LED switching power supply selection and use matters needing attention

The high frequency of LED Switching power supply is the direction of its development. The high frequency makes the Switching Power Supply miniaturized and makes the switching Power Supply enter a wider application field, especially in the high-tech field, which promotes the miniaturization of high-tech products. Lightweight. In addition, the development and application of switching power supplies are of great significance in saving energy, saving resources and protecting the environment. So what should we pay attention to when selecting and using LED switching power supply?

1. Add a resistive load before the LED switching power supply leaves the factory. If it needs to be used as a capacitive or inductive load, it should be explained before ordering.

2. Sink leakage current: When multiple power supplies are in use, they jointly take in the same ground point. The total leakage current is composed of the leakage current of each unit. At that time, it is necessary to check the reliability of the protective ground wire and whether the ground resistance reaches Request to avoid electric shock.

3. In order to achieve the effect of sufficient heat dissipation, it is generally installed in a place with good air convection conditions or installed on the case shell to transfer heat through the case.

4. For users whose power supply FG is not grounded, it is normal to feel the numbness by touching the casing or output. When floating, FG has an AC output of about 110V to the ground, which is determined by the internal structure of the power supply.

5. The power line of the metal shell and the shell are generally connected to the ground (FG). It must be reliably grounded to ensure safety, and the shell should not be mistakenly connected to the zero line.

6. Definition of AC input power input power = output power / (input voltage * power factor * efficiency).

7. For dual-output symmetrical loads, symmetrical output power is preferred.

8. For high-power LED switching power supplies, there are generally three or more "+" input terminals and "-" output terminals. In fact, they are the same output electrode, just to make it convenient for users to connect multiple terminals They are connected together internally.

9. Before installation and power-on trial operation, please check and proofread the wiring on each terminal again, making sure that the input and output, AC and DC, single-phase and multi-phase, positive and negative, voltage and current values are undoubtedly correct Before it can be powered on.

Best Regards

Una Yang