Led light pole display how to improve heat dissipation

Led light pole display how to improve heat dissipation

At present, the LED light pole display screen is a segment of the LED display screen, and the application scenes are different, and the new requirements for the quality of the LED light pole video screen are put forward. Not to mention intelligent, service and system software, in terms of hardware, there are many different requirements, more than 7000nit brightness, high temperature above 80 °C, energy-saving, lightweight, beautiful, stable, anti-seismic, etc. are regular screens. A point that is less important, but it is a fundamental and essential requirement for LED light pole screens.

In fact, the LED light pole video display screen is all-metal structure, and the internal space is very small, and it is installed on the roadside, in the hot summer noon, especially in the south, under the sun exposure, even if it is not energized, the internal temperature It can also easily reach 80 °C. And this is a terrible and harsh application environment for an electronic product (including the CPU main control chip), so effectively controlling the internal temperature of the LED light bar screen is a systematic project, and at the same time, the LED light bar screen application is stable. The key is.

In addition, the LED light pole screen consists of a large number of resistors and capacitors, plastic connectors, cables, and power lines. These materials may melt at high temperatures and variability in performance, resulting in instability or serious failure of the entire equipment, and sometimes the resulting physical damage is irreparable, so the systematic solution to heat dissipation is important for LED light pole screens.

Therefore, in order to ensure the stable operation of the LED light pole screen, it needs to be solved from three aspects, one is less heat, the second is heat dissipation, and the third is high-temperature resistance above 80 °C.

Less fever is a key, so in order to reduce fever, we need to start from the following aspects:

1, using a power supply with high conversion efficiency;

2, the application of common cathode technology (ie 4.2V) drive;

3, the power supply should have a surplus of more than 30% (working in the linear area);

4, using 2153 type energy-saving drive IC;

5, LED lamp beads use large chips (ie 7000nit brightness);

6, using high-quality photoresistor to control brightness;

7, so that the temperature control fan can adjust the internal temperature at any time;

8, to achieve remote hard power off allows the device to have a long break.

In addition, the heat dissipation problem of the LED light pole screen is also a key point, and it needs to start from several aspects:

1, the air inlet from the bottom of the box should be as large as possible to ensure that there is enough air intake, and less dust;

2, the top air outlet should be large, and install as many fans as possible, so that the fan can ensure the temperature of the device can be controlled even if it is not working;

3, the box is made of all-aluminum structure with good thermal conductivity, also for faster heat conduction;

4, the internal wiring should be horizontal and vertical, to ensure that there is no dead space inside the cold air circulation.

The high temperature that can withstand 80 °C is also the basic requirement that the LED light pole screen must be done, and it still needs to start from several aspects:

1) The main control card can only use the single-chip microcomputer, which is simple but stable, and does not need too much memory, and does not need too many functions. It can meet the use of the LED light bar screen and is stable first.

2) The resistance and capacitance on the main control card should be military-grade and can withstand high temperatures. When the ambient temperature is 35 °C, the internal temperature of the cabinet may be around 70 °C, and the temperature of the main control card may reach 110 °C, so the main control card must be able to withstand high temperatures above 80 °C. This is what many companies don't know. Military-grade master cards are also much more expensive than ordinary control cards. Therefore, many companies often do not consider cost considerations.

3) The wire inside the cabinet should also be made of special materials that can withstand high temperature. Based on this consideration, our LED light pole screen products of Tailong Zhixian have been rehearsed since the establishment of the company.

It can be seen from the above analysis that the LED light pole display screen has high requirements for high-temperature resistance because of its small size and special application scenarios, and it is necessary to find the best solution from various angles.