Talk about LED power supply.

With the characteristics of low energy consumption, long life, low calorific value and environmental protection, it has been widely used in many fields, such as:
1 lighting area street lamp, tunnel lamp, LED grating lamp, LED indoor lamp, LED lamp, etc.
2. Landscape lighting buildings, road Bridges, square building facilities, lawn lamps, curtain wall lamps, etc.
Used as backlight phone, computer, etc.
4 information plane display panel, dynamic billboard, simulation animation, sports stadium, industry and commerce, other industries, etc.
The indicator light inside the car and inside reading light, brake light outside the car, taillight, turn signal, side lamp, etc.
The application of explosion-proof lamps in special fields, mining lamps in mining production, etc.
LED is a light-emitting diode with diode characteristics, which can only be charged in one direction. Usually LED brightness output is proportional to the current by LED, but white LED in the big electricity flow saturation phenomenon appears, luminous efficiency greatly reduce, or even failure, so LED to use current rating should not exceed its specifications. In addition, the LED brightness output is inversely proportional to the temperature, so it should be used to reduce the heating and design good cooling system.
Currently, leds are all dc driven, so there is a need to add a power adapter, LED power supply, between the city and the LED. Its function is to convert the ac city power into a direct current of the appropriate LED. According to the electricity regulation of the power grid and the driving characteristics of the LED, the following points should be taken into consideration when selecting and designing the LED driver power supply:
1. The high reliability is especially like the driving power of LED street lamp. It is installed in high altitude, and the maintenance is inconvenient and the cost of maintenance is large.
2. High efficiency LED is energy-saving product, the efficiency of power supply is high. It is very important for the power supply to be installed in the lamp. Because the LED's luminous efficiency decreases with the rise of LED temperature, the heat dissipation of LED is very important. The efficiency of the power supply is high, its loss power is small, the heat inside the lamp is small, also reduce the temperature rise of lamps and lanterns. It is advantageous to delay the light attenuation of LED.
3. The power factor of high power factor is the load requirement of the power grid. General 70 watts below the use of electrical appliances, no mandatory indicators. Although the low power factor of a single electric appliance has little effect on the power grid, in the evening, people light the light, and the same kind of load is too concentrated, which will cause serious pollution to the power grid. It is said that in the near future, there may be some index requirements on power factor for the LED power supply of 30 watts ~40 watts.