How should the spacing between EPS power lines and signal lines be designed?

Standardizing the spacing between power lines and signal lines in EPS (Electrical Packaging) is a fundamental design rule for preventing coupling interference and ensuring safety. Spacing design should adhere to the following principles:

1. Safety Priority: First, meet safety standards for electrical clearances and creepage distances, especially on the AC side and high DC voltage sections. Spacing is determined by the voltage level.

2. EMC 3W/20H Rules: For high-frequency signals, it is recommended that the distance between lines be at least three times the line width (3W rule) to reduce crosstalk. If the signal line is close to the board edge, it should be recessed by at least 20 times the dielectric layer thickness (20H rule) to reduce edge radiation.

3. Layered Isolation: The optimal solution is to place power lines and sensitive signal lines on different PCB layers, separated by a ground or power layer.

4. Handling Unavoidable Interference: If parallel routing on the same or adjacent layers is unavoidable, maximize the spacing. If crossing is unavoidable, ensure perpendicular crossing. For critical sensitive lines, use ground lines or guard traces to isolate them from power lines and ground them at both ends.