A digital compensation method for suppressing cross-regulation of single-inductor multiple-output dc-dc converter

Abstract

Aiming at the problems of high complexity and large calculation quantity in the existing digital control strategies for single-inductor dualoutput (SIDO) converter, this paper proposes a simple and reliable digital compensation control technology to suppress the cross-regulation. The design of the compensation control is only related to the selected circuit topology, thus it will not be redesigned for different control strategies. Taking the digital predictive current-mode (DPC) controlled SIDO buck converter as an example, the small signal model is firstly established. Based on these transfer functions, the theory of the proposed digital compensation method, which can suppress cross-regulation is analyzed. In the meanwhile, the digital control algorithm is derived. Simulation and experimental results verify the correctness of the theoretical analysis.