Noise source model for power converters incorporating a single source with imbalance

This paper proposes a noise source model for power converters consisting of a single source as well as impedances that model imbalance. The single source models Differential Mode (DM) noise, while the imbalance in the model the Common Mode (CM) noise. This is different from models where both the DM and CM sources are modeled independently. Such models rely on external black box observations and do not contribute to understanding the fundamentals of noise generation inside converters. Understanding how noise is generated inside the converter can aid designers to reduce conducted Electromagnetic Interference (EMI) at the source. This in turn will reduce filter size and cost, which is significant in modern day converters. Fundamentals of noise reduction in power converters are given with a boost converter as example. Reducing converter EMI at the source largely relies on balancing which is not perfect. The sensitivity of parameters which influences balancing is given.