Electromagnetic interference shielding for small magnetic...

Electricity: electrical systems and devices – Safety and protection of systems and devices – Transformer protection

Reexamination Certificate

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C361S058000, C361S118000

Reexamination Certificate

active

06950291

ABSTRACT:
The present invention provides magnetic structure, particularly an isolation transformer, which includes a shield to prevent radiation of electromagnetic interference (“EMI”). The magnetic structure includes a support structure, or bobbin, on which are mounted windings formed from electrical conductors. The windings are electrically connected to termination points, which provide the electrical interconnections for the magnetic structure. A magnetic core can be included in the support structure to provide optimal magnetic properties to the device. An EMI shield formed from a metallic foil such as copper is wrapped around the winding to prevent the radiation of EMI. The EMI shield is connected to a shield pin in the support structure by a conductive strap such that the shield pin is electrically connectable to a fixed potential through a safety rated capacitor to provide a low impedance path for currents induced in the EMI shield. The magnetic structure is particularly useful as an isolation transformer in an isolated power supply.

REFERENCES:
patent: 3949290 (1976-04-01), Ochiai et al.
patent: 3963975 (1976-06-01), Gauper, Jr. et al.
patent: 4459575 (1984-07-01), Geissler et al.
patent: 5120258 (1992-06-01), Carlton
patent: 5304964 (1994-04-01), DiMarco
patent: 0 131 700 (1984-11-01), None
patent: 0 190 930 (1987-01-01), None
patent: 63002306 (1988-07-01), None
patent: 04297008 (1993-09-01), None

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