What is the construction of the notebook power adapter? What are the pieces after you disassemble them?

Laptop Power Adapter is a common tool, but do you know its construction? What is the construction of the notebook power adapter? What are the pieces after you disassemble them? Let's take a look today!

What is the construction of the notebook power adapter? What are the pieces after you disassemble them?

1. Varistor, its function is that when the external voltage is too high, the varistor resistance value becomes very small rapidly, and the fuse in series with the varistor is blown, so as to protect other circuits from being burned out.

2. Fuse, specification is 2.5A/250V, when the current in the circuit is too large, the fuse will be blown to protect other components.

3, inductance coil (also known as choke coil), the main function is to reduce electromagnetic interference.

4, the rectifier bridge, the specification is D3SB, the role is to change 220V alternating current into direct current.

5, filter capacitor, the specification is 180μF/400V, the role is to filter the AC ripple in DC, so that the circuit work more reliable.

6, operation amplifier IC(integrated circuit), an important part of the protection circuit, voltage regulation.

7, the temperature probe, used to detect the internal temperature of the power adapter, when the temperature is higher than a certain set value (different brands of Power Adapters, the set temperature threshold is slightly different), the protection circuit will cut off the voltage output of the adapter, so as to protect the adapter from damage.

8, high power switching tube, is one of the core components of switching power supply, switching power supply can "open and close" to work, the switching tube is indispensable.

9. Switching transformer, one of the core components of switching power supply.

10, secondary rectifier tube, function is to change low voltage alternating current into low voltage direct current. In IBM's power adapter, the rectifier tube is often operated in parallel by two large power units to obtain a large current output.

11. There are two secondary filtering capacitors, 820μF/ 25V, which can filter the ripple in low-voltage DC.

In addition to the above components, the power adapter circuit board also has adjustable potentiometer and other resistance and tolerance components.