• 전기학회논문지
• /
• 제56권12호
• /
• pp.2157-2165
• /
• 2007

A novel design technology for a high frequency electronic ballast for metal-halide discharge lamps is proposed. A PFC technique is adopted to get unit power factor and output frequency alteration technique is adopted to avoid acoustic resonance. For characteristics evaluation, the designed electronic ballast is presented using normalized parameter. To reduce losses of the ballast. ZVS control technique is adopted and the maximum flux density of magnetic core for inductor should be kept lower. The electronic ballast for 250[W] metal-halide discharge lamp is implemented and 96[%] efficiency and low conducted EMI level are accomplished.

• 산업기술연구
• /
• 제29권B호
• /
• pp.193-198
• /
• 2009

In this paper, we developed remote dimming control system of electronic ballast for 400W metal halide lamp. This ballast could limit ignition current and soft start-up technique by the inverter with LCsCp resonance tank. The dimming circuit can dim from 400W to 200W by varying of the inverter switching frequency. The PLM consists of coupling circuit, BPF(Band-Pass Filter), FSK(Frequency Shift Keying) Modem and ${\mu}$-controller(Micro Controller). By coupling electronic ballast with PLM, the system that able to dimming the lamp through PLM is demonstrated by experimental results.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
• /
• pp.163-165
• /
• 2004

A low-cost electronic ballast using a conventional HID controller IC is proposed. The proposed ballast consists of high frequency DC-DC converter, low frequency DC-AC inverter, and igniter circuit. This ballast shows hot-restrike, suitable operation at each stage of various lamp state and stable operation in steady-state.

• 한국조명전기설비학회:학술대회논문집
• /
• 한국조명전기설비학회 1999년도 학술대회논문집-국제 전기방전 및 플라즈마 심포지엄 Proceedings of 1999 KIIEE Annual Conference-International Symposium of Electrical Discharge and Plasma
• /
• pp.114-118
• /
• 1999

This paper shows a structure for an electronic ballast of HID lamps. An electronic ballast for HID lamps usually employs a high-frequency resonant inverter and voltage-to-frequency converter to control the output. A half-bridge and series resonant circuit are chosen for the ballast. The inverter with V/F converter is modeled with a transfer function and a self-feedback controller is proposed. This structure is analyzed and the feedback gain is determined by using the inverter model. Experimental system is built with a commercial 250W high pressure sodium lamp and the results show a validity of the proposed ballast.

• 한국조명전기설비학회지:조명전기설비
• /
• 제13권2호
• /
• pp.149-149
• /
• 1999

This paper is to present a selected method of circuit parameters in the inverter part of the electronic dimming ballast for fluorescent lamps, that is adequate to use with the prevailing dimming controller IC. Through the experiment result using the prototype of the electronic dimming ballast produced by this method, its validity is verified from the electrical and light output characteristics on fluorescent lamps. Also, it is feasible to remote automatic and passive control fur dimming electronic ballast as using a microprocessor, and we easily recognize the lamp condition owing to make a program indicate abnormal behavior for fluorescent lamp at PC screen.

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

• 전기학회논문지
• /
• 제58권10호
• /
• pp.1947-1953
• /
• 2009

Metal halide (MH) lamps have been largely used due to high luminous efficiency, good color rendering, and long life. Since the metal halide lamps have problems of high ignition voltage and acoustic resonance. Thus, the design of ballast is very difficult for engineers. This paper proposes prototype of electric ballast in order to solve above two problems. The proposed electric ballast is consisted of EMI filter, full wave rectifier circuit, active PFC, DBI(Dual Buck Inverter), dimming circuit and ignitor circuit. The DBI supplies both rectangular voltage and current to the lamp. As the result of the experiment, the acoustic resonance was eliminated and the ignitor circuit was designed to generate high ignition voltage than 5kV. It makes the dimming circuit possible to control the lamp power in range between 230W and 350W.

• 전력전자학회논문지
• /
• 제10권4호
• /
• pp.356-362
• /
• 2005

본 논문에서는 외부 이그니터가 없는 간단한 고효율 안정기를 만들기 위해 커플 인덕터와 주파수가변. 동기 정류기를 이용한 하프 브리지 방식의 안정기를 제안한다. 램프 점등시 고압을 발생시키기 위해 벅 컨버터 내부의 LC 공진이 사용되었고, 정상상태의 리플을 줄이기 위해 커플 인덕터가 사용되었다. DC/DC컨버터로는 동기형 벅 컨버터가 사용되었다. 안정기의 효율을 높이기 위해 가변 주파수 방식을 제안하였다. 이 방식은 순환 전류와 정전력 동작 하에서 MOSFET 스위치의 턴 오프 손실을 감소 시켜 고정 주파수 방식에 비해 안정기 효율을 약 4$\%$ 향상 시킨다. 회로 구성은 PFC와 안정기 2단으로 구성된다 결과는 실험을 통하여 검증된다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제55권4호
• /
• pp.238-243
• /
• 2006

This paper presents novel ignition method for automotive 35W metal halide discharge lamp electronic ballast. At this study, the novel method of ignition is developed to reduce costs and size of the ballast. By use of the novel method, the voltage needed in ignition is decreased, which result in use of the lower voltage rating power devices compared with conventional method and product compactness was achieved by deleting a circuit generating negative voltage needed in ignition at an conventional circuit. In terms of luminosity, color rendering, light efficiency(lm/W) and lifespan, the metal halide lamp is superior to, but unlike halogen lamp, it have more complicated transient characteristics to reach its steady state than the conventional halogen lamp. Therefore, in this paper, the electronic ballast was designed such that the metal halide lamp could be optimized for the automotive, by applying a method of microcontroller-based digital control. The results of the proposed system is verified through various experiment results.

• 조명전기설비학회논문지
• /
• 제13권4호
• /
• pp.14-20
• /
• 1999

일반적으로 전자식 안정기는 고주파 공진 인버터와 출력을 제어하는 전압-주파수 변환기로 구성되며 half-bridge 및 직렬공진회로가 사용된다. 본 연구에서는 첫째, PI 제어기를 설계하기 위해 V/F 변환기를 포함한 공진 인버터를 모델링하여 전달함수를 구하고 제어기 PI게인을 결정하였다. 그리고 전류제어를 위한 PI제어기는 적분기 만으로 구성됨을 보인다. 둘째, 자기궤환형 제어기를 제안한다. 강인하며 단순한 이 제어기는 인버터 선형모델을 이용하여 궤환게인이 결정된다. 실험을 위해 250W 고압 나트륨램프를 제안된 안정기로 점등하였으며 제안된 방법의 타당성을 확인하고 자기식 안정기에 비해 전체 효율 5% 향상을 달성하였다.