An object of the present invention is to provide an inverter circuit in which soft start can be implemented by a simple circuit added thereto. In high-frequency heating apparatus for driving a magnetron, a DC power supply is chopped by two semiconductor switching devices, and this is output as an AC current through a resonance circuit. The high-frequency heating apparatus includes a dead time generation circuit for turning off the semiconductor switching devices concurrently. In the high-frequency heating apparatus, a drive unit for driving the aforementioned semiconductor switching devices has a function of limiting the lowest frequency of a frequency with which the semiconductor switching devices are driven. The aforementioned lowest frequency is set to be high at the beginning of operation of the high-frequency heating apparatus, and the aforementioned lowest frequency is set to be lower gradually thereafter.
申请公布号
EP1734791(A1)
申请公布日期
2006.12.20
申请号
EP20050728854
申请日期
2005.04.04
申请人
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD
发明人
SUENAGA, H.;MORIYA, H.;SAKAI, S.;MORIKAWA, H.;MATSUKURA, T.;SHIROKAWA, N.