Modeling and Design Considerations of a Novel High-Gain Peak Current Control Scheme to Achieve Adaptive Voltage Positioning (AVP) for DC Power Converters

Abstract

Peak current control (PCC) can be used to achieve adaptive voltage positioning (AVP) in DC power converters for CPU power applications. However, PCC is seldom used because of the problem with output voltage offset from the target load line. A novel high-gain PCC (HGPCC) AVP scheme was recently reported to correct the aforementioned offset problem while retaining the advantages of PCC, such as easy phase-current balancing, inherently cycle-to-cycle protection, and good stability margin. Without an analytical model, however, it is very hard to achieve prescribed characteristics using this complicated scheme. In this paper, a control model and design considerations will be presented for this scheme. Key equations for converter feedback performance and rules for compensating the feedback loop will be presented. The proposed model was experimentally verified.