Patent ID: 7402961
Filing Date: 2008-07-22
Classification: F21L,F21V,F21Y,H05B

Abstract:
1. A circuit for illuminating multiple light emitting devices, comprising: a current selector circuit connected across a positive terminal and a negative terminal of a DC supply for selecting operating current from the DC supply to each of a first array and a second array of the multiple light emitting devices (LEDs); a switching regulator circuit connected across an output of the current selector circuit for respectively regulating first and second constant drive currents to the first array of LEDs and to the second array of LEDs; a first array of LEDs coupled between a first output of the switching regulator circuit and a common current sense device; and a second array of LEDs coupled between the first output of the switching regulator circuit and the common current sense device; wherein a voltage signal generated by the common current sense device is coupled to a sense input of the switching regulator circuit for regulating the constant drive currents supplied to the first and second arrays of LEDs.