Current Sharing and Sensing in N-Paralleled Converters Using Single Current Sensor

Current sensing is one of the important functions in a DC-DC converter. It may be used for over-current protection, current control or for load sharing among paralleled converters. Current sharing can be achieved by sensing the output currents of individual converters, but it requires N-current sensors. In this paper, a current sensing and sharing scheme is presented which uses single sensor to sense the individual currents. The scheme is independent of the number of converters in the paralleled system. The proposed scheme can be implemented easily on a digital platform and provides various functionalities of a voltage regulating module. Analysis and implementation issues for such a scheme are presented and experimentally verified on a 1 V/25 A 2-phase interleaved buck converter with digital control.