Modeling and design for a Novel Adaptive Voltage Positioning (AVP) Scheme for Multiphase VRMs
Journal
IEEE Transactions on Power Electronics
Journal Volume
23
Journal Issue
4
Pages
1733-1742
Date Issued
2008-07
Author(s)
Abstract
Adaptive voltage positioning (AVP) has been used in multiphase voltage regulator module (VRM) applications. A novel scheme, called AVP+, is analyzed in this paper. Small signal model is used to look into the control performance issues such as output impedance and stability. The model has been verified in the experiments and simulations. Compared to a conventional AVP schemes, the present scheme provides better stability margin and output-impedance performance. This is especially true for the prevailing trend of using ceramic output capacitors and high switching frequency. The focus of the present paper is the small-signal modeling for control loop design using the AVP+ scheme which was never analyzed before. And the comparisons were made between AVP+ and AVP- on the stability and output impedance performance. © 2008 IEEE.
Subjects
Adaptive voltage positioning (AVP)+ control; Constant output impedance; Stability; Voltage regulator
Other Subjects
Ceramic capacitors; Electric converters; Electric potential; Energy storage; Voltage regulators; Adaptive voltage positioning (AVP); Control performances; Multiphase voltage; Output impedance; Small-signal modeling; Stability margins; System stability
Type
journal article