Title:
CAPACITANCE MEASURING SYSTEM AND METHOD
Document Type and Number:
WIPO Patent Application WO/2021/026794
Kind Code:
A1
Abstract:
A system (100) operable between a charging mode and a transferring mode for measuring capacitance of a capacitive sensor (10), includes a switching unit (102) configured to arrange the capacitive sensor (10) to be charged by a first supply voltage (14a) from a first end (10a) of the capacitive sensor (10) until a voltage difference between the first end (10a) and an opposite second end (10b) of the capacitive sensor (10) reaches a first predetermined voltage in a first phase of the charging mode, and disconnect the first end (10a) of the capacitive sensor (10) from the first supply voltage (14a ) and couple the second end (10b) of the capacitive sensor (10) to a second supply voltage (14b) to raise a voltage at the first end (10a) of the capacitive sensor (10) to a second predetermined voltage in a second phase of the charging mode.
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Inventors:
ZHANG JUN (CN)
PAN YAOHUA (CN)
PAN YAOHUA (CN)
Application Number:
PCT/CN2019/100499
Publication Date:
February 18, 2021
Filing Date:
August 14, 2019
Export Citation:
Assignee:
TEXAS INSTRUMENTS INC (US)
TEXAS INSTRUMENTS JAPAN LTD (JP)
TEXAS INSTRUMENTS JAPAN LTD (JP)
International Classes:
H03K17/955; G06F3/044; H03K17/96
Foreign References:
| CN106249970A | 2016-12-21 | |||
| CN104885366A | 2015-09-02 | |||
| CN104571734A | 2015-04-29 | |||
| US20130285733A1 | 2013-10-31 | |||
| CN105549094A | 2016-05-04 |
Attorney, Agent or Firm:
JEEKAI & PARTNERS (CN)
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