Active solid-state devices (e.g. – transistors – solid-state diode – Regenerative type switching device – Combined with other solid-state active device in integrated...
Patent
1995-05-05
1997-12-09
Loke, Steven H.
Active solid-state devices (e.g., transistors, solid-state diode
Regenerative type switching device
Combined with other solid-state active device in integrated...
257120, 257121, 257123, 257132, 257157, 257173, 257175, 257355, H01L 2974, H01L 31111, H01L 2362
Patent
active
056963912
ABSTRACT:
A protection device against overloads that may occur on an interface between a telephone exchange and line switches connected to a subscriber's line, comprises a single protection circuit on the subscriber side of the line switches with respect to the interface. The overvoltage protection circuit ensures an overvoltage protection when the line switches are off, and an overcurrent protection when the switches are on. A controlled switch, disposed between each conductor and ground, is switched on in response to the detection of an overvoltage or overcurrent.
REFERENCES:
patent: 4456940 (1984-06-01), Hammerberg et al.
patent: 4475012 (1984-10-01), Coulmance
patent: 4695916 (1987-09-01), Satoh et al.
patent: 4847724 (1989-07-01), Renous
patent: 4849846 (1989-07-01), Hung et al.
French search report for French Patent Application Number 94/05925 filed May 9, 1994.
Loke Steven H.
Morris James H.
SGS-Thomson Microelectronics S.A.
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