Patent ID: 8710757
Filing Date: 2014-04-29
Classification: H05B,Y02B

Abstract:
1. A power converter for an LED assembly, the power converter comprising: a switched mode power supply arranged to power the LED assembly; an AC/DC converter arranged to provide a variable DC supply voltage to the switched mode power supply; and powering the LED assembly, the control unit being arranged to control the AC/DC converter, in accordance with the required load voltage; wherein the control unit is arranged to control the AC/DC converter to provide the variable DC supply voltage at a level substantially matching or proportional to the required load voltage; wherein the AC/DC converter comprises a transformer arranged to provide a variable AC output voltage based on a control signal from the control unit; and a first rectifier for converting the variable AC voltage to the variable DC supply voltage; and wherein the transformer comprises a primary winding having multiple terminals connectable to an AC power source via a selector element, said selector element being controlled by the control signal of the control unit, and a secondary winding connected to the first rectifier.