This paper deals with the modeling of bond graph buck converter systems. The bond\ngraph formalism, which represents a heterogeneous formalism for physical modeling, is used to\ndesign a sub-model of a power MOSFET and PiN diode switchers. These bond graph models are\nbased on the device�s electrical elements. The application of these models to a bond graph buck\nconverter permit us to obtain an invariant causal structure when the switch devices change state.\nThis paper shows the usefulness of the bond graph device�s modeling to simulate an implicit bond\ngraph buck converter
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