LED Traffic Lights
LEDs have already replaced traditional incandescent lamps in traffic signal applications for their high efficiency, low power consumption and long life. LED Traffic Signals use both high brightness & high power LEDs connected in a combination of series and parallel to build a LED cluster. To realize specific luminous distribution intensity, an additional optical design (lenses) is necessary. If traffic signals are driven by AC power, an AC-DC circuit is required to convert AC to DC power that is suited for LED driver to drive LED cluster/string. MCU is used to implement the control over LED driver so as to give correct traffic signals.
Usually LED traffic signals are equipped with RS-485 port or wireless module (GPRS module) which is controlled by MCU to communicate with control center in a large area. In addition, as the green energy technology continues to evolve, some LED traffic signals are capable of utilizing solar energy as their power source by integrating solar panel and battery in power systems to capture and store the solar energy.