• 소음진동
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• 제9권1호
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• pp.33-41
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• 1999

This paper presents a method of actively controlling the interior noise by a trim panel with hybrid feedforward-feedback control loop. The control technique is designed to minimize the vibration of panel whose motion is limited to that of a piston (out-of-plane motion). The hybrid controller consists of an adaptive feedforward controller in conjunction with a linear quadratic Gaussian (LQG) feedback controller. In order to maintain control performance of both persistent and transient disturbances, the feedback loop speeds up the adaptation rate of feedforward controller by improving damping capacity of secondary plant related with the adaptation rule. Numerical simulation and experimental result indicate that the hybrid controller is a more effective method for reducing the vibration of the panel (and therefore the interior noise) compared to using feedforward controller.

• 한국컴퓨터정보학회논문지
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• 제12권4호
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• pp.249-256
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• 2007

본 논문에서는 휴대 가능한 중소형($4{\sim}9$인치 크기)의 정보단말기에 사용되는 TFT-LCD(Thin Film Transistor addressed -Liquid Crystal Display)의 LDI(LCD Driver Interface) 제어기(controller)를 제조사와 크기에 관계없이 사용할 수 있는 표준화된 범용 TFT-LCD의 LDI를 설계하고 FPGA(Field Programmable Gate Array)로 구현하였다. 설계한 LDI 제어기는 FPGA 테스트 보드(test board)에서 검증하였으며, 상업용 TFT-LCD 패널에서 시험결과 안정적으로 상호 동작하였다. 설계한 범용 LDI 제어기의 장점은 LCD의 제조사와 크기에 관계없이 그 동작을 표준화시켜 설계하였으므로 향후 모든 패널내의 SoG(System on a Glass) 모듈 설계에 적용할 수 있는 것이다. 그리고 기존의 방식에서는 LCD 제조사별, 패널 크기별로 별개의 LDI 제어기 칩을 개발하여 사용하지만, 설계한 LDI 제어기는 모든 휴대 가능한 중소형 패널을 구동시킬 수 있어서 IC의 공급가, AV 보드와 패널의 제조 원가 하락을 가져올 수 있으며 가까운 장래에는 보다 우수한 기능의 패널을 제작하기 위한 TFT-LCD 패널 모듈의 SoG 개발이 필연적으로 요구되고 있다. 연구결과는 TFT-LCD 패널을 더욱 소형화, 경량화 그리고 저가격화가 가능하여 기술 및 시장 경쟁력을 선점할 수 있다. 또한 향후 많은 수요가 예상되는 이동형 정보단말기에 사용되는 TFT-LCD 패널 모듈의 SoG IC(Integrated Circuit) 개발과 제작을 위한 기초 자료로서 활용될 수 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.347_348
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• 2009

In this paper, we described the integrated monitoring system for low-voltage panel boards. This system consists of three parts, a panel board controller, an integrated monitoring unit and a remote PC. The panel board controller which was made of CT/PT unit, control unit and power supply is able to transmit variable parameter for monitoring and diagnosis of low voltage branch circuits. Also, the integrated monitoring unit was collected monitoring data from panel boards and displayed on the touch panel.

• Journal of Power Electronics
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• 제14권6호
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• pp.1281-1292
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• 2014

Photovoltaic (PV) solar systems with series-connected module integrated converters (MICs) are receiving increased attention because of their ability to create high output voltage while performing local maximum power point tracking (MPPT) control for individual solar panels, which is a solution for partial shading effects in PV systems at panel level. To eliminate the partial shading effects in PV system more effectively, sub-MICs are utilized at the cell level or grouped cell level within a PV solar panel. This study presents the results of a series-output-connection MPPT (SOC-MPPT) controller for sub-MIC architecture using a single sensor at the output and a single digital MPPT controller (sub-MIC SOC-MPPT controller and architecture). The sub-MIC SOC-MPPT controller and architecture are investigated based on boost type sub-MICs. Experimental results under steady-state and transient conditions are presented to verify the performance of the controller and the effectiveness of the architecture.

• 한국전자통신학회논문지
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• 제15권2호
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• pp.267-272
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• 2020

현재 석유화학산업단지는 폭발성 가스와 가연성 가스로인하여 언제나 폭발 위험성이 상존하고 있다. 이러한 폭발을 방지하고자 제어기 및 제어기 패널을 포함한 모든 설비에 방폭을 요구하고 있다. 방폭용으로 현재 사용하고 있는 제어기 패널은 패널의 내부와 외부의 압력(양압)과 온도를 일정하게 유지를 위해 외부에서 수동으로 공기를 주입하는 방식을 사용하고 있다. 이에 본 논문은 자동으로 압력과 온도를 제어할 수 있는 방폭형 패널의 통합 제어기 설계를 제안한다.

• 전력전자학회논문지
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• 제25권2호
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• pp.118-126
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• 2020

A solar array simulator is a special power supply that regulates the output voltage and current to simulate the characteristics of a photovoltaic panel. The operating point of the panel is difficult to control with a single controller because of the non-linearity of the output curve, which is determined by the amount of irradiation, temperature, and panel material. In the conventional method, the output curve is divided into sections through the current and the voltage mode controls. It reduces the overall performance of the system due to the interchanging control mode. By using the single mode controller, the noise interference of the measured value and the stability of the control around the maximum power point were demonstrated. To solve these issues, this study proposes a new unified controller. The stability of the controller was analyzed along with operating principles, and performance improvement was experimentally verified.

• 전력전자학회논문지
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• 제23권1호
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• pp.47-58
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• 2018

A solar array simulator (SAS) consists of an engine that generates a setpoint according to panel characteristics, a power stage that provides the actual output, and a controller. Particularly, if the control method is not suitable due to the nonlinearity of the solar panel output curve depending on the irradiation amount and the temperature, and the variation of the curve factor depending on the various panel materials, then the panel simulation function cannot be performed properly. Current and voltage mode controls are usually used for the conventional control method. However, these control methods deteriorate the control performance near the maximum power point; thus, a hybrid control method using two or more controllers has been investigated. In this study, we analyze the hybrid control method using three controllers divided into different areas. The design equation of the controller is derived based on the small signal modeling of each controller, and the simulation performance of the solar array simulator verifies its stability and response speed.

• Advances in Energy Research
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• 제1권2호
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• pp.97-106
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• 2013

This study designs and tests a photovoltaic system with distributed maximum power point tracking (DMPPT) methodology using a field programmable gate array (FPGA) controller. Each solar panel in the distributed PV system is equipped with a newly designed DC/DC converter and the panel's voltage output is regulated by a FPGA controller using PI control. Power from each solar panel on the system is optimized by another controller where the quadratic maximization MPPT algorithm is used to ensure the panel's output power is always maximized. Experiments are carried out at atmospheric insolation with partial shading conditions using 4 amorphous silicon thin film solar panels of 2 different grades fabricated by Chi-Mei Energy. It is found that distributed MPPT requires only 100ms to find the maximum power point of the system. Compared with the traditional centralized PV (CPV) system, the distributed PV (DPV) system harvests more than 4% of solar energy in atmospheric weather condition, and 22% in average under 19% partial shading of one solar panel in the system. Test results for a 1.84 kW rated system composed by 8 poly-Si PV panels using another DC/DC converter design also confirm that the proposed system can be easily implemented into a larger PV power system. Additionally, the use of NI sbRIO-9642 FPGA-based controller is capable of controlling over 16 sets of PV modules, and a number of controllers can cooperate via the network if needed.

• 정보통신설비학회논문지
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• 제8권1호
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• pp.36-39
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• 2009

In this paper, we propose a 4-wire type driving circuit for resistive touch panel which was manufactured at the lab. The circuit is designed by using the touch panel controller ADS7846 and AVR microcontroller board. The test result shows that the designed circuit can give and transmit the position information of touch panel to the computer.

• 한국산학기술학회논문지
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• 제11권10호
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• pp.3666-3672
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• 2010

본 연구는 옥외 광고를 위한 LCD 패널용 콘솔(이하 콘솔'이라 한다.)"의 내부온도 제어를 위한 냉각장치의 제어기 설계에 관하여 다루고 있다. 콘솔은 본 연구진에 의하여 개발된 것으로 냉각장치는 열전소자를 이용하여 사용조건에 적합하도록 설계하였다. 아울러 본 연구는 콘솔이 우수한 성능을 발휘할 수 있도록 제어전략과 그 방안을 제안하고자 한다. 본 연구의 구성은 먼저 시스템의 구조와 설계조건에 대하여 정의하였다. 이어서 동적 특성을 결정하는 파라미터를 측정한 후 분석을 위하여 시스템을 수식 모델링하였다. 끝으로 제어전략을 수립한 후 수식모형을 이용하여 제어기의 성능 검사를 위한 시뮬레이션을 실시하고 기존의 제어기 성능과 비교분석하였다. 본 연구의 목적은 비교분석을 통하여 보다 개선된 제어방식을 제시하는 것이다.