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Measuring circuit

A technology for measuring circuits and capacitors, applied in the field of circuits, can solve the problems of high cost, complex circuit structure, large pulsating noise, etc., and achieve the effects of low cost, high resolution, and overcoming poor stability.

Inactive Publication Date: 2012-05-30
SHANGHAI ANCAI INTELLIGENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they have the disadvantages of complex circuit structure, high cost, and large pulsating noise

Method used

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific implementation methods.

[0013] Such as figure 1 As shown, the measurement circuit of the present invention includes a current source 1, an electronic switch 2, a capacitor 3, a voltage comparator 4, an analog switch 5, a single-chip microcomputer 6, a keyboard 7 and a display 8; wherein, the current source 1 and the capacitor 3 pass through the electronic switch 2 are connected in series to form a closed loop, the two ends of the capacitor 3 are respectively connected to the two input terminals of the voltage comparator 4, the output terminal of the voltage comparator 4 is connected to the single-chip microcomputer 6, and at the same time, the single-chip microcomputer 6 is connected to the electronic switch 2 through the analog switch 5 Connect, and connect with keyboard 7 and monitor 8 simultaneously. Wherein, the current source 1 in the presen...

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Abstract

The invention discloses a measuring circuit that comprises a current source, an electronic switch, a capacitor, a voltage comparator, an analogue switch, a one-chip microcomputer, a keyboard and a display. The current source is in series connection with the capacitor by the electronic switch so as to form a closed loop; two ends of the capacitor are respectively connected with the two input terminals of the voltage comparator; the one-chip microcomputer is respectively connected with an output terminal of the voltage comparator, the keyboard and the display as well as is connected with the electronic switch through the analogue switch. According to the measuring circuit disclosed in the invention, because a time measuring method in an electronic technology is employed, high accuracy is realized and defects of poor stability of an amplifier and zero drift in a traditional measuring circuit are overcome; and moreover, the whole measuring circuit has advantages of simple structure, accurate measurement, and high resolution.

Description

technical field [0001] The invention relates to a circuit, in particular to a measuring circuit. Background technique [0002] Capacitive sensors are widely used to measure physical quantities such as liquid level, pressure, displacement, and acceleration. However, in some cases, the variation of the capacitance of the sensor is extremely small, roughly in the range of several to tens of pF, therefore, the corresponding capacitance measurement circuit needs to be more accurate. The methods for measuring tiny capacitances in the prior art mainly include the charge transfer method and the alternating current method. However, they have the disadvantages of complex circuit structure, high cost, and large pulsating noise. Contents of the invention [0003] The object of the present invention is to provide a measuring circuit with simple structure, low cost and low ripple noise. [0004] To achieve the above object, the technical solution provided by the invention is: [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
Inventor 朱明焕
Owner SHANGHAI ANCAI INTELLIGENT TECH