Detection method and microwave oven

Abstract

The invention provides a detection method and a microwave oven. The method comprises the steps that a sound signal in the heating chamber of the microwave oven is acquired when the microwave generating device of the microwave oven is in a working state; whether the sound signal includes a metal ignition sound is detected; and when the metal ignition sound exists, the microwave generating device of the microwave oven is turned off. A metal utensil is detected without drilling in the heating chamber. Microwave leakage is avoided. The microwave oven has the advantages of simple structure, low cost and high integration.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a detection method and a microwave oven. Background technique [0002] A microwave oven is a cooking appliance that uses food to absorb microwave energy in a microwave field to heat itself. Similar kitchen appliances also include microwave ovens. Its working principle is roughly that the microwave generating device (such as semiconductor microwave source, magnetron) in the microwave oven generates microwaves, and the water and other polar molecules in the food are driven by the microwaves to generate high-frequency rotation and friction, thereby making the food The temperature can rise sharply in a short period of time. [0003] However, microwaves cannot pass through metals. When microwaves touch metals, most of them will be reflected back. When metals continue to reflect microwaves at a high speed, sparks will appear on the metal surface. fire accident. Therefo...

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Problems solved by technology

However, this solution needs to drill holes in the heating cavity, which easily causes microwave leakage, and the circuit structure of the magnetic field generating device and the magnetic field sensing device are complex, low in integration, and high in cost.

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