• 한국전기전자재료학회논문지
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• 제31권1호
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• pp.1-5
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• 2018

This study analyzed the change of electrical characteristics of a photocoupler when a narrow-band electromagnetic wave was combined with the photocoupler. A magnetron (3 kW, 2.45 GHz) was used as the narrow-band electromagnetic source. The EUT was Photocoupler (6N139) and the input signal was divided into two types: a square pulse and the second signal is 0 V. The malfunction of the photocoupler was confirmed by monitoring the variation in the output voltage of the photocoupler. As a result of the experiment, changes in the malfunctioning was observed as the electric field was increased. There are three types of malfunction modes: delay, output voltage off, and fluctuation. Bit errors were analyzed to verify the electrical characteristics of the photocoupler by narrow-band electromagnetic waves. The result of this study can be used as basic data for the effect analysis of photocoupler protection and impact analysis of high-power electromagnetic waves.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 하계학술대회 논문집
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• pp.798-801
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• 2001

we have investigated a characteristic of a vibration displacement detector, which was made with a photocoupler. Output signals of the detector were dominant at 700Hz of the frequency of vibrator, and It was maximum, when the amplitude of input signal had been at 1.1V. The detector will be used in measuring the surface roughness of substrates.

• 한국정보전자통신기술학회논문지
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• 제11권6호
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• pp.732-741
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• 2018

여러 배터리 셀을 직렬로 연결해서 사용하는 BMS에서 사용 가능 용량을 최대화시키기 위하여 각 셀의 전압을 같도록 맞춰주는 셀 밸런싱 기술이 필요하다. 다중 권선 변압기를 사용하는 능동 셀 밸런싱 회로에서 셀 간 직접적 (direct cell-to-cell)으로 에너지를 전달하는 밸런싱 회로는 PMOS 스위치와 NMOS 스위치를 구동하기 위한 게이트 구동 칩은 PMOS 스위치와 NMOS 스위치 개수 만큼 TLP2748 포토커플러(photocoupler)와 TLP2745 포토커플러가 필요하므로 원가가 증가하고 집적도가 떨어진다. 그래서 본 논문에서는 포토커플러를 사용하여 PMOS와 NMOS 스위칭소자를 구동하는 대신 70V BCD 공정기반의 PMOS 게이트 구동회로와 NMOS 게이트 구동회로, 스위칭 시간이 개선된 PMOS 게이트 구동회로와 NMOS 게이트 구동회로를 제안하였다. 스위칭 시간이 개선된 PMOS 게이트 구동 스위치의 ${\Delta}t$는 8.9ns이고, NMOS 게이트 구동 스위치의 ${\Delta}t$는 9.9ns로 양호한 결과를 얻었다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 V
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• pp.2835-2838
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• 2003

We study the characteristics of oscillating in non-autonomous condition and the conducted noise generation in a RL-photocoupler circuit. This circuit may be shown a period-doubling and a chaos dynamics under any specific conditions of input circuit. But, the relationship between input signals and output signals is different according to the amplitude of driving input voltage. Then, the oscillation noise was analyzed with respect to both the frequency and the amplitude of an external ac signal and do values. The results show that the noise-induced oscillations for falling and rising cycles induced by kick-back effect in an inductor, nonlinear capacitance, nonlinear resistance and charge storage time in a diode and an LED. We also compared the simulation with the experimental results.

• 한국산학기술학회논문지
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• 제10권2호
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• pp.215-221
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• 2009

최근 원격검침에 대한 많은 방식의 연구 및 개발이 진행되고 있지만, 검침 값의 신뢰성, 전원공급 등 여러가지 문제점이 나타나고 있다. 이러한 문제점들을 포토커플러를 이용한 디지털 펄스 계량기와 RF 모듈을 이용하였다. 본 연구에서 구현한 포토커플러와 RF, CDMA 통신을 활용한 원격검침 시스템은 기존의 시스템의 전 과정을 무인자동화 할 수 있고, 구역별 사용량 데이터 관리로 누수 상태의 실시간 확인이 가능하다. 그리고 사용자가 직접 확인이 가능하여 민원발생을 최소화할 수 있을 것이다. 더 나아가 지속적으로 증가하는 고령 인구들에 대한 실버산업의 일환으로 독거노인들의 안전관리시스템으로도 도입할 수 있을 것이다.

• 전기의세계
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• 제24권6호
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• pp.85-91
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• 1975

A new design method for the SCR-Chopper type speed controller of the battery-powered vehicles was developed. The conventional speed-controllers were either inductance type or contact type using resistance. In the new method, a photocoupler was used in sensing the control currents and a noncontacting type photo-conductive device (CDS) was used in mading acceleration. Experiments using these new devices showed encouraging results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 D
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• pp.1324-1326
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• 1998

To drive motor or heating machine, it needs the electric power system like the apparatus of inverter. This electric power system obviously comprises power switching devices and drivers to run them. And this system has the topology comprised one/many arm(s), - each arm has high side switching device and low side switching device. Transformer, photocoupler, and HVIC having functions of isolation and level shift which are important thing to drive high side switching device are used as component of drivers in conventional apparatus. Piezoelectric transformers are proposed in this paper, and applied to drive high side swiching device. Through experiments, the possiblities of driving high side switching device are presented and the problems are mooted concurrently. But, we also consider a counterplan for solving the mooted trouble issues.

• 한국식품저장유통학회지
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• 제1권2호
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• pp.99-105
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• 1994

To convert the analog signal from the drying process into the digital signal, the interface circuit was designed and built. To measure the weight and temperature during drying process, strain gauge type load cell and temperature transducer composed of pt 100 $\Omega$ thermometers and wheatstone bridge circuits were built and used. The temperature control device was composed of photocoupler and triac. Microcomputer aided experimental convective drying system was built with above cricuits and devices. Drying characteristics of onions can be estimated using this system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 G
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• pp.2458-2460
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• 1998

To drive motor or heating machine, it needs the electric power system like the apparatus of inverter. This electric power system obviously comprises power switching devices and drivers to run them. And this system has the topology comprised one/many arm(s), - each arm has high side switching device and low side switching device. Transformer, photocoupler, and HVIC having functions of isolation and level shift which are important thing to drive high side switching device are used as component of drivers in conventional apparatus. Piezoelectric transformers are proposed in this paper, and applied to drive high side swiching device. Through experiments, the possiblities of driving high side switching device are presented and the problems are mooted concurrently. But, we also consider a counterplan for solving the mooted trouble issues.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 춘계학술대회 논문집
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• pp.419-423
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• 2004

This paper shows a new concept of digital power meter based on the optical sensing technique. The digital power meter with isolate IC so called Photocoupler is designed and implemented. The system composed of power and analong interface circuits, micro-controller and LCD display circuits. The most errors in power meter happen on measurement and calculation process for load voltages and currents. The suggested method on this paper is to use no noise sensor and PIC microprocessor. The results of simple test for power meter prototype are showed a nearly similar date to commercial product.