Battery charger control circuit for telephone transmission syste

Details Battery charger control circuit for telephone transmission syste Battery charger control circuit for telephone transmission syste

1973-09-18

1976-07-06

Robinson, Thomas A.

179 25R, H04H 108, H04M 100

Patent

active

039683338

ABSTRACT:
A telephone transmission system in which a telephone transmission line connects a central office d.c. power source to a battery charging control circuit to apply an input voltage to the control circuit, in which a battery charger connects a rechargeable battery to said control circuit to draw battery charging current from the transmission line under the control of the control circuit, in which the control circuit is rendered effective by a lowering of the input voltage to at least a predetermined value to effectively disconnect the battery charger and the battery from the transmission line for a period that exceeds the interval in which the input voltage is lowered.

REFERENCES:
patent: 3780228 (1973-12-01), Stewart
patent: 3840703 (1974-10-01), Stewart

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