A refrigerator comprising: a cabinet; a storage compartment provided inside the cabinet and defined by an inner case of the cabinet; a shelf provided in the storage compartment, the shelf comprising a light source unit configured to illuminate an interior region of the storage compartment; a door configured to open and close the storage compartment; a transmitter electrically connected to an external power supply, the transmitter comprising a module configured to receive a preset voltage for the external power supply and a first resonator having a first coil and a first capacitor connected to the first coil in series; a receiver spaced apart from the transmitter by less than a predetermined distance, the receiver comprising a second resonator having a second coil and a second capacitor connected to the second coil in series or in parallel and electrically connected to the light source unit of the shelf; and at least one processor, characterized by the transmitter configured to: resonate at a first resonance frequency in which primary resonance occurs when only the transmitter is present without the receiver and resonate at a second resonance frequency in which secondary resonance occurs when the receiver is disposed spaced apart from the transmitter by less than a predetermined distance, wherein a value of the second resonance frequency is set at least double a value of the first resonance frequency; and wirelessly convey power from the transmitter to the receiver via the second resonance frequency, in which the secondary resonance occurs, the at least one processor configured to: detect whether the door of the refrigerator is open; based on a detection that the door of the refrigerator is open, control a supply of power from the external power supply to the transmitter; wirelessly transmit, by the transmitter, at least some of the supplied power to the light source unit via the receiver; determine whether the door has remained open for at least a predetermined duration of time; and based on a determination that the door has remained open for at least the predetermined duration of time, control a cutoff of the power supplied from the external power supply to the transmitter. a cabinet; a storage compartment provided inside the cabinet and defined by an inner case of the cabinet; a shelf provided in the storage compartment, the shelf comprising a light source unit configured to illuminate an interior region of the storage compartment; a door configured to open and close the storage compartment; a transmitter electrically connected to an external power supply, the transmitter comprising a module configured to receive a preset voltage for the external power supply and a first resonator having a first coil and a first capacitor connected to the first coil in series; a receiver spaced apart from the transmitter by less than a predetermined distance, the receiver comprising a second resonator having a second coil and a second capacitor connected to the second coil in series or in parallel and electrically connected to the light source unit of the shelf; and at least one processor, characterized by the transmitter configured to: resonate at a first resonance frequency in which primary resonance occurs when only the transmitter is present without the receiver and resonate at a second resonance frequency in which secondary resonance occurs when the receiver is disposed spaced apart from the transmitter by less than a predetermined distance, wherein a value of the second resonance frequency is set at least double a value of the first resonance frequency; and wirelessly convey power from the transmitter to the receiver via the second resonance frequency, in which the secondary resonance occurs, resonate at a first resonance frequency in which primary resonance occurs when only the transmitter is present without the receiver and resonate at a second resonance frequency in which secondary resonance occurs when the receiver is disposed spaced apart from the transmitter by less than a predetermined distance, wherein a value of the second resonance frequency is set at least double a value of the first resonance frequency; and wirelessly convey power from the transmitter to the receiver via the second resonance frequency, in which the secondary resonance occurs, the at least one processor configured to: detect whether the door of the refrigerator is open; based on a detection that the door of the refrigerator is open, control a supply of power from the external power supply to the transmitter; wirelessly transmit, by the transmitter, at least some of the supplied power to the light source unit via the receiver; determine whether the door has remained open for at least a predetermined duration of time; and based on a determination that the door has remained open for at least the predetermined duration of time, control a cutoff of the power supplied from the external power supply to the transmitter. detect whether the door of the refrigerator is open; based on a detection that the door of the refrigerator is open, control a supply of power from the external power supply to the transmitter; wirelessly transmit, by the transmitter, at least some of the supplied power to the light source unit via the receiver; determine whether the door has remained open for at least a predetermined duration of time; and based on a determination that the door has remained open for at least the predetermined duration of time, control a cutoff of the power supplied from the external power supply to the transmitter.