US Patent No. 10,219,334

CIRCUIT ARRANGEMENT FOR OPERATING SEMICONDUCTOR LIGHT SOURCES


Patent No. 10,219,334
Issue Date February 26, 2019
Title Circuit Arrangement For Operating Semiconductor Light Sources
Inventorship Olaf Busse, Munich (DE)
Alfons Lechner, Hohenwart (DE)
Siegfried Mayer, Moosinning (DE)
Horst Werni, Munich (DE)
Christof Schwarzfischer, Wackersberg (DE)
Assignee OSRAM GMBH, Munich (DE)

Claim of US Patent No. 10,219,334

1. A circuit arrangement for operating semiconductor light sources comprising:a power input for inputting an AC input voltage,
an output having a first output terminal, and a second output terminal, which is designed to connect a string of semiconductor light sources,
a control input for controlling the operation of the circuit arrangement with a control signal,
a rectifier circuit for converting the AC input voltage into a rectified voltage,
a converter circuit for transforming the rectified voltage into a current which is suitable for the semiconductor light sources,
a first switch arranged between the converter circuit and the output, for the switching of the current through the semiconductor light sources,
a first diode arranged between the first switch and the output, and
a second switch which is arranged between the converter circuit and the first output terminal, wherein the first switch is arranged between the converter circuit and the second output terminal.