MICROWAVE OVEN WITH INVERTOR CONTROL POWER SOURCE

摘要

A microwave oven with an invertor control power source produces a microwave by the use of a magnetron in combination with high frequency power generated by an invertor control power source. Heat sensitive ferrite beads provided on a lead wire for transmitting the high frequency power to the magnetron changes the inductance of the wire from a high level to a low level at around a threshold temperature, which is lower than the working equilibrium temperature of the magnetron. As a result, the cathode filament current remains within the allowable range, and moding of the magnetron is prevented. Thus the lifetime of the magnetron is lengthened.