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Application of sliding mode control to the direct tracking of an arbitrary output voltage profile in multiple modular DC-to-DC boost power converters is studied. In particular, the case of two boost converters sharing a common primary source of electric supply (PSES) and driving independent loads is studied to demonstrate tracking control of multiple modular converters. Operating point analysis shows that the coupled converters have two possible operating points, which result in nonminimum phase operation. It is demonstrated that one of these operating points results in a practical and physically realizable solution while the other does not. Sliding mode control by the method of stable system center is employed, and the nonminimum phase output tracking problem is reduced to a state-tracking problem. A numerical example and simulation demonstrates the effectiveness of the sliding mode control design.