Abstract
In this paper, a bridgeless buck-boost converter is used for power factor correction (PFC) of low voltage high current (LVHC) multi-string light emitting diode (LED) driver. This is a design for an application in large area LED lighting with illumination modulation. A multi-mode LED dimming technique is used for lighting control. The BL buck-boost PFC converter feeds power to isolated flyback DC-DC converter. The regulated low voltage from a flyback converter is a source power to the synchronous buck converters for multi-string LED driver and forced cooling system for LED junction. The design of the inductor of BL-buck-boost PFC converter is based on discontinuous inductor current mode (DICM), which provides good PFC at low cost. A prototype is designed and tested for a LED driver. The performance of proposed HB LED driver is evaluated for a full brightness control capability. The measured harmonic parameters are found lower than range set for lighting by IEC 61000-3-2 Class C.
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