Technical Battery Questions: Laptop charger

Monday, January 8, 2018

Laptop charger

Laptop charger (Laptop adapter). It is laptop charger. Traditional laptop charger can only output single voltage to a laptop model, this traditional laptop power adapter is a single band notebook charger.

Basic composition

Input line + charger body + output line + connector

Important classification

By brand

The world's leading brand of several popular laptop chargers (in alphabetical order):
Acer(laptop world famous brand)
Apple(laptop world famous brand)
Asus (laptop world famous brand)
Dell (laptop world famous brand)
Hp (a world famous notebook computer, merged with COMPAQ)
Lenovo (laptop world famous, has merged with IBM)
Toshiba (laptop world famous brand)

By purpose

AC use (such as home, office use AC are called AC)2,
DC use (such as the car, the aircraft are used DC are called DC)

By output voltage and current

(Charger behind the label, generally written behind the OUTPUT, write the number of V, how much A):
12V series, Asus more commonly used, such as ASUS 12V3A
15V series, Toshiba more commonly used, such as TOSHIBA 15V3A, 15V4A, 15V5A, etc.
16V series, Sony , IBM more commonly used, such as SONY 16V4A, IBM 16V4.5A
18.5V series, Hp is more commonly used, such as HP 18.5V3.5A
19V series, such as Acer 19V3.42A, TOSHIBA 19V3.42A
19.5V series, such as Dell 19.5V3.34A, SONY 19.5V4.1A
20V series, such as DELL 20V3.5A, LENOVO 20V3.25A
24V series, such as Apple 24V1.875A

working principle

As the family's power supply is generally about 100V-240V (AC, referred to as AC),
The power supply on the car and the plane are generally about 12V (DC, referred to as DC), but these three common power supply is unstable, can not be charged directly to the laptop, otherwise it will damage the battery and laptop. Laptop power demand for a stable constant voltage DC.
Therefore, the working principle of laptop power adapter is simple: that is, the use of unstable power switching power supply principle, through the conversion circuit into a laptop needs constant voltage DC, power supply and charging laptop.
It is noteworthy that: This conversion circuit, there must be a protection circuit (over-current protection circuit, over-voltage protection circuit short circuit protection circuit, etc.), to prevent accidents, the laptop will not burn.

Purchase advice

Select a good brand

Do not buy cut-off substandard products, normal use no problem, in the event of an accident, it will burn your laptop, save dozens of pieces but burned thousands of notebook worth the candle, (jerry-building, common practice chaos Standard power, such as the actual only 19V3.42A, but the standard 19V4.74A, this will cause the charge is very slow, or even damage the battery and laptop, there are some protection removed, this more horrible accident occurs will burn the laptop .)
I suggest you fund to buy a professional brand, a professional-brand products will not cause damage to the battery and laptop, but also to protect the circuit)

Identify the voltage, current and connector

Look at the original laptop which brand, the original charger behind the label is written on the number of V, how many A (generally written in the OUTPUT behind), the charger connector is round or square, or porous, Do not buy the wrong, or even fooled.
For example, your original charger is 18.5V 3.5A that is to say that we must buy output 18.5V, as current higher than 3.5A can be.

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