Boost-LCL型谐振变换器的TDSA仿真建模及控制

提出了一种Boost-LCL型谐振变换器的新型补偿控制器设计方法。利用SABER仿真软件中时域系统分析器(TDSA)模块,对变换器仿真主电路进行控制量的扫频扰动信号注入,并实时分析与记录被控制量输出电压的动态响应情况,形成被控制量与控制量之间的响应特性曲线。通过SABER-MATLAB数据互联,进行曲线拟合,从而建立主电路仿真建模的开环传递函数,依据零极点稳定性分析,指导补偿控制器的设计。同时采用数字控制方式,对控制信号进行筛选分流,实现模式间无缝切换。为验证所提方法的有效性与可靠性,设计满载、中载及轻载3种功率等级负载自由切换的实验样机。实验结果表明所提出的Boost-LCL型谐振变换器在进行多模式切换时,可实现电压稳定。

TDSA simulation modeling and control of Boost-LCL resonant converter

A novel design method of compensation controller for Boost-LCL resonant converter is proposed. Using TDSA(Time Domain System Analyzer) module in SABER simulation software, the sweeping disturbance signal is injected into the control variable of the simulation main circuit of the converter, and the output voltage dynamic response of the controlled variable is analyzed and recorded in real time to form the response characteristic curve between the control variable and the controlled variable. Through SABER-MATLAB data interconnection, curve fitting is carried out to establish the open loop transfer function of the main circuit simulation modeling, and the design of the compensation controller is guided according to the stability analysis of the zero-pole. At the same time, the digital control method is adopted for control signal screening and shunting to achieve seamless switching among modes. In order to verify the effectiveness and practicality of the proposed method, the experimental prototype of three power level loads with full load, medium load and light load is designed. The experimental results show that the proposed Boost-LCL resonant converter can achieve voltage stability in multi-mode switching.