Power regulating circuit, microwave oven and power regulating method

Abstract

The invention provides a power regulating circuit, a microwave oven and a power regulating method. The power regulating circuit comprises a current sampling unit, a comparing unit and a power control unit. The current sampling unit is used for collecting current secondary current values of a magnetron in the microwave oven. The comparing unit is used for receiving current sampling signals from the current sampling unit, comparing the current sampling signals with a reference signal, outputting regulating signals to the power control unit according to comparison results, and storing current secondary current values or the difference values of the current secondary current values and an initial secondary current value when the current secondary current values are within a preset range, so that the power control unit can output power to the magnetron based on the current secondary current values or the difference values in the next-time starting process. The power control unit is used for regulating the power output to the magnetron according to the regulating signals of the comparing unit. Through the technical scheme, the power output to the magnetron can be regulated automatically to obtain proper power values, and the output power of microwave ovens leaving a factory is made to be maintained the same basically.

Description

technical field [0001] The invention relates to the technical field of microwave heating, in particular to a power adjustment circuit, a microwave oven with the power adjustment circuit and a power adjustment method. Background technique [0002] In the production process of inverter microwave ovens, due to various factors such as differences in inverter components, individual magnetrons, chambers, and machine model specifications, the output power of inverter microwave ovens is not equal. The power value of microwave ovens has a large fluctuation range, some of which are as high as hundreds of watts. In order to ensure the performance of frequency conversion microwave ovens and the consistency of cooking effects, the power must be adjusted online to make the power of each microwave oven stable at ±15W Within (or within other smaller power ranges). The traditional method is to add a sliding regulator to the frequency converter or frequency conversion microwave oven. In actu...

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Problems solved by technology

[0003] The traditional adjustment method has low efficiency and low reliability, and requires additional personnel and equipment, resulting in high cost. In addition, since the output power of microwave ovens is generally above 800W, manual adjustment of high power also has potential safety hazards.

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