How to isolate the strong and weak current wiring in EPS?

Implementing strong and weak current isolation wiring on the EPS control board is crucial for ensuring reliability and safety. Strong current refers to high-voltage, high-current sampling or drive signals; weak current refers to low-voltage digital and analog signals. Isolation methods include:

1. Physical separation: On the PCB layout, clearly separate strong and weak current areas using copper-free isolation strips or trenches, prohibiting weak current wires from crossing strong current areas.

2. Ground plane segmentation: Separate strong current grounds (such as drive power ground, sampling ground) and weak current grounds (such as MCU digital ground, analog ground), and connect them at the power input using ferrite beads or single points.

3. Use of isolation devices: Use optocouplers, isolated operational amplifiers, or digital isolators for electrical isolation where strong and weak current signals must interact (such as sampling and driving).

4. Shielding and filtering: Use shielded or twisted-pair cables for strong current sampling lines, and filter them before they enter the weak current area (e.g., RC filtering, common-mode inductors).

5. Meeting safety distance requirements: Ensure that strong and weak current traces and components meet electrical clearance and creepage distance requirements.