Cooking device for maintaining heat retention, method for maintaining heat retention in cooking device, and wireless power transmission device

A cooking appliance configured to maintain heat retention of contents, the cooking appliance comprising:

• a wireless power receiver configured to receive power transmitted from a wireless power transmission device;
• a communication interface configured to communicate with the wireless power transmission device;
• a first temperature sensor configured to measure a temperature of the contents;
• at least one memory storing one or more instructions;
• and
• at least one processor configured to execute the one or more instructions, wherein the one or more instructions, when executed by the at least one processor, cause the cooking appliance to:
• based on entering a heat retention mode, compare the temperature of the contents measured via the first temperature sensor with a target heat retention temperature, and
• based on the temperature of the contents being equal to or greater than the target heat retention temperature, cause power control information to be transmitted to the wireless power transmission device, wherein the power control information is configured to cause the wireless power transmission device to suspend transmission of first power for driving the communication interface and to resume transmission of the first power after a preset time elapses.