The electromagnetic interference and response process generated by any electronic device can be used to describe the source of interference (test signal generator) by radiation and conduction, and the characteristics of the response receiving device can be described by radiation sensitivity and conduction sensitivity. Therefore, all electromagnetic The interference suppression method can start from the following three aspects:
Suppress electromagnetic interference sources;
Cut off the electromagnetic interference coupling path;
Reduce the sensitivity of electromagnetic sensitive devices.
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This article mainly discusses measures to improve the electromagnetic compatibility of electronic equipment around these three aspects, such as selecting a circuit that suppresses electromagnetic interference, adopting appropriate working conditions; implementing correct lap, grounding, shielding, filtering, and layered protection; adopting reasonable classification Wiring and other methods can effectively suppress electromagnetic interference or reduce sensitivity. Various methods are not only used independently in electronic devices, but are also related to each other.
The following mainly summarizes the interference suppression technology from the aspects of grounding, shielding and filtering.
- Grounding
Grounding in electronic equipment is one of the important methods to suppress electromagnetic noise, prevent electromagnetic interference, and protect the safety of personnel and equipment. When electronic equipment is required, the base and metal shell must be reliably grounded. This is to protect the safety of personnel and equipment, which is called “protective grounding”; the other type of grounding is called “shielding grounding”, which refers to the shielding layer used to suppress interference (Body) grounding, in order to play a good anti-interference effect.
- Filter
In the KMC design, using different filters can not only suppress the conducted interference from electronic equipment, but also suppress the conducted interference introduced by the power supply network. EMI filters are often used in engineering to suppress high-frequency pulse interference.
The EMI filter is installed between the electronic equipment and the power line. It can suppress the high-frequency noise introduced by the power supply, improve the anti-interference ability of the equipment, and play an important role in improving the reliability of the equipment.
- Shield
Shielding is one of the important means to improve the electromagnetic compatibility of systems and electronic equipment. It can effectively suppress various interferences that are transmitted in space through radiation. Therefore, the use of shielding measures can not only prevent or reduce the transmission of electromagnetic radiation energy inside the electronic device, but also prevent or reduce the impact of external radiation energy on the device. According to the working mechanism, shielding can be divided into: electric field shielding, magnetic field shielding and electromagnetic field shielding.
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