According to the power grid rules and the characteristics of LED driver power requirements, LED driver power supply selection and design to take into account the following points:
1. High reliability: In particular, as the LED street lamp drive power installed in the high altitude, inconvenient to maintain, the cost of maintenance is also large.
2. High efficiency: LED is energy-saving products, higher efficiency of the drive power. It is especially important for the power supply to be installed in the luminaire. Because the luminous efficiency of LED drops with the increase of LED temperature, LED's heat dissipation is very important. The high efficiency of the power supply, its power consumption is small, the heat in the lamp is small, it reduces the temperature rise of the lamp. To delay the decline of the LED light.
3. High power factor: The power factor is the load on the grid. General 70 watts of electrical appliances, there is no mandatory indicators. Although the low power of a single electric appliance power factor has little effect on the power grid, but everyone lights, similar load is too concentrated, the power grid will have more serious pollution. For 30 watts ~ 40 watts LED driver power supply, it is said that in the near future, there may be some indicators of the power factor requirements.
4. This way, flexible combination, all the way LED failure, does not affect the work of other LED, but the cost will be slightly higher. The other is a direct current power supply, LED series or parallel operation. It has the advantage of lower cost, but poor flexibility, but also to solve a LED failure, does not affect the operation of other LED display accessories. Both forms co-exist over time. Multi-channel constant current output power supply, the cost and performance will be better. Probably the mainstream direction in the future.
5. Surge protection: LED surge immunity is relatively poor, especially anti-reverse voltage capability. It is also important to strengthen the protection in this area. Some LED lights are installed outdoors, such as LED street lights. Due to the rejection of grid load and the lightning strike, various surges will be intruded from the power grid system, and some of the surge will cause LED damage. Therefore, the LED driver power supply must have the intrusion of surge suppression, LED protection is not damaged.
6. Protection: power supply in addition to the normal protection, it is best to increase the constant current output LED negative temperature feedback, to prevent the LED temperature is too high.