universal power adapter

Power adapter is a small portable electronic equipment and electrical appliances, power supply conversion equipment, generally by the shell, power transformer and rectifier circuit, according to their output type can be divided into AC output and DC output type; according to the connection mode can be divided into wall mounted and desktop type. Extensive support in the telephone composite machine, game machine, language repeater, Walkman, notebook computers, cellular phones, etc. equipment.
In the power adapter (called adapter), a few of them are required to be noted. First, is the type of adapter, for example, a adapter model is XVE-120100, it tells us some information, it is the manufacturer, main parameters and so on, at the beginning of the XVE is ## code, 120100 is that the adapter is 12W, 050200 is 10W; second is the adapter of the INPUT (input) in general, China is generally 100-240V~50-60Hz, indicating that this adapter can 100V-240V voltage below normal work; third is adapter OUTPUT (output), two numbers can quickly calculate the number of tiles adapter, such as the adapter, voltage 12V* and current 1A=12W (power), the power supply is 12W adapter.
Most laptop power adapter can be used for 100 ~ 240V alternating current (50/60Hz). Basically, most of the laptop computer all the power supply, with a power cord and the host connection, so that the size and weight of the host, only a very small number of models in the host
What does the nominal voltage and current of the power adapter (hereinafter referred to as power supply)? First of all, the general power supply nominal voltage is the open circuit output voltage, that is, the outside is not connected to any load, there is no current output voltage, so it can be understood as the power output voltage is the upper limit.
For internal power supply using the active voltage stabilizing element, even if the fluctuations in mains voltage, its output is also a constant value, as the market general transformer, such as like the Walkman with power, if the city power fluctuation and the power supply output does not fluctuate of.
Generally speaking, the real no-load voltage 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 higher the consistency of electronic components, the higher the cost of production, so the price is more expensive.

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