• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.23 no.5
• /
• pp.66-71
• /
• 2009

The solar photovoltaic power generator can get more power with the higher solar radiation quantity. However, if the higher solar radiation quantity on cell becomes high temperature, the efficiency of generate will be reduced. To install cooling system for this kind of device can be the way to solve high temperature problem on cell but another problems after install it such as increasing of solar generated quantity problem cost to install cooling system and cost to be maintained cooling system weren't discussed to practical use this system. So the present paper described about effect and commercial business possibility of cooling system. After installing a cooling system the results of experiment about 5.76[%] average annual increasing of solar photovoltaic can expect.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.20 no.7
• /
• pp.74-80
• /
• 2006

This paper describes a solar energy conversion strategy is applied to grid-connected single phase inverter by the maximum power point of conversion strategy. The maximum power point of tracking is controlled output power of PV(photovoltaic)modules, based on generated circuit control MOSFET switch of two boost converter for a connected single phase inverter with four IGBT's switch in full bridge. The generation control circuit allows each photovoltaic module to operate independently at peak capacity, simply by detecting of the output power of PV module. Furthermore, the generation control circuit attenuates low-frequency ripple voltage. which is caused by the full-bridge inverter, across the photovoltaic modules. The effectiveness of the proposed inverter system is confirmed experimentally and by means of simulation.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2008.10a
• /
• pp.189-192
• /
• 2008

The solar photovoltaic Power generator can get more power with the higher solar radiation quantity. However, if the higher solar radiation quantity on cell becomes high temperature, the efficiency of generate will be reduced. To install cooling system for this kind of device can be the way to solve high temperature problem on cell but another problems after install it such as increasing of solar generated quantity problem, cost to install cooling system and cost to be maintained cooling system weren't discussed to practical use this system. So the present paper described about effect and commercial business possibility of cooling system.

• Korean Journal of Optics and Photonics
• /
• v.27 no.2
• /
• pp.73-80
• /
• 2016

In this paper, we report the results of a study on the design and fabrication of a light-guiding plate (LGP) using a hybrid light-emitting diode (LED) and sunlight source that can be applied to a photobioreactor. LGP patterns for the LED source were designed and engraved on an LGP, together with previously reported patterns for a sunlight source. A control system for the hybrid LGP was designed to maintain the output photon flux density (PFD) from the LGP at a constant value. When the target value of the output PFD was set to $70{\mu}E/(m^2{\cdot}s)$, the error range of the output PFD was found to be within ${\pm}2%$.

• Journal of the Korean Solar Energy Society
• /
• v.31 no.2
• /
• pp.31-36
• /
• 2011

LED is expected as an environmentally friendly next generation light source with its good reliability and long lifetime. The light sources for illumination have a variety of applications in the indoor and outdoor, and the variation of optical power and color rendering of the light source limits their applications. Therefore, it is necessary to research the LED lamp and its luminaire to minimize the variation of dynamic characteristics and to improve the color rendering due to that illuminating environment. Daylight is very good light source to human and can be used as primary or a secondary light source with benefits of energy, productivity and health.This paper presents the design method of LED lighting system to improve poor property in terms of CR(color redering) characteristic to use daylight effectively.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.4 no.1
• /
• pp.8-10
• /
• 1990

현재 조명은 가시광선 영역의 빛만을 다루나 광의 다른 성질을 살펴보면 다른 과학적, 산업적 분야에의 광원의 응용이 지대함을 알 수 있다. 이를 위하여 빛의 기본특성이 그 파장별로 고찰된다. (1) 가시지역에서의 효과는 자명하나, 이를 눈의 감광도 곡선, 태양광선의 Spectrum, 텅스텐 광원의 Spectrum 등을 통하여 더 연구될 수 있다. (2) 자외선 및 청색부근의 파장은 반도체 및 인쇄산업에서 필수적인 각종의 감광 물질에 가장 효과적인 빛이며, 광원의 산업에의 응용이 기대될 수 있다. (3) 적외선은 열효과선이며, 적외선 물리학을 통하여 광원의 가능한 응용을 탐색할 수 있다.

• Proceedings of the Optical Society of Korea Conference
• /
• 2009.10a
• /
• pp.38-39
• /
• 2009

친환경, 신 재생에너지 중 하나인 태양광은 크게 발전용과 조명용으로 사용될 수 있다. 자연채광시스템에 주요부품인 태양광을 전달하는 자연채광용 유리광섬유를 국내최초로 개발하였다. 적용된 자연채광시스템에 대해 소개하고 광섬유와 광케이블의 기본구조, 광학적 특성, 벤딩조건에 따른 조도변화 및 스펙트럼을 분석하였다. 조명용 뿐 만 아니라 식물성장용으로도 사용가능하여 지하농원 등의 적용이 가능하다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.11 no.8
• /
• pp.2999-3004
• /
• 2010

In comparison with some other light sources, LED has merits such as long lifetime, pollution free, and high energy efficiency. Lately, due to development of LED with high brightness and capacity, LED, which has been applied in display system only, has applied in the field of lighting system. As power LED for lighting system can be burned out by heat problem, the driving current of power LED has to be controlled below the designed value. In this paper, power LED photovoltaic lighting system, which has the current limitting function, has been described. After photovoltaic power is generated from PV panel. it is charged into a battery. And then, after the charged power is converted to DC24[V] through a boost DC-DC converter, it is supplied to power LED at night. It has been validated by designing and testing of 72[W] power LED lighting system, which includes a PV charger, a boost DC-DC converter and a current limiter for driving power LED.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2001.11a
• /
• pp.129-132
• /
• 2001

LED는 오랫동안 가전제품이나 각종 기계의 표시소자로 사용되어 왔으나, 최근 LED가 고취도화 되면서 LED를 이용한 조명제품 개발이 활발하게 이루어지고 있다. 본 논문에서는 RGB LED를 이용한 LED 전구를 설계하기 위해 광학설계 프로그램 LightTools을 이용하였다. RGB LED의 비율과 배치에 따른 태양광과 비슷한 백색광을 얻기 위해 RGB LED의 비율을 R:G:B=1:1.5:3, 하여 CIE 색좌표 x:y=0.342: 0.291, 색온도 5100[K]의 값을 얻었다. RGB LED의 대칭, 원형, 간격별 배열에 따른 배치를 통하여 색좌표 x:y= 0.337: 0.297인 백색광을 얻었다. 이 같은 결론을 바탕으로 RGB LED전구를 설계하였다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2009.10a
• /
• pp.55-58
• /
• 2009

Photovoltaic system that is overcoming the problem of fossil fuel, changes the output quantity rapidly according to the temperature of module. so, we studied this principle and considered the method making lower the temperature of module for maximization of electric power production. In this thesis, we concluded that, we fit on below and upper direction of the module to decrease at the same temperature. lower temperature of below direction is more useful for the generating quantity.