Telephone ringing control circuits

Details Telephone ringing control circuits Telephone ringing control circuits

H - Electricity

03

K

379/10, 379/16,

H03K 17/60 (2006.01) H04M 1/31 (2006.01) H04M 3/02 (2006.01) H04M 19/04 (2006.01) H04M 19/06 (2006.01)

Patent

CA 1063742

ABSTRACT A single channel carrier system is disclosed including a remote terminal having a better charger for charging a battery during idle periods to power the remote carrier electronics. The remote electronics include a ringing generator and a supervisory circuit to implement normal telephone supervision over the carrier channel. The ringing generator is a dc-to-dc converter for stepping the battery voltage up to the ringing voltage level. In order to interrupt this unipolar ringing voltage and thereby to energize the telephone ringer, a switching circuit is provided including a transistor in shunt with the ringing voltage supply to provide a return path for alternate half cycles or ringing current A constant current source from a low voltage supply connected to the base of the transistor provides bias current to saturate the transistor yet minimizes the amount of dissipated power.

264236

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