ZETA CONVERTER DEVELOPMENT ON POWER FACTOR IMPROVEMENT OF BRUSHLESS DIRECT CURRENT MOTOR DRIVES
Abstract
This study aims to increase the brushless DC (BLDC) motor's efficiency in low power applications. The researchers developed a power factor correction (PFC) based alpha converter system with a decreased sensor element layout. By changing the DC voltage supplied to the voltage source inverter (VSI) that powers the motor, the speed of the BLDC motor may be changed. The electronic commutation of the BLDC motor is replaced with a low frequency switching technique to reduce switching losses in the system. The alpha converter uses a technology that decreases greenhouse gas emissions by employing just one voltage(V) sensor element for both Direct Currentlink voltage monitoring and Power Factor Correction activity. It is designed to operate in discontinuous conduction mode (DCM). The suggested system is intended to work across a wide range of speed control with increase in power quality. The researchers accomplished this by employing a voltage follower technique, which assures a constant voltage supply to the BLDC motor. This method eliminates the need for extra sensing units, simplifying the system and lowering expenses. The system's low-frequency switching approach also contributes to increased efficiency by lowering switching losses. This method includes switching the VSI at a lower frequency, resulting in decreased losses and increased performance. Furthermore, the system employs a PFC-based technique that contributes to the total power factor of the system. Overall, this research proposes a unique method for increasing the efficiency and performance of BLDC motors in low-power applications. The decreased sensor element layout and low-frequency switching approach employed in the suggested system aid to simplify the system and improve its overall performance. The system is intended to work across a wide speed control range with enhanced power quality on air conditioning mains, making it a potential choice for low-power applications requiring dependable and efficient motor control.
Keywords
BLDC (Brushless DC Motor), DCM, PFC (Power-Factor correction), VSI (Voltage Source Inverter), SEPIC Converter.