Magnetron state detection method, device and equipment

Abstract

The invention discloses a magnetron state detection method, device and equipment. The method comprises steps that according to set sampling frequency, an anode current of a magnetron is acquired; based on data points of the acquired anode current, envelope of the anode current is drafted; according to the envelope, a state of the magnetron is detected. The method is advantaged in that the state ofthe magnetron can be determined according to envelope waveform of one sample period, and state detection efficiency is substantially improved.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a state detection method, device and equipment of a magnetron. Background technique [0002] Abnormal operation of microwave ovens (such as no-load) is an abnormal working state, which will lead to safety hazards such as excessive temperature rise of the magnetron, microwave focusing and sparking in the cavity, which not only affects product reliability and life, but also threatens User Safety. Therefore, microwave oven anomaly detection technology is very important. [0003] Currently, microwave anomaly detection technologies include: [0004] (1) Abnormality detection is performed based on the collector-emitter voltage signal of the magnetron driving power supply transistor. When the microwave oven is unloaded, the temperature of the magnetron magnet will increase, resulting in a change in magnetism, thereby reducing the oscillation threshold voltage. When the ...

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Problems solved by technology

[0006] However, the above-mentioned technique (1) needs to detect an AC signal with a frequency of 50kHz, so the ADC sampling rate and precision of the detection circuit are required to be relatively high

In addition, the fluctuation of the input voltage and the temperature rise of the device will also affect the size of the oscillation threshold voltage, and the set threshold voltage remains unchanged, which will easily cause misjudgment or missed judgment.

[0007] The above technology (2), because it needs to detect the anode current drift for a long time to be identified, and the set threshold needs to be adjusted in real time according to the input voltage, input power, etc., the control logic is complicated; in addition, the threshold voltage is also easily affected by the temperature of the device. The impact of rising, it is easy to cause misjudgment or missed judgment

[0008] It can be seen that the existing microwave oven anomaly detection technology has high requirements on the performance of the components in the detection circuit, which leads to the problems of high detection cost, long detection time and / or the problem of easy misjudgment or missed judgment.

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