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Large traces to small or square pads. Not enough space problem
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superkris 5 years ago

Hi!

In the past i have designed PCB's at school, but that is now 15 years ago and a lot has changed. I choose EasyEDA for a new project that i need to design a PCB for. The schematics worked fine, and i even was able to create a few custom footprints. This project contains high power circuits up to 40A. If i use 8mm wide traces on both sides of the board with 4oz copper, i think it will be fine, but these wide traces are taking up to much space at the pins and i need a fix for this.

- The ultra large traces need to carry 40A at the least, will run on both sides, and need to me 8mm wide.
- The medium traces need to carry currents of 15A (20A would be preferred) so 4mm traces on both sides are needed
- With a few exceptions most other traces will only need a few mA

Please see the images below to see what problems i need to fix for my routing.
A: This is a custom footprint that i made with square pads. Connecting these adds a lot of extra copper around the pads that i do not want. I need to pass some smaller traces between these.
B: In this case the special pad size also adds a lot of useless copper
C: Here the 2 pads are connected trough the additional copper. This is actually not a problem because these need to be connected anyway, but how can i prevent this?

Hope you guys can help. Thanks in advance!pcb pads.png

Comments
UserSupport 5 years ago

Hi
You can use Solid Region to connect the pads.
图片.png

Reply
andyfierman 5 years ago

Make sure that you set the netname of the solid region to the same as the net connecting to it.

Reply
superkris 5 years ago

Thank you both! this works much better!

I notice in some cases the copper areas are named automatically to the attaches pads, but in others this is not the case. Is there a specific reason why?

Also i have some small additional questions about creating custom parts (PCBlibs)
- With the square dual pads in the drawing i have the solder mask lines touching the pad next to it. Is this a problem?
- Currently im using 2 pads on boths sides, but is there a better way to make a single pad with 2 holes? The need to be multilayer
- Drawing outlines and dimensions in a custom PCBlib is very complicated compared to other CAD software where you can just add dimensions. Am i doing something wrong?

pcb.jpg

Reply
andyfierman 5 years ago

Other approaches to connecting wide tracks to narrow pads are;

  1. to selectively  place narrow tracks from the pads to the wider tracks using short segments;
  2. to place Copper Areas around the pads - with the appropriate netnames - to overlap onto the wider tracks and then select spokes or direct connection before rebuilding the copper areas.

"- With the square dual pads in the drawing i have the solder mask lines touching the pad next to it. Is this a problem?"

No, that's fine.

"- Currently im using 2 pads on boths sides, but is there a better way to make a single pad with 2 holes? The need to be multilayer"

Using 2 multi-layer pads with the same pad number is probably the easiest way to do it.

"- Drawing outlines and dimensions in a custom PCBlib is very complicated compared to other CAD software where you can just add dimensions. Am i doing something wrong?"

You can draw arbitrary lines and specify the start and stop xy points if that helps.

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