Briefly describe how to solve the heating problem of led light strips
1. Circuit design problem:
At present, the commonly used specifications of led project light strips are 12V and 24V. 12V is a 3-series multi-channel parallel structure, and 24V is a 6-string multi-channel parallel structure. Since the led light strips are to be connected and used, each light strip is specific. How long it can be connected has a lot to do with the width of the line and the thickness of the copper foil when designing. Because the current intensity that the unit area can withstand is related to the cross-sectional area of the line, if this is not taken into account when wiring, then when the connection length exceeds the current that the line can withstand, the light strip will be damaged due to overcurrent. Heating, while damaging the circuit board, also reduces the service life of the LED.
2. Production process problems:
Since the LED engineering light strip is a series-parallel structure, when a short circuit occurs in a certain group of circuits, the voltage of other LEDs in the same group will increase, the brightness of the LEDs will increase, and the corresponding heat will also increase with the rise. It is obvious that in the 5050 light strip, when any chip circuit of the 5050 light strip is short-circuited, the current of the short-circuited light bead will double, that is, 20mA becomes 40mA, and the brightness of the light bead will increase. It becomes very bright, but at the same time, the heat generation will increase sharply, and it will burn the circuit board in a few minutes. However, because this problem is relatively obscure, it is generally not paid attention to, because the short circuit does not affect the normal lighting of the light strip. If the staff in charge of the test only pays attention to whether the LED is emitting light, but does not check the abnormal brightness, or does not do Visual inspection, if only electrical test is done, this problem is often ignored, which is why many LED light strip manufacturers always encounter customer complaints that the product is hot but can't find the reason.
Solution:
1. Circuit design: The circuit should be as wide as possible, the spacing between the circuits should be 0.5mm, and the rest of the space should be fully filled. The thickness of the copper foil should be thickened as much as possible without violating the customer's requirements for the total thickness of the circuit board, and the general thickness is 1~1.5 OZ.
2. Production process:
A. When printing solder paste, try not to allow tin connection between the pads to avoid soldering short circuits caused by poor printing.
B. Avoid short circuit when patching.
C. Check the patch position before reflow.
D. After the reflow, do a visual inspection to ensure that the light strip is not short-circuited, and then do an electrical test review. During the review, pay attention to whether the LED is abnormally bright or abnormally dark after lighting.
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