| 摘要 |
<p>PURPOSE:To prevent production of interferrence sound when a plurality of induction heat cooking devices are used close to each other by setting an action frequency constant, and changing the energization time for two switching elements so as to change a heating power. CONSTITUTION:A changeable duty oscillation circuit 19 changes the ratio of an energization time for a switching element Qa to an energization time for a switching element Qb corresponding to an instruction from a duty setting circuit 20. The oscillation frequency of the changeable duty oscillation circuit 19 is set to be close to a resonance frequency of a load circuit 15. In this constitution, a heating power can be changed without changing an action frequency corresponding to the instruction from the duty setting circuit 20. Interferrence sound to occur when a plural induction heat cooking devices are used close to each other can thus be prevented, thereby an induction heat cooking device having a good environmental property can be obtained.</p> |
