source:Industry News Popular:adapter release time:2022-03-08 10:19:23 Article author:sznbone
Power adapters may be used in every family, but you may not expect it to be in the corners around you that you have almost forgotten, so do you know what a power adapter is? Follow along with me to find out!
The usual power adapters are composed of shells, high-frequency transformers, wires, PCB circuit boards, hardware, inductors, capacitors, control ICs and other components, as follows:
1. Varistor, its function is that when the external current and voltage is too high, the resistance of the varistor quickly becomes very small, and the fuse connected in series with the varistor is blown, thus protecting other power circuits from being burned.
2. The fuse, the specification is 2.5a/250v, when the current in the power circuit is too large, the fuse will blow to protect other components.
3. Inductance coil (also known as choke coil) is mainly used to reduce electromagnetic interference.
4, rectifier bridge, the specification is d3sb, the function is to convert 220v alternating current into direct current.
5. The filter capacitor, the specification is 180uf/400v, filters out the AC ripple in the DC power and makes the power circuit run more reliably.
6, operational amplifier ic (integrated circuit), an important part of protecting power supply circuit and current 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 (different brands of power adapters have slightly different temperature thresholds), the protection power circuit will cut off the power supply of the adapter. Current voltage output, thus protecting the adapter from damage.
8. The high-power switch tube is one of the key components in the power adapter. The power adapter can run "one on and one off", and the switch tube is indispensable.
9, switching transformer, one of the key components in the power adapter.
10. The secondary rectifier tube converts low-voltage alternating current into low-voltage direct current. In ibm's power adapter, the rectifier tube is usually run in parallel by two high-power ones to obtain a relatively large current output.
11. Secondary filter capacitors, with a specification of 820uf/25v, there are 2 in total, which play the role of filtering out the ripple in the low-voltage direct current. In addition to the above components, there are adjustable potentiometers and other resistance-capacitance components on the circuit board.
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