A Digital PFC Controller without Input Voltage Sensing

This paper introduces a novel digital PFC (DPFC) control approach that requires no input voltage sensing or current loop compensation, yet results in low-harmonic operation over a universal input voltage range and loads ranging from high-power operation in continuous conduction mode down to near-zero load. The controller is based on low-resolution DPWM and A/D converters, requires no microcontroller or DSP programming, and is well suited for a simple, low-cost integrated-circuit realization, or as an HDL core suitable for integration with other power control functions. Experimental verification results are shown for a 500 W boost PFC rectifier.