US 7,499,539 B2
Telephone line power supply
Michael A. Barrese, Middletown, N.J. (US); Brad L. Grande, Marlboro, N.J. (US); Vernon Glen Koll, Hazlet, N.J. (US); and Eugene Joseph Yurek, Hazlet, N.J. (US)
Assigned to Agere Systems, Inc., Allentown, Pa. (US)
Filed on Nov. 06, 2001, as Appl. No. 9/992,625.
Claims priority of provisional application 60/247368, filed on Nov. 09, 2000.
Prior Publication US 2002/0076038 A1, Jun. 20, 2002
Int. Cl. H04M 1/00 (2006.01); H04M 9/00 (2006.01)
U.S. Cl. 379—413 12 Claims
OG exemplary drawing
 
1. A power supply circuit for powering an electrical device using power from a telephone line, said circuit comprising:
a gyrator having an input coupled to the telephone line and an output;
an inductor having and input and an output;
an oscillator having an output;
a pulse circuit coupled to said oscillator and coupled between the output of said gyrator and the input of said inductor;
a converter coupled between the output of said inductor and the electrical device, said converter producing line power at an output; and
a combiner having a input coupled to a host power supply and an output coupled to the output of said converter, said combiner supplementing said line power with host power from said host power supply when the voltage level of said line power falls below a predetermined level.