Ice cream is spread in the trunk of the car with alternating current. According to the relevant public information, the DC provided by the vehicle battery can be converted into AC by the vehicle inverter, and then the AC ice cream machine can be used. It is necessary to select the corresponding frequency converter according to the power demand of the selected ice cream machine. In addition, attention should also be paid to the installation and use specifications of on-board inverters to ensure safe and reliable power supply.