Uninterruptible power supply
US5289045A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1993 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | Mar 22, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J9/062
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An uninterruptible power supply provides internal connection to an auxiliary power to provide continuous device power without duplicating regulation and switching circuits. The power supply includes an AC to DC converter, a transformer and a switch applying DC power from converter to the transformer. A pulse width modulation control circuit assures a regulated output voltage while application of auxiliary power is controlled by a fixed time interval one-shot that assures a smooth transition to AC utility power upon resumption of such power following a failure. An auxiliary AC power output signal is maintained for a video monitor or other device even while operating on auxiliary power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.