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How to disassemble the power adapter

How to disassemble the power adapter

Power adapter analysis:
The upper and lower covers of the power notebook power adapter are either injection molded or glued with super glue, without any screws.
Generally, it can only be cracked by violence. However, as long as the method is right, the disassembled power adapter can be completely restored, and the traces of dismantling can hardly be seen without careful observation.
Disassembly tools: electrician knife, hammer, screwdriver, electric iron, utility knife, etc.
Place the lateral side of the power adapter on the white paper, cut it with the electric knife blade along the gap between the upper and lower covers of the power adapter, then hit the back of the electrician with a hammer and cut it between the upper and lower covers of the adapter. At different positions of the gap between the upper and lower covers of the adapter, use the tip of the electrician to move along the slit. When a certain part of the upper and lower covers is first cracked, the tip of the blade is deepened, and then the adapter cover is slowly separated.
Open the power adapter of the outer casing, you can see the copper shield on the outside of the adapter circuit, cut the tape on the shield with a utility knife, and then solder the two solder joints connecting the shield to the internal circuit board with a soldering iron. : The shield can be removed.
There is a thick layer of hard plastic shell between the shielding layer and the circuit board. After cutting it with a utility knife, you can see the true face of the circuit."
Fourth, the part name and function are as follows:
Switching transformer, one of the core components in a switching power supply.
a temperature probe for detecting the internal temperature of the power adapter. When the temperature is higher than a certain value (the adapter of different brands has a slightly different temperature threshold), the protection circuit cuts off the voltage output of the adapter, thereby Protect the adapter from damage.
The varistor, its function is that when the external voltage is too high, the varistor resistance quickly becomes very small, and the fuse of the varistor string is blown, thereby protecting other circuits from being burned out.
The fuse is 2.5A/250V. When the current in the circuit is too large, the fuse will blow to protect other components.
Inductor coil, also known as choke, its main function is to reduce electromagnetic interference.
The rectifier bridge, the specification is D3SB, is used to convert 220V AC into DC power.
7. Filter capacitor, the specification is 180μF/400V, the function is to filter the AC ripple in DC, which makes the circuit work more reliable.
Op amp IC (integrated circuit), an important part of protection circuits and voltage regulation.
Secondary rectifier, the function is to change the low-voltage alternating current into low-voltage direct current. In IBM's power adapters, the rectifiers are often operated in parallel with two high powers to achieve a large current output.
(10. High-power switch tube is one of the core components in the switching power supply. The switching power supply can work “open and close”.
V. Internal overview
In the power adapter, there is nothing mysterious, and there is no principle difference between the ordinary switch and the voltage regulator circuit.
These are also "capacitors, resistors, inductors, switching diodes, power core chips" (not discharged) and so on. And both are high fever.
For example, the power adapter of the notebook is about sixty or seventy-six W, and the heat generated inside is mainly transmitted through the plastic casing. The surface temperature of the power adapter is still quite high. The inside of the adapter is a standard stove. Therefore, when using the notebook, try not to stack things on it, especially flammable materials, otherwise there will be amazing results.

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