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H loop-shaping control schemes for the buck converter and their evaluation using μ-analysis

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

Two H loop-shaping control schemes for the buck converter are presented and compared to the existing linear quadratic scheme. The first control scheme is the H loop-shaping controller, and the second scheme is the current-assisted H loop-shaping. The evaluation of the proposed controllers is performed in terms of robust stability, control circuit complexity and robust performance of the converter. The powerful tool of μ-analysis is applied to examine the robust features of the buck converter, which employs any of the control schemes. It is shown that the current-assisted H loop-shaping control scheme exhibits better performance than the other two control schemes. This conclusion is verified by simulated and experimental results

Published in:

IEE Proceedings - Electric Power Applications  (Volume:146 ,  Issue: 2 )