LED traffic signal with synchronized power pulse circuit
View Patent ↗An improved LED traffic signal is provided. The LED traffic signal suitably includes a housing with an opening, a printed circuit board coupled to the housing, and a power supply system coupled to the printed circuit board. The power supply system includes 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.
1. A power supply system o 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 module that generates a power pulse synchronized to the AC input voltage and representing a power consumption substantially equivalent to that of a halogen or incandescent traffic signal.
2. The system of claim 1 , wherein the synchronized power pulse has a fixed phase angle with respect to the line voltage independent of the AC line frequency.
3. The system of claim 1 , wherein the power supply further comprises: an input surge protection circuit, a fuse blow out circuit, an input EMI filter, a rectifier bridge, a safety circuit, a turn on/turn off circuit, an LED current detector circuit and a switching main power supply.
4. The system of claim 1 , wherein the LED load comprises at least one LED mounted on a printed circuit board.
5. The system of claim 3 , wherein the fuse blow out circuit comprises a switch adapted to create a short between an active and a neutral wire of the traffic signal.
6. The system of claim 3 , wherein the safety circuit is operative to blow out a fuse to disable a switch if no current flows through the LED load after a predetermined time when the switch is activated and/or the light out detector circuit detects less than a predetermined threshold light output.
7. An LED traffic signal comprising:
a housing with an opening;
a printed circuit board coupled to the housing;
a power supply coupled to the printed circuit board, the power supply comprising:
a power supply module that receives an AC input voltage from an AC input line and transforms it into DC voltage with a regulated current to power an LED load; and
a synchronized power pulse circuit connected to the power supply module that generates a power pulse synchronized to the AC input voltage and representing a power consumption substantially equivalent to that of a halogen or incandescent traffic signal.
8. The LED traffic signal of claim 7 , wherein the synchronized power pulse has a fixed phase angle with respect to the line voltage independent of the AC line frequency.
9. The LED traffic signal of claim 7 , wherein the power supply further comprises: an input surge protection circuit, a fuse blow out circuit, an input EMI filter, a rectifier bridge, a safety circuit, a turn on/turn off circuit, an LED current detector circuit and a switching main power supply.
10. The LED traffic signal of claim 7 , wherein the LED load comprises at least one LED mounted on a printed circuit board.
11. The LED traffic signal of claim 9 , wherein the fuse blow out circuit comprises a switch adapted to create a short between an active and a neutral wire of the traffic signal.
12. The LED traffic signal of claim 9 , wherein the safety circuit blows out a fuse to disable a switch if no current flows through the LED load after a predetermined time when the switch is activated and/or the light out detector circuit detects less than a predetermined threshold light output.
13. A power supply system for providing power to an LED traffic signal, the system comprising:
an LED load comprising at least one LED mounted on a printed circuit board;
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 module 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 has a fixed phase angle with respect to the line voltage independent of the AC line frequency.
14. The system of claim 13 , wherein the power supply further comprises: an input surge protection circuit, a fuse blow out circuit, an input EMI filter, a rectifier bridge, a safety circuit, a turn on / turn off circuit, an LED current detector circuit and a switching main power supply.
15. The system of claim 14 , wherein the fuse blow out circuit comprises a switch adapted to create a short between an active and a neutral wire of the traffic signal.
16. The system of claim 14 , wherein the safety circuit is operative to blow out a fuse to disable a switch if no current flows through the LED load after a predetermined time when the switch is activated and/or the light out detector circuit detects less than a predetermined threshold light output.
17. An LED traffic signal comprising:
a housing with an opening;
a printed circuit board coupled to the housing;
a power supply coupled to the printed circuit board, the power supply comprising:
a power supply module that receives an AC input voltage from an AC input line and transforms it into DC voltage with a regulated current to power an LED load comprising at least one LED mounted on a printed circuit board;
a synchronized power pulse circuit connected to the power supply module that generates a synchronized power pulse representing a power consumption substantially equivalent to that of a halogen or incandescent traffic signal.
18. The LED traffic signal of claim 17 , wherein the synchronized power pulse has a fixed phase angle with respect to the line voltage independent of the AC line frequency.
19. The LED traffic signal of claim 17 , wherein the power supply further comprises: an input surge protection circuit, a fuse blow out circuit, an input EMI filter, a rectifier bridge, a safety circuit, a turn on / turn off circuit, an LED current detector circuit and a switching main power supply.
20. The LED traffic signal of claim 19 , wherein the fuse blow out circuit comprises a switch adapted to create a short between an active and a neutral wire of the traffic signal and the safety circuit blows out a fuse to disable a switch if no current flows through the LED load after a predetermined time when the switch is activated and/or the light out detector circuit detects less than a predetermined threshold light output.