Interface insertion anomaly detection circuit and method

Patent metadata

Field	Value
Publication number	US-2016349308-A1
Application number	US-201415114966-A
Country	US
Kind code	A1
Filing date	May 8, 2014
Priority date	Jan 28, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

Provided are an interface insertion anomaly detection circuit and method applicable to the field of mobile terminals. The interface insertion anomaly detection circuit comprises a power circuit ( 4 ), and further comprises: a first USB interface ( 1 ), comprising a first power line and a first signal line, a power end of the first power line being connected to the power circuit ( 4 ); a second USB interface ( 2 ), comprising a second power line and a second signal line, the second power line and the second signal line being short-circuit connected, wherein the second USB interface ( 2 ) connects the second signal and the first signal line through insertion to the first USB interface ( 1 ); and a controller ( 3 ), a first voltage collection end and a second voltage collection end thereof being respectively connected to the power end of the first power line and a signal end of the first signal line. The controller ( 3 ) can determine, according to a calculated voltage difference, whether the first power line and the second power line are well connected by insertion, and then determine whether to start or resume charging a cell of a mobile terminal through the first USB interface ( 1 ) and the second USB interface ( 2 ).

First claim

What is claimed is:

1 . A detection circuit for detecting an abnormal interface coupling, comprising a power circuit, and being characterized at, further comprising:
a first USB interface, comprising a first power wire and a first signal wire, wherein a power end of the first power wire is coupled to the power circuit; a second USB interface, comprising a second power wire and a second signal wire, wherein the second power wire and the second signal wire are short-circuited coupled; the second USB interface is coupled with the first USB interface, such that the second signal wire is coupled with the first signal wire; the first power wire is configured to receive a power signal outputted by the power circuit, and to output the power signal received to the second power wire in the second USB interface coupled with the first USB interface; and a controller, comprising a first voltage sampling end coupled to the power end of the first power wire in the first USB interface, and a second voltage sampling end coupled to a signal end of the first signal wire in the first USB interface; and configured to acquire a voltage of the first power wire and a voltage of the first signal wire in the first USB interface through a coupling between the first USB interface and the second USB interface, to calculate a voltage difference between the voltage of the first power wire and the voltage of the first signal wire, and to determine whether the interface coupling is abnormal according to the voltage difference.

2 . The detection circuit according to claim 1 , being characterized at that, further comprising:
an alarm circuit, comprising a controlled end coupled to a control end of the controller; and configured to receive a prompt instruction sent by the controller and to issue an alarm, if the voltage difference between the voltage of the first power wire and the voltage of the first signal wire is greater than a preset voltage threshold.

3 . The detection circuit according to claim 1 , being characterized at that,
the first USB interface is a USB socket, and the power circuit, the first USB interface and the controller are included in a mobile terminal; and the second USB interface is a USB plug and included in a charging adapter.

4 . The detection circuit according to claim 1 , being characterized at that,
the first USB interface is a USB plug, the power circuit, the first USB interface and the controller are included in a charging adapter; and the second USB interface is a USB socket and included in a mobile terminal.

5 . The detection circuit according to any one of claims 1 - 4 , being characterized at that,
the first USB interface comprises P first power wires, where P is greater than or equal to 2; and the first USB interface further comprises Q first ground wires, where Q is greater than or equal to 2.

6 . The detection circuit according to claim 5 , being characterized at that,
the second USB interface comprises M second power wires, where M is greater than or equal to 2; and the second USB interface comprises N second ground wires, where N is greater than or equal to 2.

7 . The detection circuit according to claim 6 , being characterized at that,
P, M, Q and N are identical to each other; each first power wire in the first USB interface is made of chromium bronze C18400 or phosphor bronze C7025, each first ground wire in the first USB interface is made of chromium bronze C 18400 or phosphor bronze C7025, each second power wire in the second USB interface is made of chromium bronze C18400 or phosphor bronze C7025, and each second ground wire in the second USB interface is made of chromium bronze C18400 or phosphor bronze C7025.

8 . A method for detecting an abnormal interface coupling, applied in a detection circuit for detecting an abnormal interface coupling comprising a controller, a first USB interface, a second USB interface and a power circuit, a first signal wire in the first USB interface being coupled with a second signal wire in the second USB interface when the first USB interface is coupled with the second USB interface, and being characterized at that, the method comprises:
short-circuited coupling a second power wire in the second USB interface with the second signal wire in the second USB interface; outputting by the power circuit a power signal to a first power wire in the first USB interface when the first USB interface is coupled with the second USB interface, such that the first USB interface outputs the power signal to the second power wire in the second USB interface via the first power wire; and detecting by the controller a voltage of the first power wire in the first USB interface and a voltage of the first signal wire in the first USB interface, calculating a voltage difference between the voltage of the first power wire and the voltage of the first signal wire, and determining whether a coupling between the first USB interface and the second USB interface is abnormal according to the voltage difference.

9 . The method according to claim 8 , being characterized at that, further comprising:
controlling by the controller an alarm circuit to issue an alarm, and sending a detection stop instruction to the power circuit for controlling the power circuit to stop outputting the power signal to the first power wire in the first USB interface, if the voltage difference between the voltage of the first power wire and the voltage of the first signal wire is greater than a preset voltage threshold.

10 . The method according to claim 9 , being characterized at that, after controlling by the controller an alarm circuit to issue an alarm, further comprising:
sending by the controller a detection instruction to the power circuit after a preset time period, such that the power circuit outputs the power signal to the first power wire in the first USB interface.

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

• Zhang Jialiang
• Wu Kewei
• Wu Jie
• Yuan Xingwei
• Shuai Feiwu

Classifications

• H04M1/72409 Primary

  by interfacing with external accessories (hands-free H04M1/60) · CPC title

• G01R31/66

  Testing of connections, e.g. of plugs or non-disconnectable joints (testing for incorrect line connections G01R31/55) · CPC title

• H02J7/00

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• G01R31/68 Primary

  Testing of releasable connections, e.g. of terminals mounted on a printed circuit board · CPC title

• G06F11/221

  to test buses, lines or interfaces, e.g. stuck-at or open line faults · CPC title