LED drive power supply is a power converter that converts the power supply into a specific voltage and current to drive LED lighting. Usually, the input of LED drive power supply includes high-voltage power frequency AC (ie mains), low-voltage DC, high-voltage DC, low-voltage high-voltage Frequency AC (such as the output of an electronic transformer), etc. The output of the LED drive power supply is mostly a constant current source that can change the voltage with the change of the LED forward voltage drop value.
1. High reliability Especially like the driving power supply of LED street lamps, it is installed at high altitude and has a waterproof aluminum shell driving power supply.
2. Driving methods There are two kinds of driving methods: one is that a constant voltage source supplies 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, with LEDs running in series or parallel. Its advantage is that the cost is lower, but the flexibility is poor, and it also needs to solve the problem of a certain LED failure without affecting the operation of other LEDs. These two forms coexist for a period of time. The multi-channel constant current output power supply method will be better in terms of cost and performance. Maybe the mainstream direction in the future.
3. Surge protection The ability of LED to resist surge is relatively poor, especially the ability to resist reverse voltage. Strengthening this protection is also important. Some LED lights are installed outdoors, such as LED street lights. Due to the start-up of the grid load and the induction of lightning strikes, various surges will invade from the grid system, and some of the surges will cause damage to the LED. Therefore, the LED drive power supply must have the ability to suppress the intrusion of surges and protect the LED from being damaged.
4. High power factor The power factor is the requirement of the power grid for the load. Generally, there are no mandatory indicators for electrical appliances below 70 watts. Although the power factor of a single electrical appliance with low power is low, it has little impact on the power grid, but everyone turns on the lights at night, and the same load is too concentrated, which will cause serious pollution to the power grid. For 30 watts to 40 watts of LED drive power, it is said that in the near future, there may be certain index requirements for power factor.