CLLC型三电平双向DC/DC变换器混合控制策略

Hybrid Control Strategy of CLLC Three-level Bidirectional DC/DC Converter

CLLC型三电平双向DC/DC变换器采用变频移相混合控制策略。该控制策略结合变频控制与移相控制的优点,让变换器输出电压在宽泛范围内进行高效率的工作,且在不需要辅助电路下实现开关管和整流管的软开关。作者对CLLC型三电平双向DC/DC变换器变频、移相控制工作原理进行分析,分析软开关条件,计算工作区域,划分变频、移相工作范围,最后在MATLAB/Simulink平台上搭建仿真模型,仿真结果显示:输入电压范围宽,具有良好软开关特性。

The three-level bi-directional DC/DC converter of CLLC adopts the Hybrid Control Strategy of frequency conversion and phase shift in the study.The control strategy combines the advantages of frequency conversion control and phase shift control,so that the output voltage of the converter can work efficiently in a wide range,and the soft-switching of the switches and rectifiers can be realized without the need of auxiliary circuit.In this paper,the working principle of frequency conversion and phase shift control of three-level bi-directional DC/DC converter was analyzed,the soft-switching condition was studied,the working area was calculated,the working range of frequency conversion and phase shift was divided,and the simulation model was built on MATLAB/Simulink platform.The simulation results show that the input voltage has a wide range and good soft switching characteristics.