The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 24, 2002
Filed:
Oct. 04, 2000
Henrik Hellberg, Solna, SE;
Anders Emericks, Solna, SE;
Telefonaktiebolaget LM Ericsson, Stockholm, SE;
Abstract
To reduce power losses in a SLIC comprising first and second current amplifiers supplying line current to respective wires of a two-wire transmission line to a load, a line current detector detects line currents below a threshold value. For line currents above the threshold value, the second amplifier is supplied from a first battery with a substantially constant voltage. A voltage regulator is connected with its output terminal to the second amplifier, with its current supply terminal to a second battery of higher absolute voltage than said first battery, and with its input terminal to the detector. In response to line currents below said threshold value, the detector outputs control signals proportional to the detected line currents to control the output terminal of the voltage regulator to supply the second amplifier as well as the load from the second battery.