Power converter for led large area light source lamp

US7554822B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Eberhard Waffenschmidt · Aachen, DE
• Tom Neubert · Stolberg, DE

Key dates

• Filing date: Sep 27, 2005
• Grant date: Jun 30, 2009
• Expiry date: Jan 10, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02B70/10
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Power converter for receiving an input current at an input voltage and for providing an output current at an output voltage. The power converter comprises a transformer (133) having a primary (136) and at least one secondary (138) side, wherein the transformer shows a mutual inductivity Ls. The power converter further comprises at least one switching device (124a, 124b) being operated at an operating frequency fop at the primary side of said transformer, and a capacitor CS at the primary side of the transformer. The capacitor forms a resonant circuit with the leakage inductivity LS of said transformer, wherein said operating frequency, said capacitor Cs, said mutual inductivity Lm and said leakage inductivity LS are matched such that the effective value of the output current is substantially constant with respect to variations of a load being traversed by said output current by using resonance principles and operating the power converter in a current source mode.