using Auxiliary Coupled-Inductor (보조 커플드-인덕터를 이용한 ZVT 인터리브드 DC/DC 컨버터의 주파수 변조 기법)

  • Lee, Jong-Young;Lee, Soon-Ryung;Lee, Kang-Hyun;Won, Chung-Yuen;Yi, Je-Hyun;Cho, Bo-Hyung
    • Proceedings of the KIPE Conference
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    • 2016.11a
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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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Embodiment of the Power-Line Modem for high noise environment (내잡음성 저속 전력선 모뎀의 구현)

  • Yeo, Jin-Ki;Lee, Seung-Min;Lee, Heung-Ho
    • Proceedings of the KIEE Conference
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    • 2002.11c
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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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A Study on the Drive Circuit Improvement In the Low Impedance Communication (저임피던스 통신 환경에서의 구동회로 개선에 관한 연구)

  • Choi, Tae-Seop;Lim, Seung-Ha
    • Proceedings of the IEEK Conference
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    • 2006.06a
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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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