基于滑模控制的Buck-Boost型AC-DC变换器

Single-Phase Buck-Boost Type AC-DC Converter with Sliding-Mode Control of the Input Source Current

提出了一种基于滑模控制的Buck Boost型AC DC变换器。相对于现行的双环结构控制方式 ,滑模控制没有增加控制电路的复杂性 ,而且能得到近似为 1的输入功率因数 ,电路效率高。同时分别提出了针对输出直流电压以及输入交流电流的控制策略。对输入电流采用滑模控制以获取高功率因素 ,对输出电压 ,因其动态响应相对较慢 ,采用PI控制器调节。最后给出了仿真及实验结果 ,表明该电路具有高效率。

A pulse width rectifier referred to as a single phase buck boost type AC DC converter is presented and discussed.To achieve sinusoidal input current and high power factor,sliding mode control of the input current is proposed.A Proportional Integral (PI) controller is adopted to regulate the output voltage of the converter.The reference of the current controller is a sinusoidal waveform which amplitude is modulated by the external voltage controller.Simulation and experimental results show the high power factor and low harmonic distortion characteristics of the circuit.