Single wire radio to charger communications method
US6300743A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2000 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Mar 8, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/00034
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention is a single wire interface communication system whereby a phone having internal charging circuitry communicates the charging status of the battery attached to the phone by varying the duty cycle of a pulse with a predetermined period across the single wire interface. In a preferred embodiment, the predetermined pulse of time T, where T is 1 second, is divided into N divisions, where N equals 10. A duty cycle high for time T/N and low for time 9T/N represents a first charging state; a duty cycle high for time 2T/N and low for time 8T/N corresponds to a second charging state; and so on. The system allows for information to be transmitted across a single wire, thereby freeing data connections for other accessories.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.