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In this paper, a quantitative feedback theory (QFT) was applied successfully to design a robust controller for a DC-DC buck converter operating in continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The controller is designed to provide optimum attenuation of the load disturbances in spite of practical limitations on the achievable(More)
Standard methods of system theory and control engineering are used to investigate the stability and performance of power units connected in series. The systems are first modelled in a normal multi-input multi-output form, and the dynamic properties are characterized in terms of poles and zeros. The series connection of such systems is shown to be of a(More)
In the paper it is investigated, under which conditions a time variable state transformation can be used to change a periodic autonomous system realization into a form with constant real coefficients. Conditions for the transformation to be periodic are further considered, and it is shown that the necessary and sufficient condition to meet the conditions is(More)
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