NOVEL SENSOR CIRCUIT APPLICABLE TO BOTH CONTACT DETECTION AND NON-CONTACT DETECTION

Title:

NOVEL SENSOR CIRCUIT APPLICABLE TO BOTH CONTACT DETECTION AND NON-CONTACT DETECTION

Document Type and Number:

WIPO Patent Application WO/2017/088300

Kind Code:

A1

Abstract:

A novel sensor circuit applicable to both contact detection and non-contact detection, comprising: a capacitor Cx, a resistor Re, a resistor Rf, a resistor R1, a resistor R2, and an operational amplifier A1. One end of the capacitor Cx is connected to a detection signal and the other end thereof is connected to a non-inverting input end of the operational amplifier A1; one end of the resistor Re is connected to the non-inverting input end of the operational amplifier A1 and the other end thereof is grounded; one end of the resistor Rf is connected to the non-inverting input end of the operational amplifier A1 and the other end thereof is connected to an output end of the operational amplifier A1; one end of the resistor R1 is connected to an inverting input end of the operational amplifier A1 and the other end thereof is grounded; one end of the resistor R2 is connected to the inverting input end of the operational amplifier A1 and the other end thereof is connected to the output end of the operational amplifier A1. The sensor has a simple circuit structure, is applicable to both contact detection and non-contact detection, can effectively avoid a change in circuit performance caused by a change in contact resistance or coupling capacitance, and can effectively reduce noise caused by the change in circuit performance.

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Inventors:

ZHANG LIMIN (CN)
TANG YUE (CN)
WU RONGRONG (CN)
YAN FENG (CN)

Application Number:

PCT/CN2016/071582

Publication Date:

June 01, 2017

Filing Date:

January 21, 2016

Export Citation:

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Assignee:

UNIV NANJING (CN)

International Classes:

G01R19/00

Foreign References:

CN103505202A	2014-01-15
CN104917471A	2015-09-16
CN102973261A	2013-03-20
CN101490564A	2009-07-22
CN101433461A	2009-05-20
US20090309605A1	2009-12-17

Attorney, Agent or Firm:

NANJING ZHISHI LAW FIRM OF INTELLECTUAL PROPERTY (CN)

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