Modeling and mitigation of dynamic load beat-frequency oscillation in multiphase voltage regulators with high-gain peak current control scheme

High-frequency dynamic load may cause phase current oscillation in multiphase interleaved voltage regulators. A model is presented in this paper to investigate this phenomenon in the recently reported high-gain peak current control (HGPCC) voltage regulators. Based on the analysis, it is concluded that HGPCC scheme suffers from beat-frequency oscillation problems, similarly to conventional peak current control scheme. A modified HGPCC scheme is then proposed and verified to mitigate this problem. A comparison of the three schemes will be made from the viewpoint of beat-frequency oscillation.