A Versatile Discrete-Time Approach for Modeling Switch-Mode Controllers

Lars Risbo, Mikkel Christian Wendelboe Høyerby, Michael Andreas E. Andersen

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This paper presents a universal method for modeling the frequency response of comparators in switchmode controllers. As the main non-linearity in most switchmode controllers, understanding the comparator is the key to understanding the system. Based on discrete-time modeling, the proposed method is demonstrated to allow very precise predictions of comparator frequency response in a variety of control schemes. In the presented work, the modeling method is exemplified for the standard PWM and two different self-oscillating (a.k.a. sliding mode) control schemes. The proposed method is believed by the authors to be the first method that is able to handle these fundamentally different control schemes within a single modeling framework. Experimentally measured output impedance and comparator magnitude responses are compared to the model results. Great accuracy is achieved from DC to frequencies far beyond the switching frequency.
Original languageEnglish
Title of host publication39th IEEE Annual Power Electronics Specialists Conference
Publication date2008
ISBN (Print)978-1-4244-1668-4
Publication statusPublished - 2008
Event39th IEEE Annual Power Electronics Specialists Conference - Rhodes, Greece
Duration: 15 Jun 200819 Jun 2008
Conference number: 39


Conference39th IEEE Annual Power Electronics Specialists Conference
Internet address

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