Circuit for the compensation of current interference signals
US3935512A · kind A · utility
5Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1974 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | Dec 11, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/15
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit which compensates for interference signals when monitoring conditions such as overcurrents and the like in a larger network. The circuit includes a current-signal branch and a compensating branch, the latter fed with an interference voltage and containing a variable gain amplifier. Both branches of the circuit are coupled to a signal superimposing element in the form of a summing amplifier, the output of which is applied to a polarity comparator. The polarity comparator, which is three-state device, forms a portion of a feedback network for controlling the gain of the variable gain amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.