Current supply circuit for telephone exchange

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

H - Electricity

04

M

323/13, 379/63

H04M 19/00 (2006.01)

Patent

CA 1130940

ABSTRACT OF THE DISCLOSURE 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 amplifies 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.

336004

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