Modified bridgeless landsman PFC converter for LED driver

This paper presents a modified bridgeless Landsman converter-fed power factor correction (PFC) for light emitting diode (LED) driver. The application is targeted for high brightness (HB) projection applications with brightness control of high brightness red-green-blue (HB-RGB) LEDs. The pulse width modulation (PWM) technique is used for current control to achieve effective brightness control of LED driver without compromising the efficiency. The modified BL- Landsman PFC converter is used to feed a dual flyback DC-DC converter which supplies power to the forced LED cooling unit and the LED lighting module with a galvanic isolation. The brightness control of LED is performed by synchronous-buck converter with current modulation. The proposed PFC based modified BL- Landsman converter design is based on discontinuous conduction mode of output inductor current for high power factor (PF). A hardware prototype of the LED driver is verified experimentally. The proposed LED driver performance evaluation at full and light load conditions is good for universal AC mains (90V-265V). The power quality parameters measured with calibrated instruments are within the acceptable limits of standard IEC 61000-3-2 Class C for lighting systems.