Self-Oscillating Full-Bridge Electronic Ballast with Constant-Lamp-Current Control and No-Lamp-Protection Circuit

• Main Authors: Jung-Pei Cheng, 鄭榮霈
• Other Authors: Ray-Lee Lin
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/35199585283241035306

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 95 === This thesis presents the self-oscillating full-bridge electronic ballast with constant-lamp-current control and no-lamp-protection circuit for use in fluorescent lamps. The proposed ballast resolves the two inherent issues related to the self-oscillating full-bridge electronic ballast. The first of these inherent problems is that the lamp current varies according to the input AC voltage to causes different levels of brightness of the lamp. Secondly, once the lamp load is removed or broken, the ballast continuously attempts to generate an abnormally excessive voltages and currents, which results in failure of the components in the ballast. Integrating the constant-lamp-current control and the proposed no-lamp-protection circuit into the self-oscillating full-bridge electronic ballast resolves the ballast’s issues of unstable brightness and failure of the components during no-lamp conditions. Finally, a 38W self-oscillating full-bridge electronic ballast with constant-lamp-current control and no-lamp-protection circuit for use in fluorescent lamps is designed and implemented to demonstrate the feasibility and performance of the proposed electronic ballast.