A Single Sensor, Single Switch Integrated PFC Buck- Boost Buck Converter Fed BLDC Motor Drive

This paper presents an integrated power factor correction (PFC) buck-boost buck converter based voltage source inverter (VSI) fed brushless DC motor (BLDC) drive using a single voltage sensor. The speed is controlled by controlling the DC bus voltage of the VSI. An electronic commutation of the BLDC motor is used which utilizes a fundamental frequency switching (FFS) of VSI which in-turn offers low switching losses; hence an efficient configuration is realized. A PFC integrated buck-boost buck converter is used as a front-end converter for its operation in a dualdiscontinuous conduction mode (DCM) for DC link voltage control and PFC operation. An advantage of fast voltage regulation, with high power factor for wide range of voltage conversion and a zero current switching (ZCS) at turn-on is achieved in this configuration. The proposed drive is designed to achieve an improved power quality at the AC mains for a wide range of speed control with power quality indices under acceptable limits by international power quality standards such as IEC 61000-3-2. Keywords–BLDC motor drive, buck-boost buck converter, PFC, power quality.