Low power connection detect method and system for USB charging
US9971395B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2015 |
| Grant date | May 15, 2018 |
| Priority date | — |
| Expiry date | Jul 11, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A USB hub has a USB hub controller, and an embedded controller, a USB port connector and associated port power control device and a controllable bypass switch providing a supply voltage to the USB port connector when the embedded controller enables it, a controllable voltage supply regulator unit providing a first output voltage which can be turned off and supplied to the port power control device, and a programmable current monitor circuit with a current sensor providing a second supply voltage to the monitor circuit, wherein during a low power mode, the USB hub controller and any port power control device are turned off and the monitor circuit is configured to provide the second supply voltage through the sensor and bypass switch to the USB connector and detects a current when a USB device is plugged into the USB port connector and wakes up the embedded controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.