To prevent a microcomputer from running out of control even when a power supply voltage of the microcomputer is reduced, and to make the microcomputer operate with safety.
An induction heating cooker comprises: a heating coil 2; an inverter circuit 3; rectification means 7 rectifying an AC power supply 6 to supply power to the inverter circuit 3; control means 11 controlling the inverter circuit 3; a power supply circuit 15 supplying a power supply voltage to a microcomputer 12 configuring the control means 11; voltage detection means 16 detecting voltage of the power supply circuit 15; and operation frequency switching means 17 switching an operation frequency of the microcomputer 12 depending on the detection voltage detected by the voltage detection means 16. In the case that the power supply voltage of the microcomputer 12 fluctuates, the voltage detection means 16 detects the power supply voltage, and transmits a signal indicating that the power supply voltage fluctuates to the operation frequency switching means 17 to switch the operation frequency of the microcomputer 12, and thereby, the operation can be performed within an operation guarantee range of the microcomputer 12.
TAKAKURA SEIICHI
WATABE KATSUYUKI
Daisuke Nagano
Kentaro Fujii