Power conversion system and uninterruptible power supply system
US9093861B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2010 |
| Grant date | Jul 28, 2015 |
| Priority date | — |
| Expiry date | Jan 24, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J9/061
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An uninterruptible power supply system includes a plurality of uninterruptible power supply devices connected in parallel between a commercial AC power supply and a load; and a control unit selecting the required number of uninterruptible power supply devices for driving the load from the plurality of uninterruptible power supply devices, to cause each selected uninterruptible power supply device to be operated and to cause each remaining uninterruptible power supply device to be stopped. This control unit changes the uninterruptible power supply devices to be operated from one to another in a predetermined cycle such that the plurality of uninterruptible power supply devices are identical in operation time to one another. Accordingly, the continuous operation time of each of the uninterruptible power supply devices can be shortened, so that failures occurring in each uninterruptible power supply device can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.