Lighting arrangement

Patent metadata

Field	Value
Publication number	US-9693403-B2
Application number	US-201415107156-A
Country	US
Kind code	B2
Filing date	Dec 18, 2014
Priority date	Jan 2, 2014
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

The invention describes a low-power load arrangement ( 1 ) comprising a low-power load ( 3 ); a driver ( 2 ) for the low-power load ( 3 ); connectors ( 300 ) for connecting to an electronic transformer ( 2 ) realized for converting a mains power supply ( 4 ) to a power supply for a normal-power load ( 5 ); and a reverse current generating means (L P , SB) realized to provide a reverse current (I rev _ LP , I rev _ SB ) to sustain self-oscillation during operation of the electronic transformer ( 2 ), wherein the direction of current flow of the reverse current (I rev _ LP , I rev _ SB ) is opposite in direction to the output current of the electronic transformer ( 2 ). The invention further describes a lighting arrangement ( 1 ) comprising an electronic transformer ( 2 ) realized for converting a mains power supply ( 4 ) to a power supply for a normal-power load; a low-power load ( 3 ) connected to the electronic transformer ( 2 ), which low-power load ( 3 ) comprises a low-power light source ( 30 ); and wherein the lighting arrangement ( 1 ) comprises a reverse current generating means (L P , SB) realized to provide a reverse current (I rev _ LP , I rev _ SB ) to sustain transformer self-oscillation when the transformer ( 2 ) drives the low-power load ( 3 ), wherein the direction of current flow of the reverse current (I rev _ LP , I rev _ SB ) is opposite in direction to the output current of the electronic transformer ( 2 ). The invention also describes a method of driving a low-power load ( 3 ) with an electronic transformer ( 2 ) realized for driving a normal-power load ( 5 ).

First claim

The invention claimed is:

1. A low-power load arrangement comprising
a low-power light source;
a driver for the low-power light source;
input terminals ( 300 ) for connecting to a self-oscillating electronic transformer, wherein the electronic transformer is matched to a normal-power load and arranged to provide an output current; and
a reverse current generating means arranged to provide a reverse current whenever a voltage across the input terminals commutates during operation of the electronic transformer, the reverse current having a direction of current flow that is opposite to the output current of the electronic transformer thereby transferring energy to the electronic transformer so as to sustain self-oscillation of the electronic transformer, wherein the reverse current generating means comprises an inductor connected across the input terminals or a bridgeless synchronous boost converter.

2. A low-power load arrangement according to claim 1 , wherein the synchronous boost converter is realised to control a duration of the reverse current generated by the synchronous boost converter.

3. A lighting arrangement comprising the low-power load arrangement according to claim 1 , and the electronic transformer.

4. A lighting arrangement according to claim 3 , wherein the electronic transformer comprises a main transformer and wherein the reverse current generating means is realised to inject the reverse current into the main transformer.

5. A lighting arrangement according to claim 3 , wherein the electronic transformer comprises a pair of transistor switches, and wherein the reverse current is provided to augment and/or maintain the base current of the transistor switches.

6. A lighting arrangement according to claim 3 , wherein the reverse current is generated over at most one quarter of a switching cycle of the electronic transformer.

7. A lighting arrangement according to claim 3 , wherein the electronic transformer is realised for a driving a load with a normal rated power in the range of 20 W-60 W.

8. A lighting arrangement according to claim 3 , wherein the low-power light source is realised to consume power in the range of 3 W-6 W.

9. A lighting arrangement according to claim 3 , wherein the low-power light source comprises a number of light-emitting diodes.

10. A lighting arrangement according to claim 3 , comprising a dimmer preceding the electronic transformer.

Assignees

• Philips Lighting Holding Bv

Inventors

• Van Der Voort Ronald Hans
• De Bruycker Patrick Alouisius Martina
• Cvoric Dalibor
• Sauerlander Georg
• Arulandu Kumar

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• H02M5/458

  using semiconductor devices only · CPC title

• H05B45/10

  Controlling the intensity of the light · CPC title

• F21K9/23

  Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings · CPC title

• Y02B20/383

  Cross-Sectional Technologies · mapped topic