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Capacitance signal detection circuit with the function of shielding interference

A technology for signal detection and shielding interference, which is applied in the field of circuits, can solve the problem that capacitive signals are susceptible to external electromagnetic wave interference, and achieve the effects of easy signal processing, low output impedance, and high input impedance

Active Publication Date: 2021-10-01
DEYANG NEWPEACE AUTOMATION INSTR CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this disclosure is to provide a capacitance signal detection circuit with the function of shielding interference, which is used to solve the technical problem in the related art that the capacitance signal measured by the liquid level gauge using probe capacitance is easily interfered by external electromagnetic waves

Method used

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  • Capacitance signal detection circuit with the function of shielding interference
  • Capacitance signal detection circuit with the function of shielding interference
  • Capacitance signal detection circuit with the function of shielding interference

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Embodiment Construction

[0053] Specific embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0054] figure 1 It is a schematic diagram of a capacitive signal detection circuit with the function of shielding interference shown according to an exemplary embodiment, as shown in figure 1 As shown, the capacitance signal detection circuit 10 includes an operational amplifier U1, a capacitance signal conversion circuit 11, a frequency divider U2, a first capacitor C1, a second capacitor C2 and a third capacitor C3, wherein:

[0055] The model of the operational amplifier U1 is OP162GS, the second pin of the operational amplifier U1 is connected to the sixth pin of the operational amplifier U1, and the sixth pin is also connected to one end of the first ca...

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Abstract

The present disclosure relates to a capacitance signal detection circuit with the function of shielding interference, the capacitance signal detection circuit includes an operational amplifier, a capacitance signal conversion circuit, a frequency divider, a first capacitor, a second capacitor and a third capacitor, the second capacitor of the operational amplifier The pin is connected to the 6th pin of the operational amplifier, the 6th pin is also connected to one end of the first capacitor, the other end of the first capacitor is grounded, the 6th pin is also used to connect with the probe capacitor, the 3rd pin of the operational amplifier The pin is connected to one end of the second capacitor, the other end of the second capacitor is grounded, and the third pin is also connected to the probe capacitor; the capacitance signal conversion circuit is connected to the third pin of the operational amplifier; the 16th pin of the frequency divider is connected to One end of the power supply and the third capacitor, the other end of the third capacitor is grounded, the 11th pin of the frequency divider is connected to the capacitance signal conversion circuit to receive the pulse signal transmitted by the capacitance signal conversion circuit, and passes through the 13th pin of the frequency divider The pin will output the pulse signal.

Description

technical field [0001] The present disclosure relates to the field of circuit technology, in particular, to a capacitance signal detection circuit with a function of shielding interference. Background technique [0002] A liquid level gauge is a device used to measure the level of a liquid medium. Common liquid level gauges are maglev. Liquid level gauge, pressure type liquid level gauge, magnetic flap liquid level gauge, etc. [0003] In the related art, there is a liquid level gauge that uses a probe capacitance to convert the height of the liquid into a capacitance signal, and then judge the level of the liquid level through the measured capacitance signal. However, since the liquid level gauge adopts a long wire for the probe capacitance, it is easily disturbed by external electromagnetic waves, which in turn makes the accuracy of the measured capacitance signal affect the accuracy of judging the liquid level height. Therefore, it is necessary to design a capacitive si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/26
CPCG01F23/263G01F23/266
Inventor 方毅查华明张艺耀
Owner DEYANG NEWPEACE AUTOMATION INSTR CO LTD
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