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Modified input-to-output and control-to-output transfer functions of a non-ideal buck converter working in discontinuous conduction mode

Walczak Marcin

Archives of Electrical Engineering

2024

Vol. 73, nr 4

1025--1045

Small-signal models of a buck converter working in the discontinuous conduction mode that are available in the literature usually can be divided into those which contain a single pole and refer to non-ideal converters and those that describe ideal converters and contain two poles. Even though the models are noticeably different they have been validated through simulations and measurements, which suggests both of them are correct. The purpose of this paper is to provide a comprehensive comparison of the existing models with transient simulations done in OrCAD software and through measurements, to show that both of the mentioned models are true for a specific set of converter parameters, and to propose a two-pole, control-to-output and input-to-output transfer functions of a non-ideal buck converter, that can be used in any buck converter working in discontinuous conduction mode.