source:other news release time:2023-08-02 Hits: Popular:led screen wholesaler
According to the electricity usage rules of the power grid and the characteristic requirements of LED drive power supplies, the following points should be considered when selecting and designing LED drive power supplies:
1. High reliability: Especially like the driving power supply of LED street lights, installed at high altitude, it is difficult to maintain and expensive.
2. High efficiency: The luminous efficiency of LED decreases with increasing temperature, so heat dissipation is very important. Especially when the power supply is installed inside the lamp
LED is an energy-saving product with high driving power efficiency, low power consumption, and low heat generation inside the lamp. It is beneficial to reduce the temperature rise of the lamp. Delay LED light decay.
3. High power factor: 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 a low power factor of a single electrical appliance with low power has little impact on the power grid, lighting up at night and concentrating similar loads can cause serious pollution to the power grid. It is said that in the near future, there may be certain requirements for power factor for LED driver power supplies with a power output of 30-40 watts.
4. Constant current output power supply method;
1) Multi channel constant current output, flexible combination of precision and leakage, one LED fault, does not affect the operation of other LEDs, and the cost is slightly higher.
2) Direct constant current power supply, LED series or parallel operation. The cost is lower, but the flexibility is poor. If one LED malfunctions, it will affect the operation of other LEDs.
These two forms coexist for a period of time. The multi-channel constant current output power supply method will have better cost and performance. Perhaps it is the mainstream direction in the future.
5. Surge protection: LED's ability to withstand surges is relatively poor, especially its ability to withstand reverse voltage. Strengthening protection in this area is also important. Some LED lights are installed outdoors, such as LED road boat and chaff bearing lights. Due to the activation of power grid loads and the induction of lightning strikes, various surges may invade the power grid system, and some surges may cause LED damage. Therefore, the LED driver power supply should have the ability to suppress the invasion of surges and protect the LED from damage.
6. Protection function: In addition to the conventional protection function, it is best to add negative LED temperature feedback in the constant current output of the power supply to prevent excessive LED temperature.
7. Protection: The external installation type of the lamp, the power structure should be waterproof and moisture-proof, and the shell should be sun resistant.
8. The lifespan of the driver power supply should match the lifespan of the LED.
9. To comply with safety regulations and electromagnetic compatibility requirements.
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