Performance Improvement of BLDC Motor Based on Quasi-Z Source Network

Quasi Z Source network is one of the Z source inverter topologies, Basically it is the combination of Four switch three phase configuration and boost circuit.This paper presents Four switch configuration which has several advantages compared to Six switch three phase configuration, Four switch three phase configuration there by overcoming the limitations of Z source network. A novel Four switch three phase BLDC motor control scheme based on Quasi Z source network improves the utility ratio of DC voltage and extends the range of speed. During the operation of the motor, shoot through states are inserted then the input voltage of the inverter increases and performance of the motor is markedly improved. The proposed method uses Level shifted PWM technique and reduces the distortion in phase currents there by improving the speed of the motor. The controlling method for existing model and proposed model is studied in detail and constructed in Matlab/simulink environment.