Digital Time-Varying Current Observer and Feedback Control for Multiphase Low-Voltage High-Current Voltage Regulator Modules

摘要

With the development of the DSP technology, it comes the digital controller for multiphase low-voltage high-current VRMs for powering Pentium series microprocessors. In this paper, a digital controller is presented to fulfill a voltage hysteretic control with multiphase current sharing. Due to the time varying of the load resistance, adaptive current observer with parameter estimation is designed to obtain phase current and realize senseless current sharing.