The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 15, 2016
Filed:
Jun. 27, 2013
Zte Corporation, Shenzhen, CN;
ZTE Corporation, Shenzhen, CN;
Abstract
A protection circuit of a communication interface includes: a first-level protection circuit, a second-level protection circuit and a third-level protection circuit that are sequentially connected, wherein the first-level protection circuit comprises a current discharge circuit comprising a first connection end, a second connection end and a third connection end, wherein the first connection end is connected with a first signal line of an RS-485 port, the second connection end is connected with a second signal line of the RS-485 port, and the third connection end is connected to the protection ground; the second-level protection circuit comprises a first current limiting resistor, a second current limiting resistor and a bidirectional transient suppression diode; and the third-level protection circuit comprises a voltage discharge circuit.