Patent ID: 7312612
Filing Date: 2007-12-25
Classification: G01R,G05F,H05B

Abstract:
1. An electric current detection circuit in an induction heating device comprising: a current transformer having a primary winding connected to a coil of the induction heating device; a buffer; a diode configured to detect a peak value of an input current, the diode comprising an anode connected to a secondary winding of the current transformer at an input side of the circuit and a cathode connected to the buffer at an output side of the circuit; capacitor having one end connected to the cathode of the diode and the other end connected to a ground potential and configured to output a detected peak value of the input current via the buffer at the secondary winding of the current transformer; a zener diode connected between the diode and the buffer, said zener diode comprising a cathode connected to both the cathode of the diode and an input terminal of the buffer, and an anode connected to a ground potential; and a control apparatus configured to compare a target value with the detected peak value outputted via the buffer and control a current applied to the coil of induction heating device according to a result of the comparing.