Shanghai long Mao launched a series of city light dimming LED power supply solutions

Since the Ministry of science and Technology launched the Ten City million proposals, local governments have responded, to promote LED street lamp. The vast majority of the existing high-pressure sodium lamp is transformed into LED street lamp, so the original AC power supply circuit is also in urgent need of a number of commercial power supply LED street lamp. Although the general power supply LED street lamp also uses constant current power supply, but most do not have dimming function, however, even if the use of city power supply, how to further energy saving is also an important issue. To this end, Shanghai long Mao company and Hongkong Wei Tatsu company in close cooperation, the introduction of a series of city light dimming LED power solutions. Among the various solutions of 80W (100W), 112W (150W), 168W (200W), the number in parentheses represents the number of Watts used by the constant voltage source. All of these schemes use a constant voltage and constant current scheme to achieve the highest performance.

Take the 112WLED street lamp as an example, its block diagram is as follows.

One of the AC/DC constant voltage source used in Hongkong Weida company VP28SA150U constant voltage source. The maximum output power of 150W watts, the output voltage of 28V DC, the maximum output current of 5.36A. Its efficiency is as high as 92%, the power factor is as high as more than 0.99. The outline is shown in the photo.

The models and specifications of the AC/DC constant voltage source for other watts are shown in the following table:

Type No.

Output wattage

input voltage

output voltage

efficiency

Power factor

protect

VP32SA100U

100W

85-264VAC

32V (optional)

91.5%

Zero point nine nine

IP67

VP28SA150U

150W

90-264VAC

28V (optional)

92%

Zero point nine nine

IP67

VP28SA200U

200W

110-264VAC

28V (optional)

91%

Zero point nine nine

IP67

The output voltage can be based on the maximum voltage required by the LED load coupled with the 2-3V, so that the subsequent constant current drive source operates in the buck mode, and the highest efficiency is obtained.

The company is connected with the adjustable light buck constant current source SLM2842JD, which can accept the pulse width modulation (PWM) dimming signal. Its efficiency is as high as 97%. Here is used to drive 4x7 1W LED. A total of 4 such modules to drive a total of 112W LED. Dimming controller is used in the production of long Mao company SLM4801. According to the measured traffic flow in the area, the dimming controller can set the brightness of the controller at different time intervals. This controller can be started when the entire street lamp is switched on. Can also be measured according to their own photosensitive element, until the dark when the lights automatically. After adjusting the light, you can save more than 60%.

These programs have been adopted by the relevant enterprises, ready to use a few street lights go.