Patent ID: 8723425

Claim:
A system for regulating power to an array of light emitting diodes, the system comprising: a power supply, supplying a supply voltage, coupled to the array of light emitting diodes; a current switch coupled to the power supply; a current limitation element coupled to the current switch; a current foldback element coupled to the array of diodes; a current sensing element, operably connected to the array of light emitting diodes, and capable of producing a signal indicative of the current through the array of light emitting diodes, and operably connected to the current limitation element; an energy controller, operably connected to the current switch and configured to sense the supply voltage, wherein when the supply voltage reaches an upper voltage limit, the energy control element produces a signal which deactivates the current switch; wherein the cycle of activation and deactivation current limitation and current foldback repeats across the period of the supply voltage, and the duration of current limitation and current foldback, and values of upper voltage limit, upper control limit and lower control limit are optimized to maximize heat dissipation within the array of light emitting diodes while maintaining a perception of maximum illumination.