Power converter apparatus and method employing plural branches
US4628438A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1983 |
| Grant date | Dec 9, 1986 |
| Priority date | — |
| Expiry date | Dec 16, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/538
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An uninterrupted AC supply includes an AC to DC converter having several DC storage devices which maintain a constant DC voltage in the event of a failure of several cycles of the AC source. Each of the storage devices is connected to a separate branch circuit. Each branch circuit includes a transistor that is driven in a linear manner during a portion of a quarter cycle of an AC reference source, so that only one branch conducts current at a time. The DC voltage supplied to each branch and the conducting interval of each branch are such that equal energy dissipation occurs in each branch during each quarter cycle. To enable only one set of branches to be used for opposite polarity variations of the AC reference source, the current from all of the branches flows to a single node, then to opposite terminals of a center tapped transformer primary winding via a pair of switches. During first and second opposite polarity half cycles of the AC reference source, the first and second switches are respectively open and closed so that current flows in the transformer winding in opposite directions during the opposite polarity half cycles of the AC reference source. For a sinusoidal source e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.