Deflection system with positive feedback
US4323825A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1980 |
| Grant date | Apr 6, 1982 |
| Priority date | — |
| Expiry date | Oct 6, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/64
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An electron beam deflection circuit useful in cathode ray tube displays which employ television scanning principles. The deflection circuit is characterized by transformer coupling between a source of horizontal drive signal and a switching transistor for the horizontal deflection coil. Energy stored in the transformer during the scan and retrace time is utilized during the scanning time to provide base current to the switching transistor. In addition, the transformer has a second primary winding connected in the emitter circuit of the switching transistor in a manner to allow positive feedback. The positive feedback enhances and sustains the base current during scanning time and controls its magnitude. The circuit is advantageous in that it eliminates the need for precise waveshaping circuits at the input to the switching transistor and lowers the power requirements for the circuits which precede the switching transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.