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US 5,844,789 AGranted
Impedence regulator to block power line interference
AssigneeAT&T Corp.
InventorWoodson Dale Wynn
Life of this patent
Estimating the term…
Abstract
An impedance regulator system and method which offers a large effective high-frequency block to isolate RF signals transmitted on power lines is presented. High-current inductors in series are inductively coupled over the RF band to physically smaller, low-current coupling inductors. The coupling inductors induce a degenerative or canceling at RF frequencies in the high-current inductors, resulting in the effective inductor increase and hence higher impedance over the RF band.
Claims18
An impedance regulator, comprising:
- a first inductive element connected between a power supply and a power sink;
- and
- a second inductive element, inductively coupled to the first inductive element, which degeneratively couples to the first inductive element to reduce undesired RF noise components on one side of the regulator relative to the noise level on the other side of the regulator.
A method of regulating impedance, comprising the steps of:
- providing a first inductive element connected between a power supply and a power sink;
- and
- providing a second inductive element, inductively coupled to the first inductive element, which degeneratively couples to the first inductive element to reduce undesired RF frequency components on the power supply current side that arise in the power sink.
Dependencies are inferred from the claim text.