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Soft-short overvoltage protection for data lines in quick charge USB charger

An overvoltage and voltage technology, applied in battery overvoltage protection, emergency protection circuit devices for limiting overcurrent/overvoltage, current collectors, etc., can solve the problems of unsafe and harmful differential signal pin voltage

Active Publication Date: 2017-12-01
DIALOG SEMICONDUCTOR GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But as the output voltage increases to support fast charging, the differential signal pin voltage may be driven to unsafe levels
For example, elevated differential signal voltages can be hazardous to the receiving circuitry of the differential signal in the device being charged

Method used

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  • Soft-short overvoltage protection for data lines in quick charge USB charger
  • Soft-short overvoltage protection for data lines in quick charge USB charger
  • Soft-short overvoltage protection for data lines in quick charge USB charger

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Embodiment Construction

[0015] To address the prior art need for soft short circuit protection for data cable based power converters, a voltage monitoring circuit is provided that determines if the data signal voltage on the cable exceeds a safe level. The following discussion will assume that the cable interface is a Universal Serial Bus (USB) interface, but it will be understood that any interface combining power and data signals may be protected as discussed herein. exist figure 1 An example system 100 is shown in . Power converter 105 may include a switching flyback converter or any other suitable power converter that converts power delivered by an input voltage V_in to an output voltage V_out. The power converter 105 drives the output voltage V_out into the VCC pin or a terminal of the USB interface 120 . USB cable 125 is coupled between USB interface 120 and load USB interface 130 for device 135 powered by power converter 105 .

[0016] The fast charge interface 110 of the power converter 10...

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Abstract

A switching power converter (105) is provided with an overvoltage protection circuit (115) that monitors the differential data signal voltages (D+, D-) in a data interface (125) such as a USB data interface powering a load device (135) to detect soft short conditions.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application No. 62 / 136,406, filed March 20, 2015, which is hereby incorporated by reference in its entirety. technical field [0003] The present application relates to power converters, and more particularly to protection circuits for power converters that charge devices through a data interface. Background technique [0004] Flyback switching power converters are typically used to charge mobile devices because the converter's transformer provides safe isolation from AC household current. It is common for a switching power converter to be coupled to the device being charged through a standard interface such as a Universal Serial Bus (USB) interface. The USB interface includes a differential signal pair (D+ and D-) for signaling and also provides power and ground. Regarding power delivery, the USB cable can only supply a certain amount of current. For exam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H02H7/12H02J7/00
CPCH02H7/12H02H9/04H02J7/0031H02M3/33592H02M3/33523H02H7/1227Y02B70/10H02J7/00308H02J7/00Y02B40/00H02J7/04
Inventor 姚建明李勇D·王
Owner DIALOG SEMICONDUCTOR GMBH