System for detecting faulty SCR's
US4357645A · kind A · utility
6Cited by
8References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 13, 1981 |
| Grant date | Nov 2, 1982 |
| Priority date | — |
| Expiry date | May 13, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/263
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A safety circuit for a silicon controlled rectifier controller of the type wherein the current delivered to a load is determined by controlling the firing angle of the silicon controlled rectifiers. The safety circuit is capable of sensing a shorted condition in the silicon controlled rectifiers and automatically disconnecting the load from the AC mains in the event of such a short circuit condition. Load current is sampled at a time in the cycle where it is expected to be zero. If at the sampling time a non-zero condition is detected, a relay is made to operate to actuate a circuit breaker or to perform other desired functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.