Planar printed circuit-board transformers with effective electromagnetic interference (EMI) shielding
AssigneeCity University of Hong Kong
InventorsRon Shu Yuen Hui, Sai Chun Tang
Life of this patent
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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, in which shielding is provided by a combination of ferrite plates and thin conductive sheets.
Claims7
A planar printed circuit board transformer comprising at least one conductive sheet located over a ferrite plate, said plate being located over a winding, for electromagnetic shielding.
A planar printed Circuit board transformer comprising,
- (a) a printed circuit board,
- (b) primary and secondary windings formed by coils deposited on opposed sides of said printed circuit board,
- (c) first and second ferrite plates located over said primary and secondary windings respectively, and
- (d) first and second conductive sheets located over said first and second ferrite plates respectively.
A planar printed circuit board transformer comprising:
- primary and secondary winding,
- first and second ferrite plates located over said primary and secondary windings respectively,
- conductive sheets located over said first and second ferrite plates respectively for electromagnetic shielding.
A planar printed circuit board transformer comprising.
- (a) a first printed circuit board,
- (b) a primary winding formed by a coil deposited on said first printed circuit board,
- (c) a second printed circuit board,
- (d) a secondary winding formed by a coil deposited on said second printed circuit board.
- (e) first and second ferrite plates located over said primary and secondary windings respectively, and
- (f) first and second conductive sheets located over said first and second ferrite plates respectively.
A planar printed circuit board inductor comprising at least one conductive sheet located over a ferrite plate, said plate being located over a winding, for electromagnetic shielding.
Dependencies are inferred from the claim text.