Power supply circuit for a subscriber's telephone set

Details Power supply circuit for a subscriber's telephone set Power supply circuit for a subscriber's telephone set

1978-08-10

1980-04-08

Konick, Bernard

179 77, 179 81R, H04M 1900

Patent

active

041974255

ABSTRACT:
A power supply circuit for providing a local power supply replenished from the exchange for a telephone instrument. An electrical energy storage device is connected in parallel with an impedance by a device providing a unidirectional transfer of electrical energy from a direct current path through the impedance. A by-pass circuit is connected in parallel with the impedance. The impedance is a zener diode, the storage device is a capacitor, the unidirectional transfer device is a diode, and the by-pass circuit is a transistor responsive to the state of charge of the capacitor. A trickle charge circuit is connected to transfer energy to the capacitor irrespective of the by-pass circuit and a speech-frequency by-pass circuit is in parallel with the zener diode. A switch responsive to on-hook/off-hook conditions is used to confine energy storage to off-hook periods.

REFERENCES:
patent: 3278823 (1966-10-01), Ross
patent: 3436639 (1969-04-01), Burkett et al.
patent: 3454860 (1969-07-01), Burkett et al.
patent: 3530366 (1970-09-01), Schwarm
patent: 4096439 (1978-06-01), Hochstein

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