Pseudo Continuous Conduction Mode Operated Converter of Brushless DC Motor Drives


  • R. J. Venkatesh, A. Shunmugalatha


Brushless DC (BLDC) motors are becoming progressively acknowledged in many sectors and are advantageous in many aspects. But, they are in need of sophisticated and precise control schemes to run efficiently. Regulating the DC-link voltage of the BLDC motor is the simplest and powerful control scheme. The existing methods use a single switch topology which has reduced PFC capabilities. A Pseudo Continuous Conduction Mode Operated Converter for the control of the BLDC motor has been proposed. The two-switch tri-state buck–boost converter operating in Pseudo-Continuous conduction mode (PCCM) provides extra control flexibility. The PCCM Power factor correction (PFC) converter ensures fewer torque ripples and better power factor when compared with the conventional single switch converter and the proposed PFC converter operating in Discontinuous Conduction Mode (DCM). The operation of PCCM PFC converter, generation of PWM signals and justifications for the selected converter have been discussed. The conventional and simulated proposed topologies and its results have been verified with hardware model implementation.