• Title/Summary/Keyword: Sinusoidal input

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The Current Control with Multi-level Converter on Transformer type (변압기 방식 멀티레벨 컨버터의 전류제어)

  • Kim C. S.;Kwak D. G.;Chun J. H.;Suh K. Y.;Lee H. W.
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.215-218
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    • 2001
  • This paper is proposed a sinusoidal input current multi-level ac-dc converter using transformer. The multi-level converter which controls input current by combining Buck converter to Improve input current characteristics. This method, which is multiplying and duplicating output of converter of equal capacity, is able to control unit power factor of input current, reduce the problem caused by high frequency switching, and apply to high power converter because filter is not necessary The feasibility of the circuit is verified by computer simulation using PSIM

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The Development of a Programmable Single-Phase AC Power Source with a Linear Power Amplifier

  • Jeon, Jeong-Chay;Jeon, Hyun-Jae;Yoo, Jae-Geun;Son, Jae-Hyun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.9
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    • pp.39-46
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    • 2007
  • This paper presents a programmable single-phase ac power source that provides a sinusoidal output voltage with an adjustable output amplitude and frequency over a wide range as well as an arbitrary waveform. The ac power source under consideration have a linear power amplifier. The desired output values can be programmed with a personal computer. The power source operates at 220[V]/60[Hz] mains and the output voltage is isolated from the input circuit. The system consists mainly of a power converter to generate and amplify the waveform signal, a controller to control the desired output signal and measure the output parameters, and a control program to set the desired output and display the values. The prototype ac power source was constructed and tested with the results demonstrating a good performance.

Iron Loss Analysis Considering Excitation Conditions Under Alternating Magnetic Fields

  • Hong, Sun-Ki;Koh, Chang-Seop
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.3
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    • pp.33-38
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    • 2010
  • In this paper, the nature of iron loss in electrical steel during alternating field excitation is investigated more precisely. The exact definition of AC iron loss is cleared by accurately measuring the iron loss for conditions of both the sinusoidal magnetic field and sinusoidal magnetic flux density. The results of this approach to iron loss calculations in electrical steel are compared to experimentally-measured losses. In addition, an inverse hysteresis model considering eddy current loss was developed to analyze the iron loss when the input is the voltage source. With this model, the inrush current in the inductor or transformer as well as the iron loss can be calculated.

Design of a Variable Structure Controller having Chattering Alleviation Characteristics for the Speed Control of Sinusoidal type Brushless DC Motor (정현파형 브러시리스 직류전동기의 속도 제어를 위한 채터링 저감 특성을 갖는 가변구조 제어기 설계)

  • 김세일;최중경;박승엽
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.805-808
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    • 1999
  • In this paper, a chattering alleviation ISM speed controller for the sinusoidal type BIDC motor is designed. Dead Zone function is proposed to change the chattering occurring in the transient state form high frequency to low frequency and time-varying gains are applied for the control input to eliminate the steady state excessive chattering in the conventional ISM. The proposed Dead Zone function represents the sliding layer composed of two switching surfaces and if a state vector exists in this layer, the chattering don’t occur. Simulation and experimental results confirm the useful effects of the above algorithm.

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Performance Analysis on the Initial Alignment of Laser Inertial Navigation System (레이저 관성항법장치 초기정렬 성능 분석)

  • Kim, Hyun-Seok;Kim, Cheon-Joong;Lee, Tae-Gyoo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.12 no.5
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    • pp.622-635
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    • 2009
  • Laser Inertial Navigation System(LINS) consists of Ring Laser Gyroscopes(RLG) and accelerometers. RLG has a lock-in region in which there is zero output for input angular rates less than about 0.1deg/sec. The lock-in region is generated by the imperfect mirrors in RLG. To avoid the lock-in region, a sinusoidal motion called dither motion is applied on RLG. Therefore this dither motion is measured by RLG/accelerometer even if at a stop state. In this situation, the performance on the initial alignment of LINS can be degraded. In this paper, we analyze the performance on the initial alignment of LINS theoretically and experimentally. Analysis results include how dither motion, the pre-filter and the corner frequency in alignment loop affects the performance on the initial alignment of LINS.

Analysis of Induction Watthour Meter Characteristics (유도형 적산전력량계의 특성해석)

  • Jang, S.M.;Lee, S.H.;Jeong, S.S.;Park, Y.T.
    • Proceedings of the KIEE Conference
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    • 1997.07a
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    • pp.77-79
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    • 1997
  • An induction watthour meter was designed for use on circuits in which the voltage and current are essentially sinusoidal. As the application of switching devices has been increased, the waveforms of voltage and current have involved the harmonics. Therefore, power energy involving voltage and current with the harmonics is supplied to the system and the registration error of watthour meter is existed. In this paper, we experimented on the error of watthour mesurement under the sinusoidal and nonsinusoidal input source.

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An Analytical Approximation for the Pull-Out Frequency of a PLL Employing a Sinusoidal Phase Detector

  • Huque, Abu-Sayeed;Stensby, John
    • ETRI Journal
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    • v.35 no.2
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    • pp.218-225
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    • 2013
  • The pull-out frequency of a second-order phase lock loop (PLL) is an important parameter that quantifies the loop's ability to stay frequency locked under abrupt changes in the reference input frequency. In most cases, this must be determined numerically or approximated using asymptotic techniques, both of which require special knowledge, skills, and tools. An approximating formula is derived analytically for computing the pull-out frequency for a second-order Type II PLL that employs a sinusoidal characteristic phase detector. The pull-out frequency of such PLLs can be easily approximated to satisfactory accuracy with this formula using a modern scientific calculator.

A Study on Ultra Precise Position Control of Servomotor using Analog Quadrature Encoder (정현파 엔코더를 이용한 서보전동기 초정밀 위치 제어에 관한 연구)

  • Kim, Ji-Chan;Kim, Jang-Mok;Kim, Cheul-U;Choi, Cheol;Cho, Han-Ik
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.237-239
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    • 2005
  • This paper describes the ultra precise position estimation of a servomotor using sinusoidal encoder based on Arcsine Interpolation Method. The amplitude and offset errors of the sinusoidal encoder output signals are effectively compensated and on-line tuned by utilizing a low cost programmable differential amp without any special expensive equipments. To theoretically evaluate the practical resolution of this system, the relationship between the amplitude of A/D converter input signal errors and the anticipated resolution is briefly dealt with. The performance of the proposed method is verified by the experiments, by comparing it with position and speed control characteristics of the servomotor driving system using a digital incremental 50,000ppr encoder.

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Analysis of nonlinear control systems with various diher signals (비선형제어계에 사용하는 제선형화신호의 해석)

  • 이상혁
    • 전기의세계
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    • v.13 no.2
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    • pp.5-10
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    • 1964
  • Some nonlinearities in feedback control systems, such as relay servo, Coulomb friction, saturating amplifier of backlash in gears cause some undesirable effects. These may be static errors, limit cycles or jump phenomena. So, linearizing method of these nonlinearities using dither signals was first suggested by Loeb. He pointed out that the addition of high frequency signal to either the input or the output of a nonlinear system would make the nonlinear performance approximate the performance of linear systems. He used high-frequency sinusoidal wave as dither signal. But, in this thesis, general method of analysis is suggested for nonlinear control systmes using various dither signals, such as noise signal of Gaussian amplitude distribution, sinusoidal dither signal and sawtooth dither signal. Also, the advantage and disadvantage of these dither signals are compared. Throughout the analysis statistical method is adopted and lastly analog computer is used for the experiment of various nonlinear systems using dither signals.

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Modeling of four-times voltage PWM power conversion equipment (4배전압 PWM 전력변환장치의 모델링)

  • Jung S. W.;Kang W. J.;Kwon S. K.;Suh K. Y.;Lee H. W.
    • Proceedings of the KIPE Conference
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    • 2002.11a
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    • pp.137-139
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    • 2002
  • This paper proposes a four times DC-link voltage PWM power converter, which is constructed by four cascade connected power switching devices. such as IGBT. These four switching devices are controlled by a sinusoidal PWM method to obtain a DC-link voltage. which is higher than 4 times the peak supply voltage, and to suppress input current harmonic components. achieving a sinusoidal current waveform with less than $3[\%]$ distortion. Which is also constructed by four cascade connected IGBT. by the simulation result.

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