H - Electricity – 05 – B
Patent
H - Electricity
05
B
324/2
H05B 6/08 (2006.01) G05D 23/19 (2006.01) H02H 3/00 (2006.01)
Patent
CA 1329828
CONTROLLING DEVICE FOR ELECTRIC APPARATUS Abstract The present invention relates to an apparatus and method for determining whether the power supply or the magnetron has failed in a power supply circuit for powering a magnetron. The circuit comprises a magnetron and a dual half wave doubler circuit having dual first and second circuit portions which include first and second transformers, respectively. A sensing unit is provided for sensing the magnitude of a first current flowing in the primary of the first transformer. Another sensing unit is provided for sensing the magnitude of a second current flowing in the primary of the second transformer. A comparator is provided for comparing the magnitude of the first and second currents to determine if the first current is more than a certain amount greater than the second current or is the second current is more than a certain amount greater than the first current, whereby it is determined whether the power supply has failed.
616502
Kurita Hitoshi
Senda Hiroyuki
Terasaki Hiroshi
Kirby Eades Gale Baker
Matsushita Electric Industrial Co. Ltd.
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