Abstract
This paper presents a method for computer-aided operation and design optimization of resonant converters using time domain analysis. Resonant converters can operate in different operation stage trajectories (OSTs) with the change of two degrees of freedom (2DOFs), namely switching frequency <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">f<sub>s</sub></i> and duty ratio <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</i> . The paper calculates and analyzes the operation characteristics, zero voltage switching-on (ZVS-on), and zero current switching-off (ZCS-off) regions when the 2DOFs vary by solving the OST differential equation sets. Based on this analysis, an algorithm is proposed to find the operation and design optimizations of a specific resonant converter while considering 2DOFs by traversing all possible control coordinates. The paper provides several case studies to demonstrate the design trade-offs in different scenarios, which are verified through experimental verifications.
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