According to the rules of grid electricity and the characteristics of the LED drive power requirements, the power of the LED driver in the selection and design to take into account the following nine performance characteristics requires:
1, high reliability, especially as the drive power of the LED lights, installed at high altitude, inconvenient repairs and maintenance spend.
2, High efficiency, LED energy-saving products, the efficiency of the drive power to high. Is particularly important for the structure of power supply installed in the fixture. LED luminous efficiency of LED temperature decreases, so the led driver 120w heat dissipation is very important. High efficiency power supply, the loss power, heat lamps, and reduces the temperature rise of the lamps. Beneficial to delay the LED light failure.
3.High power factor, power factor is the grid load requirements. Appliances generally less than 70 watts, there is no mandatory targets. Power is not a single electrical power factor on the grid has little effect, but at night we light a lamp, focus too much on similar load, the grid will produce a more serious pollution. 30 watts to 40 watts of LED Floodlight 80W , said that in the near future, will power factors may have certain specifications.
4, drive mode, now common, there are two: one is a constant voltage source for the constant current source, each constant current source separately to each LED power supply. In this way, the combination of flexible, all the way to the LED fault, does not affect the other LED's work, but the cost will be slightly higher. Another is a direct constant current power supply, LED in series or parallel operation. Its advantage is low cost, but the flexibility is poor, but also to solve a LED fault, does not affect other LED running. These two forms co-exist within a certain period of time. Multi-channel constant-current output power supply, in terms of cost and performance. May be a future direction of the mainstream.
5. Industry LED Flood light 10W reliability with low main reasons are the following:
First, near heat sources.
LED luminous efficiency higher, but the energy flow through the LED is still only a small part of the energy can see the form of light radiation out most of the remaining energy in the form of heat consumption in the LED, the LED light source fever more serious. LED driver inside the lamp is usually placed near the LED Power Supply source in the environment temperature is only 20-30 ° C room temperature, drive around the ambient temperature can easily reach 50-60 ° C, the drive to ensure that such a high ambient temperature the reliability of the design (especially the efficiency index) has a big challenge.
Second, long-term work at full capacity.
The case of non-dimming LED driver is close to full capacity in most of the switching power supply applications, such as computer power supply (adapter), communications, power, household appliances and other long-term average power is usually only rated power power fraction of the full power state, all loads are turned on only a select few within the time will appear.
Third, roads, squares and other outdoor lighting situations, vulnerable to damage to the outside world by lightning and other natural phenomena. All these will cause large-scale application of LED semiconductor illumination ills of post-maintenance series.
The high reliability of the LED Spotlight 30W LED product quality, but also the urgent need to break the technical difficulties.