Refrigerator and method for controlling the same

A refrigerator, comprising:

• a storage compartment;
• a cold air duct disposed behind the storage compartment;
• a fan disposed in the cold air duct;
• a sterilizing lamp configured to emit ultraviolet light to sterilize air supplied to the storage compartment through the cold air duct;
• a contamination sensor configured to detect a contamination level in the storage compartment;
• a first temperature sensor configured to detect a first temperature of the sterilizing lamp;
• a second temperature sensor configured to detect a second temperature of the storage compartment;
• and
• a controller including at least one processor, comprising processing circuitry, individually and/or collectively configured to:
• control the fan and the sterilizing lamp,
• determine a sterilization intensity based on the contamination level detected by the contamination sensor,
• determine a rotation speed of the fan and an input voltage of the sterilizing lamp corresponding to the rotation speed of the fan, based on the determined sterilization intensity, and
• adjust the input voltage of the sterilizing lamp based on the first temperature of the sterilizing lamp or the second temperature of the storage compartment.