Power supply circuit for portable battery powered device
US7402986B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2005 |
| Grant date | Jul 22, 2008 |
| Priority date | — |
| Expiry date | Nov 10, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/008
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to battery power peripheral devices such as MP3 players which are also periodically connected to another power source such as a mains wall socket or USB cable power bus. In particular, but not exclusively, the present invention relates to regulation of these voltage sources. In general terms the present invention provides a multiple supply rail for the load regulators of a power supply circuit for a battery powered device. One supply rail is coupled to the battery, and another is coupled to a non-battery source such as an external mains regulated source and/or a bus power wire from a USB cable or similar. The regulators have multiple inputs, each for taking their input voltage from one of these supply rails.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.