• Proceedings of the KIEE Conference
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• 2007.10c
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• pp.163-165
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• 2007

본 연구는 무전극 형광램프의 램프 이상 유무를 검출하여 램프에 이상이 발생한 경우 이를 검출하여 전자식 안정기 회로를 보호하는 방법을 제안하고 실험을 통해 검증한다. 제안된 보호회로는 램프 양단에 걸리는 전압을 검출하여 디지털 회로에서 이용할 수 있는 신호로 변환해주는 아날로그 회로부와 이 신호를 이용해 안정기 회로의 인버터 부에 공급되는 PWM 신호를 제거해 주는 디지털 회로부로 구성된다. 제안된 알고리즘은 개발 비교기 IC 소자와 EPLD를 이용해 간단한 회로로 제작되었으며, 차후 집적화에도 유리할 것으로 판단된다.

• The Transactions of the Korean Institute of Power Electronics
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• v.5 no.5
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• pp.501-507
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• 2000

A nobel low-cost, simple and unity-power-factor electronic ballast is presented. The proposed electronic ballast employs a bypassing capacitor- and load networks composed of ballast capacitors and small charge pump capacitors as power factor correction circuit combined with the secondary winding of the transformer in the self-excited current-fed push-pull resonant inverter(CF-PPRI), resulting in cost-effectiveness and higher efficiency. By analyzing the princip1es of power factor correction mathematically, optimum design guidelines are presented. Since the lamps are used in power factor correction stage, the input power is automatically adjusted according to the number of the lamps.

• The Transactions of the Korean Institute of Power Electronics
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• v.4 no.6
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• pp.515-522
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• 1999

Several power factor correction(PFC) circuits are presented to achieve high PF electronic ballast for both v voltage-fed and current-f,어 ek'Ctronic ballast. The proposed PFC circuits use valley-fil[(VF) type DClink s stages modified from the conventional VF circuit to adopt the charge pumping method for PFC operations d during the valley intervals. In voltage-fed ballast, charge pump capacitors are connected with the resonant c capaCltor In current-fed type, the charge pump capacitors are connc'Ctc'Cl with the additional second따y-side of t the power transformer. The measured PF is higher than 0.99 and THD is about 10% for all proposed PFC c circuits. The lamp current CF is also acceptable in the proposed circuits. The proposed circuit is suitable for i implementing cost longrightarroweffective electronic ballast.

• Electric Engineers Magazine
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• v.231 no.11
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• pp.25-28
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• 2001

• Electric Engineers Magazine
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• v.232 no.12
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• pp.24-27
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• 2001

• 전기의세계
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• v.52 no.8
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• pp.47-56
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• 2003

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.2
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• pp.9-17
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• 2002

A high-efficiency electronic ballast for HID lamps is presented. The ballast consists of a PFC and a resonant inverter. To reduce losses of the ballast, DC link voltage should be determined by taking into account the peak voltage of lamp and the maximum flux density should be kept 0.2[T] on all of inductors. AR inductor at bridge diode is employed in order to remove currant harmonics from PFC. An inductor is connected in series with an electrolytic capacitor at DC link to reject high-frequency current. The acoustic resonance is eliminated using the stead spectrum technique. The electronic ballast for 250[W] metal-halide discharge lamp is implemented and 96[%] efficiency, no acoustic resonance and low conducted EMI level are accomplished.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.39 no.3
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• pp.228-238
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• 2002

This paper presents a digital controller of the electronic ballast using high frequency modulation method for the metal halide lamp. The proposed controller includes the control algorithm for soft starting, no load protection, over current protection and power control. The proposed digital controller, moreover, has the high frequency modulation scheme and the tracking algorithm to avoid acoustic resonance phenomena. For the math production with the low cost using the ASICs (Application Specific Integrated Circuit), the proposed digital controller has been designed with the FPGAs(Field Programmable Gate array) only, without any microprocessor. In this paper, the detail digital control algorithms are described and the experimental results of prototype 150w metal halide electronic ballast are presented.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.4
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• pp.8-14
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• 2004

In this paper, We designed the electronic ballast power factor corrected(PFC) circuity for an 400[W] hight pressure soldium lamp using boost-converter. The values of PFC elements in the proposed boost-converter circuit are calculated theoretically and performed simulation using IsSPICE. We also implemented the ballast for high pressure sodium lamp and experiments. We found that the experimental characteristics of implemented PFC circuit were same with those of simulation results. The experimental results show the performance as PF 90.3[%] at output 400(W).

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.4
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• pp.20-25
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• 2003

This paper presents the PFC method for an electronic ballast using SEPIC converter. Generally, the Boost Converter Type PFC has a DC 400V and output voltage is a bigger than input rms voltage. But the SEPIC type converter has above 0.95 Power Factor and wanted output voltage. This paper employs the SEPIC(Single Ended Primary Inductance Converter) Converter for PFC and the Ring core for oscillating method. Consequently, We reduced element's size and capacity in a converter with minimum voltage for the operating lamp.