Patent ID: 8294371

Claim:
A power supply system for providing power to an LED traffic signal, the system comprising: an LED load; a power supply module that receives an AC input voltage from an AC input line and transforms the AC input voltage into a DC voltage with a regulated current to power the LED load; and a synchronized power pulse circuit connected to the power supply that generates a synchronized power pulse representing a power consumption substantially equivalent to that of a halogen or incandescent traffic signal, wherein the synchronized power pulse circuit comprises: an input line frequency detector circuit that detects the frequency of the AC input line and generates a synchronized square wave signal; a line frequency synchronization circuit that converts the synchronized square wave signal to a voltage signal; a synchronized pulse width generator circuit that generates a switch gate command pulse; a synchronized switching pulse circuit that reduces the power consumption of the power pulse by reducing the duty cycle percentage of the gate command pulse; and a power pulse circuit module that sinks a current pulse.