Short-circuit protection of communication controller

By applying current and measuring voltage to determine the short circuit situation, the short circuit problem caused by the reduction of the spacing between the USB port and the socket is solved, and effective short circuit protection for the USB communication system is achieved to prevent equipment damage.

CN113646982BActive Publication Date: 2025-05-30TEXAS INSTRUMENTS INC
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Patent Information

Application Number
CN202080022138.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2019-03-21
Filing Date
2020-03-20
Publication Date
2025-05-30
Estimated Expiration
2040-03-20

AI Technical Summary

Technical Problem

As the spacing in the USB port and socket decreases, the chance of short circuits between pins, pads, or other conductive elements increases, resulting in unintended operation, damage or damage of the device. The existing technology has insufficient external short circuit protection and cannot effectively prevent the short circuit from causing damage to USB cables, plugs, sockets or USB PD controllers.

Method used

A known amount of current is selectively applied on the VBUS terminal, the configuration channel (CC) 1 terminal and/or the CC2 terminal of the USB communication system, and the resultant voltage is measured to determine the amount of resistance at the terminal. Based on the measurement results of resistance and voltage, determine whether there is a short circuit in the socket or plug. Processing component controls the switch to achieve short circuit protection to prevent signal application to the VBUS terminal when a short circuit is detected.

Benefits of technology

It effectively prevents the USB communication system from detecting a short circuit before establishing communication, avoiding unexpected operation, damage and damage of the host or device, and protects the USB cable, plug, socket and USB PD controller.

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Abstract

Aspects of the present disclosure provide a circuit (300). In some examples, the circuit includes: a first current source (302) having a terminal coupled to a first node (314) and a second terminal, a first switch (306) coupled between the second terminal of the first current source and a second node (316), a first resistor (310) coupled between the second node and a ground terminal (318), a second current source (304) having a terminal coupled to the first node and a second terminal, a second switch (308) coupled between the second terminal of the second current source and a third node (320), a second resistor (312) coupled between the third node and the ground terminal, a third current source having a terminal coupled to the first node and a second terminal, a third switch coupled between the second terminal of the third current source and a fourth node, and a third resistor coupled between the fourth node and the ground terminal.
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