• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1114-1118
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• 1992

This paper deals with the analysis of the electronic ballast which is based on half-bridge type series inverters. First, design basis was described for the determination of the values, L and C. Next, the operation of the electronic ballast was analyzed theoritically. Finally. the digital simulations and experiments were carried out to prove the obtained theoritical results.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2562-2564
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• 1999

We have development the electronic ballast for metal halide discharge (MHD) lamp. The ballast consists of the boost pre-converter for power factor correction (PFC), a flyback a converter, half-bridge inverter and ignitor. To reject acoustic resonance phenomena, we have designed electronic ballast driving with the low frequency square wave. As results of this study, the ballast had not flicker phenomena and promoted corrected the factor (PF) highly

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2005.11a
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• pp.252-253
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• 2005

This paper describes a improvement of power control characteristics of ship's emergency lighting power supply(SELPS), that power factor(PF) is improved and electric power is controlled extensively, and power ON-OFF is controlled and system parameter monitored in remote distance by PC serial communication.

• Proceedings of the IEEK Conference
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• 2002.06e
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• pp.319-322
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• 2002

In this Paper, we suggested the Half-Bridge inverter for the automotive HID electronic ballast. electronic ballast for automotive HID lamp should be supplied by low-frequency square wave avoiding the acoustic resonance(11kHz ∼ 825kHz). When the HID lamp is hot state, the electronic ballast should supply the sufficient current for a few milli-second to the lamp at the re-strike ignition state. that is called take-over current. We have introduced the new take-over current control method that could have reduced the peak current and supplied the sufficient take-over current.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.999-1000
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• 2008

150W의 정격을 가지는 150W-CDM, HCI, CMH 세라믹 메탈 할라이드 램프의 음향공명주파수를 계산하여 예측하고 Half-Bridge구조의 Inverter로 각 램프를 점등하여 음향공명이 발생할 경우와 발생하지 않을 경우의 램프 특성을 분석한 결과 음향공명 발생시 30Hz이하의 낮은 주파수의 전류 신호가 포함됨을 확인하였다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2000.11a
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• pp.9-12
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• 2000

본 논문은 고압 나트륨 램프용 전자식 안정기의 회로 특성을 보다 효율적이고 경제적으로 비교 평가하기 위해, Pspice를 이용하여 전자식 안정기 구동회로를 시뮬레이션하고 이를 실제 안정기 출력과 비교한 논문이다. 본 논문에서 사용한 방식은 공진형 인버터를 이용한 Half-Bridge Inverter 구조의 자려식 구동방식으로서 실제 안정기의 동작 특성과 같은 시뮬레이션 결과를 얻을 수 있었다.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.75-76
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• 2010

MOSFET 스위칭 소자를 사용하여 하프 브릿지 인버터를 구성하였고 게이트파형과 인덕터, 커패시터의 공진, Preheat 동작을 PSIM으로 구현하였다. LC 공진으로 통해 절연이 파괴되어 램프가 켜지고 Preheat 로 램프 전극 양단에 병렬로 연결되는 LC공진콘덴서 의해 예열되어 불필요한 전력소모를 줄이고 나타내었다. 램프가 켜지는 순간부터 가변저항을 이용하여 램프의 밝기를 조절 할 수 있게 구상하였으며 그 결과를 PSIM으로 시뮬레이션 하였다.

• Journal of the Korean Society for Railway
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• v.9 no.6 s.37
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• pp.761-765
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• 2006

At present, harmonic currents cause serious problems in power conversion system using the semiconductor switching device. Also some of the conversion system provokes harmonic currents against to the main power supply system and causes hindrances for the system. Main power impedance of the traditional LC passive filter method, influences on the filter characteristics and amplifies the harmonics when resonance phenomenon is occurred. And the traditional existing 2 level inverter systems show the limit in capacity of voltage and current in case of occurring sudden load change. So, to solve this problem active filter which uses cascaded H-bridge multi level inverter has been designed and ex-filter system circuits were totally investigated. With multi level active filtering system not only the size of filter but also the size of filter for transformer can be reduced by half and so as to the weight, while the capacity of inverter can be double sized and wave forms can be compensated exactly and precisely. Also by the benefit of the increase in rating capacity, the various currents owing to the load fluctuation can be dealt more steadily. In order to simulate the wave form of harmonics based on the measured data on the AC 25kV high speed Domestic Commercial railway, it was simulated with PSCAD/EMTDC and PSIM. Based on the results of this demonstration, the power supply system and inverter system would be more stable and also promoting its efficiency.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.54 no.12
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• pp.601-608
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• 2005

This paper presents a novel single-stage high-power-factor electronic ballast for fluorescent lamps operating in critical conduction mode. The proposed topology is based on integration of boost converter as power factor corrector(PFC) and a half-bridge high frequency parallel resonant inverter into a single stage. The input stage of the boost converter is operating in critical conduction mode for positive and negative half cycle voltage respectively at line frequency(60Hz). So that a boost converter makes the line current follow naturally the sinusoidal line voltage waveform. The simulated and experimental results for 100W fluorescent lamps operating at 42kHz switching frequency and 220V line voltage have been obtained. This proposed inverter will be able to be practically used as a power supply in various fields as induction heating applications, fluorescent lamp and DC-DC converter etc.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.11
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• pp.1981-1987
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• 2008

This paper proposed one of various acoustic resonance reduction technique for three kinds of ceramic lamps (CDM-150, HCI-150, CMH-150). To reduce the acoustic resonance in the HID lamps, the researched results showed that the frequency modulated signal with the triangle waveform is very effective in order to drive th LCC type half-bridge inverter for HID lamp. Experimental results proved that the acoustic resonance could be rejected, if the adequate switching frequency band is selected and the driving signal frequency is modulated with a triangle waveform.