Careful friends in the charging time will notice that many of the charger above will be marked with DC and AC such words many friends do not understand what this means, today power adapter manufacturers to tell you what these words mean, by the way, and to popularize the principle of the charger work.
DC on behalf of the cell phone is direct current, also known as "constant current", constant current is a kind of direct current, is the size and direction of the constant direct current. Constant current means that the magnitude (voltage level) and direction (positive and negative) do not change with time (within a relative range).AC stands for alternating current. A current that makes periodic changes in intensity and direction with time is called alternating current, or AC for short The electricity we commonly use for lights, motors, and so on is alternating current.
At present, China's unified rated voltage of 220V, cell phone charger is equivalent to a small transformer, through the cell phone charger to 220V high-voltage pulse converted to 5V low-voltage pulse, and then through the conversion of the charger voltage regulator, directly into 5V DC, that is, the role of "constant voltage". Cell phone charger above the transformer out of the AC power, through the rectifier circuit and then converted to DC power to charge the cell phone, is DC power. This is the working principle of the cell phone charger.
In addition, the power adapter manufacturer also suggests that in order to charge the safety, in the choice of cell phone charger must choose the regular manufacturers of the charger!
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