Light source module, power supply unit for operating a light source module of this kind, and lighting system

US9521714B2 · kind B2 · utility

Assignee

• OSRAM GmbH · DE

Inventors

• Felix Franck · Hersbruck, DE
• Markus Heckmann · Munich, DE

Key dates

• Filing date: Sep 24, 2014
• Grant date: Dec 13, 2016
• Expiry date: Sep 24, 2034

Classification

• Technology area (CPC —): General

Abstract

A light source module may include at least one LED cascade with a plurality of LEDs, a supply line, wherein at the input side the LED cascade is coupled thereto, and a ground line. The light source module further includes a communications line for coupling to a control device for the current to be provided by the current source, a thermal derating unit coupled between a first voltage source and the communications line and including a temperature-sensitive element, wherein the thermal derating unit applies a temperature dependent current component determined depending on the temperature-sensitive element, to the communications line, at least one current measurement resistor connected in series between the LED cascade and the reference potential, wherein the conductance of the current measurement resistor is proportional to the current requirement of the LED cascade, and at least one coupling resistor coupled between the coupling point and the communications line.