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In this paper, three modeling techniques that are conventionally used in the derivation of mathematical models for switch-mode DC-DC converters are presented and studied. The state-models obtained by applying these general-case approaches are valid under both continuous and discontinuous operating modes. The first two methods use averaging process and allow only a low-frequency representation of the converter, whereas the third one, which is based on the using of the switching function concept, gives a mathematical model that is valid in the entire frequency range and has thus more accuracy in computer implementations. For illustration purpose, and in order to show the extendibility of all three modeling approaches to other families of switch-mode converters, a boost-type single-phase full-bridge rectifier is considered. The most-general switching-function-based model is highly suitable for real-time simulations.