Method and apparatus for selectively maintaining circuit power when higher voltages are present
US7671489B1 · kind B1 · utility
5Cited by
120References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2002 |
| Grant date | Mar 2, 2010 |
| Priority date | — |
| Expiry date | Mar 2, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J9/061
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for detecting the presence of a specified voltage source and automatically switching off a second voltage source regardless of voltage source potential of the two voltage sources are disclosed. The present invention uses pinch-off of a JFET, controlled by an inverter, to control a backup power supply based on the availability of the main supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.