Article

Modified Synchronous-Buck Converter for a Dimmable HID Electronic Ballast

Dept. of Electr. & Comput. Eng., Cleveland State Univ., Cleveland, OH, USA
IEEE Transactions on Industrial Electronics (Impact Factor: 6.5). 05/2012; DOI: 10.1109/TIE.2011.2141094
Source: IEEE Xplore

ABSTRACT In this paper, a simple and effective way of increasing the efficiency of a three-stage low-frequency dimmable high-intensity-discharge (HID) electronic ballast is proposed. To increase the efficiency at all dimming levels, a modified synchronous-buck converter operating in a new critical conduction mode is presented. The proposed modified topology of the synchronous-buck converter operates in a soft-switching mode and therefore significantly increases the efficiency of the three-stage low-frequency HID electronic ballast at all dimming levels. Analytical and experimental results for a dimmable 400-W HID lamp are presented.

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