A DSP-based variable AC power source

This paper presents the development of a single-phase ac power source. The power source described in this paper is capable of providing a stable ac vo ltage with variable amplitude and variable frequency over a wide range. Mor eover, it can generate various high-quality low-frequency arbitrary wavefor ms, This is achieved by applying advanced digital control techniques to per form closed-loop control of the single-phase inverter used in the circuit. In this system, a high-performance digital signal processor has been used t o realize the discrete-time sliding-mode control strategy. This leads to a system that is robust with respect to system parameter variations and exter nal disturbances. Consequently, high-quality output waveforms can be mainta ined despite dynamic loading conditions, Some experimental results are demo nstrated.