The LED driving power supply room converts the power supply into specific voltage and current to drive the voltage converter of the LED judge. Generally, the input of LED driving power supply includes mains power, low-voltage DC, high-voltage DC, low-voltage high-frequency AC, etc. The output of LED driving power supply is mostly a constant current source that can change the voltage with the change of led forward voltage drop value.

Scheme of LED driving technology

According to the power consumption rules of power grid and the characteristic requirements of LED driving power supply, the following problems shall be considered when selecting and designing LED driving power supply.

1. High reliability. Because the driving power supply of LED street lamp is installed at high altitude, the maintenance is inconvenient and the maintenance cost is also large.

2. Driving method. At present, there are two driving methods: one is a constant voltage source for multiple constant current sources, and each constant current source independently supplies power to each LED. The other is direct constant current power supply, LED series or parallel operation. How to select the startup method shall be decided according to the actual needs. The multi-channel constant current output power supply method will be better in cost and performance. Maybe it is the mainstream direction in the future.

3. Surge protection. The LED driving power supply should have the ability to restrain the invasion of surge and protect the LED from damage.

4. Other elements. Improve the power factor of power supply; Add LED temperature negative feedback function; In terms of external protection, it shall be waterproof, moisture-proof and the shell shall be sun resistant; The longevity of the driving power supply shall match that of the LED; To meet the requirements of Safety specifications and electromagnetic compatibility.

Article from: LED fluorescent tube manufacturer http://www.jinleidj.com