How should the strong and weak current wiring be isolated on the PCS control board of an energy storage system?

Implementing strong and weak current isolation wiring on the PCS control board is crucial for ensuring reliability. 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 ground (e.g., drive power ground) and weak current ground (e.g., MCU ground) using ferrite beads or single-point connections.

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

4. Shielding and filtering: Use shielded or twisted-pair cables for strong current sampling lines and filter them before they enter weak current areas, for example, using common-mode inductors or filter capacitors.

5. Increasing creepage distance: Ensure that the electrical clearances and creepage distances between strong and weak current traces and components meet safety regulations.