Improved characteristics of dc-dc converter with digital variable gain switchover function

The purpose of this paper is to present a new dc-dc converter with the digital variable gain switchover function and its improved characteristics. This proposed method changes the integral coefficient K
_I
. The integral coefficient K
_I
changes for the continuous current mode and discontinuous current mode. The reactor current is detected using two high-speed A-D converters. Then the valley reactor current is calculated. Based on the valley reactor current, the average value of reactor current is calculated. The integral coefficient K
_I
is changed to appropriate value using the calculate result. Then it is confirmed that the regulation characteristics is improved. Additionally, this paper discusses the transient response of the proposed method. As a result, the transient response of proposed method shows more excellent results than the conventional P-I-D method and the two stage integral coefficient switchover function method.