• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.5
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• pp.904-911
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• 2010

This paper presents the design of acoustic resonance free and over current limit during transient state consideration electronic ballast for 1.5kW Metal-Halide Lamp(MHL) that employs frequency modulation (FM) technique. The proposed ballast consists of a Full-Bridge(FB) rectifier, a passive power factor correction (PFC) circuit, a full-bridge inverter, an ignitor using LC resonance and a control circuit for frequency modulation. The frequency modulation technique is the most effective solution to eliminate acoustic resonance among other technique. It spreads power spectrum of lamp to reduce the supplied power spectrum under the energy level of eigen-value frequency. Moreover, the proposed ballast is simple and cost effective above conventional ballast. A new PFC circuit is proposed which combines with LCD type and PCSR filter. A new PFC circuit has higher PF and lower THD than conventional LCD type and secure high reliability. Finally, to protected switching components in transient state, the surge current into ballast is limited by increase the switching frequency. Performance of the proposed ballast was validated through computer simulation using Pspice, experimentation and by applying it to an electronic ballast for a prototype 1.5kW MHL.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3129-3131
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• 1999

The electronic ballast for MHD lamp was studied for automotive headlight application. Its basic principle is the Current Sourcing Push-Pull Resonant Inverter with DC I2Volt input Voltage. By changing the switching frequency according to the lamp state, the automotive requirement of very fast warm-up and the zero voltage switching condition were shown by the simulation of the ballast circuit.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.2
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• pp.1-8
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• 2002

The electronic ballast have much more shaking of arc than magnetic ballast because of acoustic resonance phenomenon. but it has used mare than before. In this paper, we made metal halide lamp modeling by modifying modeling of mercury lamp. To avoid acoustic resonance phenomenon, We calculated acoustic resonance frequency band. We proposed design of LCC circuit. Also, electronic ballast simulator for metal halide lamp was developed by simulink LCC parameters of inverter was decided on the basis of simulation results. After development of prototype ballast, it was verified the characteristics of simulator.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.4
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• pp.108-112
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• 2017

High-intensity-discharge lamps are widely utilized in outdoor and indoor lighting circumstances that need high luminance. In lighting applications for MHD lamps, the size of the lamp ballast circuit is an important factor and should be as small as possible. The electronic ballast for MHD lamps is superior to the electromagnetic(EM) ballast in that it saves energy, and has smaller volume and lighter weight. In this paper, highly efficient cost-effective and small sized electronic ballast for Metal Halide Lamp with high power factor using Digital Signal Processor are proposed. The proposed electronic ballast for MHD lamps combines a boost PFC converter with a half-bridge inverter, the algorithms of the power factor correction and ballast control were implemented using the TI's TMS320LF2406 CPU. Experimental results validate the ballast is also useful and reasonably suggested.

• The Transactions of the Korean Institute of Power Electronics
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• v.6 no.5
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• pp.438-445
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• 2001

This paper presents a high frequency modulation electronic ballast for the metal halide lamp. As the proposed ballast operates in high frequency ranges and can start up the lamp using the LC resonant circuit without external igniter, the proposed ballast is very compact and has a good efficiency in comparison with the conventional low frequency electronic ballast. The proposed ballast is controlled with the modulated frequency in the range of 20kHz to 100kHz in order to avoid the acoustic resonance phenomenon. In this paper, a new realtime acoustic resonance detection method is proposed to evaluate the characteristics of the ballast. The no load protection algorithm and power control algorithm through the detection of the DC link current are described. Finally, the experimental results on the proto-type ballast of 150w metal halide lamp with the proposed methods are discussed.

• Proceedings of the KIEE Conference
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• 2003.11c
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• pp.871-874
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• 2003

The T-5 Lamps developed in 1996 is the high efficiency fluorescent lamps, the lamps voltage is high, and the lamps current small because the lamps are slender tube of 16mm diameter. And so, the electrical characteristics of the Ballast for the lamps are different from of the Ballast for T-10 or T-8 lamps. Therefore, the know-how of the exclusive Ballast for the T-5 fluorescent lamps should be as soon as possible. We described the electrical and optical characteristics of the Electronic Ballast for T-5 Circular Fluorescent lamps. The developed Electronic dimming Ballast for T-5 Circular Fluorescent lamps has the 45% energy saving effects than the T-10 lamps. And it has the promotion of the THD less than 10%, CF less than 1.5%, Flickering less than 5% and 99% power factor. And it is available for two T-5 Circular fluorescent Lamps dimming, 22W and 40W.

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2931-2934
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• 2003

This paper has been studied the electronic ballast by the self-oscillated inverter. The self-oscillated ballast can reduce the stress of the switch of the inverter. But the self-oscillating method is not easy to analyze and design. There arc three kinds of cores for the oscillating transformer： Ring core, EI-core, and Drum core. In this paper, we are studied the characteristics of three kinds of cores in using electronic ballast by the self-oscillated inverter.

• Proceedings of the KIEE Conference
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• 1997.07f
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• pp.2255-2258
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• 1997

We have develped the electronic ballast for 32watt/1 fluorescent lamp. in this research. the circuit is analyzed by the P-spice program and designed to match the ballast with the fluresecnt lamp characteristics. The power factor correction circuit has been designed with all passive elements and then achived the slim-line type ballast.

• Journal of Electrical Engineering and Technology
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• v.2 no.3
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• pp.373-378
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• 2007

Soft switching was applied to the multi-level inverter to enhance the performance of the high-intensity discharge (HID) ballast used in vehicle headlights. The electrical properties were investigated and the available modeling of ballast in steady state was calculated using mathematical methods. The result was used in analyzing the power characteristics. The modeling was confirmed by the experiment.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2001.11a
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• pp.109-113
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• 2001

A high-efficiency electronic ballast for HID lamps is presented. The ballast consists of a PFC and a resonant inverter. To reduce losses of ballast,7C link voltage is determined by taking into account the peak voltage of lamp and a filter-inductor at Bridge diode is employed in order to remove harmonics from PFC. The flux density B$_{m}$ is kept 0.2[T] on all of inductors. A small inductor is connected in series with an electrolytic capacitor of PFC to be operated no high-frequency components. The acoustic resonance is eliminated using the spread spectrum technique. Electronic ballast for 250W metal-halide lamp is implemented and the experimental results show that 97% efficiency, no acoustic resonance and low conducted EMI level.l.