| 摘要 |
PROBLEM TO BE SOLVED: To enhance drive frequency detection accuracy by counting a drive pulse signal driving a switching element in a predetermined time, detect drive frequency from the number of pulses to distinguish a load, and make the counting time of the drive pulse signal to be changeable. SOLUTION: Based on a heating control method and a setting temperature selected in an input means 10 and a temperature detected by a temperature element 2, a control signal is transferred to a drive means 14 via an induction heating control means 12 in order to hold the setting temperature of a load pan 1 by a temperature adjustment means 13. Based on this control signal, the switching element 6 in an induction heating portion 8 is on-off controlled at high speed, a current is caused to flow in a heating coil 5 by this control and an inverter circuit 7 so as to heat the load pan 1. When a voltage detection means 9 detects the voltage value peak of a main power supply 3, a transmission means 15 transmits a current value flowing in the coil and both ends voltage of the element 6 to a control means 12. A frequency detection means 16 detects the drive frequency of the element 6 making on and off by the pulse signal from the means 14 so as to transmit to the means 12. |
