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US 5,321,373 AGranted
Combined differential-mode common-mode noise filter
AssigneeDigital Equipment Corporation
InventorsBoris I. Shusterman, Robert Curtis
Life of this patent
Estimating the term…
Abstract
An electromagnetic noise filter has a plurality of U-shaped wires passing through a ferrite core. Some of the wires are singly fitted in throughholes, whereas other wires are commonly fitted in throughholes. The wires can be interconnected to provide for impedance to both differential-mode and common-mode noise.
Claims6
A filter for attenuating electromagnetic noise in electronic circuits comprising:
- a magnetic core having a first portion and a second portion, a cavity formed in said first portion, a first and second throughhole formed in a said second portion, said first and second throughholes extending to said cavity;
- a first and second straight wire having terminal ends;
- means for connecting said terminal ends of said wires to the electronic circuits;
- said first wire fitted through said first throughhole and said cavity, said second wire fitted through said second throughhole and said cavity;
- said first and second wires in combination with said magnetic core providing an in-line inductor in series with a mutually coupled inductor for filtering differential-mode and common-mode noise in signal currents flowing through said first and second wires.
2 more elements
A method for attenuating electromagnetic noise in electronic circuits comprising the steps of:
- fitting a first wire in a first throughhole of a first portion of a magnetic core and a cavity of a second portion of said magnetic core, said first throughhole extending to said cavity;
- fitting a second wire in a second throughhole of said first portion and said cavity of said second portion of said magnetic core, said second throughhole extending to said cavity, said second portion surrounding said cavity;
- connecting one end of said first wire to a first side of a signal source;
- connecting another end of said first wire to a first side of a signal receiver;
- connecting a first end of said second wire to a second side of a signal source;
- connecting a second end of said second wire to a second side of a signal receiver;
- said first and second wires in combination with said magnetic core providing an in-line inductor in series with a mutually coupled inductor for filtering differential-mode and common-mode noise in signal currents flowing through said wires.
4 more elements
Dependencies are inferred from the claim text.