• Title/Summary/Keyword: Gain saturation

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Gain Scheduled State Feedback and Disturbance Feedforward Control for Systems with Bounded Control Input - Application (제어입력 크기제한을 갖는 시스템에서 이득 스케줄 상태되먹임-외란앞먹임 제어 - 적용)

  • Kang, Min-Sig;Yoon, Woo-Hyun
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.12
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    • pp.65-73
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    • 2007
  • In this paper, the gain scheduled state feedback and disturbance feedforward control design proposed in the previous paper has been applied to a simple matching system and a turret stabilization system. In such systems, it is needed to attenuate disturbance response effectively as long as control input satisfies the given constraint on its magnitude. The scheduled control gains are derived in the framework of linear matrix inequality(LMI) optimization by means of the MatLab toolbox. Its effectiveness is verified along with the simulation results compared with the conventional optimum constant gain control and the scheduled state feedback control cases.

Implementation of the High Performance Unified PID Position Controller for Linear Motor Drive with Easy Gain Ajustment Part II - Gain Adjustment & Application (이득 설계가 간단한 선형전동기 구동용 고성능 통합 PID 위치제어기 구현 제2부: 이득설계 및 응용)

  • Kim, Jun-Seok
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.4
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    • pp.195-202
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    • 2002
  • The high performance position controller named 'Unified PID Position Controller'is presented in part 1 of this paper. In part 2, we provide smart gain adjustment methods including the freedom utilizations for rare sensitivity toward the system parameter variation and for increasing the stiffness of the system. Owing to the provided gain tuning strategy, the overall system characteristics can be stabilized without over-shoot phenomena when the system parameter is changed in the rate of from 0.5 to 2∼4. Moreover, for the actual feasibility to the industrial fields, a simple butt effective anti-windup strategy prohibiting the integral component of the PID position controller from saturation is presented too. All of the presented algorithms are verified through the experiment works with commercial linear motor.

Gain and spectra stabilization in erbium-doped fiber amplifier with optical feedback (광 귀환에 의한 erbium 첨가 광섬유 증폭기의 이득과 ASE 스펙트럼 안정화)

  • 김호삼;박희갑
    • Korean Journal of Optics and Photonics
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    • v.5 no.2
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    • pp.291-297
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    • 1994
  • A feedback loop with bandpass filter is introduced in erbium-doped fiber amplifier to clamp the amplifier gain by lasing the amplifier at a selected wavelength. The gain and the ASE (amplified spontaneous emission) output spectra are found to be independent of input signal power and pump power variation so long as the amplifier is lasing. Also they are found to be dependent only on the overall loss of the feedback loop. Even in the case of slowly modulated large signal input, signal distortion due to gain saturation is not observed.served.

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A Study on Wideband Parabolic Gain Equalizer Design for High Power Transmitter (고출력 배열 송신기용 광대역 타원형 이득 등화기 설계에 관한 연구)

  • Kim, In-Seon;Lee, Young-Joong;Park, Joo-Rae
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.3
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    • pp.378-387
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    • 2010
  • In this paper, we present new structure of wideband parabolic gain equalizer for TWT applied to printed circuit board. The gain equalizer is manufactured by using design variables of transmission line obtained from derived formulae. We compared the test results of two equalizers(reference equalizer and our equalizer). From that, we confirmed the validity of presented method. The presented equalizer is 1/3 times lighter, 1/2.7 times smaller and 1/10 times chipper than those of reference equalizer(Inmet company), respectively.

A compensation method for a temperature-dependent gain tilt in L-band EDFA using a voltage-controlled attenuator (L-band EDFA 에서의 온도에 따른 이득 변화와 가변 감쇄기를 이용한 온도 보상)

  • 이원경;정희상;주무정
    • Korean Journal of Optics and Photonics
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    • v.14 no.1
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    • pp.12-16
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    • 2003
  • This paper presents a compensation method for a temperature-dependent gain tilt in L-band erbium-doped fiber amplifier using a voltage-controlled attenuator. The gain tilts in the L-band of 1570-1605 nm due to a temperature change have negative slopes, whereas they have positive slopes for the increasing optical input powers in a saturation region. The proposed method utilizes these opposite gain variations to compensate for the gain tilt over a wide range of temperature. While applying forty channels with a channel spacing of 100 GHz in the L-band and changing the ambient temperature from 0 to $50^{\circ}C$, the compensation method maintained the gain deviation within 1 dB.

An Anti-Windup Compensation for Systems with Saturation Actuators (포화 요소가 있는 계를 위한 와인드업 방지 보상 방법)

  • 장원욱;박영진
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.7
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    • pp.1332-1340
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    • 1992
  • A novel approach based on a nonlinear compensator is prposed to prevent 'windup', which is caused by the saturation of the acutator and the integral action of the controller. The anti-windup compensator is located between the conventional linear controller, designed neglecting the saturation, and the actuator. It was proven based on the describing function method that, if the closed loop control systems are stable assuming no saturation, then there may exist a range of compensator gain which prevents any limit-cycle. The computer simulation results show that the compensator proposed in the manuscript can eliminate the limit cycle and improve the transient response.

The Characteristics of Transient Response vs. Lasing Wavelengths and Directions in Gain-Clamped L-band EDFA (고정이득 L-band EDFA에서 발진 파장 및 방향에 따른 과도응답 특성)

  • Kim Ik sang;Kim Chang bong;Yang Heng;Sohn Young ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.3A
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    • pp.160-167
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    • 2005
  • The gain-clamped EDFA has been developed to eliminate the output power change of WDM surviving channels to occur with added or dropped channels, which degrades the performance of WDM optical network. It maintains the constant gain of surviving channels when WDM channels are added or dropped in a network amplifying node. In this paper, the hi-directionally pumped gain-clamped EDFA is implemented to compensate the change of the input power by a lasing. The results show that the lasing of a short wavelength and backward propagation is the optimal condition to minimize the transient response of surviving channels in terms of the overshoot and gain saturation due to the inhomogeneous broadening effect.

Pump Effect by Injected C-band laser in L-band EDFA (L-band EDFA에서 주입된 C-band laser에 의한 펌프 효과)

  • 김익상;김동욱;김창봉
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.5A
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    • pp.484-491
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    • 2004
  • C-band pumping effect appears in L-band EDFA because the absorption in C-band occurs dominant under the condition of such a low average population inversion. In this paper, we show how the C-band pumping effect depends on 980nm pump power, the C-band wavelength, and its input power. The C-band pumping is caused by absorbing C-band injection or backward spontaneous emission power through EDF. If the same small signal condition is given by a C-band pump, the C-band pump of a long wavelength is good for the saturation and noise characteristics of L-band signal. Finally, it is considered that in the aspect of saturation characteristics, C-band compensation is not so much efficient as L-band in Gain-Clamped L-band EDFA having a lossy resonator.

연속 파장 가변시 현상론적인 비 선형 이득 포화 효과가 다전극 DBR 레이저의 변조 특성에 미치는 영향

  • Lee, S.;Park, N.;Park, H. L.;Choi, W. J.;Han, I. K.;Lee, J. I.;Kang, K. N.
    • Korean Journal of Optics and Photonics
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    • v.4 no.3
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    • pp.301-308
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    • 1993
  • Phenomenological nonlinear gain saturation effect on the modulation characteristics in a multi-electrode DBR laser, when the lasing wavelength changes, continuously is analized theoretically. FM efficiency, 3 dB bandwidth, and resonance frequency decrease with increasing bias current to the passive section, except increasing the flat FM response. It is found that the nonlinear gain saturation effect severely affects the modulation characteristics such as FM/IM response, 3 dB bandwidth, resonance frequency and CPR, but hardly affects the behavior of continuous frequency tuning.

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