(2) High-efficiency LED is an energy-saving product, and the efficiency of driving power supply should be high. It is very important for the junction heat dissipation when the power supply is installed in the lamp. The efficiency of power supply is high, its power consumption is small, and the calorific value in the lamp is small, which also reduces the temperature rise of the lamp. It is beneficial to delay the light decay of LED.
(3) High power factor Power factor is the requirement of power grid for load. Generally, there is no mandatory indicator for electrical appliances below 70 watts. Although the power factor of a single electrical appliance with low power has little influence on the power grid, it will cause serious pollution to the power grid if it uses a large amount of lighting at night and the similar load is too concentrated. For the 30-40 watt LED driving power supply, it is said that in the near future, there may be certain index requirements for power factors.
(4) There are two driving modes: one is a constant voltage source for multiple constant current sources, and each constant current source supplies power to each LED separately. In this way, the combination is flexible, and the failure of one LED will not affect the work of other LEDs, but the cost will be slightly higher. The other is direct constant current power supply, that is, the driving mode adopted by "Zhongke Huibao", with LEDs running in series or parallel. Its advantage is that the cost is lower, but the flexibility is poor, and it is also necessary to solve the problem that one LED fault does not affect the operation of other LEDs. These two forms coexist for a period of time. Multi-channel constant current output power supply mode will be better in cost and performance. Maybe it is the mainstream direction in the future.
(5) The surge resistance of surge protection LED is relatively poor, especially the reverse voltage resistance. It is also important to strengthen protection in this respect. Some LED lights are installed outdoors, such as LED street lamps. Due to the switching-on and switching-off of power grid load and the induction of lightning strike, various surges will invade from the power grid system, and some surges will lead to the damage of LED. Therefore, it is analyzed that the driving power supply of Zhongke Huibao should be deficient in surge protection. As for the frequent replacement of power supply and lamps, the LED driving power supply should have the ability to restrain the invasion of surge and protect the LED from being damaged.
(6) In addition to the conventional protection function, it is best to add LED temperature negative feedback to the constant current output of the power supply to prevent the LED temperature from being too high; To meet the requirements of safety regulations and electromagnetic compatibility.