• Title/Summary/Keyword: Modulation method

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Vector Control of Induction Motors using 80C196MC (80C196MC를 이용한 유도전동기 벡터제어)

  • 이동명;김창현;이주환;김학원;홍석종;김종철;신휘범
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.156-160
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    • 1997
  • This paper proposed the vector controller of induction motors using one chip microprocessor. For developing a small and cheep speed control system, we use the one chip microprocessor 80C196MC. By using the one chip microprocessor we can make an inexpensive and small-sized vector controller for induction motors. We apply indirect vector control method and space vector modulation method to this system. The experimental results show that the proposed inverter has high performance features.

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The Current Type Semiconductor Reactive Power Compensator Using Delta Modulation Method (델터변조방식을 이용한 전류형 반도체 무효전력보상장치)

  • Baek, Hyung-Lae;Kim, Han-Sung
    • Proceedings of the KIEE Conference
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    • 1991.07a
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    • pp.443-446
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    • 1991
  • In the conventional current control methods for the current-type reactive power compensators, it is usual to compare the reactive reference current signal with the triangular wave and hence to generate the ON-OFF signals for the semiconductor reactive power compensator. To improve the response as well as the control capability, the delta modulated current control technique is proposed in this paper and studied theoretically.

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Electrodeless Lamp Converter of PID Control use Amplitude Modulation Method (진폭변조방식을 이용한 무전극 램프용 컨버터의 PID제어)

  • Kwon, Myung-Il;Jang, Do-Hyun
    • Proceedings of the KIPE Conference
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    • 2007.11a
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    • pp.206-208
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    • 2007
  • 무전극 램프의 조광 장치에서 필요한 컨버터의 필요조건은 입력 전압을 승 강압 문제뿐만 아니라 역률 보상 문제도 해결하기 위해서는 입력전류가 연속적인 방식만을 사용해야 한다는 제약 조건이 있다. 이 논문에서는 무전극 조광 장치에서 사용 되어 질 수 있는 컨버터의 구조와 시스템을 제어하기 위해 가장 일반적으로 사용되고 있는 PID제어기를 사용하여 조광함을 목적을 한다.

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Automatic Identification of Digital Modulation Methode Using an Artification Neural Network (신경망을 이용한 디지털 변조방식의 자동식별)

  • 신용조
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.10B
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    • pp.1769-1776
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    • 2000
  • In this paper a new method is proposed to identify a modulation method in the case of unknown digitally modulated input signals. The proposed identification method is implemented with an artificial neural network which is based on characteristic feature extracted from the instantaneous amplitude the instantaneous phase and the instantaneous frequency of the input signals. The proposed method was simulated with 9 type signals (ASK2, FSK2, FSK4, PSK2, PSK4, PSK8, QAM8, QAM16) in a noisy communication environment. The results show that the artificial neural network can accurately recognize all kinds of patterns.

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A Study on current sensor (전류 검출기에 대한 연구)

  • Lee, Hwan
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.3
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    • pp.335-340
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    • 1996
  • The item and structure of current detector depends on the current in conductors. The Hall current detector of these detectors is to use the variation of Hall voltage to conductor's current and it is very difficult for the conventional type to detect small current. In this paper we study experimented-method that detect AC current by using the magnetic modulation method the current, 0[mA]~100[mA]. The experiments results in 5 percent against the conventional, 20 percent in linear error, 0.12[.DELTA.mV/.DELTA.mA] to conventional type, 50[.DELTA.mV/.DELTA.mA] in sensitivity. (author). 7 refs., 15 figs.

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Realization of Space Vector PWM using Offset Voltage for PMLSM (영구자석 직선형 리니어 동기전동기의 오프셋 전압에 의한 공간벡터 PWM의 구현)

  • Jang Seok-Myeong;Park Ji-hoon;Jang Won-Bum;You Dae-Joon
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1088-1090
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    • 2004
  • This paper presents control pattern of air-cored slotless permanent magnet linear synchronous motor using voltage modulation method which is used space vector voltage modulation and offset voltage modulation.

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Clock Recovery Method for DWMT VDSL (DWMT VDSL을 위한 클럭 복원방식)

  • 문인수;정항근
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.81-85
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    • 1999
  • DWMT VDSL system needs A/D converter clock, bit clock, symbol clock, frame clock, etc. DMT ADSL system utilizes a correlation method which makes use of cyclic prefix or preamble pattern for clock recovery. But the correlation method is difficult to apply to the DWMT system because modulated symbols are overlapped in the time domain. This paper proposes a novel clock recovery method which can be used for the DWMT system due to its inherent independence of the modulation method. This new method is verified by SPICE simulations.

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DPSK Modulation Method Analysis for UWB Communication System (UWB 통신 시스템을 위한 DPSK 변조방식 성능분석)

  • 김성근;윤상훈;정정화
    • Proceedings of the IEEK Conference
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    • 2003.07a
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    • pp.545-548
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    • 2003
  • 본 논문은 UWB 통신 시스템에서 DPSK를 적용한 다중비트 변조 알고리즘을 제안한다. UWB 통신 시스템은 매우 낮은 파워의 신호를 사용하므로, 한 펄스를 이용한 다중비트를 보낼 수 있는 변조 알고리즘이 중요한 부분으로 작용한다. 이 논문에서는 UWB 시스템에서Gaussian 펄스에 정현파 가 곱해진 두 개 펄스의 조합을 이용하여 FCC Mask 에 저촉되지 않으면서 한 펄스에 다중 비트를 전송을 실현한 M-ary 전송 방식을 사용한다. 또한 채널상에서 펄스의 원치 않는 위상변화에 민감하지 않도록 하기 위해 DPSK 방식을 적용한 UWB 제안한다. 제안된 알고리즘의 성능 평가를 위해 시뮬레이션 하였고 그 결과와 구조를 본 논문에 제시한다.

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ESTIMATION OF DEVICE CURRENT IN PWM INVERTERS

  • Ji, Ho-chul;Jeong, Seoung-Gi
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.506-511
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    • 1998
  • This paper gives and analytical expression of the average and rms currents of switching devices in volt-age-fed PWM inverters. It is shown that the device currents are represented by a function of the power factor of the load and the normalized output voltage of the inverter. The validity of the derived formulas is confirmed with simulation and experiment, showing that the modulation method has a minor effect on the characteristics of the device current.

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Development of Stroke Sensing Cylinder Using Magnetic Sensor and Its Performance Estimation (자기 센서를 이용한 스트로크 센싱 실린더의 개발 및 성능평가)

  • 홍영호;이민철;이만형;양순용;진영일
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.04b
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    • pp.278-282
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    • 1995
  • We developed a part of storke sensing cylinder using magnetic sensor and estimated is performance. In this paper, for the performance estimation of stroke sensing cylinder. We consist of hydrallic system using solenoid valve with ON/OFF motion. In order to the control of solenoid valve for the position control of cylinder rod, PWM (Pulse Width Modulation) method which modulates time pulse width in proportion to error was used. A performance of cylinder rod with magnetic scales was evaluated by its hydraulic system.

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