1
\$\begingroup\$

I'd like to protect from spike, surge, and so on... an electronic interface that is powered from a 220V / 5V DC power module (AZ Delivery AC-05-3). The board, designed by me, integrate and ESP 32 board and some other ICs. I'm searching for an easy, cheap, and effective solution. I need anything tha can easly integrated on the PCB. Any idea?

enter image description here

\$\endgroup\$
3
  • 1
    \$\begingroup\$ Define the spike or aggressor and define the victim's withstand capabilities as they currently stand. Then design the bit to go in between. \$\endgroup\$
    – Andy aka
    Commented Oct 22, 2022 at 17:12
  • \$\begingroup\$ You should define what you want to protect from spikes and surges. The mains input of power supply, or relay contacts? Also is the mains inlet area filled with ground plane - if so your product may not be up to safety standards and you should redesign the board. \$\endgroup\$
    – Justme
    Commented Oct 23, 2022 at 21:28
  • \$\begingroup\$ @Justme Hi. Thanks for reply. I'd like to protect, in order of importance: 1) ESP 32 board; 2) AC /DC power supply 3) relay and loads powered from it. \$\endgroup\$
    – M4Biz
    Commented Oct 25, 2022 at 6:09

1 Answer 1

0
\$\begingroup\$

It really depends on the load you are driving, and it also depends on what kind of surge rating you need because AC mains can throw a lot at a product (thousands of volt spikes from lightning and other transients) so I'll cover the basics. You could have something as simple as a line filter that filters out fast spikes from AC mains and also conducted emissions from switchers that might get back into the line from a power supply load side of the product

enter image description here
Source: https://www.electronics-tutorials.ws/power/transient-suppression.html

Some of them also have integrated fuses and switches:

enter image description here
https://www.schurter.com/en/products-and-solutions/catalog?(pg06)/1

Sometimes a crowbar circuit can be used (and is used in many devices such as power supplies) so when a high voltage spike comes in it activates a SCR and burns out a fuse

enter image description here
https://www.electronics-tutorials.ws/power/transient-suppression.html

MOV's can be used to also short out high voltage spikes.

enter image description here
https://www.electronics-tutorials.ws/power/transient-suppression.html

You can also find some products that have these features integrated into modules that could be integrated into a product external to the PCB.

Make sure you follow applicable specs like IEC61010 if you want the product certified, and if you don't it's a good idea to follow them anyway for saftey reasons. The cover insulation creepage and clearance on and off PCB's.

\$\endgroup\$
1
  • \$\begingroup\$ Hi . Thanks for your very interesting and fast reply. I'll study all. \$\endgroup\$
    – M4Biz
    Commented Oct 23, 2022 at 17:35

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.