1. power adapter fuse: it is mainly used for overload protection. If the fuse is properly placed in the circuit, the fuse will fuse itself to cut off the current when the current rises abnormally to a certain height and heat, thus protecting the safe operation of the circuit.
2. inductive coil (also known as choke): current blocking, tuning and frequency selection.
3. rectifier bridge: convert AC to DC.
4. varistor: it is mainly used to clamp the voltage when the circuit is under overvoltage and absorb excess current to protect sensitive devices
5. Pwmic (integrated circuit): a certain process is adopted to interconnect the transistors, resistors, capacitors, inductors and other components and wiring required in a circuit, make them on a small or several small semiconductor chips or dielectric substrates, and then package them in a shell to form a micro structure with required circuit functions; All the components have formed a whole in structure, making the electronic components a big step towards miniaturization, low power consumption, intelligence and high reliability.
6. Switching transformer: the DC input voltage is regarded as a sequence of DC pulse voltage, i.e. unipolar pulse voltage, by controlling the on and off of the switch, which directly supplies power to the switching transformer.
7. Electrolytic capacitor: electrolytic capacitor gets its name because it uses electrolyte as electrode (negative electrode). One end of the electrolytic capacitor is the positive pole and the other end is the negative pole, which cannot be reversed. The positive terminal is connected to the positive end of the rectifier output circuit, and the negative terminal is connected to the negative end of the circuit. In all circuits that need to convert AC to DC, setting filter capacitors will make the working performance of electronic circuits more stable, and reduce the interference of alternating ripple to electronic circuits
8. Power adapter high-power switch tube: it is one of the core components in the switching power supply. The switching power supply can work "one on and one off", and the power of the switch tube is indispensable.
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