• Title/Summary/Keyword: Micro-controller

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Power Factor Correction of Switched Reluctance Motor Drive System using Boost Converter (승압형 컨버터를 이용한 SRM의 구동시스템 역률개선)

  • Yoon Yong-Ho;Kim Jae-Moon;Lee Tae-Won;Kim Hack-Seong;Won Chung-Yuen
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.3
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    • pp.211-218
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    • 2005
  • Switched Reluctance Motor(SRM) offers the advantages of simple and robust motor construction, high speed and high efficiency over a wide operating range of torque and speed, excellent controllability. However SRM has the disadvantages of high current harmonics, and low power factor because the required output of speed and torque is produced by the discontinuous and loss of power system, and brings about the incorrect operation of electronic system. This paper deals with an energy efficient converter fed SRM system with the reduced harmonics and improved power factor. The validity of the proposed scheme is verified via experiments. We are implemented the proposed control system using 80C196KC micro-controller.

A New Three-Phase Lead-Lag Random Pulse Position PWM Scheme for Decreasing Audible Acoustic Noise of Motor Drives (모터 구동 장치의 가청 소음 저감을 위한 새로운 3상 Lead-Lag 랜덤 펄스 위치 PWM 기법)

  • Wi, Seok-O;Jeong, Yeong-Guk;Im, Yeong-Cheol;Na, Seok-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.7
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    • pp.387-398
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    • 2002
  • In this paper, a new Three-Phase Lead-Lag Random Pulse Position PWM(LL-RPWM) scheme is proposed and implemented for decreasing audible acoustic noise of motor drives. In the proposed RPWM(Random PWM), each of three phase pulses is located randomly in each switching interval. Based on the space vector modulation technique, the duty ratio of the pulses is calculated. Along with the randomization of the PWM pulses, we can obtain the effects of spread spectra of voltage, current as in the case of randomly changed switching frequency. To verify the validity of the proposed LL-RPWM, the simulation and experimental study was tried. Along with the randomization PWM pulses, the space vector modulation is also executed in the C167 micro-controller. The simulation and experimental results show that the voltage and current harmonics are spread to a wide band area and that the audible acoustic noise is reduced by the proposed RPWM method.

Development of the Control System for the Motor-Driven Electromechanical Total Artificial Hearta

  • Kim, Hee-Chan;Lee, Sang-Hun;Kim, Jong-Won-;Kim, Jin-Tae-;Min, Byoung-Goo
    • 제어로봇시스템학회:학술대회논문집
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    • 1988.10b
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    • pp.858-863
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    • 1988
  • A micro-processor based control system for a brushless DC motor used in the motor-driven electromechanical total artificial heart was developed. Functionally, the control system is composed of two parts. The first part is the velocity and position controller to assure that the motor follows a predetermined optimal velocity profile with minimal energy consumption, and to guarantee the full stroke length. This part also utilize the passive adaptive control method to be robust against the load disturbance, system parameter variation, and uncertainty which is the environment of artificial heart system. The pump output control is the second part, and this part provides the required responses of the artificial heart to the time-varying physiologic demands. The basic requirements of these responses are preload sensitivity, afterload insensitivity, and the balanced ventricular outputs. The performance and reliability of this control system was evaluated through a series of mock circulation tests and animal implantation, and the results are very encouraging.

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Design and Performance Evaluation of a 3-DOF Mobile Microrobot for Micromanipulation

  • Park, Jungyul;Kim, Deok-Ho;Kim, Byungkyu;Kim, Taesung;Lee, Kyo-Il
    • Journal of Mechanical Science and Technology
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    • v.17 no.9
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    • pp.1268-1275
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    • 2003
  • In this paper, a compact 3-DOF mobile microrobot with sub-micron resolution is presented. It has many outstanding features : it is as small as a coin ; its precision is of sub-micrometer resolution on the plane ; it has an unlimited travel range ; and it has simple and compact mechanisms and structures which can be realized at low cost. With the impact actuating mechanism, this system enable both fast coarse motion and highly precise fine motion with a pulse wave input voltage controlled. The 1 -DOF impact actuating mechanism is modeled by taking into consideration the friction between the piezoelectric actuator and base. This modeling technique is extended to simulate the motion of the 3-DOF mobile robot. In addition, experiments are conducted to verify that the simulations accurately represent the real system. The modeling and simulation results will be used to design the model-based controller for the target system. The developed system can be used as a robotic positioning device in the micromanipulation system that determines the position of micro-sized components or particles in a small space, or assemble them in the meso-scale structure.

Development of Mobile Robot for Rough Terrain (야지 주행을 위한 견마형 로봇 개발)

  • Lee, Ji-Hong;Shim, Hyung-Won;Jo, Kyoung-Hwan;Hong, Ji-Mi;Kim, Jung-Bae;Kim, Sung-Hun
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.9
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    • pp.883-895
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    • 2007
  • In this work, we present the development of a patrol robot which is intended to navigate outdoor rough terrain. Proposed mechanism consists of six legs for overcoming an obstacle, and six wheels for traveling. Also, in order to absorb vibration in rough terrain effectively, the slide-spring system and tubed type tire are adopted to each leg and each wheel. The control system of robot consists of several imbedded boards for management of lots of diverse devices such as sensors designed for rough terrain, motor controllers, camera, micro controller and so on. And the base system of the robot is designed to operate in real time and to surveille in the vicinity of the robot, and the robot system is controlled by wireless LAN connected to GUI-based remote control system, while CAN communication connects the control board and the device controllers for sensors and motor controllers. For operating this robot system efficiently, we propose the control algorithms for autonomous navigation using GPS, stabilization maintenance by posture control, obstacle-avoidance by impedance control, and obstacle-overcoming with interference-avoidance between wheels. The performance of the robot and the proposed algorithms are tested and proved by a set of experiments in outdoor rough terrain.

A Single-Chip, Multichannel Combined R2MFC/DTMF/CCT Receiver Using Digital Signal Processor (DSP 칩을 이용한 다중채널 R2MFC/DTMF/CCT 겸용 수신기)

  • 김덕환;이형호;김대영
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.31B no.10
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    • pp.21-31
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    • 1994
  • This paper describes the multichannel combined R2MFC/DTMF/CCT reciver which provides a signaling service functions for call processing control in digital switching system. Using the TMS320C25 DSP chip, we have implemented multi-function receriver shich processes 8 channels of R2MFC, DTMF, and CCT signals simultaneously. In order to increase the channel multiplicity of the combined receiver. R2MFC and CCT receiver were employed by discrete Fourier transform(DFT) method using Goertzel algorithm, and DTMFreceiver was employ by infinite impulse reponse(IIR) filtering method using 4KHz subsampling technique. The combined receiver has 4 function modes for each channel such as R2MFC, DTMF, CCT, and Idle modes. The function mode of each channel may be selected at any time by single-chip micro-controller(.mu.C). Hence, the number of channels assigned for each function mode can be adjusted dynamically according to the signaling traffic variations. From the experimental test results using the test-bed, it has been proved that the combined receiver statisfies all receiver satisfies all receiver specifications, and provides good channel multiplicity and performance, Therefore, it may give a great improvement than existing receiver in cost, reliability, availability, and serviceability.

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A Study on the Performance of a Hybrid Daylighting System Using AVR Microcontrollers (AVR Microcontroller를 이용한 하이브리드 자연채광시스템의 성능에 관한 기초연구)

  • Lim, Sang Hoon;Oh, Seung Jin;Kim, Won-Sik;Jeong, Hae-Jun;Chun, Wongee
    • Journal of the Korean Solar Energy Society
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    • v.35 no.6
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    • pp.1-7
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    • 2015
  • This paper deals with the design and operation of a hybrid daylighting system that uses natural and artificial lighting to enhance visual comfort in buildings. The system was developed using an AVR micro controller for solar tracking in conjunction with dimming controls, which, acting together, enables the maximum use of natural daylight and also improves energy efficiency in buildings. Experimental results clearly demonstrates the usefulness of the present system capable of enhancing indoor lighting conditions when sufficient daylight is available and distributed appropriately in harmony with artificial lighting.

Adaptive Feedforward Rejection of Microactuator Resonance in Hard Disk Drive Dual-stage Actuator Servo (하드디스크 드라이브 마이크로 구동기의 공진 영향 제거를 위한 적응 피드포워드 제어)

  • Oh, Dong-Ho;Lee, Seung-Hi;Baek, Sang-Eun;Na, Hee-Seung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2000.06a
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    • pp.1596-1600
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    • 2000
  • We propose a novel adaptive feed forward controller (AFC) design method for rejecting the effect of micro actuator resonance in the design of dual-stage actuator servo systems for disk drives. Microactuator's resonance is one of important issues in dual-stage actuator servo, which varies up to ${\pm}10%$ per product and even during operation. We derive an adaptive algorithm for the proposed AFC design, which turns out to be identical to the delayed-x LMS algorithm which is a special form of the filtered-x LMS algorithm. In the algorithm, coefficients of the AFC are adapted by the residuals of constrained structure defined in such a way that the coefficients become time invariant. Contrary to the conventional AFC, it considers the phase delay of closed-loop transfer function at resonance frequency for system stability. We also apply an adaptive algorithm with frequency tracking capability. The frequency tracking algorithm is induced by the orthogonality of AFC coefficients. Computer simulations are carried out to demonstrate effect of the proposed AFCs.

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Remote Monitoring of Patients and Emergency Notification System for U-Healthcare

  • Lee, Jun;Jang, Hyun-Se;Yang, Tae-Kyu;Seo, Yong-Ho
    • International journal of advanced smart convergence
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    • v.2 no.1
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    • pp.1-5
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    • 2013
  • This study proposes a remote monitoring of patients and emergency notification system with a camera and pulse wave sensor for U-Healthcare. The proposed system is a server client model based U-Healthcare system which consists of wireless clients that have micro-controller, embedded-board for patient status monitoring and a remote management server. The remote management server observes the change of pulse wave data individually in real-time sent from the clients that is to be remote-monitored based on the pulse wave data stored by users and divides them into caution section and emergency section. When the pulse wave data of a user enters an emergency situation, the administrator can make a decision based on the real-time image information and pulse rate variability. When the status of the monitored patient enters the emergency section, the proposed U-healthcare system notifies the administrator and relevant institutions. An experiment was conducted to demonstrate the pulse wave recognition of the proposed system.

Development of CMS Function in LED BLU (LED BLU의 CMS 기능구현에 관한 연구)

  • Cheon, Woo-Young;Song, Sang-Bin;Kim, Ji-Hoon;Kim, Jin-Hong;Lee, Hyun-Chul
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1499-1500
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    • 2008
  • 최근에 LCD의 후면광원으로 LED를 채용하는 경우가 증가하고 있다. 이러한 LED를 Back Light으로 사용할 경우 일정한 휘도의 유지와 색좌표의 보정은 고급제품의 경우 채용이 증가하고 있다. 본 연구에서는 LCD Monitor용 LED BLU의 CMS(Color Management System)을 개발하기 위하여 1.5W R,G,G,,B가 하나의 PKG에 들어있는 LED를 이용하여 Direct type의 Back Light Unit을 개발하였다. 방열 및 휘도 균일도를 고려하여 LED part를 설계, 개발하였고 LED를 PWM으로 구동하기 위하여 Switching circuit이 포함되는 구동회로 부분을 설계, 개발 하였다. 또한 Color Sensor와 CMS IC를 사용하여 Color를 Control하고 휘도도 컨트롤하는 제어회로 부분도 개발을 하였다. CMS 기능의 제어회로 부분을 개발하기 위하여 MicroController를 사용하였으며 CMS IC와의 통신을 위한 부분도 개발하였다. 이러한 구성을 개발하여 시제품을 직접 제작하였다. 평가를 위하여 성능시험을 실시하였고 광학적인 평가도 시행하였다. 제작된 시제품은 L558 x W359 x H30 으로 하였다. 휘도는 목표휘도를 이루었으며 균일도는 85% 이상이 되었다.

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