Patent ID: 7116294
Filing Date: 2006-10-03
Classification: H05B,Y02B

Abstract:
1. A driver circuit for energizing a plurality of LEDs, said driver circuit comprising: a constant current source responsive to a first input to produce a current and connectable to an emitter comprising a plurality of LEDs, said constant current source configured to monitor an electrical current through the plurality of LEDs and limit said current to a predetermined value; a controller programmed to; a synchronization circuit electrically connected to a synchronization line, said synchronization circuit responsive to a change in the electrical potential present on the synchronization line from a first electrical potential to a second electrical potential to provide said synchronization input to the controller and responsive to said synchronization output from the controller to apply said second electrical potential to said synchronization line, wherein initiation of said pattern is triggered by the change of electrical potential on the synchronization line if said synchronization input is present before the controller produces said synchronization output and initiation of said pattern is triggered by the controller if said synchronization input is not present before the controller produces said synchronization output.