Method and device for emitting mixed light colors

US7952784B2 · kind B2 · utility

Assignee

• Diehl Aerospace GmbH · DE

Inventors

• Eckhard Steffen · Burgthann, DE
• Till Kiewning · Winkelhaid, DE

Key dates

• Filing date: Sep 5, 2008
• Grant date: May 31, 2011
• Expiry date: Dec 2, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05B45/37
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

In order to avoid firstly decidedly periodic loading of an output-buffered constant current power supply unit (17) and secondly physiological loading as a result of only intermittently appearing primary colors (R, G, B) when activating mixed light color loci, primary color light sources (11R, 11G, 11B) are energized in pulse-width-modulated fashion periodically in a temporally offset manner, but in addition in each instance, in time-parallel fashion with respect thereto, also those primary color light sources of further primary color light sources (11R, 11G, 11B) whose primary colors in the cyclic activation are not being energized at that time are likewise energized in a pulse-width-modulated manner (FIG. 2). If, in addition, white light light sources (11W) are intended to be used, they are expediently in each case energized simultaneously with one of the primary color light sources (11R, 11G, 11B) and the other two of these primary color light sources, on the other hand, are energized in a temporally offset manner simultaneously in pairs.