Electricity: electrical systems and devices – Safety and protection of systems and devices – Transformer protection
Reexamination Certificate
2005-09-27
2005-09-27
Jackson, Stephen W. (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transformer protection
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.
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Andres Joao Luiz
Bell Michael Ray
Jackson Stephen W.
Lucent Technologies - Inc.
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