Step1: place the power adapter on white paper laterally, cut along the gap between the upper and lower lid of the power adapter with a the electrical knife and then strike the back of the knife blade with a hammer, the electrician knife is cut into it from appropriate position between the upper and lower lids. The above method can be used in the different positions between the covers of computer cable adapters, and then use the electric knife cut along the gap between the upper and lower lid paddling laps. When a certain part of the upper and lower lid is cleaving first, we can make the knife sharp deep in, and then slowly separate the top and bottom of the adapter cover.
Step2: we can see the adapter circuit is wrapped with copper shield and we can open the paper tape on the shield with a box knife, and then weld the two welding points connecting the electric soldering iron and the internal circuit boards to remove the shielding.
Step3: a thick layer of hard plastic membrane exists between the shield and the circuit board, and we can open it with the box knife, then you can see the board.
First, varistor, when the external voltage is too high, the pressure-sensitive resistance quickly becomes very small, varistor series fuse is blown, and so as to protect other circuits will not be burned.
Second, fuse, specification is 2.5A/250V, when the current in the circuit is too large, the fuse will blow in order to protect other components.
Third, inductance coil (also known as choke), the main function is to reduce the electromagnetic interference.
Fourth, rectifier bridge, specification is D3SB, and the role is to alternate the 220V current into direct current.
Fifth, the filter capacitor, specification is 180uF/400V, and universal ac dc adapter role is to filter AC ripple in the DC circuit which is more reliable.
Sixth, op amp IC (integrated circuit), protection circuit, and they are the important parts of the voltage regulator.
Seventh, temperature probe is used for detecting a power adapter internal temperature, when the temperature is higher than a set value (the set of temperature threshold is slightly different in the different brands of power adapter), the protection circuit will cut off the voltage output of the adapter, and thereby protecting the adapter against damage.
Eighth, switching transformer is one of the core components of the switching power supply.
Ninth, rectifier, its function is to change the low-voltage AC into low voltage DC. In the IBM power adapter, rectifier often work in parallel by two high powers, in order to obtain a larger current output.
www.computercablekc.com is a professional manufacturer and exporter of various computer peripheral cables and connectors in China. We supply complete specifications of cables, including AC & DC cables, USB & HDMI & Lan cables, AV &TV cables and other related products. They are fine in quality, fair in price and prompt in delivery. Moreover, RoHS Compliance is also available for all of our products.
This article is come from:http://www.chinaphoneparts.com/index.php/the-analysis-and-maintenance-of-laptop-power-adapter.htm
Step2: we can see the adapter circuit is wrapped with copper shield and we can open the paper tape on the shield with a box knife, and then weld the two welding points connecting the electric soldering iron and the internal circuit boards to remove the shielding.
Step3: a thick layer of hard plastic membrane exists between the shield and the circuit board, and we can open it with the box knife, then you can see the board.
The components of computer adapter
First, varistor, when the external voltage is too high, the pressure-sensitive resistance quickly becomes very small, varistor series fuse is blown, and so as to protect other circuits will not be burned.
Second, fuse, specification is 2.5A/250V, when the current in the circuit is too large, the fuse will blow in order to protect other components.
Third, inductance coil (also known as choke), the main function is to reduce the electromagnetic interference.
Fourth, rectifier bridge, specification is D3SB, and the role is to alternate the 220V current into direct current.
Fifth, the filter capacitor, specification is 180uF/400V, and universal ac dc adapter role is to filter AC ripple in the DC circuit which is more reliable.
Sixth, op amp IC (integrated circuit), protection circuit, and they are the important parts of the voltage regulator.
Seventh, temperature probe is used for detecting a power adapter internal temperature, when the temperature is higher than a set value (the set of temperature threshold is slightly different in the different brands of power adapter), the protection circuit will cut off the voltage output of the adapter, and thereby protecting the adapter against damage.
Eighth, switching transformer is one of the core components of the switching power supply.
Ninth, rectifier, its function is to change the low-voltage AC into low voltage DC. In the IBM power adapter, rectifier often work in parallel by two high powers, in order to obtain a larger current output.
www.computercablekc.com is a professional manufacturer and exporter of various computer peripheral cables and connectors in China. We supply complete specifications of cables, including AC & DC cables, USB & HDMI & Lan cables, AV &TV cables and other related products. They are fine in quality, fair in price and prompt in delivery. Moreover, RoHS Compliance is also available for all of our products.
This article is come from:http://www.chinaphoneparts.com/index.php/the-analysis-and-maintenance-of-laptop-power-adapter.htm