Cookware and electric heater for cookware

Abstract

The invention discloses a cookware and an electric heater thereof. The electric heater comprises an interaction interface, a first inductor whose first end is connected with a power supply, an IGBT whose first end is grounded, a resonant coil whose first and second ends are connected with the second end of the first inductor and the second end of the IGBT respectively, a first capacitor whose first end and second ends are connected with the first end of the resonant coil and the grounded respectively, multiple resonant capacitor branches and a control circuit; the first end of each resonant capacitor branch is connected with the second end of the resonant coil, the second end of each resonant capacitor branch is grounded, and each resonant capacitor branch comprises a resonant capacitor and a switch in serial connection; and the control circuit controls ON / OFF of the IGBT and the switches in the resonant capacitor branches according to a user instruction. Thus, different resonant capacitors can be selected, resonance parameters can be adjusted, the power range of continuous heating is broadened, and it is ensured that the IGBT works in the optimal state, the reliability is improved effectively, and cooking experience of a user is improved.

Description

technical field [0001] The invention relates to the technical field of living appliances, in particular to a cooking appliance and an electric heating device for the cooking appliance. Background technique [0002] Most of the related electric heating devices use LC resonant circuit for resonant heating. However, the resonant circuit has frequency-selective characteristics. Only when the operating frequency of the switching tube is consistent with the resonant frequency of the resonant circuit, the heating device will have the highest operating power and the best working state, and the greater the operating frequency of the switching tube deviates from the resonant frequency, the heating The lower the operating power of the device, the worse the working condition, and the IGBT tube is easily damaged. Therefore, the problem in the related art is that the heating device can only realize continuous heating within a narrow preset power range of heat generation, which cannot mee...

AI Technical Summary

Problems solved by technology

However, the resonant circuit has frequency-selective characteristics. Only when the operating frequency of the switching tube is consistent with the resonant frequency of the resonant circuit, the heating device will have the highest operating power and the best working state, and the greater the operating frequency of the switching tube deviates from the resonant frequency, the heating The lower the operating power of the device, the worse the working condition, and the IGBT tube is easily damaged

Therefore, the problem in the related art is that the heating device can only realize continuous heating within a narrow preset power range of heat generation, which cannot meet the needs of users

Assuming that the preset power range is 1000W-1800W, then for low-power cooking needs below 1000W, only intermittent heating can be used to achieve heating. However, the cooking effect of intermittent heating is poor and cannot meet user needs

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