Parabolic voltage generating circuit
US4965495A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1990 |
| Grant date | Oct 23, 1990 |
| Priority date | — |
| Expiry date | Apr 30, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/233
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A parabolic voltage generating circuit includes an arrangement for generating a sawtooth vertical deflection current that flows in a vertical deflection winding, in a DC blocking capacitor and in a deflection current sampling resistor. An emitter electrode of a transistor is coupled between the deflection winding and the capacitor. A base electrode of the transistor is coupled between the capacitor and the resistance. A collector current of the transistor varies in a vertical rate parabolic manner and has a DC average value that is determined by a DC average value of a voltage that is developed in the capacitor. The collector current is applied to an East-West raster distortion correction circuit for modulating an amplitude of a horizontal deflection current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.