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Modeling Resonant Converter in a Rotating Coordinate
04/10/2017TYPE: PAPER - CONFERENCE
Authors: Hsieh, Yi-Hsun Eric; Lee, Fred C.
Source: 2017 CPES Conference, April 9-11, 2017, Blacksburg, VA
Publication Date: 4/11/2017
Copyright: © Copyright 2017 CPES. VPI&SU. All rights reserved. Permission is granted to CPES industry members to reproduce all or part of this material for their internal use only.
ABSTRACT
The difficulty of modeling a resonant converter is the fact that, unlike a pulse-width-modulation (PWM) converter, an average concept doesn't work. The only successful equivalent circuit model, proposed by E. Yang, is based on fundamental approximation and harmonic balance theory. However, it is conceptually hard to understand because of an unidentified "equilibrium state." On the other hand, electric machine theory has already tackled AC signals for decades. By a rotating coordinate transformation, or a dq-transformation, AC signals become DC signals. As a result, an equilibrium state is clearly defined and the modeling process is straightforward. Therefore, this paper present a new modeling methodology for resonant converter: rotating coordinate modeling. As a result, the modeling of resonant converters can be as easy as PWM converters. The simulation result shows the proposed model well predict both large-signal and small-signal behaviors of a series resonant converter.
