Notebook computer power adapter overview


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Notebook computer power adapter overview

1. Comparison of various power adapters
Different power adapters have different appearance interfaces, but their functions and working principles are basically the same. The following is about power adapters
A brief introduction to the differences between.
(1) the input voltage interface of the power adapter is different, as shown in figure 2-2.
(2) the voltage input of the power adapter is different, as shown in figure 2-3. The range of input voltage identified on the adapter should be specified
Meet the requirements of electricity.
(3) the output voltage of the adapter is different. For different laptop computers of different brands and models, the output voltage of the adapter is 1
It's usually between 12 and 19V.
(4) the interface of the adapter output voltage is different, mainly including circular port and three ports, as shown in figure 24
The rate is large four by tone, medium M. The transition is made by a helicopter
2. Power adapter structure analysis
The internal structure of the power adapter is shown in figure 2-5. For the power adapter internal "close-up", the main circuit components have been
The names and functions of the parts are described below.
(1) piezoresistor, its function is when the external voltage is too high, the piezoresistor resistance value quickly become small, and piezoresistor
The series fuse was blown to protect other circuits from being burnt out.
(2) the fuse is 2.5a /250V. When the current in the circuit is too large, the fuse will be blown to protect other elements
The main function of the inductance coil (also known as the choke coil) is to reduce electromagnetic interference. (C
Pray to the city
(4) the size of the rectifying bridge is D3SB, which is used to change 220V ac into dc.
(5) the size of the filter capacitor is 180 muon F/400V, which is used to filter out the alternating ripple in direct current and make the circuit work more
And reliable.
(6) operational amplifier IC(integrated circuit) is an important part of protection circuit and voltage regulation
(7) the temperature probe is used to detect the internal temperature of the power adapter. When the temperature is higher than a certain set value, the protection circuit will
Automatically cut off the output voltage of the power adapter to protect the power adapter and laptop components from damage.
(8) the high-power switch tube is one of the core components of the power adapter. The power adapter can work "on and off"
Guan guan played an important role
(9) the switching transformer is one of the core components of the power adapter, whose main function is to change the voltage. Secondary rectifier
The function is to change the low voltage alternating current to the low voltage direct current. In IBM power adapters, rectifiers tend to have two large powers
A rectifier tube operated in parallel to obtain a larger current output
(10) secondary filtering capacitor, size 820 mu F/25V, has two functions, which can filter ripple in low-voltage dc
To use.

| release time：2019.09.25 Source：

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Notebook computer power adapter overview