What are the applications of anti-interference magnetic rings? Electromagnetic interference (EMI) can be roughly divided by frequency band: 0.02～2kHz, harmonic interference; 2～300kHz, conducted interference or carrier frequency interference; 0.3～300MHz, radio frequency interference; 0.3～300GHz, microwave interference. In terms of the interference path, 0～300kHz coexists with conducted interference and near-field induction interference caused by alternating electromagnetic fields; radio frequency and microwave interference are both far-field radiation interference. When the length of the equipment and wires is shorter than the wavelength, the main issue is conducted interference; when their sizes are longer than the wavelength, the main issue is radiation interference. For longer cables, filters should be added to the cables, with the common method being to wrap ferrite magnetic rings to reduce conducted and radiation interference. Magnetic rings used to suppress electromagnetic interference differ from the ferrite commonly used for inductance, as they have a very low quality factor Q and higher losses.

The reliable operation of electronic devices such as ABS anti-lock braking systems, engine fuel injection and electronic control systems, and GPS global positioning systems requires a focus on electromagnetic compatibility (EMC) design and research. This can be explored starting with traditional automotive electrical components, such as starters, windshield wiper motors, flashers, air conditioning starters, and fuel pumps. The connection and intermittent cutting of alternator cables are also sources of significant electromagnetic radiation interference. However, the impact of other devices on their reliability is smaller compared to that of low-power high-frequency electronic devices. Now, alternator regulators, like electronic ignition systems, have been designed as integrated modular structures and face interference issues as well.