Three-phase uninterruptible power supply maintaining reserve energy sources in idling condition with unbalanced loads
US4238688A · kind A · utility
6Cited by
6References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1978 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Oct 23, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/084
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control arrangement for a three-phase, uninterruptible power supply generates timing signals to drive the static switches of inverters located in each phase. This control arrangement precisely controls the phase differences of the inverter signals with relation to each other so that while the overall three-phase power supplied by the inverters is nulled, power circulation through the inverters compensates for unbalanced output loads thereby maintaining balanced phase angles between the output voltage and a balanced input impedance at the input of the power supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.