Controlled emission static bar
US4423462A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1982 |
| Grant date | Dec 27, 1983 |
| Priority date | — |
| Expiry date | Jul 21, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T19/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A controlled emission static eliminator system (wherein an A.C. high voltage is applied to the discharge electrodes of a static bar by way of a transformer) employs a biasing circuit in series with the primary of the transformer to control the amplitude and/or duration of the alternating potentials imposed on the corona discharge points. The biasing circuit includes a series-connected diode and variable resistance in one leg of a parallel network and a capacitor in the other leg. Selecting appropriate time constants for the resistance and capacitance will narrow the first half of the sine wave and broaden the second half to produce an excess of positive or negative ions, as desired, depending upon the direction of the diode. The ion emission can be controlled to yield an equal number of positive and negative ions or a predominance of ions of one polarity and can be accomplished regardless of whether the A.C. high voltage is directly connected or capacitively coupled to the points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.