FIELD: electrical engineering.
SUBSTANCE: induction heating circuit includes a conducting heating element to generate heating by means of induction heating; induction coil capable to form magnetic field for induction heating; control signal shaper capable to define frequency of a signal to control induction coil and to shape control signal which becomes equal or higher than the set minimum frequency; current detecting unit capable to detect current corresponding to electric power supplied to induction coil; control unit capable to shape a signal about failure of supplied power when frequency of the control signal is a minimum frequency and detected current is less or equal to the preset value.
EFFECT: improvement of reliability for failure detection in short time.
8 cl, 7 dwg
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