新型功率放大器时变滑模控制方案研究

该文针对一种新型双向Buck逆变器提出了基于时变滑模面的滑模控制策略。该逆变器采用了两组独立对称的双向Buck电路，结合滑模控制策略，实现高性能的交直流信号功率放大。该文给出了电路的工作原理，对时变滑模面方程进行数学建模分析，研究了线性时不变和时变滑模面的动态特性、滑模区域存在条件和稳定条件，并对产生正弦波信号的时变滑模控制系统进行了深入分析。滑模控制方案能有效克服系统参变量变化和外部扰动，充分发挥了快速响应和鲁棒性强的优点。功率放大器可以实现交流信号的准确跟踪和放大，输出频率范围可达1000赫兹。通过1千瓦的实验得出结果，证明了分析设计的正确性。

TIME-DEPENDENT SLIDING SURFACE FOR NOVEL AC POWER AMPLIFIER

Sliding mode control strategy on time-dependent sliding surface for novel DC/AC Buck inverter is proposed in this paper. The inverter is composed of two independent current bi-directional Buck converters with sliding mode control, and achieves high-performance DC and AC signal power amplification. Mathematical modeling for time- dependent sliding surface is established and studied. Dynamics, the existence and stability of the sliding mode on both time-independent and time-dependent surfaces are analyzed. Time-dependent sliding mode control when converter output tracks and amplifies sine wave, is particularly discussed. The SMC inverter is robust with respect to both external disturbances and variations on the load and input voltage. And the power amplifier can realize accurately tracking and amplification for AC signals with frequency range up to 1000Hz. Experimental results from a 1kW prototype are included to verify the conclusion in the paper.