Search International and National Patent Collections

1. (WO2017015964) DIRECT AC DRIVING CIRCUIT AND LUMINAIRE

Pub. No.:    WO/2017/015964    International Application No.:    PCT/CN2015/085597
Publication Date: Fri Feb 03 00:59:59 CET 2017 International Filing Date: Fri Jul 31 01:59:59 CEST 2015
IPC: H05B 37/02
Applicants: TRIDONIC GMBH & CO KG
TRIDONIC JENNERSDORF GMBH
LIN, Quentin
Inventors: LIN, Quentin
BAKK, Istvan
Title: DIRECT AC DRIVING CIRCUIT AND LUMINAIRE
Abstract:
A direct AC driving circuit an a luminaire for driving at least one LED (2), the driving circuit comprises a LED string (2') that comprises a series connection of at least two LEDs (2), wherein the LED string (2') is directly powered from a rectified AC mains voltage (4) and a LED string switching unit (1) that is configured to control at least one LED (2) shortening unit (1') that is arranged in parallel to at least one LED of the LED string (2'). The driving circuit comprises means configured to provide a low supply voltage which is also derived from the rectified AC mains voltage (4), wherein the low supply voltage is generated from unutilized voltage of the LED-string (2').