MATLAB GUI Based Steady State Open-Loop and Closed-Loop Simulation Tools for Different LLC Converters With all Operation Modes

LLC resonant converters have been widely adopted in many different industrial applications due to their characteristics of high efficiency and high power density. Simulation tools are of great importance for the analysis and design of LLC resonant converters. For example, many LLC design methods require massive simulations to finalize the circuit parameters, iterations are necessary, which can be tedious and time-consuming. Therefore, in this work, accurate and complete steady state simulation tools based on MATLAB graphical user interface (GUI) are designed for LLC resonant converters. All common and possible operation modes and LLC converter topologies are included in the designed simulation tools, which makes them practical for different applications and operation conditions. An improved mode judgement method and guidelines for initial point setting are proposed to ensure fast simulation speed. More than that, the key circuit voltage and current values are summarized for the user to evaluate the converter performance, which is more convenient than commercial simulation software. Moreover, the designed simulation tools are suitable and convenient for automatic converter parameter design.