LED driver design points

　　Due to the characteristics of LED driver requirements in the selection and design of LED driver to consider the following points:

　　1, high reliability

　　Especially as the drive power LED lights , installed at high altitude , maintenance convenient, cost of maintenance is also large.

　　2, high efficiency

　　LED energy-saving products, drive power efficiency is higher . For the structure of the power supply installed in the luminaire , is particularly important. Because the LED luminous efficiency LED temperature increases with decrease , so the heat LED is very important. High-efficiency power supply , its small power consumption , heat lamps in small, will reduce the temperature of the lamp . Advantageous to delay the LED light failure .

　　3 , high power factor

　　Power factor is the power to the load requirements. Generally less than 70 watts of electrical appliances , there is no mandatory targets . Although it is not a single low-power electrical power factor with little impact on the grid, but at night we light up , like the load is too concentrated, the grid will produce more serious pollution. For the 30 -watt and 40 -watt LED driver power supply , it is said in the near future , and perhaps would have certain power factor index requirements .

　　4, Driver Method

　　Now prevailing in two ways: one is a constant voltage constant current source for a number of sources, each current source for each LED individually powered . In this way, the combination of flexible , all the way LED failure does not affect other LED 's work, but the cost will be slightly higher . The other is a direct constant current power supply , LED in series or parallel. Its advantages are low cost little, but the flexibility is poor, but also to solve a LED failure , the problem does not affect other LED running . These two forms exist in a period of time. Multi-channel constant current output power supply, in terms of cost and performance will be better. Perhaps the future direction of the mainstream .

　　5 , Surge protection

　　LED surge capacity is relatively poor , especially against reverse voltage capability. Strengthen the protection of this area is also very important. Some LED lights installed in the outdoors, such as LED lights. Since the start grid load rejection and lightning induction , from the grid system will invade a variety of surge , the surge will cause some damage to the LED . Therefore, LED drive power surge suppression have invasive ability to protect LED is not damaged .

　　6 , Protection function

　　In addition to regular power protection features , the best increase in the constant current output LED temperature negative feedback to prevent LED temperature is too high .

　　7 , IP aspects

　　Outside lighting installation type , the power structure to be waterproof, moisture-proof shell to Fast .

　　8 , The life of the drive power to be adapted to the LED life .

　　9 , To comply with safety regulations and electromagnetic compatibility requirements.

　　With the increasingly widespread application of LED performance LED driver for LED power supply will increasingly demand.