Control method for heating device and refrigerator having the heating device

A control method for a heating device, the heating device comprising a heating chamber for accommodating an object to be processed, and an electromagnetic wave generating system, the electromagnetic wave generating system at least partially disposed within the heating chamber or reaching the heating chamber, the electromagnetic wave generating system comprising a frequency source for generating an electromagnetic wave signal, and a power amplifier for amplifying the power of the electromagnetic wave signal;

• wherein the control method comprises:
• Step A:
• determining a working efficiency of the power amplifier based on a frequency of the electromagnetic wave signal, the working efficiency being a ratio of an output power output by the power amplifier to an input power input to the power amplifier;
• Step B:
• adjusting the output power based on the working efficiency, such that a heat output of the power amplifier is less than or equal to a preset heat threshold, the heat output being the difference between the input power and the output power.