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http://dx.doi.org/10.6113/JPE.2010.10.6.777

A Protection Circuit for the Power Supply of a Gas Discharge Lamp  

Kim, Ho-Sung (Dept. of Electrical and Electronics Eng., Pusan National University)
Kim, Jong-Hyun (Power Conversion & System for Renewable Energy Research Center, KERI)
Baek, Ju-Won (Power Conversion & System for Renewable Energy Research Center, KERI)
Yoo, Dong-Wook (Power Conversion & System for Renewable Energy Research Center, KERI)
Jung, Hye-Man (AIRTEC SYSTEM CO., Technical R&D Center)
Kim, Hee-Je (Dept. of Electrical and Electronics Eng., Pusan National University)
Publication Information
Journal of Power Electronics / v.10, no.6, 2010 , pp. 777-783 More about this Journal
Abstract
In order to drive gas discharge lamps, DC-AC converters with a LCC resonant tank, whose output voltage is adjusted by a variable frequency control are frequently used. However, when they are activated by varying the operating frequency, converters are frequently damaged by unstable operation, due to the rising and falling of the operating frequency near the resonant frequency. To solve this problem, a simple protection circuit for the power supply of a gas discharge lamp is proposed in this paper. This circuit senses the primary current of the main transformer. Using this protection circuit, the operating frequency of the lamp driving inverter system is kept close to and on the right side of the resonant frequency and the inverter is always operated in the ZVS condition. The resulting stable variable frequency operation allows various gas discharge lamps to be tested without the risk of damaging the main switches, because the protection circuit can protect the power MOSFETs of bridge converters from abnormal conditions. The validity and effectiveness of the proposed protection circuit are verified through the experimental results.
Keywords
Gas discharge lamp; LCC resonant converter; Protection circuit; Variable frequency control; ZVS operation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By Web Of Science : 0  (Related Records In Web of Science)
Times Cited By SCOPUS : 0
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