Dynamic Characteristics of Integral Gain Changeable Digital Control DC-DC Converter for Suppression of Output Capacitance

Kazuhiro Kajiwara, Hidenobu Tajima, Hidenori Maruta, Fujio Kurokawa, Ilhami Colak

Abstract


Stability of power converters has become more and more important in the hybrid green energy system because of its difficulties to maintain a stable dc-bus. This paper presents dynamic characteristics of a digital integral gain changeable control dc-dc converter to realize the high stability with suppression of the output capacitance. The integral gain changeable control method uses a variable integral gain, which is changed by the value of load current. The stability analysis is conducted by Bode diagrams. It is shown that the transient response and stability of the integral gain changeable method are better than the conventional fixed integral gain control method even if the output capacitance is smaller than the conventional method. Simulation and experimental results show the effectiveness of our concept presented.

Keywords


dc-dc converter; digital control; integral gain; stability analysis; transient response; output capacitance

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DOI (PDF): https://doi.org/10.20508/ijrer.v6i1.3452.g6779

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