Low Common-Mode Noise Planar Transformer
AssigneeNational Instruments Corporation
InventorMatthew Tate Dougan
Life of this patent
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Abstract
A planar transformer includes a core, a first circuit, a second circuit, and a primary conductive shield. The first circuit includes two or more primary windings that are stacked in two or more layers and are magnetically coupled to the core. The second circuit includes a rectifier circuit and two or more secondary windings that are magnetically coupled to the core. The primary conductive shield is stacked between a first primary winding of the two or more primary windings and a first secondary winding of the two or more secondary windings. The primary conductive shield reduces a capacitive coupling between the first primary winding and the first secondary winding.
Claims18
A planar transformer, comprising:
- a core;
- a first circuit comprising two or more primary windings that are magnetically coupled to the core, wherein the two or more primary windings are stacked in two or more layers;
- a second circuit comprising two or more secondary windings that are magnetically coupled to the core and a rectifier circuit;
- and
- a primary conductive shield stacked between a first primary winding of the two or more primary windings and a first secondary winding of the two or more secondary windings, wherein the primary conductive shield reduces a capacitive coupling between the first primary winding and the first secondary winding.
A planar transformer, comprising:
- a core;
- a first circuit comprising two or more secondary windings that are magnetically coupled to the core, wherein the two or more secondary windings are stacked in two or more layers;
- a second circuit comprising two or more primary windings that are magnetically coupled to the core and a rectifier circuit;
- and
- a secondary conductive shield stacked between a first primary winding of the two or more primary windings and a first secondary winding of the two or more secondary windings, wherein the secondary conductive shield reduces a capacitive coupling between the first primary winding and the first secondary winding.
Dependencies are inferred from the claim text.