How should EPS magnetic rings be arranged in electronic circuits?

When placing ferrite beads in the electronic circuitry of an EPS (Electrical Power Supply), the principle of "close to interference or sensitive sources" must be followed to achieve the best results. Specific placement locations are as follows:

1. Interference source exit: Place the ferrite bead on the noise source (such as the input/output lines of a switching power supply, or the power lines of a driver chip), installing it as close to the noise source as possible to absorb noise before it leaves the chip or module.

2. Sensitive circuit entry: Place the ferrite bead on the cables or PCB traces entering sensitive circuits (such as ADC reference power lines, crystal oscillator power lines, or analog sampling lines) to prevent external noise intrusion.

3. Specific frequency band suppression: Select the ferrite bead material according to the noise frequency to be suppressed (nickel-zinc for high frequencies, manganese-zinc for mid-to-low frequencies), and enhance the inductive reactance at specific frequencies by increasing the number of winding turns.

4. Ensure closure: The ferrite bead should be tightly closed, and its inner diameter should fit as closely as possible to the cable/trace after installation to avoid gaps that reduce performance. Multiple ferrite beads can be used in combination to broaden the suppression bandwidth.