Glass kettle and capacitive water level detection device and method thereof

Abstract

The invention relates to a glass kettle, a capacitive water level detection device and a method thereof. The capacitance type water level detection device comprises a high water level induction disc,a low water level induction disc and a capacitance detection circuit board, the high water level induction disc and the low water level induction disc are two conductive films which are fixedly arranged on the outer wall of the glass kettle body and correspond to a high water level line and a low water level line respectively; the capacitance detection circuit board is arranged on a chassis of theglass kettle body and is electrically connected with a single chip microcomputer of the glass kettle and is provided with a touch sensing chip, the high water level induction disc and the low water level induction disc are electrically connected to two induction input ports of the touch induction chip respectively; the capacitance detection circuit board detects a capacitance value through the two induction input ports and compares the capacitance value with a preset no-water capacitance value interval and a preset water capacitance value interval in the single-chip microcomputer or the touchinduction chip, and therefore whether the water level of the glass kettle reaches a high-low water level line is judged. The glass kettle is simple in structure and convenient to disassemble and assemble, non-contact detection is adopted, and safety is high.

Description

technical field [0001] The invention relates to the technical field of kettles, in particular to a glass kettle and a capacitive water level detection device and method thereof. Background technique [0002] Existing glass kettles generally consist of an electric heating base and a kettle body, wherein the kettle body is provided with a heating unit, the base is provided with a control circuit, the heating unit is connected to the control circuit through a coupler, or is communicated through a wireless communication module, and the kettle The body is also equipped with a temperature sensor. When in use, just put the glass kettle on the base, you can connect the base with the heating unit of the glass kettle body, press the control button on the base, you can make the heating unit work, so that the water in the glass kettle can be heated Heating, and the temperature sensor on the pot body can transmit the water temperature in the pot to the base, so that the power supply is ...

AI Technical Summary

Problems solved by technology

However, this method will be equivalent to different resistance values ​​due to different water quality and conductivity, thus detecting different partial voltages. For example, because the equivalent resistance of pure water is large, the current passing through the electrodes is very small Small; and daily tap water containing a lot of minerals has a low resistivity, so the current passing through the electrode will be relatively large

Therefore, the same amount of water will produce different currents due to different water quality, and the voltage detected from the voltage divider circuit will have a large difference, and misjudgment often occurs.

Moreover, the water level probe is installed in the pot in direct contact with the water. After a long time of use, it will be covered by scale and become non-conductive or the conductivity will decrease, which is more likely to cause misjudgment.

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