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No Wires Adapter Mainly Divided Into These Two

No Wires Adapter Mainly divided into these two

What is the no-wire adapter? No wire adapter, also known as external power supply, is a small portable electronic equipment and electrical appliances supply voltage conversion equipment, common in mobile phones, LCD monitors and notebook computers and other small electronic products. Its role is to convert the home to a high voltage of 220 volts into these electronic products capable of working from 5 volts to about 20 volts to stabilize the low voltage so that they can work properly. This article describes the basics of wireless adapters and what is the no-wire adapter.

1, no wire adapter type no wire adapter

No wire adapter mainly divided into two, switching power supply and linear power supply.

1) Switching power supply is a power supply that uses modern electronic technology to control the time ratio of turn-on and turn-off of the switch and maintain a stable output voltage. The switching power supply of the no-wire adapter is generally composed of pulse width modulation (PWM) control IC and MOSFET.

Advantages: high efficiency, small size, can work in a wide voltage range. Disadvantages: the interference of the power supply circuit is large, the failure of repair more difficult.

2) linear power supply is the transformer through the transformer transformer, rectifier circuit rectifier filter to obtain unstable DC voltage, no wire adapter to achieve high precision DC voltage, must be adjusted by the voltage feedback circuit output voltage.

Advantages: This power technology is mature, the circuit is simple, and there is no switching power supply with the interference and noise.

Disadvantages: voltage feedback circuit is working in a linear state, adjust the tube power consumption, conversion efficiency is low, because the use of inductive transformers so the device weight.

2, no wire adapter to the role

The role of the wireless adapter is the transformer and the rectifier. Home AC is 220v, and our computer is DC 12v (as if), so be sure that no wire adapter is the transformer and rectifier. Then the adapter is a transformer, we should know that AC 220v transformer through the transformer, through the rectifier to DC, where there is consumption, and these consumption will be converted into heat, so no wire adapter will heat is normal. Transformer is made of silicon steel, the transformer power, resulting in magnetic flux, magnetic flux will lead to the role of silicon steel between the force, resulting in buzzing sound, which is normal. But the sound of the earth is not normal, for many reasons: 1, AC voltage instability. 2, chip damage. 3, short circuit between turns. 4, component damage.


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