When selecting a power supply for a laptop, you should pay attention to its main characteristics:
- Input voltage (110V / 220V);
- Output voltage (V);
- Output current strength (A);
- The type of plug inserted into the laptop.
Most power adapters are made by only a few manufacturers, such as LITEON, DELTA, LiShin, AcBel and FSP. Blocks under these brands are the most popular and high quality.
Laptop manufacturers, as a rule, only glue their stickers on power supplies. So many notebook manufacturers do: ACER, ASUS, Toshiba, Fujitsu-Siemens, HP, Compaq, DELL, LG, IRU, ROVERBOOK, MSI.
From this it follows that it is not always necessary to buy the original power supply of the laptop manufacturer, it is cheaper to buy the original manufacturer of the power supply.
For proper selection of the power supply, it is necessary to determine the output voltage and amperage . These specifications are usually listed on the bottom of the notebook.
Basically, laptops have input voltage from 15 to 20 volts. When selecting the voltage allowed a deviation of 1-2 volts. When selecting the current strength, there is one rule: the output current of the power supply unit should not be less than that required for a laptop. The higher the power supply current (at the same voltage), the more powerful the power supply is. There is an opinion that a more powerful power supply can ruin a laptop's battery, but this is a delusion, because Ohm's law has not been canceled! A more powerful power supply will not spoil the laptop, while it will remain whole and will not work at the limit of its capabilities. A weaker adapter will not spoil the laptop, but can burn itself. So you need to choose or appropriate for the voltage and current or more powerful.
Power supply connectors are divided into standard, having two contacts (voltage and zero) and the third intelligent output.
Power supplies with a standard connector are suitable for brands such as Acer, ASUS, MSI, GigaByte, ViewSonic, RoverBook, Toshiba, Fujitsu-Siemens, iRu. The connectors of such power supply units differ in external diameter (mainly 5 and 5.5 mm.) And internal diameter (1.6 mm; 2 mm; 2.5 mm). When selecting the adapter, it is necessary that the power connector exactly matches the power socket of the laptop, otherwise you can either break the laptop's power connector or it will burn if there is poor contact. Usually the supply voltage (+) is applied to the internal contact, and the zero contact (-) to the external contact. Be careful, reversing the contacts leads to burnout of the laptop motherboard.
The two-contact types include the SONY and SAMSUNG power supplies , although they have a central pin, the supply voltage is output to it, and the external contact is zero.
The three-pin connectors are mainly used in DELL and HP products .
DELL power supplies have three pins: + 19V, zero and information (central pin). When you connect the power supply, the laptop reads its power. If the power of the PSU is less than necessary, the laptop will disconnect the charging of the battery.
HP / Compaq power supplies have the exact same connector, and the center pin is used to determine the power of the power adapter, but electrically these connectors are incompatible.
DELL and HP notebook power supplies are not compatible!
There is one more thing worth paying attention to. Now power supplies for laptops are sold almost in the bread shop. A variety of sentences amazes the imagination, and the names of the manufacturers of the companies make the language go awry.
In addition to the above characteristics, there is one more - QUALITY!
One of them is the original DELL, the other is not original, they have no external differences and it is very difficult for a non-specialist to distinguish the original from the fake. The expert can distinguish the original power supply from the non-original in weight and quality of plastic. Weight differences can be easily explained by disassembling power supplies.
The original power supply is completely covered by the screen.
In addition, a non-original power supply unit has a simplified circuit, often a protection circuit and additional filters, instead of elements there are jumpers, and the quality of soldering is simply surprising.
What threatens such a purchase - if you're lucky, then nothing! If not lucky, then repair the laptop.
The same filling of many Chinese power supply units of unknown manufacturers. A lot of universal power supply units are sold with a bunch of voltage switches, a reversal and a bunch of connectors and of dubious quality.
High-quality universal power supplies produce only serious manufacturers: FSP, LiteOn, AcBel, Rovermate (manufacturer FSP).
A good power supply for a laptop is like high-quality gasoline for your car; the higher its quality, the less likely it is to break down.