Several Key Points In LED Design And Application

- Dec 12, 2018-

LEDs have unique advantages, but LEDs are a fragile semiconductor product, so we must be careful when using LED products.

Should be powered by DC power

Some manufacturers use the "resistance-resistance and step-down" method to supply power to LED products in order to reduce the cost of products, which will directly affect the life of LED products.

Using a dedicated switching power supply to power LED products will not affect the service life of the product, but the product cost is relatively high.

Need to take anti-static measures

LED products must adopt certain anti-static measures during the processing and production process, such as the workbench should be grounded, workers should wear anti-static clothing, with anti-static ring and belt,Anti-static gloves, etc., can be installed with anti-static ion fan, and also ensure that the humidity in the workshop is about 65%, so as to prevent the air from being too dry to generate static electricity.Especially green LEDs are more susceptible to damage from static electricity.

Many static problems are caused by people's lack of ESD (electrostatic discharge) awareness, because most ESD damages occur outside of human feelings.Because the human body's perceived voltage for electrostatic discharge is about 3KV, many electronic components can be damaged at hundreds of volts or even tens of volts. Usually the electronics are damaged by ESD,After there is no obvious limit, the components are mounted on the PCB and then tested. As a result, many problems arise and the analysis is quite difficult.

LED temperature

It is important to note that an increase in temperature will cause the internal resistance of the LED to become smaller. When the ambient temperature rises, the internal resistance of the LED light source will decrease. If the power supply is stabilized, the LED will be caused.

The working current rises, when it exceeds its rated working current, it will affect the service life of the LED products, which will seriously cause the LED light source to “burn out”. Therefore, it is better to use a constant current source.Power supply to ensure that the operating current of the LED is not affected by the external temperature.