Flame temperature detection circuit of household gas kitchen range

Abstract

The invention relates to a flame temperature detection circuit for household gas cooker intelligent controller, comprising a single-chip microcomputer, an amplifying circuit, an adding circuit, a thermocouple temperature sensor, a reference voltage source circuit, which is characterized in that: the thermocouple temperature sensor and the reference voltage circuit are both connected with the adding circuit; the adding circuit is connected with the operational amplifier and the operational amplifier is connected with the single-chip microcomputer with an A / D converter. At present, certain potential safety hazards exist in the gas cooker in prior use . The flame temperature is detected by the thermocouple temperature sensor of the invention; the negative electrical potential and voltage signal brought by the flame temperature is superposed by the reference voltage, and then is amplified through the operational amplifier, and at last is transported to the A / D converting channel; the single-chip microcomputer estimates whether the cooker has extinguished through detecting the AD converting value; if the cooker has extinguished, the alarm signal is output and the gas inlet valve of the cooker is closed automatically to greatly improve the safety of the cooker.

Description

technical field [0001] The invention relates to a temperature detection circuit, in particular to a circuit for detecting the flame temperature of a household gas cooker, which is a part of the circuit of an intelligent controller of the household gas cooker. Background technique [0002] Kitchen gas stove is an indispensable household appliance in people's daily life, but its structure has hardly changed for decades. It is the only product among all household appliances that has not yet realized electrification and intelligent control. Therefore, it is necessary to introduce technologies such as microprocessor and automatic control to make the gas cooker intelligent, thereby reducing the labor intensity of cooking and improving the safety of the gas cooker. The low-end and mid-range gas cookers currently in use do not have a flame temperature detection circuit. Therefore, when the cooker is blown by the wind or boiled with water overflowing, it is easy to cause the cooker t...

AI Technical Summary

Problems solved by technology

The low-end and mid-range gas cookers currently in use do not have a flame temperature detection circuit. Therefore, when the cooker is blown by the wind or boiled with water overflowing, it is easy to cause the cooker to turn off accidentally. major nauseous accident

[0003] At present, high-end gas cookers also use a combination of thermocouples and miniature solenoid valves to form a protection device for accidental flameout of the cooker. This device relies on the induction potential generated by the thermocouple to supply power to the solenoid valve, making it self-protecting. Because the flame temperature is very high Therefore, after several years of continuous use, the thermocouple is prone to wear and tear, and the induced potential generated by it gradually decreases. In the later stage, the solenoid valve cannot be closed, and the cooker cannot work normally.

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