Current Ripple Cancellation for Asymmetric Multiphase Interleaved DC-DC Switching Converters
paper ID: 35
Abstract
Multiphase dc-dc converters are widely used in power electronics as they enable the processing of high power by splitting the load current into multiple phases. Conventional multiphase circuits are supplied by a common source and the goal is to distribute the processed power evenly between the phases. Ripple cancellation can then be performed by shifting the switching operations of each phase by angles of even distance. However, in recent applications such as maximum power point (MPP) tracking for solar photovoltaic (PV), multiple converters are supplied by sources that are often restricted to operate at different voltages and currents, leading to asymmetric converter operation. To achieve improved ripple cancellation under these conditions, phase shifting by uneven phase-angles is required. In this work, analytic formulas to obtain suitable angles for phase-shifting are derived. Simulations are used to evaluate the performance of the proposed technique, and a practical example implementation with three dc-dc buck converters is presented.
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