| 摘要 |
PROBLEM TO BE SOLVED: To obtain a cooker allowing appropriate setting of start timing of switching operation. SOLUTION: This cooker has a current transformer 14 for detecting a resonance current Ic flowing through a resonance capacitor 12 constituting a resonant circuit 13 together with a primary side coil 6a of a high frequency transformer 6 driving a magnetron 9; and a phase detection circuit 15 for shifting a phase by use of a phase shift circuit such that a zero-cross point of a signal Vc obtained by converting the resonance current Ic into a voltage coincides with timing T2 in which a voltage Vd1 between terminals becomes 0 V, and setting on-timing of IGBTs 7, 8 in the timing of detecting the phase-shifted zero-cross point. |
