N-phase sensor-less current sharing digital controller

An N-phase sensorless current sharing digital controller algorithm and architecture for multiphase power converter is presented in this paper. It demonstrates the visibility of sensor-less current sharing implemented for buck converter with more than two- phases. The presented N-phase sensor-less current sharing controller eliminates the need for current sensing for the current sharing loops and the need for analog-to- digital converters for phase current sampling when digital controllers are used. The presented current sharing controller operation is discussed and verified with experimental results obtained from a four-phase proof of concept prototype.