• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2007.05a
• /
• pp.64-69
• /
• 2007

실내조명의 조도 기준을 만족하는 LED Bulb를 개발하기 위하여 LED 개수를 선정하고, 실내 전반 조명에 적합한 배광을 실현하기 위한 렌즈설계를 하였다. 그리고 LED로부터 발산되는 열을 최적화하기 위한 방열설계를 행하여 주위온도 $50^{circ}C$ 이내에서 동작 가능하도록 하였다. 또한 시제품의 외함에 내장되어 질 수 있는 소형의 20[W]급 전원회로를 설계하고, 시제품을 직접 제작하였다. 시제품의 전기적, 광학적 성능은 CFL의 성능과 거의 동일하다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2008.10a
• /
• pp.129-131
• /
• 2008

본 논문에서는 야간 경관 조명기구에 대하여 유지보수 및 광해를 유발할 수 있는 요인을 파악하고 이를 해결하기 위해 저전력 소모, 장수면의 장점을 가지고 있는 LED를 적용한 비대칭 배광을 가지는 LED Floodlight용 렌즈를 설계하였으며 그 성능 평가 및 설계된 렌즈를 적용한 조명기구를 예측하였다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.25 no.12
• /
• pp.1-10
• /
• 2011

Recently medical facilities that can help to heal the interpretation have evolved as a healing space. Accordingly, the patient's emotional, psychological and social ward plan to meet the needs of the patient to recover is important. The medical team is also related to the nature of human life, so they are experiencing high stress levels compared to other professionals. However, most places don't consider the user's psychological behavior. The purpose of this study is to build user-friendly lighting environment using LED lighting. LED lighting is easy to adjust illuminance and color temperature, and it is can be implemented in the medical area.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.28 no.6
• /
• pp.29-39
• /
• 2014

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.27 no.3
• /
• pp.28-33
• /
• 2013

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.15 no.6
• /
• pp.52-67
• /
• 2001

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.24 no.6
• /
• pp.706-713
• /
• 2020

To control the LED lighting for broadcasting, LED current control using tri-stimulus values is used for RGB LEDs. For the convenience of control, this control is approximated as a linear function or used as an appropriate value through trial and error. Also, it is not suitable for broadcast lighting because it does not use a diffuser plate applied for mixing sufficient light and color required for actual it. In this study, a neural network with excellent nonlinear function approximation is used as a control method for LED panels for broadcast lighting. We intend to implement an LED panels controller suitable for the desired chromaticity coordinates and dimming values of intensity. As a result of the performance evaluation, the errors of the xy chromaticity coordinates are mostly ±0.02 and the acceptable range of ANSI C78.377A was satisfied. The average errors of the xy chromaticity coordinate are xerror=0.0044 and yerror=0.0030, respectively, and we confirmed the superiority and stable performance of the proposed algorithm.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.14 no.3
• /
• pp.243-250
• /
• 2009

This paper provides an novel two-stage LED driver circuit for LED lighting equipment. The proposed driver circuit reduces voltage stress in LED driver circuit by using multi-level output voltage of PFC flyback converter. The proposed circuit satisfies IEC61000-3-2 class C regulation that is applied to lighting equipment over 25W and uses PWM to control brightness of wide extent. In this paper, the principle of proposed driver circuit is presented. A prototype has been built and tested. The experimental results are presented to show the validity of the proposed circuit.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2012.10a
• /
• pp.11-12
• /
• 2012

In this paper, efficient visible light communication technology LED (Light Emitting Diode) lighting through the existing infrared sensor used for performance analysis of transmitting and receiving is possible. LED utilizes lighting by changing light into electricity. Lighting features while maintaining the basic principles of flashing LED and PD (Photo Diode) to send and receive communications from LED lighting communication convergence principle be realized simultaneously enabling. Multiple IT applications under the basic structure of LED technology development, and the current was encountered in real life. LED lighting anywhere with wireless communication technology that can, in order to ~ 1m above the initial value by taking advantage of the system H/W and infrared sensors(PD) are widely used in the entire system that can improve the speed of visible light data transmission system is finished. LED module that is used to communicate whether the performance analysis, For forecasting and communication distance on the LED and infrared sensor configuration of the implementation of the research is to study about the possibility of application methods and indicates.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.15 no.7
• /
• pp.4489-4493
• /
• 2014

LED light driving device has problems in efficiency and heating at higher than 150W. In addition, there is inconvenience in replacing the lighting device to another when W is not the same as the previous one. In this paper, a multi-channel LED light driver, driver embedded driver circuit in a multi-channel structure with a power system in the driver-interlocking structure was designed. With the auto control converter structure with a power efficiency above 93% and power factor above 0.98, the weight of the high efficiency LED lighting-actuating device in driver-interlocking structure, a driver in self-calibrating self-optimization structure. In this paper, at below 10% THD, the existing converter contrast weight was reduced by 40% or more.