DRC and netclasses : clearance rules between nets of different potential (lp:#983230)
Original report created by Vesa Solonen (vesa-solonen)
Flexible automatic design rules would need "differential net classes" that means different rules for a net depending on surrounding nets. As an example I'll explain the problem of a traditional power electronics half bridge circuit: HV---- [400V 10A] | Gh--|< [0-415V 1A] [0 < V(Gh)-V(Sh) < 15] | Sh-------> Out [0-400V 10A] | Gl--|< [0-15V 1A] | GND------> [0V 10A] HV net needs "power" class clearance and width towards all nets as does Out. Sh needs "power" class clearance towards all nets, but Gh and width according to "control" class. Gh needs the same, but "control" clearance towards Sh. Gl needs "control" class clearance and width. Curently this system is unrealisable using KiCad DRC. I propose adding a "potential class" description to net class design rules to address this problem. Needed data stuctures for file format support and implementation need to be discussed and designed. Interested parties are encouraged to comment here and aim for a production ready blueprint.
Original tags: drc pcbnew