Device for limiting the working voltage mechanical switches in telephony
US5448636A · kind A · utility
3Cited by
6References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1993 |
| Grant date | Sep 5, 1995 |
| Priority date | — |
| Expiry date | Feb 16, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/82
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Device for limiting the working voltage for mechanical switches in telephony includes terminals for connection to a telephone line, a connection and power supply branch for a control circuit extending from a first terminal, the branch having a first switch, the cathode terminal of a first Zener diode and the source terminal of a first MOSFET transistor being connected to the output terminal of the first switch, the gate terminal of the first MOSFET transistor being connected, through the anode terminal of the Zener diode, to the first terminal. The current absorbed by the device may be adjusted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.