Variable frequency refrigerator is a refrigerator produced by using a single-phase AC motor as the driving motor for the refrigerator compressor. The single-phase AC motor uses a variable frequency power supply to adjust the cooling capacity of the compressor. Compared to fixed frequency refrigerators, variable frequency refrigerators have the characteristics of high temperature control accuracy, low operating noise, and high energy efficiency, and are gradually being accepted by consumers.

Variable frequency air conditioner refers to a conventional air conditioner equipped with a frequency converter. The main unit of the variable frequency air conditioner is automatically infinitely variable, which rectifies and filters the 50Hz current of the power grid to obtain a DC power of about 310V. After this DC power is inverted, it can be used to control the operation of the compressor as a variable frequency power supply, which converts the 50Hz power grid frequency into 30-130Hz. Compared to fixed frequency air conditioners, variable frequency air conditioners have advantages such as energy saving, low noise, high temperature control accuracy, and low voltage requirements.