Inductor current measurement system and method for DC to DC converters

The invention provides an inductor current measurement system and method for DC to DC converters. The system includes an averaging module, a high pass filter module, a first estimation module, a sensing module, and a combining module. The averaging module receives an output voltage of a power supply and that generates an average output voltage. The high pass filter module receives an average switching voltage used to control switches in an output stage of the power supply and filters a difference between the average output voltage and the average switching voltage. The estimation module estimates a first filtered current through an inductor in the output stage based on an output of the high pass filter module. The sensing module senses voltage across the inductor and estimates a second current through the inductor. The low pass filter module filters the second current. The combining module combines the first filtered current and the second filtered current to generate an estimated current through the inductor