Cooking appliance and electric heating device for cooking appliance

Abstract

The invention discloses a cooling utensil and an electric heating device for the cooking utensil. The electric heating device comprises a first inductor with the first end connected with a power supply, an IGBT with the first end grounded, a resonance coil with the first end connected with the second end of the first inductor and the second end connected with the second end of the IGBT, a first capacitor with the first end connected with the first end of the resonance coil and the second end grounded, a second capacity with the first end connected with the first end of the resonance coil and the second end connected with the first end of a third capacitor, the third capacitor with the second end connected with the second end of the resonance coil, a switch assembly with the first end connected with a first joint between the second capacitor and the third capacitor and the second end grounded, and a controller for controlling the connection or disconnection of the IGBT and the switch assembly. Thus, by switching the resonance mode of the electric heating device, the voltage zero-pass opening of the IGBT can be ensured under large power and continuous low power, and the IGBT is prevented from damage.

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] Related electric heating devices with a single IGBT tube usually use a parallel resonant circuit. In the related art, the resonance parameters of the parallel resonance circuit are generally set on the premise of realizing high-power operation. However, its disadvantage is that for the resonance parameters set at high power, if the electric heating device operates continuously at low power, it is difficult to control the IGBT tube voltage to turn on at zero crossing, the IGBT tube will be turned on ahead of time, and the transient current at the moment of turn-on If the peak value is too high, the IGBT tube will be damaged, and it will also cause serious heating of the IGBT tube, so it is necessary to increase the heat sink or increase the fan speed to enhance th...

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Problems solved by technology

However, its disadvantage is that for the resonance parameters set at high power, if the electric heating device operates continuously at low power, it is difficult to control the IGBT tube voltage to turn on at zero crossing, the IGBT tube will be turned on ahead of time, and the transient current at the moment of turn-on If the peak value is too high, the IGBT tube will be damaged, and it will also cause serious heating of the IGBT tube, so it is necessary to increase the heat sink or increase the fan speed to enhance the heat dissipation of the IGBT tube

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