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Stability analysis in multiple loop systems

Posted: 12 Nov 2008 ?? ?Print Version ?Bookmark and Share

Keywords:analysis stability? multiple loop system? flyback converter? application note?

Loop stability analysis usually starts from an open-loop Bode plot of the plant under study, e.g. the power stage of a buck or a flyback converter. From this diagram, the designer can extract phase and gain data within the frequency range of interest. His job then consists in identifying a compensator structure which will lead to the selected crossover frequency affected by the right phase margin. The final step requires the study of the total loop gain, the power plant followed by the compensator, showing that the poles/zeros placed on the compensator ensure stability once the loop is closed. If this operation is rather straightforward with single loops, the operation become more complicated with converters implementing weighted feedback. This paper capitalizes on the Ref. work and explores different ways to apply the technique to power converters featuring multiple feedback paths.

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