Planar printed-circuit-board transformers with effective electromagnetic interference (EMI) shielding
First Claim
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1. A planar printed circuit board transformer comprising at least one copper sheet located over a ferrite plate, said plate being located over a winding, for electromagnetic shielding.
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Accused Products
Abstract
Novel designs for printed circuit board transformers, and in particular for coreless printed circuit board transformers designed for operation in power transfer applications, are disclosed in which shielding is provided by a combination of ferrite plates and thin copper sheets.
244 Citations
5 Claims
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1. A planar printed circuit board transformer comprising at least one copper sheet located over a ferrite plate, said plate being located over a winding, for electromagnetic shielding.
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2. A planar printed circuit board transformer comprising,
(e) a printed circuit board, (f) primary and secondary windings formed by coils deposited on opposed sides of said printed circuit board, (g) first and second ferrite plates located over said primary and secondary windings respectively, and (h) first and second copper sheets located over said first and second ferrite plates respectively.
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5. A planar printed circuit board transformer comprising:
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primary and secondary windings, first and second ferrite plates located over said primary and secondary windings respectively, copper sheets located over said first and second ferrite plates respectively for electromagnetic shielding.
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Specification