Planar transformer with boards

US8378775B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Wolfgang Schiene · Würselen, DE
• Georg Greuel · Roetgen, DE
• Marc Maria Alex Bleukx · Mechelen, BE
• Roman Schichl · Passau, DE

Key dates

• Filing date: Apr 17, 2008
• Grant date: Feb 19, 2013
• Expiry date: Apr 17, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F27/2804
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Transformers (1) for transforming primary signals into secondary signals comprise primary and secondary parts that comprise boards (11-14, 21-23) with turns. By introducing distances larger than zero between for example any pair of neighboring boards (11-14, 21-23), parasitic capacitances of the transformers (1) are reduced, and the secondary signals may comprise relatively fast/high voltage pulses having rise times >1 kV/μsec. To reduce proximity effects and any resulting losses, the primary and secondary boards (11-14, 21-23) may be stacked in interleaved ways. Such sandwich constructions reduce leakage inductances. In a particular direction, distances between subsequent primary boards (11-14, 21-23) and distances between subsequent combinations of primary and secondary boards (11-14, 21-23) are to be increased to further reduce capacitive losses in that particular direction. Relatively low voltage differences may be present between relatively close boards (11-14, 21-23), and relatively high voltage differences may be present between boards (11-14, 21-23) that are relatively far away from each other.