• Current Optics and Photonics
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• 제1권3호
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• pp.233-238
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• 2017

In this paper we propose a freeform secondary lens for an LED fishing/working lamp (LFWL). This innovative LED lamp is used to replace the traditional HID fishing lamp, to satisfy the lighting demands of fishing and the on-board activities on fishing boats. To realize the freeform lens's geometry, Gaussian decomposition is involved in our optics-design process for approaching the targeted light intensity distribution curve (LIDC) of the LFWL lens. The simulated results show that the illumination on the deck, on the sea's surface, and underwater shows only small differences between LED fishing/working lamps and HID fishing lamps. Meanwhile, a lighting efficiency of 91% with just one third of the power consumption can be achieved, when the proposed LED fishing/working lamps are used instead of HID fishing lamps.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제55권4호
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• pp.231-237
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• 2006

This paper proposes an effective drive of high intensity discharge (HID) lamp ballast for cars. All control functions of the proposed ballast are implemented using a low-cost single chip microcontroller, PIC16C73 to optimize the total system size and to minimize cost through minimization of total component number. The proposed ballast generates high open-circuit voltage to ignite the lamp and is controlled to supply effectively the power required to shorten warm-up period after the breakdown. The DC-DC converter of the DC-AC converter part of the ballast utilizes the flyback converter topology that can minimize component number. Also, because to more minimize the ballast size, the transformer size must be minimized, for this, PWM (Pulse Width Modulation) pulses are generated with high frequency using the PWM module of the microcontroller. An analysis for this is explained, briefly. As if the operation of the lamp and ballast arrives at steady-state, then the ballast must AC-control the lamp, for this, the microcontroller utilizes the other PWM module. And the part related to the igniter is explained, briefly. It is shown through experimental results that the controller of the proposed ballast has good performance for the HID lamp for cars.

• 조명전기설비학회논문지
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• 제17권2호
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• pp.10-16
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• 2003

최근 고급차의 헤드라이트용 램프로 메탈핼라이드 램프가 사용되어지면서 자동차의 고급스런 분위기와 많은 광량으로 인하여 사물의 판독이 용이하여 특히 야간 운전시 많은 사람의 안전에 기여하고 있다[1][2][3]. 그러나 현재까지 국내에게 개발된 안정기는 신뢰도 및 안정성이 낮기 때문에 고가에 수입하여 일부 차에만 적용되고 있는 상태이다[4]. 본 논문은 자동차 헤드라이트용 전자식 안정기에 관한 내용을 다루었다. 전자식 안정기의 구성은 플라이백 컨버터, 하프브리지 인버터, 램프 이그니션을 위한 이그나이터 부분으로 이루어졌다. HID 램프가 가지는 음향공명 현상을 피하기 위해서 400(Hz)의 구형파로 램프를 동작 시켰으며, 램프 점등 초기에 더 많은 에너지를 램프에 공급하는 방법으로 램프 동작 주파수를 가변시키는 방법과 동시에 램프 점등 상태를 안정화를 위한 상태 천이 전류 공급 회로를 사용하였다. 본 논문의 확인 및 평가는 12[V] 축전지와 35[W] HID 램프를 사용해서 확인하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 II
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• pp.1023-1026
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• 2003

An electronic ballast for driving automotive HID lamps is presented. The circuit topology is composed of a fly back converter, a Ful bridge inverter, and an igniter. A prototype was developed and tested on a 35W lamp with a 12V input voltage. To avoiding the acoustic resonance, the full bridge inverter is operated at 250Hz and provided a squared-wave voltage source to the lamp. The transient and steady state characteristics of the tested HID lamps are measured and analyzed.

• 조명전기설비학회논문지
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• 제28권4호
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• pp.9-15
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• 2014

An experiment was carried out to evaluate the emotion and sensibility evoked from the different color temperatures(CCT) of electrodeless HID (ELHID) lamp. For this purpose, three ELHID lamps and a metal halide lamp were used as the experimental light sources and thirty Korean adjectives related to the lighting affectiveness were selected for the evaluation. The results showed that ELHID lamps induced different sensibilities according to their color temperature. In particular, 6500 K ELHID was similar to metal halide which has the CCT of 5600 K in the evaluation. Based on the results, we suggested some Korean adjectives and their corresponding English ones which are thought to be suitable for the verbal descriptions of ELHID lamps.

• 전기학회논문지
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• 제58권5호
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• pp.944-949
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• 2009

A simplified power control technique for electronic ballasts of HID lamps is proposed. This power calculator and controller consist of regular operational amplifiers with some passive elements and form simple add operation circuit. From a mathematical model of designed ballast with proposed power controller, the control performance and stability are analyzed by using Matlab and the results show that the stable starting characteristics and steady state characteristics of HID lamp are appropriately guaranteed. The experimental results of the prototype ballast coincide with the simulation results.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.595-598
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• 1999

A new of the automotive High Intensity Discharge(HID) lamp ballast systems is proposed. Proposed scheme is consisted of the high frequency DC-DC converter and low frequency DC-AC inverter as same as conventional HID ballast system. But this system separates ignition voltage from dc link voltage, which results to used the lower voltage rating power devices for HID lamp ballast system compared with conventional system. As a result, proposed system has a lower cost and higher efficiency.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권8호
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• pp.545-550
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• 2000

This paper presents design and analysis of an HID lamp ballast for a fast turn on characteristics and stable operation. It produces a high open circuit voltage for the ignition and it is controlled to supply effectively the power required to shorten the warm-up period after the breakdown. The lamp modeling by empirical data is presented. It is very effective in the designing of the control loop in the steady-state operating region. A stable operation of the lamp power regulation in the steady state is achieved, which is crucial for the long life time and constant light output. Stability analysis of the system is performed and the results are verified through various simulation results and the hardware experiments.

• 조명전기설비학회논문지
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• 제23권6호
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• pp.24-30
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• 2009

본 논문에서는 HID 램프의 점등을 위한 3종의 점화기 비교 및 구동원리를 나타내었다. 또한 점화기와 램프사이의 케이블 길이에 따른 특성을 이론적 검증과 실험을 통하여 분석하였다. 점등전압은 점화기 구조와 케이블 길이 및 특성에 따라 달라지기 때문에 현장에서 많은 문제점을 안고 있다. 따라서 본 논문에서는 LC공진 타입의 점화기, Arc gap을 이용한 점화기, 주파수 가변을 동한 점화기를 대상으로 케이블 25[m] 거리에서 측정 및 분석하였다. 각각의 점화기 비교 및 케이블 특성을 분석하여 현장에서의 문제점을 해결할 방안을 제시하였다.

• 조명전기설비학회논문지
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• 제24권12호
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• pp.214-220
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• 2010

This paper presents the results of a study on an electrodeless high intensity discharge (HID) lamp system that is powered by circularly polarized microwaves (CPMs). The technique to generate CPMs enables an electrodeless high intensity discharge lamp to be turned on without the retation of the bulb but conventional electrodeless high intensity discharge lamps use rotating bulbs in order to prevent a puncture in a hot spots that are formed by the linearly polarized microwaves in the circular cavity. The technique to generate CPMs is described and the salient features of the lamp characteristics are presented.