ClubRobotInsat / libkicad-robot

Les projets et les librairies KiCad du club robot de l'INSA Toulouse.

0 stars 0 forks source link

Design board protections #4

Open gbip opened 5 years ago

gbip commented 5 years ago

Designing protections

We should include protection schematics ready to be included in new projects to ensure maximum reliability.

I suggest that every board we design contain this small schematic (the left one) on the power input : Diode protection Source

gbip commented 5 years ago

Is it a good idea to put resistors on each input/output of the micro-controller ? They should limit the current going through them, just like in TP...

gbip commented 5 years ago

For the coupling capacitors I found ours to be quite big (470 µF is a lot) and it seems that we could use a little bit less.

Most engineers will place 100nF X7R capacitors as close as possible to the IC's power pins. One capacitor per power pin. A good IC pinout will have a ground pin next to each power pin, so you can keep the loop as short as possible.

Source

dotsumae commented 5 years ago

K for reducing coupling capacitors. 470uF is overkill and even possibly unefficient after some researches. I am currently working on the reverse voltage issue using this video EDIT : This video is interesting for it explains how we can avoid using a zener diode (high power losses) by choosing the right MOSFET