Slide capacitance induced water level and water flow accurate detection method and detection device

A technology of capacitive sensing and detection method, applied in the direction of liquid level indicator for physical variable measurement, etc., can solve problems such as hidden safety hazards, easy failure, complex structure, etc., to avoid high temperature and fire, no mechanical loss, safety factor high effect

Active Publication Date: 2013-01-09
东莞朗勤电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the existing technical problems such as complex structure, high cost, easy failure, and potential safety hazards in the existing technology

Method used

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  • Slide capacitance induced water level and water flow accurate detection method and detection device
  • Slide capacitance induced water level and water flow accurate detection method and detection device
  • Slide capacitance induced water level and water flow accurate detection method and detection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]The PCB soft board is covered with N pieces of copper, which are arranged in the insulating shell from top to bottom in sequence; the height of the total number of copper clad pieces on the PCB soft board is determined by the height of the water level of the water tank, and the total number of copper covers is the highest water level of the water tank Height; the copper clad interval is 0.2-0.5mm; one end of each copper clad is connected to the corresponding input port of the TOUCH chip as a water level and volume capacitive sensing plate, and the other end of the copper clad is grounded. The water level and water volume capacitive sensing plate is sealed and insulated in the shell, and the TOUCH chip continuously transmits AC pulse signals to the water level and water volume capacitive sensing plate through the connecting wire to measure the capacitance change on the sensing plate and monitor whether there is water close to the water level and water volume capacitive sens...

Embodiment 2

[0032] The water level and volume capacitive sensing plate is pressed by a metal spring and sensed close to the inner wall of the insulating shell. The metal springs are placed in the insulating shell from top to bottom in sequence. The total number of metal springs is the height of the highest water level of the water tank; The series matching resistor is connected to the TOUCH IC to sense the water level. The water level and water volume capacitive sensing plate is sealed and insulated in the shell, and the TOUCH chip continuously transmits AC pulse signals to the water level and water volume capacitive sensing plate through the connecting wire to measure the capacitance change on the sensing plate and monitor whether there is water close to the water level and water volume capacitive sensing plate; when the water touches or approaches the water level capacitive sensing plate, the high-precision digital capacitance converter (CDC) in the TOUCH IC detects the capacitance chang...

Embodiment 3

[0034] The water level and volume capacitive sensing plate is sensed by the conductive rubber close to the inner wall of the insulating shell. The conductive rubber is arranged in the insulating shell from top to bottom, and its height is the height of the highest water level of the water tank. connected to the wire to sense the water level. The water level and water volume capacitive sensing plate is sealed and insulated in the shell, and the TOUCH chip continuously transmits AC pulse signals to the water level and water volume capacitive sensing plate through the connecting wire to measure the capacitance change on the sensing plate and monitor whether there is water close to the water level and water volume capacitive sensing plate; when the water touches or approaches the water level capacitive sensing plate, the high-precision digital capacitance converter (CDC) in the TOUCH IC detects the capacitance change on the water level and water capacity capacitive sensing plate th...

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PUM

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Abstract

The invention relates to a slide capacitance induced water level and water flow accurate detection method and a detection device. The device comprises an induction panel and a circuit structure, wherein the induction panel comprises an insulation housing, a flexible PCB (Printed Circuit Board), a TOUCH chip, and a water level and water flow capacitance induction disc; the insulation housing is arranged vertically upward, wherein the flexible PCB is tightly adhered to the inner wall of the insulation housing; the TOUCH chip is arranged on the inner wall of the insulation housing; and the water level and water flow capacitance induction disc is sealed in the insulation housing, wherein the TOUCH chip continuously emits alternating-current pulse signals to measure change in capacitance on the induction disc and monitor whether water approaches the water level and water flow capacitance induction disc. The slide capacitance induced water level and water flow accurate detection device provided by the invention has the advantages of simple structure, low cost, low failure rate, high safety coefficient and the like; the water level and water flow capacitance induction disc detects corresponding changes of water level and water flow, and then a singlechip drives to display to indicate current state of water level and water flow, so that a consumer can clearly know the current water level and water flow of a water tank during the process of using a similar product with a water filling tank.

Description

technical field [0001] The invention relates to a water level detection method and a detection device, in particular to a sliding capacitance sensing water level detection method and a detection device. Background technique [0002] Currently, small household appliances, such as coffee machines and water dispensers, are generally equipped with water level detection devices. In the field of small household appliances, due to cost requirements, RC step-down is generally used to supply power to small home appliances, and the use of RC step-down power supply does not isolate the subsequent stage. And when the latter stage is not isolated, if the water level is directly detected, there will be a danger of electric leakage to the human body. [0003] Most of the existing water level detection devices use some mechanical magnetic switches, and it is very troublesome to install a buoy inside the water tank. An electromagnet induction reed switch is embedded inside the buoy to dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
Inventor 陈章谟刘永聪孔祥耀
Owner 东莞朗勤电子科技有限公司
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