Analysis of  laptop power adapters and maintenance

Visit the source of power – Analysis of laptop power adapters and maintenance Laptop power adapter is the source of the work force, which is a high-quality switching power supply, article from www.supply-batteries.co.uk its work Principles and color TV and other appliances in the switching power supply is the same, its role is to provide a stable notebook Low-voltage direct current (usually between 12 ~ 19V).

Universal laptop AC adapter Notebook power adapters are fully sealed small volume set Dollars, while its consumption of power is generally up to 35 ~ 90W, so the internal temperature is high, especially in hot summer Day, touch the power adapter will work in a hot feeling. Because of this, the power adapter failure Rate relative to other components of notebook computers is still relatively high. Damaged power adapter after the purchase of a full New to spend several hundred dollars, from used car markets may also need to hundred dollars. In fact, many of damage and power adapter Not serious, a little knowledge of the user to understand some of the circuit can try to repair, this article will be IBM's "meat bone" power Source adapter (16V, 4.5A), for example, describes the disassembly and easy maintenance for your reference. Power Adapter

Disassemble notebook power adapter device the upper and lower cover for the injection or packaged together with a strong adhesive, and without any He screws, so the general can only use violence to crack. Acer aspire 5500 AC adapter However, as long as the right way, dismantling the power after the appropriate Adapter completely restored to their original, not carefully observed there is almost no open at the scene. Dismantling tools: Electric knife, hammer, screwdriver, soldering iron, utility knife and so on.

Step1: Connect the power adapter is placed in the horizontal side White paper, Dell inspiron 6400 AC adapter with the electric knife blade along the power adapter cut the gap between the upper and lower lid, then tap with a hammer electric Work knife knife blade (Figure 1), the electric knife cut from the adapter into between the upper and lower lid.

The above method on the adapter The gap between the lower cover many different locations, then use the electric knife tip along the gap between the upper and lower lid a few paddling Circle, when the upper and lower parts of the first crack of a cover, put the tip in-depth, then slowly up and down the adapter separately Cover. This articles comes from www.supply-batteries.co.uk Nikon en-el14 battery

Step2: Figure 2 shows the power adapter open the shell, you can see the adapter circuit wrapped in a copper-screen Shield layer, with art knife to open the shield on the paper tape, and then open electric soldering iron shield and the internal circuit board with Then the two joints , you can remove the shield. Structural analysis of the power adapter goes on, we come to understand the internal structure of the power adapter

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Functions are as follows:

1: varistors, and its function is when the external voltage is too high, the pressure-sensitive resistor quickly become very small, and the pressure Min was blown fuse in series resistance to protect the other circuits will not be burned.

2: Fuse, specifications for 2.5A/250V, when the current in the circuit is too large, the fuse will blow to protect the other components.

3: Inductance Coil (also called choke), the main function is to reduce electromagnetic interference. 4: bridge rectifier, specifications for the D3SB,  Apple powerbook G3 adapter Role is to 220V AC into DC.

5: filter capacitor, specifications for 180uF/400V, the role of Filter out the AC ripple in DC, make the circuit more reliable.

6: op amp IC (integrated circuit), Paul Protection circuit, an important component of the voltage regulator.

7: The temperature probe used to detect the internal power adapter Temperature, when the temperature is higher than a set value (different brands of power adapter, the set temperature threshold slightly Different), the protection circuit will cut off the adapter voltage output, thereby protecting the adapter from damage.

8: Power switch, switching power supply is one of the core components, switching power supply to "opening and closing" to work Switch credit.

9: switch transformers, switching power supply in one of the core components.

10: Secondary whole Flow tube, the function is the low-voltage alternating HP 510 AC adapter current into low voltage direct current. IBM power adapter in, the rectifiers to Is parallel to the work of two high-power, to obtain a larger current output.

11: sub-filter capacitor Specifications for the 820uF/25V, there are two, low-voltage direct current from the filter's ripple effect. In addition to these components In addition, there are adjustable potentiometer circuit boards and other RC components.