Abstract: A power adaptor (20) for a lighting unit (50) having a solid state light source (50a,50b,50c) is disclosed. The power adaptor (20) comprises an input (22) for connection to a mains power supply, a power transfer module (40a,40b,40c,140a) that is coupled to the input (22) and provides an output suitable for driving the solid state light source (50a,50b,50c), and a controller (30) that receives a voltage signal from the input (22) and is able to deliver a control signal to the power transfer module (40a,40b,40c,140a) for reducing the power drawn from the input (22). The power adaptor (20) draws current from the input (22) as a function of the voltage at the input (22) in order that the power adaptor (20) appears as a variable resistor to the mains supply.
Type:
Grant
Filed:
March 31, 2008
Date of Patent:
August 14, 2012
Assignee:
Hold IP Limited
Inventors:
David Thomas Summerland, Charles Pollock, Helen Pollock
Abstract: A power adaptor for a lighting unit, comprising an input for coupling to an electrical power supply and a controller adapted to monitor the input and operable to provide at least two independent electrical outputs; each output having a power level based on an amount of power available at the input. The independent electrical outputs may be used to supply and control an intensity and/or color characteristic of a solid state lighting unit; comprising at least two separately controllable colored emitters.