A digital PFC (DPFC) control approach that requires no input voltage sensing or current loop compensation is described. The approach can provide stable, low-harmonic operation over a universal input voltage range and load ranging from high-load operation in continuous conduction mode down to near-zero load. A fast voltage loop can also be incorporated into a DPFC controller to provide additional control of the power stage. A controller can be based on low-resolution DPWM and A/D converters, can be implemented without microcontroller or DSP programming, and is well suited for simple, low-cost integrated-circuit realizations.