The source of electromagnetic interference of switching power supply components
The interference generated by the switching power supply can be divided into two types: peak interference and harmonic interference according to the type of noise interference source; if it is divided according to the coupling path, it can be divided into two types: conduction interference and radiation interference.
The fundamental way to prevent the interference generated by the power supply from causing harm to the electronic system and the power grid is to weaken the noise source, or to cut off the coupling path between the power supply noise and the electronic system and the power grid.
The high switching action of power switching devices is the main cause of electromagnetic interference (EMI) in switching power supplies. The increase of switching frequency reduces the size and weight of the power supply on the one hand, and leads to more serious EMI problems on the other hand.
When the switching power supply works, its internal voltage and current waveforms rise and fall in a very short time. Therefore, the switching power supply itself is a source of noise.
The interference generated by the switching power supply can be divided into two types: peak interference and harmonic interference according to the type of noise interference source; if it is divided according to the coupling path, it can be divided into two types: conduction interference and radiation interference. The fundamental way to prevent the interference generated by the power supply from causing harm to the electronic system and the power grid is to weaken the noise source, or to cut off the coupling path between the power supply noise and the electronic system and the power grid.
