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A Novel Constant Power Control Circuit for HID Electronic Ballast

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4 Author(s)
Huang, Chien-Ming ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan ; Tsorng-Juu Liang ; Ray-Lee Lin ; Jiann-Fuh Chen

This paper presents a constant power control circuit for a three-stage high intensity discharge (HID) electronic ballast. The three-stage electronic ballast is composed of a boost pre-regulator to achieve high power factor, a dc-dc buck converter to regulate lamp current with constant lamp power, and a full-bridge inverter to drive the HID lamp with a low frequency ac square wave current. The buck converter operating in current mode utilizes current sense level-shift technique to achieve constant power output. The proposed constant power control circuit is easily designed and implemented for the three-stage HID electronic ballast. Finally, a laboratory prototype of a 70-W HID electronic ballast is implemented. The measured results show that the proposed ballast can be applied for various HID lamps with low lamp power variation (less than 0.6%)

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Power Electronics, IEEE Transactions on  (Volume:22 ,  Issue: 3 )