Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With voltage or current conversion
Reexamination Certificate
2011-06-14
2011-06-14
Nguyen, Vinh P (Department: 2858)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With voltage or current conversion
C324S076110
Reexamination Certificate
active
07960966
ABSTRACT:
An operating state detection technique is provided which makes it possible to accurately detect an abnormality of a high-frequency heating apparatus. An anode current detected by the anode current detection resistor40of a magnetron is inputted into the A/D converter terminal of a microcomputer27on a control panel circuit board side. The current is subjected to an analog-to-digital conversion to thereby obtain an anode voltage IaDC value. The microcomputer27determines an operating state based on a plurality of the anode voltage IaDC values thus read. Further, the microcomputer27obtains a summed value of the IaDC values corresponding to one period of the revolution of rotary antennas68, 69to thereby determines the operating state of the high-frequency heating apparatus100based on the summed value. According to the aforesaid IaDC value reading method, it makes it possible to accurately detect an abnormality without an erroneous operation also in correspondence to the change of the feeding distribution. Further, the microcomputer27changes, in accordance with the set output of the high-frequency heating apparatus, a threshold value used for determining the abnormality and a changing value (increasing amount) from the start of the operation with respect to the change of the output of the apparatus and the operating state of a heated subject etc., whereby it makes it possible to accurately detect an abnormality without an erroneous operation.
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Kinoshita Manabu
Moriya Hideaki
Sakai Shin-ichi
Shirokawa Nobuo
Suenaga Haruo
Nguyen Vinh P
Panasonic Corporation
Pearne & Gordon LLP
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