Abstract
This paper presents a modified-Landsman converter fed power factor correction (PFC) based light emitting diode (LED) driver. The application is targeted for high brightness (HB) projection application with brightness control of high brightness red-green-blue (HB-RGB) LED. A pulse width modulation (PWM) technique is used for current control to achieve brightness control of LED driver without compromising the efficiency. The modified-Landsman PFC converter is used to feed a dual output flyback DC-DC converter which supplies power to the forced cooling unit and the LED module with galvanic isolation. The brightness control of LED is performed by synchronous-buck converter. The PFC based modified-Landsman converter is designed to operate in discontinuous output inductor current mode for PFC at universal AC mains. A hardware prototype of the proposed LED driver is developed for experimental verification. The performance of the proposed driver is evaluated at full and light load condition for universal AC mains (90–265V) over a full range of brightness control. The power quality indices are found within the acceptable limits of international harmonic power quality standard IEC 61000-3-2 for universal AC mains.
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