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US 6,501,364 B1Granted
Planar printed-circuit-board transformers with effective electromagnetic interference (EMI) shielding
AssigneeCity University of Hong Kong
InventorsRon Shu Yuen Hui, Sai Chun Tang
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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.
Claims5
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.
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.
1 more element
A planar printed circuit board transformer comprising:
- 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.
Dependencies are inferred from the claim text.