Continuous monitoring of a USB client for battery charging specification charging capacity
US8386814B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2010 |
| Grant date | Feb 26, 2013 |
| Priority date | — |
| Expiry date | Mar 12, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An embodiment of the invention provides a method for continuously detecting when a USB client device may be charged according to a BCS charging standard. Power is supplied from a USB host device to the USB client device with a first current limit. Next, the USB host device monitors data lines D+ and D− for a first part of a handshake. When the first part of the handshake is detected, a second part of the handshake is provided by the USB host device indicating that the USB client device may be changed according to the BCS charging standard. All current sources and all voltage sources that are coupled to the data lines D+ and D− are decoupled from data lines D+ and D− after the handshake is complete. After the data lines are decoupled, communication may begin between the USB host device and the USB client device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.