Linear low capacitance overvoltage protection circuit using a blocking diode
US7859814B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 2007 |
| Grant date | Dec 28, 2010 |
| Priority date | — |
| Expiry date | Sep 13, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/041
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A low capacitance overvoltage protection circuit (80) provides protection to a communication line (12, 14). A diode bridge (46) is connected to the communication line (12, 14) so that overvoltages of both polarities pass through an overvoltage protection device (44) in one direction. A bias voltage supply 48 applies a bias voltage across a semiconductor overvoltage protection device (44) through isolation resistors (64, 66) to make the capacitance of the device (44) independent of changes in communication line voltages. When line voltages exceed the magnitude of the bias voltage, a blocking diode (82) prevents current from flowing through the bias voltage supply (48) in a reverse direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.