How to control the enclosure of LED display power supply and its challenges
Nowadays, the reform of power technology has become the top priority for the development of LED displays, so we need to understand the current challenges of power technology even more:
PCB circuit layout design. The weight of the LED display box affects the size of the power supply, so PCB board design needs to be minimized as much as possible, so there are also many factors to consider. Not only should we pay attention to safety distance, but we should also consider drilling, waterproofing and dust prevention, and sealing insulation glue. Indoor screens should pay more attention to heat dissipation, and the selection and distribution of heating elements are particularly important to avoid local temperature rise. Electronic devices should be kept away from heat sources to slow down aging and extend the lifespan of the power supply.
Product certification. At present, there is no certification standard for LED display screens in China, and relevant national departments are still studying and formulating it. The display screens sold domestically are still on the edge of control, while those exported are certified with CE or UL. In response to the current situation, it is quite difficult for the design of power equipment to meet all of the above certifications simultaneously. Developers need to spend a long time making technical adjustments to try to meet different certifications and meet customer requirements.
Component selection. When the internal product temperature of LED lights is at 50 degrees, the temperature rise generated by the power supply is basically around 20 degrees, while the temperature of the components may reach 70 degrees. High temperature conditions can cause parameter drift in some components, which may shorten their service life. Therefore, equipment must be selected that can work for a long time at high temperatures, such as electrolytic capacitors, wires, etc.
Electrical performance design. The power supply for LED display screens is mainly designed for constant current parameters. The magnitude of the current determines the brightness of the LED display screen. If the current error of the same batch of screens is large, the brightness of the screen will be uneven. And temperature changes can also cause the output current of the power supply to shift, so it is necessary to control the error of the same project display screen in order to ensure consistent brightness of the picture.
Power design. Although LED lighting has high efficiency, nearly 80% of the heat energy is still lost, causing the temperature of the module and the box to rise. LED display screens installed indoors will reach 50 degrees inside the box at room temperature. The power supply will work in a high-temperature environment for a long time, and to ensure its lifespan, it is necessary to increase the power margin.
Box heat dissipation. The LED display screen is a cold light source, and the working junction temperature cannot exceed the limit. The design of the enclosure should consider issues such as aesthetic appearance, easy installation, image quality, and enclosure heat dissipation, in order to produce products that meet customer satisfaction. The development time of LED display screens is not long, and the technical experience is not yet perfect, so there is not much technical knowledge that can be borrowed. Many manufacturers do not pay attention to heat dissipation when producing indoor LED display screens, often resulting in overheating of the box due to the small internal space or lack of ventilation structure, which affects the efficiency of the screen.
