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Rapid capacitance induction device and capacitance signal detection method

A capacitive sensing and signal measurement technology, applied in electrical components, physical parameter compensation/prevention, analog-to-digital converters, etc., can solve the problem of low scanning frequency of capacitive sensors, save time for signal measurement and conversion, and increase voltage difference , reducing the effect of time

Active Publication Date: 2020-10-30
上海海栎创科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a fast capacitive sensing device and capacitive signal detection method, at least to solve the problem of low scanning frequency of capacitive sensors

Method used

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  • Rapid capacitance induction device and capacitance signal detection method
  • Rapid capacitance induction device and capacitance signal detection method
  • Rapid capacitance induction device and capacitance signal detection method

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Embodiment 1

[0038] Embodiment 1 provides a fast capacitive sensing device. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, and should not be construed as limiting the present invention. Such as figure 2 and image 3 As shown, the fast capacitive sensing device includes:

[0039] Signal common mode compensation and integration circuit, signal transfer circuit, signal measurement circuit;

[0040] The signal common mode compensation and integration circuit includes an integral capacitor Ci and its switch array, an operational amplifier circuit, a sampling capacitor Cx and its switch array, and the negative input terminal of the operational amplifier circuit is connected to the integral capacitor Ci and its switch array at the same time The first terminal a1 of the sampling capacitor Cx and the first terminal b1 of the switch array thereof, the output terminal of the operational amplifier circuit ...

Embodiment 2

[0046] Embodiment 2 can be further improved on the basis of Embodiment 1, and descriptions of the same or similar parts are omitted. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention. Specifically, this embodiment includes:

[0047] Please refer to image 3 , the operational amplifier circuit includes a first operational amplifier opal, the positive input terminal of the first operational amplifier is the positive input terminal of the operational amplifier circuit, the negative input terminal of the first operational amplifier is connected to the first end of the switch Sinn, The second terminal of the switch Sinn is the negative input terminal of the operational amplifier circuit, the output terminal of the first operational amplifier is the output terminal of the operational amplifier circuit, and the switch Swresi is connected between the negativ...

Embodiment 3

[0060] Embodiment 3 may be further improved on the basis of Embodiment 1 or Embodiment 2, and descriptions of the same or similar parts are omitted. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention. Specifically, this embodiment includes:

[0061] Please refer to image 3 , also includes a compensating driving voltage source VCOM connected to the third terminal a3 and the fourth terminal a4 of the integrating capacitor Ci and its switch array.

[0062] The integral capacitor Ci and its switch array also include a switch S1L arranged at the first end of the integral capacitor Ci, and a switch S1R arranged at the second end of the integral capacitor Ci. of the precharge.

[0063] The compensation driving voltage source VCOM is used to precharge the integral capacitor, and the typical compensation charge is VCOM*Ci. It can be seen that the compensati...

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Abstract

The invention discloses a rapid capacitance induction device and a capacitance signal detection method. The rapid capacitance induction device comprises a signal common-mode compensation and integration circuit, a signal transfer circuit and a signal measurement circuit. The signal common-mode compensation and integration circuit comprises an integration capacitor Ci, a switch array of the integration capacitor Ci, an operational amplification circuit, a sampling capacitor Cx and a switch array of the sampling capacitor Cx. The signal transfer circuit comprises a sampling capacitor Cx and a switch array thereof; the signal measurement circuit comprises an integration capacitor Cmea, a switch array of the integration capacitor Cmea, an operational amplifier circuit and an ADC. Under the induction device disclosed by the invention, the design cost is basically unchanged, but the capacitive induction scanning frequency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design and capacitance signal processing, and relates to a fast capacitance sensing device and a capacitance signal detection method. Background technique [0002] Conventional capacitive sensing devices such as figure 1 shown. Capacitance detection generally includes external sensor reset, external sensor capacitance common mode compensation, integration, conversion and other processes. The external sensor reset depends on the RC time parameter of the external sensor device, and generally takes several to tens of microseconds. [0003] There are usually two methods for external sensor capacitance common mode compensation: current source charge compensation and capacitive charge compensation. Due to the existence of the distributed resistance R of the external sensor in the former, the compensation current cannot be too large. Too much current will compress the voltage margin of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12H03M1/08
CPCH03M1/08H03M1/1245
Inventor 王建军朱定飞刘华
Owner 上海海栎创科技股份有限公司
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