Control circuit for cookware material judgment and method thereof

Abstract

The invention discloses a control circuit for cookware material judgment and a method thereof. The method comprises the following steps: when an electromagnetic heating device works, a control unit controls an IGBT (Insulated Gate Bipolar Transistor) so as to enable a heating unit to heat; a signal generating unit outputs pulse signals to an MCU (Micro Controller Unit) of the control unit correspondingly according to the on / off state of the IGBT; the MCU records the input pulse signals and converts the pulse signals into frequency M; the frequency M is compared with preset frequency threshold N, and the type of cookware is determined to be A when the frequency M is higher than the preset frequency threshold N; the type of the cookware is determined to be B when the frequency M is less than or equal to the preset frequency threshold N; and the MCU adjusts related heating parameters according to the determined type of the cookware, so as to enable the electromagnetic heating device to adjust a heating state. The control circuit and the method have the advantages that an electromagnetic oven can be adjusted into a working state corresponding to the material of the cookware, the material of the cookware is judged in good time so as to carry out error check, and the like; and the material of the cookware is accurately updated so as to adjust the heating state and increase the heating efficiency.

Description

technical field [0001] The invention relates to a control circuit and a method for judging pot material. Background technique [0002] There are many materials of pots used in electromagnetic heating devices, and the characteristics of pots of different materials when working on electromagnetic heating devices are very different. In order to make electromagnetic heating devices work in the best state, it is very important to judge the material of the pots used. necessary. At present, the method of judging the type of cookware mostly adopts the current judgment method, that is, a fixed turn-on time is given to the IGBT at the beginning of heating, and the magnitude of the current after the IGBT is turned on is detected, thereby judging the material of the cookware. The disadvantage of this method is that the material of the pot is only judged when the heating is just started, or when no pot is detected to be reheated. Once the judgment is wrong, the pot will not be judged ag...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the material of the pot is only judged when the heating is just started, or when no pot is detected to be reheated. Once the judgment is wrong, the pot will not be judged again during subsequent continuous heating. Yes, and the current difference of different pots under the same PPG is greatly affected by the voltage, and it is easy to cause misjudgment under different voltages

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