Buck inverter with sliding mode control strategy

A new DC/AC switched mode power amplifier based on sliding mode control (SMC) is presented in this paper. The inverter is composed of two independent current bi-directional buck converters with sliding mode control, and achieves high-performance AC signal power amplification. The inverter topology is analyzed by small signal modeling with different operating conditions. And the existence and stability of the sliding mode controller is particularly discussed. The design of SMC parameters is also analyzed for stability, robustness and dynamic response. 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 1000 Hz. Experimental results from a 1 kW prototype are included to verify the conclusion in the paper.