Title:
METHOD FOR ELIMINATING BUTTON BASE, CAPACITIVE BUTTON DETECTION CIRCUIT AND INTELLIGENT TERMINAL
Document Type and Number:
WIPO Patent Application WO/2019/241968
Kind Code:
A1
Abstract:
A method for eliminating a button base, which relates to the technical field of capacitive buttons and which is applied to a capacitive button detection circuit, the capacitive button detection circuit comprising: a drive voltage end (Vch), a capacitance detection circuit (20), and a variable capacitor (10), an end of the variable capacitor (10) being connected to a button to be detected; in a charging phase, two ends of the variable capacitor (10) are simultaneously connected to the drive voltage end (Vch); in a discharging phase, an end of the variable capacitor (10) that is connected to the button to be detected is connected to a negative input end of the capacitance detection circuit (20), while the other end is grounded; the method for eliminating a button base comprises: detecting an output voltage of the capacitive button detection circuit (20) (201); determining whether the output voltage satisfies a preset condition (202); if the output voltage does not satisfy the preset condition, adjusting the capacitance of the variable capacitor (10) until the output voltage satisfies the preset condition (203). The same capacitive button detection circuit may dynamically cancel out parasitic capacitance (Cs) having an intolerable capacitance value, being applicable to different capacitive buttons, ensuring that the operating states of capacitive buttons are more optimal, and having wide applications.
Inventors:
ZHENG YINXIANG (CN)
Application Number:
PCT/CN2018/092222
Publication Date:
December 26, 2019
Filing Date:
June 21, 2018
Export Citation:
Assignee:
SHENZHEN GOODIX TECH CO LTD (CN)
International Classes:
H03K17/96
Foreign References:
| CN106663202A | 2017-05-10 | |||
| CN105024681A | 2015-11-04 | |||
| CN1773442A | 2006-05-17 | |||
| CN101101525A | 2008-01-09 | |||
| CN106796259A | 2017-05-31 | |||
| JP2009222523A | 2009-10-01 |
Attorney, Agent or Firm:
SHANGHAI CHENHAO INTELLECTUAL PROPERTY LAW FIRM GENERAL PARTNERSHIP (CN)
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