This paper explains a design a control scheme for Brushless DC motor for domestic applications using ZSI. This drive uses four switches which reduces the cost of the drive. Here the ZSI is used for both inversion and boosting. This utilizes the inductors and capacitors and the shoot through states by gating on both the upper and lower switches in the same phase legs, to boost dc voltage without dc/dc converter. The inductors and capacitors can be optimally designed to lower the cost and size of the system. Since the Z-source inverter does not need dc-dc converter to boost voltage it can gain 2-3% in conversion efficiency. Because of no dead time, control accuracy and reduction in harmonics can be achieved.

Keywords Brushless DC motor (BLDC), converters, Z-source inverter, pulse width modulation, motion control.