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What is Power adapters

   Power adapter is a power supply converter for small portable electronic devices and electronic appliances, generally by the shell, Transformers, inductors, capacitors, control IC, PCB board and other components, its working principle from AC input into DC output, according to the connection can be divided into wall-type and desktop. Widely used in security cameras, set-top boxes, routers, light strips, massage apparatus and other equipment.

   The power adapter, also called an external power supply, switching power adapter ... etc. is a power supply voltage converter for small portable electronic devices and electronic appliances, and is common in small electronic products such as mobile phones, liquid crystal displays and laptops.

   Power adapter label, as shown in the figure, there are generally several items on the label of the power adapter that need attention. First, the model of the power adapter, such as the model of the power adapter is FY0681205000, it tells us a few information, is its manufacturers, the main parameters, FY is generally the company code, 068 is to explain this adapter PCBA's maximum output power of 68W, 1205000 indicates that the voltage is 12V, the current is 5000ma (5A), and the second is the input of adapter, which is generally 100-240v~50-60hz in the world, which means the power adapter can work under 100v-240v voltage.

power adapters

   The third is the output of the power adapter, two digits can quickly calculate the wattage of this power adapter , such as this power adapter, voltage 12v* current 5a=60w, indicating that this power supply is a 60W power adapter.

   Most laptop power adapters can be used for 100~240v alternating current (50/60hz). Basically most of the notebook computers are external power supply, with a power cord and host connection, which can reduce the size and weight of the mainframe, only a handful of models to the power supply built into the mainframe.

  There is a nameplate on the power adapter, which indicates the power, input and output voltage and current, especially the range of input voltage, this is called "Travel power adapter", if the mains voltage of only 110V countries, this feature is very useful. Some low-quality laptops are sold only in the origin, without this compatible voltage design, and can even accept a single input voltage of 110V, which will burn down in the 220V voltage usage.

1. What does the nominal voltage and current of the power adapter (power supply) mean?

First of all, the general power supply nominal voltage, refers to the open circuit output voltage, that is, no load outside, there is no current output voltage, so it can also be understood as, this voltage is the upper limit of the power output voltage.

   For the internal use of the active voltage regulator in the case, even if the mains voltage fluctuations, the output is also a constant value, such as the market on the general small transformers, such as Walkman, such as the power supply, if the mains fluctuation, the output of the power supply will not fluctuate.

   Generally speaking, the true no-load voltage of the ordinary power adapter is not necessarily the same as the nominal voltage, because the characteristics of electronic components can not be completely consistent, so there is a certain error, the smaller the error, the consistency of the requirements of electronic components higher production costs, so the price is more expensive. In addition, on the nominal current, regardless of any power supply has a certain internal resistance, so when the power output current, will be in the internal pressure drop, resulting in two things, one is to generate heat, so the power will be hot, the other is caused by output voltage reduction, equivalent to internal consumption.

 

2. are the same nominal voltage power supply, output current is different, can be used in the same notebook?

   Two Power supplies, with same output voltage and different output current, can be used on the same laptop. The basic principle is that the large nominal current  power supply can replace the power supply small nominal current power supply. It is estimated that some people think that a large nominal current will burn the notebook because the current is big. In fact, the current depends on the load under the same voltage. When the book high load operation, the current is bigger, when the laptop enters standby, the current is smaller, the large nominal current power supply has sufficient current margin. Conversely, someone uses 56w power supply instead of 72w also no problem, the reason is usually the design of the power adapter to leave a certain margin, the load power is less than the power supply adapter, so this substitution in general use is feasible, but the remaining power supply power margin is very little, once you have a lot of peripherals, For example, two USB hard drives, and then the CPU running at full speed, and then there is a base, the top of the CD-ROM drive full speed reading disk, coupled with the battery charge, it is dangerous, it is necessary to touch your hands at any time to know if the temperature can be boiled eggs or not. Therefore, you’d better not use a small current power supply instead of a large current.

   HF-FYD is a power supply manufacturer, Provide Qualified wall mount and desktop power adapter, 12v power adapter, switching power adapter for wholesals with cul/UL CB CE FCC SAA GS PSE KC/KCC Certified.

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