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A charger is a common charging device that converts electrical energy into DC energy and outputs the electrical energy to electronic devices such as cell phones, tablets, digital cameras, etc. through a USB cable that connects the charger to the electronic device, thus enabling the charging process. The charger does not require the use of a computer or other device to charge, it simply needs to be plugged into a wall outlet.

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Description

Advantages and disadvantages of switching power supply(A), advantages:
1, higher efficiency, small size. As the switching power supply voltage control is the use of power semiconductor devices by adjusting the saturation area of his turn-on time or frequency, so there is no iron loss and copper loss, the loss of components can be negligible, compared to the transformer power supply is more efficient; because it is only components and circuit boards, and thus the volume will be small, lighter weight.
2、Wide voltage input range. Generally can reach between 160V-270.
3, the output voltage is extremely accurate, the general error is between plus or minus 0.1 ~ 0.5V. The following test chart, the output voltage is marked as 12V, the actual output voltage measured by a multimeter is 12.27V, a difference of only 0.27V.
Switching power supply voltage error is very small

(B), disadvantages:
1, switching power supply looks small, power and core transformer and control method, electromagnetic interference, ripple coefficient is large.
2, the design is complex, maintenance and repair is not convenient. Often the more complex the device the greater the possibility of problems, and once the switching power supply problems, the general non-professionals can not repair.
3, small size is the advantage of switching power supply, but poor design has become its disadvantage. In pursuit of smaller, a large number of components crammed into a small shell, heat dissipation is not good, there will be deformation of the shell phenomenon.
4, switching power supply components in the selection is not very standardized, which is a common problem of domestic switching power supply. The relevant state quality inspection departments to test the market for switching power supply found that more than half of the failed, which also includes imported switching power supply.
5, the biggest point is the ability to resist lightning strikes is very low, the possibility of lightning strikes is also very large, or once the 220V voltage suddenly becomes high, the switching power supply will be burned in an instant.