There are usually a series of labeled parameters on the power adapter, and few people pay attention to these parameters. This article will be based on the example, for everyone to analyze the power adapter in a value of the identification value beyond the input voltage range, is it really the factory standard error or there is another hidden inside? Here we will take a look with the small series!
A 27V/4A adapter has an input voltage range of 100-240VAC, but the plug of the power cord is labeled 250V/10A. The 250V is obviously beyond its own input voltage range. Why is this marked? And the adapter input voltage. What is the national standard requirement for the scope?
The 250V10A marked on the plug is actually the ultimate working condition of this plug. If there is no electrical equipment on the power outlet, the current is obviously zero. Then mark 250V10A, definitely not 10A. That is to say, the logo is 10A, which means "no more than 10A is allowed".
Usually, the power adapter's appearance standard is 100V-240V, and in the final factory test, the factory generally uses 85V-265V to carry out security check on the power adapter to ensure that there is no problem in working at 100V-240V. 27V, 4A means that the output voltage is nominally 27V and the maximum output is 4A (safe long-term operation).
I believe that by reading the above content, you will be able to analyze and troubleshoot the power adapter voltage abnormality in the actual operation. Although this problem is very basic, and even said that it is too simple, but for the learning process of power supply design, it is precisely this kind of analytical spirit.
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