STATE DETECTION DEVICE FOR DETECTING OPERATION STATE OF HIGH-FREQUENCY HEATING APPARATUS
First Claim
1. A state detection device for detecting an operating state of a high-frequency heating apparatus including a magnetron for generating microwave, comprising:
- an anode current input portion which inputs a detected anode current of the magnetron, anda determination portion which reads the anode current inputted by the anode current input portion and determines the operating state of the high-frequency heating apparatus based on the anode current, whereinthe determination portion receives an output control signal for controlling an output of the magnetron and changes a threshold value for determining the state in accordance with a value of the output control signal.
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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 resistor 40 of a magnetron is inputted into the A/D converter terminal of a microcomputer 27 on 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 microcomputer 27 determines an operating state based on a plurality of the anode voltage IaDC values thus read. Further, the microcomputer 27 obtains a summed value of the IaDC values corresponding to one period of the revolution of rotary antennas 68, 69 to thereby determines the operating state of the high-frequency heating apparatus 100 based 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 microcomputer 27 changes, 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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Citations
12 Claims
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1. A state detection device for detecting an operating state of a high-frequency heating apparatus including a magnetron for generating microwave, comprising:
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an anode current input portion which inputs a detected anode current of the magnetron, and a determination portion which reads the anode current inputted by the anode current input portion and determines the operating state of the high-frequency heating apparatus based on the anode current, wherein the determination portion receives an output control signal for controlling an output of the magnetron and changes a threshold value for determining the state in accordance with a value of the output control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A state detection method for detecting an operating state of a high-frequency heating apparatus including a magnetron for generating microwave, comprising:
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a step of inputting a detected anode current of the magnetron; a step of reading an anode current inputted by the anode current input portion and determining the operating state of the high-frequency heating apparatus based on the anode current; and a step of changing a threshold value for determining the state in accordance with a value of the output control signal. - View Dependent Claims (12)
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Specification