Rapid cutoff device and operation method for SCR AC switches
US9490801B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2014 |
| Grant date | Nov 8, 2016 |
| Priority date | — |
| Expiry date | May 28, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/136
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A rapid cutoff device includes a thyristor AC switch for supplying an AC current from a first AC circuit to a second AC circuit. A serially-connected circuit of a first switch and a first capacitor parallel-connects with the first AC circuit. A serially-connected circuit of a second switch and a second capacitor parallel-connects with the second AC circuit. When cutting off the thyristor AC switch, the first switch is operated to conduct the first capacitor in a first direction for the AC current charging to the first capacitor, alternatively, the second switch is operated to conduct the second capacitor in a second direction for the AC current charging to the second capacitor, thereby lowering a current in the thyristor AC switch approaching a zero value and thus rapidly cutting off it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.