Take computer power as an example to introduce some knowledge about shielding technology.

The shielding technology we refer to usually contains two layers of meaning.

A. Block scattered electromagnetic waves and other interference signals in the environment (including scattered electromagnetic waves on the power frequency grid) outside the shielded power system.

B. The oscillating signal source and the alternating power radiation source in the electric power system are blocked in the electric power system by electromagnetic waves radiated or propagated through various links and various ways in the circuit.

The computer power supply belongs to the switching power supply, so the high frequency electromagnetic waves generated by the oscillator and the power converter will pass through the internal transformer, inductor, capacitor, resistor, lead and PCB circuit board.

Etc. Propagation and radiation.

Shielded technology

Soft shielding

The so-called soft shielding is the use of effective circuit technology (such as common mode filter technology, differential mode filter technology, bidirectional filter technology, low-pass filter technology, etc.)

The following picture is the schematic

Comparing the schematics, we can find out how many parts are installed by the manufacturer of the following physical map.

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