The knowledges of LED power supply
According to the power grid rules and LED power supply characteristics of the requirements, in the selection and design of LED power supply need to take into account the following points:
1. High reliability. especially installed at high altitude, maintenance is not convenient, maintenance costs are also large.
2. High efficiency. LED is energy-saving products. For power supply installed in the structure of the lamp is particularly important because the LED luminous efficiency with the LED temperature rise and down, so the LED heat is very important. High efficiency, its power consumption is small, the heat in the lamp is small, it will reduce the temperature rise of the lamp, to delay the LED light failure beneficial.
3. High power factor. General 70 watts of the following appliances, there is no mandatory indicators.Although the power is not a small power factor of a single little power on the power grid is not big, but at night we light The load is too concentrated, will produce more serious pollution on the grid.For 30 watts to 40 watts of LED drive power, it is said that in the near future, may have a certain power factor indicators.
4. Two ways to drive now. one is a constant voltage source for a number of constant current source, each constant current source to each LED power supply alone. The other is a direct constant current power supply.
5 Surge protection. LED anti-surge capability is relatively poor, especially anti-reverse voltage capability. To strengthen this protection is also very important. Some LED lights installed in the outdoor, such as LED lights. Due to the load of the grid load and lightning Of the induction, from the grid system will invade a variety of surges, some waves will lead to damage to the LED. Therefore, LED drive power to suppress the intrusion of the surge to protect the LED is not damaged capacity.
6. The life of the LED power supply should be matched with the life of the LED.