Cooking appliance, control device and control method thereof

Abstract

The present invention proposes a cooking utensil and its control device and method, wherein the control device of the cooking utensil includes: a rectification circuit, which is used to rectify the alternating current output by the alternating current power supply to output pulsating direct current; a resonant circuit, a resonant circuit It includes ultrasonic transducers and resonant inductors connected in series; an excitation circuit, the input end of the excitation circuit is connected with the output end of the rectification circuit, and the output end of the excitation circuit is connected with the resonant circuit; a temperature detection circuit, the temperature detection circuit is used to detect the ultrasonic transducer The temperature of the transducer; the control circuit, the control circuit is connected to the control terminal of the excitation circuit and the temperature detection circuit respectively, and the control circuit is used to output the driving signal to the excitation circuit according to the temperature of the ultrasonic transducer, so as to provide excitation to the resonant circuit through the excitation circuit The power supply, thus, can make the frequency of the driving signal consistent with the current resonance frequency of the resonance circuit, so that the ultrasonic transducer can work in an optimal state.

Description

technical field [0001] The present invention relates to the technical field of household appliances, in particular to a control device for a cooking appliance, a cooking appliance and a control method for the cooking appliance. Background technique [0002] When the existing cooking utensils (such as pressure cooker) are cooking, due to the high pressure in the pot, the food cannot be rolled, and the nutrients are difficult to separate out, and the porridge and soup made are light and taste poor. For this reason, the ultrasonic vibration technology is used in the related art to solve this problem well. By providing an AC signal of a certain frequency to the ultrasonic transducer, the ultrasonic transducer converts electrical energy into kinetic energy, so that the water molecules in the pot vibrate mechanically at high frequency, and transmit it to the food to decompose the nutrients in the food. The ultrasonic transducer is an important core component of cooking appliances...

AI Technical Summary

Problems solved by technology

[0003] At present, when the ultrasonic transducer is driven, the AC point signal of fixed frequency is input to the resonant circuit, but the ultrasonic transducer will generate heat during the vibration work process, and the temperature of the ultrasonic transducer will rise, and then It will affect the electrical parameters of the ultrasonic transducer, and the resonant frequency of the resonant circuit will drift. This drift will increase the reactance component in the circuit, increase the reactive power, and further increase the temperature, which will damage the transducer element. risk

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