Discrete Modelling of Peak and Valley Current Control

Peak and valley current control (PVCC), is a current mode control (CMC) technique that employs double inductor current comparisons to control both the peak and the valley of the inductor current. PVCC requires two compensation ramps in order to modulate the switching of the converter while avoiding sub-harmonic oscillations. This control scheme allows reaching current loop bandwidths that far exceed half the switching frequency of the converter, while also achieving higher bandwidths than classical current control methods at a given phase margin. The present paper focus in an in-depth analysis and discrete modelling of a PVCC control scheme for a buck type converter. Experimental results that demonstrate the PVCC capabilities are also presented and discussed.