System for sensing the presence of a load in an oven cavity of a microwave cooking appliance
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United States of America Patent
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Mar 15, 2005
Grant Date -
N/A
app pub date -
Apr 8, 2004
filing date -
Apr 8, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A microwave cooking appliance includes an oven cavity, a magnetron and a load sensing system. The load sensing system is used to detects the presence of a load in the oven cavity by introducing a high frequency energy burst into the oven cavity, with the energy burst being reflected back. A controller, based on a time period between emitted and reflected signals, determines whether a load is present in the oven cavity. If no load is present, operation of the magnetron is terminated. Preferably, the high frequency energy burst is an ultrasonic acoustic frequency energy burst in a range between approximately 10 kHz and 100 kHz.
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