Using input condition monitoring to improve the stability of digitally controlled power factor correcting converters

An adaptive controller for a PFC converter is proposed and demonstrated. This controller is applied to a converter with a boost topology operating in continuous conduction mode with average current control. The compensator adjusts a variable gain in the current loop so as to counteract the effects of the time-varying source impedance and input voltage. Experimental results verify that the proposed controller improves the stability of the interaction between the converter and a non-ideal source.