Electric-kettle water level detection method

Abstract

The invention discloses an electric-kettle water level detection method. An electric kettle comprises a host and a kettle body, a cavity is defined in the kettle body, and a water level detection head is arranged at the bottom of the cavity; the water level detection head is wrapped with an insulating material and the upper end of the water level detection head is exposed in the cavity; a coupler and a single-chip microcomputer are arranged on the host, and the coupler is connected with the single-chip microcomputer; the kettle body and the water level detection head are respectively connected with the single-chip microcomputer through the coupler, the kettle body, a medium in the kettle, the water level detection head and the like form an equivalent resistance and capacitance circuit, the single-chip microcomputer and the equivalent resistance and capacitance circuit is charged and discharged, water level is judged by the single-chip microcomputer according to charging time of the equivalent resistance and capacitance circuit, and more accurate judgment is achieved; misjudgment due to loose contact of the kettle body and the coupler is avoided, and requirements of a traditional water level detection technology on a water-conductivity resistor are met.

Description

technical field [0001] The invention relates to the technical field of water level detection methods for electric kettles. Background technique [0002] With the wide application of bottom water supply and automatic rotating water tower, the application of electric kettle water level detection is becoming more and more extensive. The traditional technology uses a fixed resistor with a known resistance in series with the water resistor, and then connects a capacitor in parallel for filtering. The A / D port of the battery is used to detect the divided voltage value, and the water level in the kettle is judged according to the size of the voltage value. [0003] If the connection between the kettle and the coupler is not good, the detected water resistance is very large. At this time, the control circuit of the host may misjudge that there is no water in the kettle; The water resistance increases; the difference in water resistance between different water qualities is large, fo...

AI Technical Summary

Problems solved by technology

[0003] If the connection between the kettle and the coupler is not good, the detected water resistance is very large. At this time, the control circuit of the host may misjudge that there is no water in the kettle; The water resistance increases; the difference in water resistance between different water qualities is large, for example, the water resistance of pure water is greater than that of tap water, which will lead to misjudgment

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