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Novel control design for the buck converter

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3 Author(s)
Ioannidis, G. ; Dept. of Electr. & Comput. Eng., Nat. Tech. Univ. of Athens, Greece ; Kandianis, A. ; Manias, S.N.

A novel control design approach for average current-mode controlled buck power converter is presented. The buck converter large-signal averaged model is shown to be easily large-signal linearisable. The linear model is then examined as a multivariable system with no inner and outer loops, using both the state-space and frequency domain descriptions. Transfer functions of the system are derived as a function of the desired closed-loop poles, simplifying the design procedure and bringing forward all the important characteristics of the closed-loop system. Several advantages can be gained by the use of capacitor current instead of inductor current feedback. Theoretical analysis is applied and confirmed with simulation and experimental results on a 250 W prototype. The proposed approach can be used with all small-signal linear models of DC-DC power converters, offering simplicity and a better insight on system characteristics

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Electric Power Applications, IEE Proceedings -  (Volume:145 ,  Issue: 1 )