Two-Capacitor Transformer Winding Capacitance Models for Common-Mode EMI Noise Analysis in Isolated DC–DC Converters

• Published in: IEEE transactions on power electronics Vol. 32; no. 11; pp. 8458 - 8469
• Main Authors: Zhang, Huan, Wang, Shuo, Li, Yiming, Wang, Qinghai, Fu, Dianbo
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Analytical models; Capacitance; Capacitors; Common mode (CM); Computer simulation; DC-DC power converters; Electromagnetic interference; isolated power converters; Measurement techniques; Parasitic capacitance; Power converters; Topology; transformer winding capacitance model; Transformers; Winding; Windings
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2017.2650952

For isolated dc-dc power converters, the interwinding parasitic capacitance of the transformer is usually one of the main paths for common-mode (CM) noise. In order to simplify the CM noise analysis, this paper proposes a two-capacitor transformer winding capacitance model. The model is derived based on general conditions so it can be applied to different isolated converter topologies. A measurement technique is also proposed to obtain the lumped capacitance for the model. The CM noise models of several isolated converter topologies are analyzed with the proposed two-capacitor transformer winding capacitance model to achieve simplicity. Finally, the proposed transformer winding capacitance model and measurement technique are verified by simulations and experiments.