Overvoltage cut-off circuit of private exchange branch having ti

Details Overvoltage cut-off circuit of private exchange branch having ti Overvoltage cut-off circuit of private exchange branch having ti

1997-01-29

1999-07-27

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

361 56, 361111, 361127, H02H 100

Patent

active

059301015

ABSTRACT:
An over voltage cut-off circuit of a private branch exchange for cutting off the over voltage induced into an E&M (ear and mouth) tie line, includes an E ("ear") line over voltage cut-off circuit composed of an E arrestor which generates heat by the over voltage induced through the E port, and also of an E fuse which melts and blows if it surpasses a melting point. The circuit may also include an M ("mouth") line over voltage cut-off circuit. The M line over voltage cut-off circuit includes an E seizure signal detecting apparatus for detecting the input of a seizure signal to the E line, a switching apparatus switched to off-hook if the seizure signal is detected, or maintaining on-hook if not, and a discharging apparatus made up with an M fuse being opened due to the M arrestor's discharged heat if over voltage is induced through the M port in on-hook state, the over voltage being converted into an attenuation voltage by the M arrestor and discharged through the attenuation arrestor if it is induced through the M port in off-hook state.

REFERENCES:
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patent: 4903295 (1990-02-01), Shannon et al.
patent: 4979071 (1990-12-01), Ito et al.
patent: 5392328 (1995-02-01), Schmidt et al.

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