Supply assembly for a LED lighting module

Abstract

A supply assembly for a LED lighting module, comprising a supply unit to which the LED lighting module can be connected and a burst control unit which is capable of switching the power supply unit on and off with a burst frequency (fburst) so as to control the mean light output. Preferably, the burst control unit is provided with a pulse duration modulator for controlling the pulse length (T pulse) during which the supply unit is operative.

1 . A supply assembly for a LED lighting module, comprising a supply unit to which the LED lighting module can be connected and a burst control unit which is capable of switching the power supply to the LED lighting module on and off with a burst frequency (fburst) so as to control the mean light output of the LED lighting module, characterized in that the burst control unit is capable of switching the supply unit on and off with the burst frequency (fburst).  
     
     
         2 . A supply assembly as claimed in  claim 1 , characterized in that the burst control unit comprises a pulse-duration modulator which is capable of controlling the length (Tpulse) of the pulses during which the supply unit is in the on-state.  
     
     
         3 . A supply assembly as claimed in  claim 1  or  2 , characterized in that the supply unit is a controlled constant-current source.  
     
     
         4 . A supply assembly as claimed in  claim 1 ,  2  or  3 , characterized in that the supply unit is a high-frequency switch mode power supply which supplies a ripple DC current or a ripple DC voltage.  
     
     
         5 . A supply assembly as claimed in  claim 4 , characterized in that the pulse duration modulator can switch the converter on and off with the burst frequency (fburst).  
     
     
         6 . A supply assembly as claimed in  claim 4  or  5 , characterized in that the ripple frequency of the converter is an integer multiple of the burst frequency (fburst), and the ripple DC voltage or ripple DC current can be synchronized with the burst control signal.  
     
     
         7 . A supply assembly as claimed in any one of the preceding claims, characterized in that the burst frequency (fburst) is an integer multiple of the frequency of the mains voltage to which the supply assembly can be connected, and the burst control signal can be synchronized with the mains voltage signal.  
     
     
         8 . A supply assembly as claimed in any one of the preceding claims, characterized in that the burst frequency (fburst) lies in the range between 50 and 200 Hz or above 20 kHz.  
     
     
         9 . A supply assembly as claimed in any one of the preceding claims, characterized in that the burst frequency (fburst) is 100 or 120 Hz.  
     
     
         10 . A supply assembly as claimed in any one of the preceding claims, characterized in that the current (ILED) supplied by the supply unit in the on-state to the LED lighting module is a constant current which has been chosen as a nominal current, and which results in an optimum light output of the LED lighting module.