How to deal with heat dissipation of LED lamp
Date:
2020-10-08

In our daily life, many places will use LED light belt. Like other light source lamps and lanterns, if the light belt is lighted for a long time, it will also generate heat. So, how to deal with the problem of lamp belt heating, let's have a look.


First of all, it is the cause of the lamp belt heating


The commonly used light strip specifications are 12V and 24V. 12V is 3 series parallel structure, 24 V is 6 series multiple parallel structure. Each type of light strip is specific due to the connection and use of LED strips. In the design, the length of the connection time is related to the width of the circuit and the thickness of the copper foil. The current intensity is also related to the cross-sectional area of the conductor. If the connection length exceeds the current that the conductor can bear during wiring, the lamp strip will be heated. If the heating time is too long, the service life of the circuit board and lamp belt will be affected.


How to deal with heat dissipation of LED lamp


LED light strip is a series and parallel structure. When a group of circuits is short circuited, the voltage of other lamp beads in the same group will increase, and the brightness of lamp beads will also increase, which will generate heat correspondingly, especially 5050 light strip. When any one of them is short circuited in the chip circuit, the current of other lamp beads will double, and the brightness of lamp beads will become super bright and super high, and the heat output will also be too high It will increase rapidly, and in serious cases, it will cause the circuit board to burn. However, these problems are usually not noticed, because the short circuit will not affect the normal lighting of the light strip. Generally, the testing personnel only pay attention to whether the lamp bead can be turned on. They seldom check the brightness abnormality or do not carry out the appearance inspection, but only carry out the electrical test, which often ignores this problem. This is why some lamps will heat up once they are lighted.


So how to deal with the heating of the lamp belt?


Firstly, the wiring in the circuit should be as wide as possible, and the distance between lines should be 0.5mm. The rest of the space should be full. The thickness of copper foil should be as thick as possible without violating the customer's requirements for the total thickness of the circuit board.


How to deal with heat dissipation of LED lamp


Then, when printing solder paste in the production process, try not to make continuous tin between pads, so as to avoid solder short circuit due to poor printing. Attention should also be paid to installation details to avoid short circuit. Check the position of the patch before reflow, and check the appearance after reflow to ensure that there is no short circuit in the light strip, and then conduct electrical test. When checking again, pay attention to whether the brightness of the lamp bead is abnormal.


If the final conditions permit, when using the light belt, the lamp belt can be allowed to have more time interval, so as to avoid overheating caused by the lamp belt working for a long time.


Of course, the use of LED light belt is inevitable heating, as long as we pay attention to do not produce short circuit and excessive work, we can avoid some accidents caused by overheating. Do not cover the outside of the lamp belt as far as possible, causing the situation that the heat can not be dissipated.


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