Patent ID: 6078148
Filing Date: 2000-06-20
Classification: G05F,H05B

Abstract:
A power supply and an array of light emitting diodes (LEDs (36)), the assembly comprising:a transformer (T1) having a primary winding and a secondary winding each having a plurality of turns (12 and 14),a plurality of taps (16, 18, 20, 22 and 24) for changing the number of effective turns (12 and 14) of one of the windings,an array of LEDs (36) for producing a luminous output in response to power supplied by said transformer (T1), anda controller (38) for automatically selecting one of said taps (16, 18, 20, 22 and 24) in response to an operating parameter of said LEDs (36) for maintaining the luminous output of said LEDs (36) above a predetermined level,said controller (38) including a measurement device (46) for measuring the temperature of said LEDs (36) as said operating parameter.