• Journal of Institute of Control, Robotics and Systems
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• v.12 no.7
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• pp.637-643
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• 2006

Generally, the tracking performance of optical disk drive(ODD) system can be improved using a disturbance observer(DOB). However, a DOB is not easily applied in an ODD system because an additional microprocessor, such as a digital signal processor(DSP), is needed. This paper shows how a DOB system can be replaced by the error-based modified disturbance observer(EM-DOB) when two mathematical conditions are satisfied. Due to the simplified structure of EM-DOB, the algorithm is easily implemented as an analog circuit, which is suitable for the ODD servo system. Additionally, in these algorithms, disturbances rejection performances can be tuned as Q filter parameters. Similar to a DOB system, three design guidelines of a Q filter can be applied. Experimental results of DOB and EM-DOB are evaluated under forced disturbances.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1995.04a
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• pp.171-177
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• 1995

환경 보호와 연비 향상을 목표로 한 고출력 엔진과 초경량 차체의 차량을 설계하려는 최근의 차량 개발 추세는 진동과 소음의 문제를 더욱 악화시키느 요인이 되었다. 이에 반해 차량을 구입하는 고객은 보다 정숙한 주행 성능을 요구하고 있다. 이런 상황에서 커다란 설계의 변경이나 차체의 중량 증가없이도 ㅈ거용가능한 능동 제어 기술(Active Control Technique)은 차량의 진동, 소음문제에서 훌륭한 해결책의 하나로 등장하였다. 최근까지 능동 소음제어와 관련한 연구는 여러 분야에서 수행되었으며, 실제로 시작차량뿐만 아니라 양산차에 적용된 사례가 있다. P.A.Nelson등은 음향 공동내의 음향 에너지를 최소화시키는 소음 제어에 관한 이론, 컴퓨터 시뮬레이션 및 실험에 대하여 발표하였다. 또한 최근의 디지탈 신호 처리기(DSP, Digital Signal Processor)의 개발에 힘입어 해석의 검즈외에도 실제 차량에 적용한 사례도 있다. 로터스(LOTUS,영)는 다양한 시작차를 제작하여 그 효과를 검증하였으며, 닛산(Nissan, 일)은 양산차에 적용하여 판매하고 있는 실정이다. 본 논문에서는 능동 소음 제어 장치를 개발하여 승용차에 적용한 결과를 보이도록 한다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.61 no.11
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• pp.1617-1624
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• 2012

A DC power system has many loads with varied functions. Also, there may be large pulsed loads with short duty ratios which can affect the normal operation of other loads. In this paper, Voltage Bus Conditioner(VBC) without any current sensors is proposed to damp the bus voltage transients by parallel pulsed loads. The proposed control approach requires only one voltage sensor and carries out both the functions of damping the bus voltage transients and maintaining the level of energy stored. The proposed control technique has been implemented on a TMS320F2812 Digital Signal Processor(DSP). Simulated results by a Matlab Simulink and experimental results are presented which verify the control principles and demonstrate the practicalty of the approach.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.978-979
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• 2008

본 논문에서는 TMS320F2812를 이용하여 연료 전지 BOP(Balance of Plant) 내장 터보 블로어로 쓰이는 영구자석 동기전동기의 센서리스 공간 벡터 제어를 구현하였다. 고속으로 회전하는 회전자의 위치 및 속도는 측정하기가 어려우므로, 전류를 이용하여 위상 및 속도를 추정하였으며, 이 알고리즘을 Digital Signal Processor(DSP) 상에서 구현하였다. 전류 측정시 노이즈에 의한 영향을 최소화하기 위해 외부에 12bit급 AD컨버터인 AD7891을 장착하였다. 데드타임 보상 및 dc-link 전압 리플 보상을 적용하였고, 정격 속도 100,000rpm에서 영구자석 동기전동기를 구동하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.527-528
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• 2015

최근 다양한 디지털기기에 따른 DC 부하의 증가와 함께 기존 배전망과 연계하여 운용할 수 있는 AC 그리드와 태양광과 연료전지 같은 DC 전원에 직접적으로 연계하여 운용하는 DC 그리드를 통합하는 AC/DC 마이크로그리드에 대한 연구가 진행되고 있다. 본 논문에서는 AC 그리드와 DC 그리드를 연계 제어하는 연계(interlinking) 컨버터의 제어기를 설계하고 성능을 검토하기 위해 TMS320F28335 DSP(Digital Signal Processor)와 실시간 디지털 시뮬레이터인 eMEGAsim으로 구성된 HILS(Hardware-in-the-Loop Simulation) 시스템을 구축하고 설계된 제어기의 성능을 테스트하였다.

• Journal of Mechanical Science and Technology
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• v.15 no.3
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• pp.339-350
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• 2001

To overcome problems in tracking error related to the unmodeled dynamics in the high speed operation of industrial robots, many researchers have used sliding mode control, which is robust against parameter variations and payload changes. However, these algorithms cannot reduce the inherent chattering which is caused by excessive switching inputs around the sliding surface. This study proposes a fuzzy-sliding mode control algorithm to reduce the chattering of the sliding mode control by fuzzy rules within a pre-determined dead zone. Trajectory tracking simulations and experiments show that chattering can be reduced prominently by the fuzzy-sliding mode control algorithm compared to a sliding mode control with two dead zones, and the proposed control algorithm is robust to changes in payload. The proposed control algorithm is implemented to the SCARA (selected compliance articulated robot assembly) robot using a DSP (digital signal processor) for high speed calculations.

• Proceedings of the KSME Conference
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• 2000.04a
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• pp.440-445
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• 2000

Robust tracking controller of optical disk drive(ODD) is designed using quantitative feedback theory(QFT). Nominal plant model is identified from real system through modal test. Uncertainties and control performance of tracking servo are specified, and robust controller satisfying these specifications is designed in the QFT framework. To verify the performances of designed controller, experiment are performed in a digital signal processor(DSP) environment, and experimental results are compared with simulations.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.05a
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• pp.465-468
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• 2001

An objection of this study is to develop a high stable analytic system of radioactive pulses. The proposed system consists of an amplifying circuit with 60dB gain, a programmable power supply unit which can generate DC voltage up to 1, 500V, and a digital signal processor. Pulse height distribution in accordance with pulse counts is important data in analyzing radioactive pulses. In this study, AD convertor (12bit, l00ns) and DSP (TMS 320C31-60) are used to analyze the pulse height, and the analytic system is designed to be operated in PC-networking.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.978-981
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• 1998

This paper presents a newly developed transformer-less single phase inverter for a photovoltaic (PV) power system. In the proposed system, there is no earth-leakage current at all in the theoretical base, and the main circuit of this system is rather simple and it is expected the higher efficiency will be realized. The system is operated by a digital signal processor (DSP) which makes it more flexible in the control. From the experimental results, it is found that this new inverter supplies the AC power to utility grid line with the power factor of nearly unity.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.580-583
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• 2002

An improved MPPT converter with current compensation method for small-scaled PV-applications is presented in this paper. The proposed method implements maximum power point tracking (MPPT) by variable reference current which is continuously changed during one sampling period. Therefore, the power transferred to the load is increased above $9\%$ by the proposed MPPT converter with current compensation method. As a result, the utilization efficiency of Photovoltaic (PV)-panel can be increased. In addition, as it doesn't use digital signal processor (DSP), this MPPT method has the merits of both a cost efficiency and a simple control circuit design. Therefore, it is considered that the proposed MPPT method is proper to low power, low cost PV-applications. The concept and control principles of the proposed MPPT method are explained in detail and its validity of the proposed method is verified through several simulated results.