Power supply for an LED lighting unit

#This application is the U.S. National Phase application under 35 U.S.C. § 371 of International Application No. PCT/EP2019/081722, filed on Nov. 19, 2019, which claims the benefit of European Patent Application No. 18209506.7, filed on Nov. 30, 2018. These applications are hereby incorporated by reference herein.

#The invention relates to the field of LED lighting units, and in particular to power supplies for LED lighting units.

#Lighting units employing light emitting diodes (i.e. LED lighting units) are becoming increasingly common in light installations or luminaires, typically as a replacement for well-known halogen bulbs. LED lighting units typically comprise at least one LED arrangement, and are switchable between an ON-state, in which the LED arrangement(s) outputs light, and an OFF-state, in which the LED arrangement(s) does not output light.

#For a better understanding of the invention, and to show more clearly how it may be carried into effect, reference will now be made, by way of example only, to the accompanying drawings, in which:

#FIG. 1 is a circuit diagram illustrating a power supply according to an embodiment of the invention; and

#FIG. 2 is a block diagram illustrating a luminaire according to an embodiment of the invention.

#The invention will be described with reference to the Figures.

#It should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the apparatus, systems and methods, are intended for purposes of illustration only and are not intended to limit the scope of the invention. These and other features, aspects, and advantages of the apparatus, systems and methods of the present invention will become better understood from the following description, appended claims, and accompanying drawings. It should be understood that the Figures are merely schematic and are not drawn to scale. It should also be understood that the same reference numerals are used throughout the Figures to indicate the same or similar parts.

#According to a concept of the invention, there is proposed a power supply for an LED lighting unit. The power supply comprises two power converters, either of which may provide the power to be drawn by components of the LED lighting unit. In particular, a controller of the power supply controls which power converter converts a mains power supply to a power level for a connected LED lighting unit. The two power converters are designed to be efficient when providing different power levels.