Three phase power circuit
US3993943A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1975 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | May 1, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/525
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power circuit including an x and y inverter, an x and y constant voltage transformer, and a filtered d.c. input operable to provide a three phase sine wave output. The three phase outputs from the two transformers are a result of interconnections of the secondary windings of the transformer - in essence connecting the conventional two phase to three phase connections. The circuit is operable to provide a constant three phase output when a balanced load is applied. With an unbalanced load the phase of the output voltages of the two transformers are corrected relative to each other. A feedback circuit that includes an oscillator continuously samples the phase of the output voltage of each of the two transformers and adjusts the phase of one transformer output to that of the other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.