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Modeling and Current Balancing of Interleaved Buck Converter Using Single Current Sensor

In this paper, the state-space (SS) representation and transfer function (TF) of a two-phase interleaved buck converter, by defining two new control parameters and considering the inductors equivalent series resistance (ESR), are derived. The definition of two new control parameters results in two decoupled voltage regulation and current balancing control loops. Furthermore, a current measuring algorithm, using a single current sensor is presented to measure both phases current. The simulation tests in different cases have verified the effectiveness of the proposed voltage regulation method, current balancing controller, and the current measuring algorithm.