Wide transient response digital control DC-DC converter

This paper presents the digital control method for the wide transient range dc-dc converter. We have already reported that an exponential function model is effective in improvement of transient characteristic. There is a problem that calculation time is long by using the exponential function and the square root. In this paper, those functions are approximated in order to achieve the calculation time reduction. The exponential function is linearized and the square root is approximated by Newton´s method. By these approximations, the calculation time is improved by 17.6% compared with existing proposed method. In addition, good transient characteristics as well as the existing proposed method is obtained. Therefore, the proposed method can satisfied with the high performance and low cost computing digital control circuit for dc-dc converter. Also, it is expected that this method is used with which has a cheaper DSP with a low operation performance to be cost reduction.