How many modes are there to control street lights?23-01-2023
LED lamps are directly connected to the AC grid. On the […]
LED lamps are directly connected to the AC grid. On the one hand, they are greatly affected by the grid, such as the EMC impact of the grid on the lamps and the impact of lightning strikes transmitted from the grid; on the other hand, each LED lamp needs EMC, rectification, power factor correction, Filtering, power drive, inverter step-down, regulated voltage output or re-regulated current output to LED light source. The circuit of the lamp control device is complicated, there are many components, and the cost of the lamp is high. And relatively speaking, safety and EMC issues are more prominent. These make the reliability of the LED lamp low and affect the life (for example, there are elements such as electrolytic capacitors that can withstand the grid voltage in the lamp).
Street lamps Suppliers are connected to the DC output terminal of the power module of the control cabinet. On the one hand, they are basically not affected by the EMC impact of the AC grid on the lamps and the impact of lightning strikes transmitted from the AC grid side (of course, it is still necessary to resist lightning strikes on the DC line The influence of the transmitted pulse); on the other hand, each LED lamp does not need EMC, rectification, power factor correction, filtering, power drive, inverter step-down and other circuits and components. The simple constant voltage type requires few auxiliary components, and it is better to directly output to the LED light source in series, or add a constant current circuit to output a constant current to the LED light source in series. In this way, the circuit of the lighting control device is very simple, the reliability is very high, and the service life can be very long, which is very beneficial for road and tunnel lighting projects with harsh environmental conditions. More complex intelligent DC LED lamps need to add intelligent receiving control circuit and internal intelligent control protocol program, the lamp control device has more components, the circuit is slightly more complicated, and the cost of the lamp is slightly higher. But compared to similar intelligent AC LED lamps, it is still much simpler, with higher reliability and longer life, which is still very beneficial for road and tunnel lighting projects.
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