Cooking utensil and electric heating device for cooking utensil

Abstract

The invention discloses a cooking utensil and an electric heating device for the cooking utensil. The cooking utensil comprises a first inductor, an IGBT, a first resonance coil, a second resonance coil, a first capacitor, a second capacitor, a third capacitor, a switch component and a controller, wherein the first end of the first resonance coil is connected with the first inductor; the second end of the first resonance coil is connected with the first end of the second resonance coil; the second end of the second resonance coil is connected with the second end of the IGBT; the first end of the second capacitor is connected with the first end of the first resonance coil; the second end of the second capacitor is connected with the first end of the third capacitor; the second end of the third capacitor is connected with that of the second resonance coil; the first end of the switch component is connected with a first node between the first resonance coil and the second resonance coil; the second end of the switch component is connected with a second node between the second capacitor and the third capacitor; the controller is used for controlling the on/off of the IGBT and the switch component. Therefore, zero voltage crossing switching-on of the IGBT under high power and low power can be guaranteed to prevent the IGBT from being damaged.

Description

technical field [0001] The present invention relates to the technical field of household electrical 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 employ a parallel resonant circuit. In the related art, the resonance parameters of the parallel resonant circuit are generally set on the premise of realizing high-power operation. However, its disadvantage is that for the resonance parameters set under high power, if the electric heating device runs continuously at low power, it is difficult to control the zero-crossing turn-on of the IGBT tube voltage. 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. Therefore, there is a need for impro...

AI Technical Summary

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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