Electric field emission reduction system
US5534756A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1995 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Mar 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0015
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric field cancellation system comprises a sensor (30) for generating an input signal (I) indicative of an unwanted electric field (E) radiating from a source (3), a variable gain amplifier (5) for amplifying the input signal (I) to produce an output signal (O), a radiator for generating a cancellation electric field (C) in anti-phase to the unwanted field (E) in response to the output signal (O) to at least partially cancel the unwanted field (E), feedback means (10) for generating an error signal (F) indicative of tile difference between the cancellation field (C) and the unwanted field (E), and control means (40) for varying the gain of the amplifier (4) to vary the output signal (O) in response to the error signal (F).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.