Static inverter with energy return
US4348719A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1979 |
| Grant date | Sep 7, 1982 |
| Priority date | — |
| Expiry date | Oct 19, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a static inverter for providing a low-frequency output (e.g. 60 Hz) from a d.c. supply, the passage of low-frequency currents through the inverter transformer is avoided by producing a train of high-frequency pulses (e.g. 40 kHz) which represent, for example by their pulse widths, the successive instantaneous amplitudes of the required low-frequency voltage. These pulses cause a train of corresponding pulses to be produced at the secondary of the transformer, and this train is filtered to produce a unidirectional voltage having the desired instantaneous amplitudes. This voltage is fed to a transistor switching bridge which changes the unidirectional voltage into an alternating voltage having the required low frequency. A circuit is preferably provided to allow regeneration of power from the load back into the d.c. supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.