Stability analysis of digital feedback gain changeable control switching power converter

The dc power feeding system has been attracted attention in recent years. Since the load is dynamically changed in this system, the stability of dc-dc converter is important. This paper presents the stability analysis and the transient response of digital integral gain changeable control dc-dc converter using small output capacitance. The proposed method changes the integral gain with a single logarithm function according to the load current. It is verified the proposed method can obtain a good transient response with high stability even when the output capacitance is small.