ZVS谐振控制芯片MC34067的建模与应用

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

介绍了零电压开关(Zero Voltage Switching,简称ZVS)谐振模式控制芯片MC34067的内部组成和主要特性。根据仿真的要求,构建了MC34067主要功能模块的宏模型,并以该宏模型为核心对LLC ZVS谐振功率变换器进行了仿真,以验证其可行性。

To solve the low efficiency issue in computer-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, the construction process of the macro model for Zero Voltage Switching （ZVS） resonant mode controller MC34067 followed by the analysis for the internal structure and main characteristics is proposed.This macro model maintaines the main functions of MC34067 while some simplification is 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, and 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.