Induction heating apparatus

An induction heating apparatus, comprising:

• a top plate for placing an object to be heated thereon;
• a heating coil adapted to generate an induction magnetic field for heating the object;
• a control portion adapted to control a high-frequency electric current applied to the heating coil for heating the object;
• and
• an infrared-ray detection portion adapted to detect an infrared ray radiated according to a temperature of the object and to output an infrared-ray detection signal according to infrared-ray energy of the detected infrared ray;
• wherein the infrared-ray detection portion includes:
• an infrared-ray reception portion adapted to output a detection signal, when receiving an infrared ray radiated from the object,
• an amplification portion adapted to amplify the detection signal from the infrared-ray reception portion and output the infrared-ray detection signal, and
• a temperature detection portion adapted to detect a temperature of the infrared-ray reception portion and to output the detected temperature to the control portion, and
• wherein the control portion includes a correction portion adapted to correct the infrared-ray detection signal and output an infrared-ray real signal by using negative-signal information about a negative signal, which is superimposed on the infrared-ray detection signal output from the infrared-ray detection portion, and which has a reverse polarity from that of the infrared-ray detection signal, and the negative-signal information is generated in response to the temperature of the infrared-ray reception portion, when the temperature of the infrared-ray reception portion is equal to or higher than the temperature detected by the infrared-ray detection portion.