High-frequency PWM drive
Speed regulation is implemented using different modes depending on the cost and performance of the final application where the motor is used. The induction motor is driven in high-frequency mode by an innovative single-switch topology, which delivers a silent and cost-effective variable speed drive. The speed is controlled by modulating the actual motor voltage. The power switch runs in PWM mode and its duty cycle changes linearly to control the speed according to torque.
AN2446: STEVAL-IHT002V1 intelligent thermostat for compressor based on ST7Ultralite MCU