• Proceedings of the KIEE Conference
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• 2008.04c
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• pp.251-253
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• 2008

This research combines LED display System with a module of solar cell which transforms solar energy to electrical energy. In order to simplify the installation and the movement of LED Display System, the system removed the conventional power distribution is developed, and that improves the advertising effect of LED Display System.

• Design & Manufacturing
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• v.15 no.3
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• pp.50-55
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• 2021

Solar power generation, which is one of the methods of using solar energy, has a high possibility of practical implementation compared to other renewable energy power generation, and it has the characteristic that it can generate as much power as needed in necessary places. In addition, maintenance is easy, unmanned operation is possible, and power management can be performed more efficiently if operated in a hybrid method with existing electric energy. Therefore, in this study, numerical analysis using a computer program was performed to analyze the efficient operation and performance improvement of solar energy of the rotating condensing type solar LED street lamp. As a result, the two-axis tracking type could obtain 15.23 % more electricity per year than the fixed type, and additional auxiliary power generation was required for the fixed type by 19 % per year than the tracking type. As a result of computational fluid dynamics(CFD) simulation for PV module surface temperature prediction, the The surface temperature of the Photovoltaics(PV) module incident surface was predicted to be about 10℃ higher than that of the fixed type.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.6
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• pp.1349-1354
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• 2021

An All-in-one LED lantern is a light device to determine the fairway of ships in operation. The current all-in-one LED lantern powered by solar energy is challenged by insufficient power capacity due to limited sun hours. This article presents an all-in-one 9-Nautical mile LED lantern driven by solar and wind power that is abundant maritime renewable energy. Furthermore, the remote smart monitoring system is developed. A smart control system capable of remote control of the lantern was implemented by using the LED lantern device and monitoring system as IoT. This technology that realtime condition monitoring and remote control are developed for safe ship navigation. We expect that maintaining the accuracy and consistency of LED lanterns prevents marine accidents and reduces social costs.

• The Transactions of the Korean Institute of Power Electronics
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• v.11 no.3
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• pp.201-208
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• 2006

An alternative to the nuclear and fossil fuel power is renewable energy technologies (hydro, wind, solar and ocean), and the research about the highest efficiency machinery have been processed. The high-power LED is the representative one among those. In this paper, a high efficiency lighting system using a battery charged with solar or wind power is proposed for a high power LED. And a new efficient converter called 'Back-boost' is proposed. The validity of the lighting system scheme is verified by experimental results based on a laboratory prototype.

• Journal of the Korea Society of Computer and Information
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• v.19 no.2
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• pp.109-115
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• 2014

The research on solar energy that we get from nature to cope with energy exhaustion is a very significant and inevitable task for us to do. Along with this, lately, in Korea, as part of new growth engine industry regarding low-carbon green growth, we have selected the LED(Light Emitting Diode) as low power consuming, eco-friendly lighting equipment and have been facilitating research and development on it and creating a variety of new industries utilizing it. What was developed here in this research was the photovoltaic LED lighting system applying lithium polymer batteries equipped with the excellent performance of lithium ion batteries as well as significantly low explosive hazard. Its photovoltaic panel was made to have 100W capacity, and for its power supply system, functional convenience was considered so that it could be equipped with both DC and AC power to be used as household electricity in a variety of ways.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.11B
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• pp.1394-1402
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• 2011

This paper describes solar light collecting system which employs parabolic reflector and Fresnel lens and its industrial application. We have introduced second-stage optical system so that it makes optical fiber overcome its numerical aperture limitation and also it makes focused light become collimated, which results in decreased light energy density. As result of these, light collecting efficiency become maximized and the system does not require separate cooling apparatus any more. The developed solar lighting system together with artificial light source like LED has been applied to plant factory as a hybrid lighting source. This makes us save electric energy for artificial lighting during day time. The intensity of LED light in the hybrid lighting system is controlled automatically according to ambient-light-sensor installed in the system so that the light intensity for a plant always keeps the same level no matter how the sun light changes. For a plant factory whose size is 330 square meters, when solar lighting system is applied, 28,080KWh electric energy can be saved per month.2 times.

• Journal of the Korean Solar Energy Society
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• v.31 no.2
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• pp.113-119
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• 2011

LED lighting has received much attention in recent years due to its high energy efficiency and environmental friendliness. As the color of light can be obtained by adjusting the light intensity of LEDs, the quality of visual environment can be improved. The aims of this study are to develop a wavelength adjustable LED lighting system and to examine its lighting performances. The LED lighting system and experimental cell for assessment of the lighting performance were constructed. This LED lighting system is able to materialize the various spectral power distribution and color temperature of light through the control of the four dimmers. Up to $432^4$ kinds of light combinations are possible. The range of illuminance on workplane were measured as 7~1,831 ㏓. Improvement of psychological and physical functions for occupants can be expected according to control of lighting performances.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.1
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• pp.371-374
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• 2011

In this paper, a software development for design of the small photovoltaic system which is used to LED lighting is presented. For optimal design of photovoltaic systems, the operating power consumption of the LED load is considered to estimate the capacity of the solar module and battery. In order to give system design engineers a high ease of use, the software tool provides a graphical user interface and monitoring function to check operation of the system prior to installation.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.32-34
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• 2011

본 논문은 최대전력추종 태양광 충전법을 적용한 LED 동기점멸등 제어시스템 설계 및 구현을 목표로 한다. 즉, 선박의 야간 안전항해를 돕기 위한 항로표지인 등부표에 장착되는 LED 동기점멸등의 구동제어 시스템, 최대전력추종 방식의 전류제어 벅 컨버터를 적용한 배터리 충전시스템의 설계 및 구현, 그리고 그 특성파악에 대해 중점적으로 다룬다. 시스템에 적용한 태양광 모듈의 모델링 및 MATLAB 시뮬레이션을 통해 추출한 태양전지 파라미터를 충전회로 시스템에 적용하여 최대전력추종 태양광 충전시스템을 설계하였다. 따라서, 본 논문에서는 원칩 마이크로컨트롤러를 사용하여 최대전력추종(MPPT) 태양광 충전제어시스템과 GPS활용 LED 동기점멸등 구동제어시스템을 구현하여, 그 특성파악을 통한 실시스템 적용가능성을 확인하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.743-744
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• 2012

LED digital control convergence technology is receiving attention. It enables to analyze lighting and living environments by recognizing user information and situations through a signal process system composed of a multi-functional composite sensor's module. LED lighting is higly efficient, long-lived, environmentally, and is possible to converge with communication, and receiving as a next-generation general lighting that will replace a florescent light including the light bulb. The proposed system is an intelligent LED control system that uses solar light. This study is about a lighting control technology associated with user-estimated information/situation and related low-cost technology. Also, this study aims to embody emotional lighting by appropriately lighting 10% of the discharge current with supplementary colored LED according to the surrounding environment.