Recently, a friend who runs a milk tea shop asked me: The store wanted to install a scrolling subtitle screen, but it was stuck with a power problem - if the wrong power supply is selected, the screen will either flicker or it will be scrapped after half a year of use. To be honest, you can’t be careless when choosing a power supply. Let’s break it up and talk about the trick today.

​​First look at these three life and death parameters​​
Choosing a power supply is like fitting glasses, and it’s useless to get the wrong degree. ​ ​Output voltage stability​ ​It must be controlled within ±0.2V, especially for screens powered by 5V. The voltage fluctuation exceeds 0.5V will accelerate the aging of the lamp beads. Last year, a convenience store bought a miscellaneous brand of power supplies at a cheap price, but in the end, two batches of lamp beads were replaced in half a year, and the repair cost was even more expensive than the screen.

​​30% of the power headroom must be reserved​ ​This golden rule must be engraved on your forehead:

• Screen with actual power consumption of 100W
• Select a power supply with a rated power of 130W
• Reduce calorie by 40%
• Extended service life by 2-3 years
  The actual data show that the power supply failure rate for operating at full load is 3.7 times the remaining margin, and this account is worth it no matter how much it is calculated.

​​There is a big pit hidden in the protection level​​
Don't be fooled by merchants to "proof of rain and dust", you have to stare at it​ ​IP65 certification​ ​look. A truly standard power supply must be:

1. Level 6 dustproof (completely prevents dust from entering)
2. Level 5 waterproof (low pressure water column impact will not affect)
3. Working temperature -20℃~50℃ (can withstand the temperature difference between north and south)
   A lesson learned from blood and tears: the rolling screen power supply in a supermarket in Northeast China did not undergo low temperature treatment, and went on strike directly at minus 15°C, and the promotional information was completely black.

​​Wire selection is very particular​​
The most easiest details for beginners to ignore:

• Copper core cross-sectional area ≥0.75mm² (anti-voltage attenuation)
• Flame-retardant outer layer (safety and fireproof)
• Resistant bending times ≥5000 times (must be required for frequent disassembly)
  The most outrageous case I have ever seen - using a network cable instead of a power cable, burning the driver IC in three months, losing tens of thousands of yuan.

​​Four-step method for practical inspection​​
Teach you how to inspect goods on the spot without stepping on the wrong side:

1. ​​Touch the temperature of the shell​ ​: After working for 1 hour, the temperature rises ≤15℃
2. ​​Listen to the running sound​ ​: Close to the ears without high frequency whistling
3. ​​Measure the output voltage​ ​: No load/load fluctuation <1%
4. ​​Check the certification mark​ ​: CCC+CE dual certification is indispensable
   This is how a restaurant chain brand is tested - they asked suppliers to carry power meters to test on-site, and 70% of bidders were eliminated.

Now I understand why some engineering companies would rather spend 20% of their budget than choose the original supporting power supply? For example, those screens exported to more than 110 countries, the power supply has undergone 48 hours of salt spray test + 2,000 plug-in and unplug experiments. Remember when choosing a power supply next time: those who dare to provide a three-year warranty and support on-site inspection are truly reliable. Those who stammer and refuse to read the quality inspection report should be blocked as soon as possible!

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