How to solve the heating problem of LED light strips

Reasons and solutions for heating of LED light strips

 We often use LED products in our lives, and LED light strips have been widely used in decoration and decoration in various fields in recent years. In many cases, they are required to work for a long time, which will cause them to be damaged due to long-term power on. fever. So what are the causes of fever and how to solve them after fever occurs? Let’s discuss them together.

1. Causes of heating of light strips

 There are many reasons for the heat of the light strip, including the following aspects:

1. Caused by LED heating

 LED is a cold light source that theoretically does not generate heat. However, in practical applications, due to imperfect electronic conversion and photoelectric conversion efficiency, a certain amount of heat will be generated to a certain extent, causing the lamp strip to heat up.

2. Poor heat dissipation of the light strip

 Poor heat dissipation of the light strip is also an important reason for the heat of the light strip. Poor heat dissipation of light strips is mainly caused by factors such as unreasonable wiring, poor radiator design, or blocked heat sinks. When the heat dissipation is not good, the light strip will overheat, resulting in a shortened life of the light strip.

3. The light strip is overloaded

 Overloading of light strips is also one of the reasons why light strips heat up. When the current the light strip withstands is too large, it will cause the light strip to overheat, causing the material to age, leading to short circuits, open circuits, etc.

 1. Circuit aspect: The most commonly used voltage specifications of LED light strips are 12V and 24V. 12V is a 3-string multi-channel parallel structure, and 24V is a 6-string multi-channel parallel structure.  LED light strips are used by connecting many lamp bead groups. The specific length of the light strips that can be connected has a lot to do with the width of the circuit and the thickness of the copper foil during design. The current intensity that a light strip can withstand is related to the cross-sectional area of ​​the line. You must pay attention to this when installing the light strip. If the connection length of the light strip exceeds the current it can withstand during installation, then the light strip will When working, it will definitely generate heat due to overloaded current, which will greatly damage the circuit board and reduce the service life of the light strip.

 2. Production: LED light strips are all series-parallel structures. When a short circuit occurs in one group, the voltage of other groups on the light strip will increase, and the heat of the LED will also increase accordingly. This phenomenon occurs most in the 5050 lamp strip. When any chip of the 5050 lamp strip is short-circuited, the current of the short-circuited lamp bead will double, and the 20mA will become 40mA, and the brightness of the lamp bead will also be reduced. It will get brighter and at the same time cause severe heat, sometimes burning the circuit board within a few minutes. Cause the LED light strip to be scrapped. However, this problem is relatively obscure, and generally it is unlikely to be noticed, because short circuit does not affect the normal lighting of the light strip, so few people check it regularly. If the inspector only checks whether the light strip emits light and does not pay attention to whether the brightness of the LED is abnormal, or only checks the appearance without conducting current detection, then the reason why the LED heats up will often be ignored, which will cause Many users say that the light strips become hot but cannot find any reason.

 Solution:

1. Choose a light strip with good heat dissipation performance

 When purchasing a light strip, you can choose a light strip with good heat dissipation performance, which can effectively reduce the problem of poor heat dissipation of the light strip and prevent the light strip from overheating and causing failure.

2. Make good heat dissipation design for the light strip

 For some places that need to be used for a long time, the heat dissipation effect of the light strip can be improved by adding radiators or heat sinks. The heat dissipation device can also be designed in the light strip design to effectively improve the heat dissipation capacity of the light strip.

3. Avoid overloading the light strip

 When using light strips, try to avoid overloading, choose appropriate light strips and power supplies, and conduct reasonable wiring to avoid long-term overloading of the light strips.

 1. Line design:

 Considering the current tolerance, the circuit should be designed to make the wiring as wide as possible. A 0.5mm spacing between lines is enough. It is best to fill up the rest of the space. In the absence of special requirements, the thickness of the copper foil should be as thick as possible, generally 1~1.5 OZ. If the circuit is well designed, the heating of the LED light strip will be reduced to a great extent.

 2. Production process:

 (1) When welding the lamp unit, try not to allow tin connections between the pads to avoid welding short circuits caused by poor printing.

 (2) The light strip should also avoid short circuit when patching, and try to test it before use.

 (3) Before reflow, first check the patch position, and then perform reflow.

 (4) After reflow, a visual inspection is required. After confirming that there is no short circuit in the lamp strip, conduct a power-on test. After power-on, pay attention to whether the LED brightness is abnormally bright or dark. If so, troubleshooting is required.

 This article analyzes the reasons for the heating of light strips and proposes methods to solve the heating problem of light strips. We hope it can help everyone better use and choose light strips and avoid failures caused by overheating of light strips.