High-frequency heating apparatus

A high-frequency heating apparatus comprising:

• a heating chamber configured to accommodate a load;
• a microwave source configured to generate a microwave, and to adjust a frequency and an output of the microwave;
• at least one radiator configured to radiate the microwave into the heating chamber to heat the load;
• a temperature detector configured to detect a temperature in the heating chamber;
• and
• a controller configured to cause the microwave source to adjust the output of the microwave, the adjustment being based on (i) the temperature in the heating chamber and (ii) a temperature profile defining a plurality of temperature processes to be performed sequentially, each of the plurality of temperature process defining a temperature change in the load over a time period for the temperature process,
• wherein while the at least one radiator radiates the microwave into the heating chamber to heat the load, the controller causes the microwave source to change the frequency of the microwave to evenly step through each of a plurality of different oscillation frequencies at a predetermined time interval during one cycle of adjusting the output of the microwave such that the load is heated at each of the plurality of different oscillation frequencies for a same amount of time during the one cycle of adjusting the output of the microwave.