Modeling and Application of PFC Chip L4981A

为了在电源开发设计过程中利用PSIM仿真软件提高电源设计效率，本文基于L4981A的工作原理与特性，建立了PSIM库中欠缺的L4981A的仿真模型。利用该模型对意法半导体的AN827应用手册的APFC电路进行仿真，并参照手册参数与模型的静态特性进行对比，仿真结果与手册参数一致。结论表明该模型可以用于模拟实际电路的运行，对电源的分析与设计具有很好的参考价值，也为其他控制芯片的仿真建模提供了有效的分析手段与实现方法。In order to improve the efficiency of power supply design using PSIM simulation software in power supply design process, combining with the working principle and characteristics of L4981A, a L4981A simulation model is established which is the lack of PSIM Library. An APFC circuit in ST AN827 application note is used to simulate and verify the model of L4981A. Compared with its application note, it is found that the static characteristics of modeling match well with the application note. Results show that the model can describe the operating characteristic of actual circuit. The model has a very good reference value in analysis and design of power equipment. The idea provides an effective analysis and implementation method for other control chips.