Analysis of Non-minimum Phase in Buck-Boost Converter
1 Xi’an University of Science & Technology, 710054 Xi’an, China
2 Shaanxi University of Technology, 723000 Hanzhong, China
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In this paper, relations among the parameters of the non-minimum phase for the Buck-Boost converter are studied. It is demonstrated that when the Buck-Boost converter works in Buck mode, the negative regulation voltage is determined by the converter with the pre-designed inductor and load as the duty ratio D<0.382, as well as what is determined jointly by the converter with its pre-designed inductor, load and duty cycle as the duty ratio D>0.382, and the duty ratio has a limited effect on the negative regulation voltage of the converter; when the Buck-Boost converter works in Boost mode，the negative regulation voltage is determined jointly by the converter with its pre-designed inductor, load and duty cycle, for which performs that the higher the output voltage is (i.e., the greater the duty ratio is)，the more severe undershoot of the voltage will be. The conclusion of this paper has a guidance meaning for decreasing the negative regulation voltage of the Buck-Boost converter. Finally the correctness of the analysis for the non-minimum phase is verified by simulations and experiments.
© Owned by the authors, published by EDP Sciences, 2016
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