• Title/Summary/Keyword: Input/output Control

Search Result 2,504, Processing Time 0.032 seconds

Output Feedback Sliding Mode Control with High-gain Observer (고이득 관측기를 이용한 슬라이딩 모드 제어기 설계)

  • Oh, Seungrohk
    • Journal of the Institute of Electronics Engineers of Korea SC
    • /
    • v.40 no.1
    • /
    • pp.11-18
    • /
    • 2003
  • We consider a single-input-single-output nonlinear system which is represented in a normal form. The model contains the uncertainty. A high-gain observer is used to estimate the states variables to reject a modeling uncertainty We design the globally bounded output feedback controller using sliding mode control to stabilize the closed-loop system. The globally bounded output feedback controller reduce the peaking in the states variables. The proposed method give a more design freedom in the design of the globally bounded controller than that of the previous work.

Frequency Controlled Series Resonant Converter System for Power Supply of Communication Station (통신 기지국 전원용 주파수 제어 직렬 공진형 컨버터 시스템)

  • 지준근;임영하
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.4 no.4
    • /
    • pp.323-328
    • /
    • 2003
  • In this paper new control strategy of series resonant converter system for power supply of communication station is suggested. Frequency controlled series resonant converter system is robust to load variations because it is POSR(Parallel Output Series Resonant: POSR) type. And it provides stable output voltage by changing switching frequency to input voltage variations. Firstly, operation analysis about suggested series resonant converter system was carried. Then simulations using ACSL(Advanced Continuous Simulation Langage) and experiments to actual system were carried to prove characteristics of suggested system.

  • PDF

Soft-Switching Auxiliary Current Control for Improving Load Transient Response of Buck Converter

  • Kim, Doogwook;Shin, Joonho;Shin, Jong-Won
    • Proceedings of the KIPE Conference
    • /
    • 2020.08a
    • /
    • pp.160-162
    • /
    • 2020
  • A control technique for the auxiliary buck/boost converter is proposed herein to improve the load transient response of the buck converter. The proposed technique improves the system efficiency by enabling the soft switching operation of the auxiliary converter. The design guidelines for achieving capacitor charge balance for the output capacitor during the transient are also presented herein. The experimental results revealed that the output voltage undershoot and settling time during the load step-up transient were 40 mV and 14 ㎲, respectively, and the output voltage overshoot and settling time during the load step-down transient were 35 mV and 21 ㎲, respectively. The performance and effectiveness of the proposed technique were experimentally verified using a prototype buck converter with a 15-V input, 3.3-V output, and 200-kHz switching frequency.

  • PDF

Direct Learning Control For Linear Feedback Systems

  • Ahn, Hyun-Sik;Park, Ki-Hong;Heo, Seung-Jin
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 2003.10a
    • /
    • pp.96-100
    • /
    • 2003
  • In this paper, a DLC method is proposed for linear feedback systems to improve the tracking performance when the task of the system is repetitive. DLC can generate the desired control input directly from the previously learned control inputs corresponding to other output trajectories. It is assumed that all the desired output functions considered in this paper have some relations called proportionality and it is shown by mathematical analysis that DLC can be utilized to generate additional control efforts for the perfect tracking. To show the validity and tracking performance of the proposed method, some simulations are performed for the tracking control of a linear system with a PI controller.

  • PDF

Remote Fuzzy Logic Control System using SOAP (SOAP를 이용한 원격 퍼지 논리 제어시스템)

  • Yi, Kyoung-Woong;Choi, Han-Soo
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.13 no.4
    • /
    • pp.329-334
    • /
    • 2007
  • This paper deals with self-tuning of fuzzy control systems. The fuzzy logic controller(FLC) has parameters that an: input and output scaling factors to effect control output. Tuning method is proposed for the scaling factor. In this paper. it is studied to control and to monitor the remote system statues using SOAP for communicate between the server part and the client part. The remote control system is controlled by using a web browser or a application program. The server part is waiting for the request of client part that uses internet network for communication each other and then the request is reached. the server part saves client data to the database and send a command set to the client part and then the client part sends command to controller in a cool chamber. The administrator can control and monitor the remote system just using a web browser. The effects of membership functions, defuzzification methods and scaling factors are investigated in the FLC system.

Design of Fuzzy-Power Controller for a Pump with Electric Proportional Valve (절자 비례 밸브를 갖는 펌프의 퍼지-동력제어기 설계)

  • 전순용
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.4 no.4
    • /
    • pp.441-447
    • /
    • 1998
  • Motivated by a recent work, a fuzzy-power-controller(FPC) is designed for the relieving-horsepower control of output variable pump with electrical proportional valve and actually implemented on the industrial excavator. In order to calculate the output power of pump with input of FPC, a linear discrete time model of load system to pump is obtained and the result is applied to control the engine-pump coupled system by software without pressure and flow sensor. The FPC controls the engine and pump coupled system by relieving horsepower control according to the change of load and the running conditions in relieving horsepower control are selected by fuzzy inference engine. A case study is peformed through the construction of the control device and installation on the excavator. It shows that the relieving-horsepower control system with the FPC, as suggested in this paper, is superior to the conventional PID controllers. And also, the excavator, with the FPC, shows that the power-loss of the coupled system is reduced and the running speed of the hydraulic actuator is enhanced.

  • PDF

A Study of Control Algorithm for Propulsion System (열차 추진제어장치의 알고리즘에 관한 연구)

  • Choi, Jae-Ho;Kim, Hyung-Chul
    • Journal of the Korean Society for Railway
    • /
    • v.10 no.1 s.38
    • /
    • pp.51-56
    • /
    • 2007
  • In this paper, control schemes are developed for a propulsion system(Converter/Inverter) in electrical train. A robust controller for PWM converter is proposed. The converter controller consists of a PI controller for DC output voltage and a current controller using error-space approach for maintaining the sinusoidal current waveform and unity power factor. This proposed method is based on characteristic ratio assignment(CRA) method which has the advantage to design the optimal gain to meet the referenced response and overshoot within the limit range. Inverter system is controlled by vector control and slip frequency control. At low speed region, vector control scheme is applied to control instantaneous torque and slip frequency control is performed under overmodulation region and one pulse mode. Because output voltage of converter contains harmonics ripple at twice input ac line frequency, control scheme is developed to reduce the pulsating torque current. The performance of propulsion system will be verified by simulation and prototype experimental results.

Current Control of a Single-phase PWM Converter under the Distorted Source Voltage and Frequency Condition (전원 전압 왜곡과 주파수 변동 시 단상 PWM 컨버터의 전류 제어)

  • Ahn, Chang-Heon;Kim, Sang-Hoon
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.20 no.4
    • /
    • pp.356-362
    • /
    • 2015
  • This paper presents a current control strategy in the synchronous reference frame for a single-phase PWM converter, which ensures sinusoidal input current control under the distorted source voltage and frequency condition. Given that the distorted source voltage distorts the phase angle for PWM converter control, the input current contains the same harmonics as the source voltage. Aside from the distorted voltage, the variation in source frequency reduces the performance of input current control. To achieve sinusoidal input current control under the distorted source voltage and frequency condition, this paper proposes a compensation strategy of current reference with the distortion component extracted from the phase angle and a detection strategy of frequency variation from the output of a synchronous reference frame phase-lock loop. The experimental results confirm the validity of the proposed method under the distorted source voltage and frequency condition.

Development of Control Method for Event Recorder in High Speed Train (고속전철용 Event Recorder를 위한 제어 방식 개발)

  • Song, Gyu-Youn;Yim, Hyun-Jae;Chang, Tae-Wook
    • Proceedings of the KSR Conference
    • /
    • 2011.05a
    • /
    • pp.1182-1188
    • /
    • 2011
  • By storing various train information in running high speed train, we can analyze the cause of train accident efficiently. we have developed the smart and high available control method to control and manage the hardware modules. The hardware modules for event recorder consist CPU, Digital Input and Output, Pulse Input, Communication, Control Panel and Crash Protected Memory. The real time operation system is used to totally control and manage the various hardware modules. The main function of control method is collection of train information, calculation of train speed, interface with other on-board control system, storing and retrieving train information, and communication with Control Panel. In Control Panel, it displays the current train speed and the status of event recorder effectively. Also user interface is provided in Control Panel.

  • PDF

Output feedback $H^{\infty}$ contol for linear systems with delayed state and control input (상태와 제어입력에 시간지연을 가지는 선형 시스템의 출력궤환 H^\infty 제어)

  • 정은태;권성하;박홍배
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1997.10a
    • /
    • pp.688-691
    • /
    • 1997
  • This paper presents an $H^{\infty}$ controller design method for linear time-invariant systems with delayed state and control. Using the second method of Lyapunov, the stability for delayed systems is discussed. For delayed systems, we derive a sufficient condition of the bounded real lemma(BRL) which is similar to BRL for nondelayed systems. And the sufficient conditions for the existence of an output feedback $H^{\infty}$ controller of any order are given in terms of three linear matrix inequalities(LMls). Futhermore, we briefly explain how to construct such controllers from the positive definite solutions of their LMIs and give a simple example to illustrate the validity of the proposed design procedure.e.

  • PDF