Provide stable low voltage DC power (generally between 12~19v) for laptop computers.
Power adapter use: switching power supply products are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communications equipment, electric power equipment, instruments, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, LCD monitors, LED lamps and lanterns, communications equipment, audio-visual products, security, computer chassis, digital products and Instruments and other fields.
Expanded Information
The composition of the laptop power adapter
1, varistor, its function is that when the external voltage is too high, the varistor resistance value quickly becomes very small, and the series connection with the varistor fuse is blown, so as to protect the other circuits not to be burned.
2, the fuse, specification for 2.5a/250v, when the current in the circuit is too large, the fuse will blow to protect other components.
3, inductance coil (also known as choke), the main function is to reduce electromagnetic interference.?
4, rectifier bridge, specifications for the d3sb, the role of the 220v ac into dc.?
5, filter capacitors, specifications for the 180uf/400v, filtering DC in the AC ripple, so that the circuit work more reliable.?
6, op amp ic (integrated circuit), protection circuit, an important part of voltage regulation.
7, temperature probe, used to detect the internal temperature of the power adapter, when the temperature is higher than a set value (different brands of power adapters, the set temperature threshold is slightly different), the protection circuit will cut off the adapter's voltage output, thus protecting the adapter from damage.
8, high-power switching tubes, switching power supply in one of the core components, switching power supply can be "on and off" to work, switching tubes can not be ignored.
9, switching transformer, one of the core components of the switching power supply.
10, secondary rectifier, low voltage alternating current into low voltage direct current. In ibm's power adapter, the rectifier tube often consists of two high-power parallel operation, in order to obtain a larger current output.
11, secondary filter capacitors, specifications for the 820uf/25v, *** there are two, to filter out the role of ripple in the low-voltage DC power. In addition to the above components, there are adjustable potentiometers and other resistive components on the board.
Baidu Encyclopedia - Laptop Power Adapter