System and method for providing external power on a universal serial bus
US8028178B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2008 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Oct 27, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/266
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A universal serial bus power control circuit including at least one first switch which selectively couples a power source node to an external power node, a comparator which detects when the external power node is charged, a feedback node for enabling voltage regulation, a charge circuit and a controller. The charge circuit charges the external power node from the power source node and selectively couples the feedback node to at least one of the power source node and the external power node. The controller opens the first switch when the external power node is not charged, controls the charge circuit to charge the external power node while coupling the feedback node to the power source node, and closes the first switch and couples the feedback node to the external power node in a host mode when the external power node is charged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.