LED Street Lighting

1. PF>0.9;
2. Power Efficiency > 85%;
3. Compliant with Energy Regulations;
4. Constant Current Output;
5. High Reliability;
6. Surge Protection;
7. Low Ripple;
8. Operation Temperature -40℃ - +70℃

The requirements list above indicates that a typical LED street lighting solution have the following modules - bridge-diode, PFC, isolated DC-DC converter, LED constant current controller，and LED fixture which includes LED, Lens & heat sink. Depending on the output power, PFC may operate in either Discontinuous Conduction (DCM)，Continuous Conduction (CCM) or Critical Conduction (DRM) mode. Generally, PFC has a stable 400Vdc output to feed the isolated DC-DC converter when the input is within the range from 90V to 264V. The Isolated DC-DC converter can be either fly-back or LLC type. For the LED lamps higher than 100W, the design theory of using CCM PFC or CRM PFC and LLC isolated conversion is commonly adopted. LED constant current control can be implemented by buck, boost or buck-boost topology.

The environment in which LED street lamps will be operating should obviously be taken into consideration to ensure that adequate protection is provided.

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