Current supply circuit for telephone exchange

Details Current supply circuit for telephone exchange Current supply circuit for telephone exchange

1979-09-24

1982-02-09

Shoop, William M.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

G05F 144

Patent

active

043152066

ABSTRACT:
A current supply circuit for a telephone exchange is disclosed in which a current-supplying current amplifier series-connected between a power supply and a load amplifys an output current of an input current supply circuit, and a driving current amplifier for driving the current-supplying current amplifier is controlled by an output of an output voltage detector parallel-connected with the load in a negative-feedback fashion to set the differential mode output impedance of the current supply circuit at a large or small value in accordance with frequency and to set the common mode output impedance at a small value; and in which a part of the output voltage detector for connecting the load to the driving current amplifier includes a diode for preventing a direct current from flowing in a opposite direction to that of a direct current from the power supply in order to suppress, independently of the state of the load, a current which flows from the load side into the driving current amplifier, whereby an increase in current is restricted and an on-off control can be conducted in a short time without impairing an essential function of the current supply circuit.

REFERENCES:
patent: 3094654 (1963-06-01), Roelli
patent: 3504272 (1970-03-01), Kenny
patent: 3509448 (1970-04-01), Bland
patent: 4189670 (1980-02-01), Tanahashi

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