| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnetic induction heating cooker in which cooking can be continued without stopping an inverter circuit which automatically stops the operation of a pot detection circuit when cooking is carried out by setting a power setting value at small, and the problem of determining a small pot as having no-pot due to the difference of the size of the diameter of the pot can be solved also. SOLUTION: This electromagnetic induction heating cooker comprises a phase difference detector circuit for outputting a phase differential detected signal by detecting the phase differential between an output voltage and an output current of an inverter circuit, and a pot detection circuit which, when the value of the phase differential detected signal is larger than the phase differential determination signal determined beforehand, determines that the pot is not mounted and outputs a no-pot detected signal, and by stopping the drive of the inverter drive circuit, stops the supply of a high frequency current. A frequency-corresponding pot-detection control circuit is provided which drives the inverter drive circuit SD regardless of the no-pot detected signal, when the output frequency of the inverter circuit is higher than the frequency judgement signal determined beforehand. Then, it controls the drive of the inverter drive circuit according to the no-pot detected signal, when the output frequency is lower than the frequency determination signal. COPYRIGHT: (C)2004,JPO&NCIPI |
