Construction and Application of Macro Model for ZVS Resonant Mode Controller MC34067

To solve the low efficiency issue in cyber-simulation for high frequency resonant converters in power electronic system integration, improve the speed of the simulation for the resonant mode controller and make the design process for high frequency switching power supply to be more efficient, proposed the construction process of the macro model for ZVS resonant mode controller MC34067 followed by the analysis for the internal structure and main characteristics. This macro model maintained the main functions of MC34067 while some simplification was made to suit for simulation. Based on the macro model, A 250~400V input, 54V/300W output LLC resonant mode converter was designed and simulated. Whereafter a prototype with the same circuit electrical parameters was made to verify the authenticity and validity of this macro model. The experimental results show the proposed macro model can truly imitate the external characteristics of MC34067 while maintains highly precision as well. Therefore the proposed macro model is attractive for the power electronic system integration applications, where the high frequency is intensively required, to improve the efficiency of the design process for the high frequency resonant power supply.