Adaptive switching frequency in delta modulation inverter for single phase induction motor drives

This paper proposes a new technique for generating control signal pattern to driving a single phase induction motor by mean of improving the switching frequency of inverter employed delta pulse width modulation control. The technique can be used to solving problem due to unstable switching frequency and harmonics when applying the normal delta-modulation technique, and also, having simple circuit structure. Results from implementations shown that such technique could provide the switching frequency stable and reduce accumulated harmonic of current and voltage, in addition, the voltage could be controlled through the modulation parameter resulting to decrement of lower order harmonic. Experiments results were compared to ordinary technique for verification