Electric power conversion systems – Phase conversion without intermediate conversion to d.c. – By dynamoelectric machine converter
Patent
1982-09-30
1984-04-24
Pellinen, A. D.
Electric power conversion systems
Phase conversion without intermediate conversion to d.c.
By dynamoelectric machine converter
363126, H04M 100
Patent
active
044450036
ABSTRACT:
A simplified combination of privacy circuit (U1) and holding circuit (U2) for use on a telephone subscriber loop (11). The circuit arrangement includes a diode array (31--34) within a conventional full wave rectifier bridge (21--24) having a pair of interchangeable terminals (28, 29) and a third differentiated terminal (39) for connection in the loop. The interchangeable terminals are connected in series with either the tip or ring conductor with the remaining terminal connected to the other conductor. The combination of diode array and bridge assures that, irrespective of the connection arrangement, the hold circuit always shunts the series combination of telephone and privacy circuit. A novel self limiting amplifier stage including a plurality of diodes (76) shunting the collector to emitter output of a transistor (90) is disclosed for injecting a music-on-hold signal when the hold circuit is active. Additionally, a capacitance (170) in the gate to cathode circuit of a thyristor (46b) in the hold circuit can be charged to a voltage exceeding the on state gate to cathode voltage. A path for discharging the capacitance (182) is provided when the thyristor momentarily shuts off during a momentary loop current interruption to retrigger the SCR solely through the gate to cathode circuit without the use of switching circuits connected to the anode side of the SCR.
REFERENCES:
patent: 3499121 (1970-03-01), McIntosh et al.
patent: 3514544 (1970-05-01), Chambers
patent: 3725601 (1973-04-01), Jetzt et al.
patent: 3742151 (1973-06-01), Ruether
patent: 3870831 (1975-03-01), McCarley
patent: 4000376 (1976-12-01), Springer
patent: 4039759 (1977-08-01), Taylor
patent: 4053720 (1977-10-01), Wycheck et al.
patent: 4075434 (1978-02-01), Merritt
patent: 4093829 (1978-06-01), Silherman
patent: 4169216 (1979-09-01), Overdulve
patent: 4258232 (1981-03-01), Smith et al.
patent: 4332983 (1982-06-01), Vakili
patent: 4351987 (1982-09-01), Feil
"General Electric SCR Manual" Copyrt. 1977; pp. 73-78 enclosed.
"Telephone Accessories you can build", Jules H. Gilder (Hayden, 1976), pp. 77-79, Article #17 Hold Button.
"More Telephone Accessories You Can Build", Jules H. Gilder (Hayden, 1980), pp. 3-5, Music on Hold; pp. 106-107, Priority Telephone.
George Keith E.
Pellinen A. D.
LandOfFree
Improved connection arrangement for connecting series and shunt does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Improved connection arrangement for connecting series and shunt , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Improved connection arrangement for connecting series and shunt will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-117189