• Title/Summary/Keyword: Sinusoidal input

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A Choppingless Converter for an SRM with UPF and Sinusoidal Input Current (UPF 및 정현파 입력 특성을 가지는 새로운 SRM 구동용 converter)

  • Rim, Geun-Hie;Kim, Won-Ho;Kim, Eun-Soo
    • Proceedings of the KIEE Conference
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    • 1993.11a
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    • pp.160-162
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    • 1993
  • This paper proposes a new converter for switched reluctance motors using a Boost converter in conjunction with a Buck converter. The proposed converter has a unity power factor(hereafter referred to an UPF) in the ac input regardless of the load variations. Moreover, compared to the conventional converter topologies, the total system efficiency is improved by introducing choppingless voltage control methods in the machine side converter and an energy recovery snubber in the pre-voltage regulation stage, respectively.

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A Simple Continuous Conduction Mode PWM Controller for Boost Power Factor Correction Converter

  • Tanitteerapan, Tanes;Mori, Shinsaku
    • Proceedings of the IEEK Conference
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    • 2002.07b
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    • pp.1030-1033
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    • 2002
  • This paper, a new simple controller operates in continuous conduction mode (CCM) for Boost power factor collection converter is introduced. The duty ratios are obtained by comparisons of a sensed signal from inductor current and a negative ramp carrier waveform in each switching period. By using the proposed controller, input voltage sensing, error amplifier in the current feedback loop, and analog multiplier/divider are not required, then, the control circuit implementation is very simple. To verify the proposed controller, the circuit simulation for Boost power factor correction converter was applied. For the results, the input current waveform was shaped to be closely sinusoidal, implying low THD.

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Convergence Characteristics of the Frequency Response Functions of Non-Linear Systems Expressed in Terms of the Volterra Series (Volterra급수로 나타낸 비선형시스템 주파수응답함수의 수렴특성)

  • ;Tomlinson, G. R.
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.8
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    • pp.1901-1906
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    • 1995
  • The frequency response functions of systems incorporating a non-linear cubic stiffness subject to sinusoidal excitation are derived using the Volterra series and the convergence characteristics investigated. It is shown that the series representation of the frequency response functions converges only when the sinewave input amplitude is within a certain range. Within the range of convergence the frequency response function based on the Volterra series approaches the analytical one as more higher order frequency response function terms are included. Proposed is a criterion for the studies systems to predict approximately the range of sinewave input amplitude for which the series representation of the frequency response functions converges.

Bistable tuned mass damper for suppressing the vortex induced vibrations in suspension bridges

  • Farhangdoust, Saman;Eghbali, Pejman;Younesian, Davood
    • Earthquakes and Structures
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    • v.18 no.3
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    • pp.313-320
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    • 2020
  • The usage of conventional tuned mass damper (TMD) was proved as an effective method for passive mitigating vortex-induced vibration (VIV) of a bridge deck. Although a variety of linear TMD systems have been so far utilized for vibration control of suspension bridges, a sensitive TMD mechanism to wind spectrum frequency is lacking. Here, we introduce a bistable tuned mass damper (BTMD) mechanism which has an exceptional sensitivity to a broadband input of vortex shedding velocity for suppressing VIV in suspension bridge deck. By use of the Monte Carlo simulation, performance of the nonlinear BTMD is shown to be more efficient than the conventional linear TMD under two different wind load excitations of harmonic (sinusoidal) and broadband input of vortex shedding. Consequently, an appropriate algorithm is proposed to optimize the design parameters of the nonlinear BTMD for Kap Shui Mun Bridge, and then the BTMD system is localized for the interior deck of the suspension bridge.

A Nonlinear Adaptive Prefilter for the Compensation of Distortion in a Nonlinear Systems (비선형 시스템의 왜곡 보상을 위한 비선형 적응 프리필터)

  • 임용훈;조용수;윤대희;차일환
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.32B no.7
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    • pp.1003-1009
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    • 1995
  • In This Paper, Linearization problem is discussed to reduce distortion of a nonlinear system based on Schetzen's pth-orfer inverse theorem. We propose a nonlinear adaptive prefiltering algorithm which can reduse nonlinear distortion up to pth order by tandemly connecting a pth-order Volterra filter before the nonlinear system under the consideration and by adjusting the filter coefficients adaptively. The feasibility of applying the proposed algorithm to a nonlinear system is conformed via computer simulation by observing significant reduction of total nonlinear distortion for the case of random input and sinusoidal input excitation.

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Electronic Ballast for Metal Halide Lamp with Free Voltage Input (프리볼트용 메탈할라이드램프 전자식 안정기)

  • Kwon Won-Mog;Chi Yun-Keun;Kim Nam-Jun
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.241-244
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    • 2002
  • This paper presents the electronic ballast for the metal halide lamp with free voltage input and implemented for CDM-T[150W] lamp. HID lamps have a good color rendition, long life and good focusing capability but they have fickers by acoustic resonance when driven at high frequency. To reduce the acoustic resonance phenomena, the electronic ballast was designed for high frequency operation with the constant frequency sinusoidal wave of 75[kHz]. Finally, the experimental results on the ballast of CDM-T [150W]metal halide lamp with the propose methods are discussed.

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A New Unity Power Factor Rectifier System using an Active Waveshaping Technique

  • Choi, Se-Wan;Bae, Young-Sang
    • Journal of Power Electronics
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    • v.9 no.2
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    • pp.173-179
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    • 2009
  • This paper proposes a new three-phase diode rectifier system with a sinusoidal input current at unity power factor and a regulated and isolated output voltage at low level. The inherent natural wave-shaping capability of the reduced kVA polyphase transformer together with an active current wave-shaping technique results in a significant reduction of input and output filter requirements associated with switching ripple and EMI. The operation principles are described along with a design example and a comparative evaluation. Experimental results on a 1.5kW prototype are provided to validate the proposed concept.

Practical Series-Parallel Compensated Uninterruptible Power Supply (실용적인 직병렬 구조의 무정전전원장치)

  • Jeon, Seong-Jeup;Choe, Gyu-Hyeong
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.6
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    • pp.322-329
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    • 1999
  • In this paper a practical series-parallel compensated UPS is suggested, which has high input power factor and sinusoidal output voltage regulation capability. Compared to conventional cascaded UPS, the size can be reduced significantly with high quality input and output waveforms. The front converter and the main inverter can be considered decoupled, hence the front converter and the main inverter can be designed independent of each other. In this paper, analysis and experimental results for an l KVA prototype are presented.

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Nonlinear Sliding Mode Control of an Axial Electromagnetic Levitation System by Attractive Force (흡인력을 이용한 자기 부상계의 비선형 슬라이딩 모드 제어)

  • 이강원;고유석;송창섭
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.10
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    • pp.165-171
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    • 1998
  • An axial electromagnetic levitation system using attractive force is a highly nonlinear system due to the nonlinearity of materials, variable air gap and flux density. To control the levitating system with large air gap, a conventional PID control based on the linear model is not satisfactory to obtain the desired performance and the position tracking control of the sinusoidal motion by simulation results. Thus, sliding mode control(SMC) based on the input-output linearization is suggested and evaluated by simulation and experimental approaches. Usefulness of the SMC to this system is conformed experimentally. If the expected variation of added mass can be included in the gain conditions and the model, the position control performance of the electromagnetic levitation system with large air gap will be improved with robustness.

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A Controller Design for SIV with Converter Derived Input Voltage for Consideration Economic Efficiency (경제성을 고려한 보조전원장치의 컨버터 입력전압 추정을 위한 제어기 설계)

  • Kim, Jae-Moon;Ahn, Jeong-Joon
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.1131-1136
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    • 2008
  • The single-phase PWM converter employing power semiconductors is currently applied to the power unit of high-speed rail vehicle and increasingly used as the front-end converter with properties of near unity power factor. Power factor and harmonics are increasingly important needs for drive system of high-speed rail vehicle. The proposed approach has many advantages which include fewer semiconductor components, simplified control, high performance features and satisfies IEC 555 harmonic current standards. Simulation results show that the dc-link voltage control obey the reference value during constant load and input current is near sinusoidal.

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