Title:
ELECTROSTATIC PROTECTION CIRCUIT AND METHOD APPLIED TO ELECTRONIC DEVICE, AND STYLUS AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/223964
Kind Code:
A1
Abstract:
An electrostatic protection circuit applied to an electronic device, an electrostatic protection method applied to an electronic device, and a stylus and an electronic device. The electrostatic protection circuit comprises: a point discharge module (ESD_P) and a current-limiting resistor (R2), wherein the point discharge module (ESD_P) at least comprises two points (21, 22) separated from each other; the distance between the two points (21, 22) is not greater than a preset value; the point (21) of the point discharge module (ESD_P) is connected to an electrode of an electronic device, and the point (22) of the point discharge module (ESD_P) is connected to a ground terminal (GND); one end of the current-limiting resistor (R2) is connected to the electrode of the electronic device, and the other end thereof is connected to a test pin of a control chip in the electronic device; and the breakdown voltage of the point discharge module (ESD_P) is less than the divided voltage of the current-limiting resistor (R2), such that an electrostatic pulse generated outside the electronic device is discharged from the point discharge module (ESD_P) to the ground terminal (GND). The electrostatic protection circuit is arranged on a printed circuit board (PCB) of the electronic device. The electrostatic protection circuit reduces circuit costs, has a simple circuit design, and improves the performance of the electronic device.
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Inventors:
WANG TIANXING (CN)
WAN JIA (CN)
WAN JIA (CN)
Application Number:
PCT/CN2019/086228
Publication Date:
November 12, 2020
Filing Date:
May 09, 2019
Export Citation:
Assignee:
SHENZHEN GOODIX TECH CO LTD (CN)
International Classes:
H02H9/04
Foreign References:
| CN1878444A | 2006-12-13 | |||
| CN105680434A | 2016-06-15 | |||
| CN103327733A | 2013-09-25 | |||
| CN101969194A | 2011-02-09 | |||
| US20040047107A1 | 2004-03-11 |
Attorney, Agent or Firm:
BEIJING HEADSTAY INTELLECTUAL PROPERTY AGENCY (CN)
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