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; 59(4):1815 - 1824. DOI: 10.1109/TIE.2011.2141094
Source: IEEE Xplore


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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    • "In addition, digitally controlled circuits have the advantages of reliability, noise immunity, and flexibility [4]–[9]. They may also be simultaneously used for dimming [10]–[12] and communication systems [13]. Automotive HID electronic ballasts presenting digital analysis are shown in [14], [15]. "
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    ABSTRACT: High-intensity-discharge (HID) lamps are widely utilized in a variety of lighting circumstances that need high luminance. This paper proposes a single-stage electronic ballast for HID lamps; the ballast offers power factor correction and is acoustic resonance free. The presented HID lamp ballast integrates a discontinuous-conduction-mode (DCM)-operated bridgeless power factor correction (PFC) converter for shaping the input utility-line current with a high-frequency (36 kHz)/low-frequency (60 Hz) square-wave-driven half-bridge inverter for supplying low-frequency (60 Hz) square-wave sources to the HID lamp. The features of the proposed ballast are high power factor, low total harmonic distortion (THD) of the input current, cost effectiveness, and that it avoids acoustic resonance. The operational modes, key design guidelines, and a design example are included. A 70 W prototype HID lamp ballast circuit operating with 110 V-rms input utility-line voltage has been implemented and testified. The functionalities of the presented ballast are demonstrated by satisfactorily experimental results with a maximum efficiency of 90.8%, a maximum power factor of 0.998, and a minimum current THD of 11.13%.
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