Select the LED
Von mademms, 09:54Select the LED drive power issues to consider
According to the power of the electric characteristics, characteristics of the LED and LED products, in the selection of LED driving power to consider the following points:
General principle
A, according to LED current and voltage characteristics, ideal is the use of a constant current drive. It can avoid the forward voltage of LED caused by changes in the current changes, at the same time constant current LED brightness stability.
B, in addition, LED flux varies inversely with temperature, so use should minimize the power heating and good heat dissipation system design. In order to reduce the working temperature of LED.
C, in order to ensure the service life of the whole LED LED section temperature must be controlled in a certain range.
1 high reliability
LED main products are LED chip and power, radiating shell, a control circuit. The LED power supply has a direct impact on product quality. Especially the LED street lamp products, as installed in the high altitude, inconvenient repair, repair costs are.
2 high efficiency
LED is an energy-saving product, drive power also should accord with the requirement of saving energy. Especially the power installed in the lamp structure, is particularly important. Because the luminous efficiency of LED with LED temperature rise and fall. Power supply efficiency is high, its power dissipation is small, the lamp heat is small, it reduces the lamp temperature rise. Can delay the LED lumen is favorable.
A 3 constant current driving mode
In order to meet the LED VI characteristics, so LED power must use constant current driving mode.
4 surge protection
LED anti-impact ability is rather poor, so to strengthen the protection of. Especially in outdoor products, because the network load startup and ray. Therefore LED driving power to suppress the surge intrusion protection, LED is not damaged the ability.
5 temperature protection function
Supply in addition to conventional protection function, preferably in a constant current output to increase LED chip temperature negative feedback, to prevent the LED chip PN section temperature too high.
6 LED power life
Driving power of life make the greatest efforts with LED chip and life.
7 work environment
Due to each of the local environment of the different LED lamps are to be considered: the workplace environment such as temperature, humidity, installation position.
Considering the power work, if not a soft start circuit, a transient current, the output will have a voltage spike. For better protection of LED, so it is necessary to add a soft start circuit. This is a driving power supply stability is a key factor.
According to the power of the electric characteristics, characteristics of the LED and LED products, in the selection of LED driving power to consider the following points:
General principle
A, according to LED current and voltage characteristics, ideal is the use of a constant current drive. It can avoid the forward voltage of LED caused by changes in the current changes, at the same time constant current LED brightness stability.
B, in addition, LED flux varies inversely with temperature, so use should minimize the power heating and good heat dissipation system design. In order to reduce the working temperature of LED.
C, in order to ensure the service life of the whole LED LED section temperature must be controlled in a certain range.
1 high reliability
LED main products are LED chip and power, radiating shell, a control circuit. The LED power supply has a direct impact on product quality. Especially the LED street lamp products, as installed in the high altitude, inconvenient repair, repair costs are.
2 high efficiency
LED is an energy-saving product, drive power also should accord with the requirement of saving energy. Especially the power installed in the lamp structure, is particularly important. Because the luminous efficiency of LED with LED temperature rise and fall. Power supply efficiency is high, its power dissipation is small, the lamp heat is small, it reduces the lamp temperature rise. Can delay the LED lumen is favorable.
A 3 constant current driving mode
In order to meet the LED VI characteristics, so LED power must use constant current driving mode.
4 surge protection
LED anti-impact ability is rather poor, so to strengthen the protection of. Especially in outdoor products, because the network load startup and ray. Therefore LED driving power to suppress the surge intrusion protection, LED is not damaged the ability.
5 temperature protection function
Supply in addition to conventional protection function, preferably in a constant current output to increase LED chip temperature negative feedback, to prevent the LED chip PN section temperature too high.
6 LED power life
Driving power of life make the greatest efforts with LED chip and life.
7 work environment
Due to each of the local environment of the different LED lamps are to be considered: the workplace environment such as temperature, humidity, installation position.
Considering the power work, if not a soft start circuit, a transient current, the output will have a voltage spike. For better protection of LED, so it is necessary to add a soft start circuit. This is a driving power supply stability is a key factor.
