Abstract: The working principle, advantages and disadvantages of sine wave FOC driving and traditional square wave driving are analyzed and compared. A new Cool-Tech^TM inverter technology is proposed from two aspects of software algorithm and hardware loss. Through the experimental verification, Inverter board based on Cool-Tech^TM frequency conversion technology can improve the COP value and speed stability of inverter compressor, reduce the power consumption of frost-free refrigerator without changing any other components.

Key words: Cool-Tech^TM, Inverter compressor, Torque compensation, Power consumption, Frost-free refrigerator