High-voltage transformer protection circuit
US5119262A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1989 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Jul 26, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A protection circuit against an excessive current in a flyback transformer which supplies a high voltage to a CRT. A fuse and current detecting resistor are inserted on the line which supplies a current to the primary winding of the flyback transformer. The intermediate point of the primary winding and the node of the fuse and current detecting resistor are connected by a semiconductor switching element which becomes conductive when the voltage across the current detecting resistor reaches a certain high voltage. Accordingly, if an excessive current flows in the flyback transformer, the thyristor turns on, causing the fuse to be blown by the large current, whereby the current supply to the flyback transformer can be shut off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.