LED drive power supply to convert the supply of power supplies to a specific voltage current to drive LED light-emitting voltage converter, usually: LED drive power input including high-voltage frequency exchange (ie, mains), Low-voltage DC, high-voltage DC, low-voltage high-frequency communication (such as the output of electronic transformers).
And the output of LED drive power is mostly the constant current source which can change the voltage with the positive pressure drop value of the LED. LED power supply core components include switch controller, inductor, switch components (MOSFET), feedback resistors, input filter devices, output filter devices and so on.
According to the requirements of different occasions, but also have input overvoltage protection circuit, input undervoltage protection circuit, led open circuit protection, overcurrent protection circuits.
1, Characteristics of LED Drive power
(1) high reliability, especially like LED street lamp driving power, installed in the sky, maintenance inconvenient, maintenance costs are also large.
(2) High-efficiency LED is energy-saving products, driving the efficiency of the power supply. It is very important for the power supply to be installed in the lamp. The efficiency of the power supply is high, its power consumption is small, the heat in the lamp is small, and the temperature rise of the lamp is lowered.It’s good for slowing down the LED’s light decay.
(3) The power factor of high power factor is the requirement of power grid to load. General 70 Watts below the electric device, there is no mandatory indicator. Although the power of a small number of electrical power is not very small impact on the power grid, but the use of wholesale 400w led flood light at night, the same kind of load too concentrated, the network will produce more serious pollution. For the 30 Watts ~40 Watt LED drive power, it is said that in the near future, may have a certain index requirements for power factors.