A Switched Capacitor Based BLDC Drive

The high power density and high torque to inertia ratio widespread the demand for BLDC motor drive. But the low inductance nature and square wave mode operation give rise to torque oscillations. This paper presents an analysis of a switched capacitor based DC-DC converter for BLDC drive for suppressing the undesirable ripples in instantaneous torque. The converter topology implemented is comparatively superior to other converters in terms of voltage gain, current stress, and also passive devices store less energy which consequently reduces the size requirement and makes it cost-effective. The commutation instances are mapped from hall sensors to control the DC bus voltage by DC-DC converter to enhance the current wave-shape to attain smooth torque. Simulation results are presented in this work to validate. The experimental validation is in progress.