| Electronics > Beginners |
| Simplified guidelines for device certification? |
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| nardev:
Hello guys. I believe there is a lot of documents and aspects regarding a device certification. However, I just want to get some idea about most common problems and safest ways to avoid them for device design. So let's imagine a device/pcb with buck converter, bunch of relays for a common, small power/current/voltage 2Kw, microcontroller, touch keypad on same pcb, maybe some shift registars, common LEDs and of course bunch of a connectors. P.s. I would not try to add antenna and other radio like segments to this example as I believe it would make things way too complex for a simplified talk. What are most common issues? Isolations of used and unused GPIO pins? Space between relays, lines, parts? I'm aware that somebody could talk days on this generalized question but as I said, "what is the most common" ? Thnx |
| nctnico:
The keyword is filtering and overvoltage protection: every incoming and outgoing signal should have some form of filtering and overvoltage protection. A simple series resistor of 1k Ohm may already do the job for GPIO pins. Also keep high current/high frequency loops small and keep them away from other circuitry. Nowadays I have a common mode choke at the input and output of any isolated DC-DC converter. This ensures that the DC-DC converter can't push noise into system ground. But there are many ways to mess things up; there isn't a generic recipe. |
| Simon:
So what are you trying to certify for? I can give you my best practice but it will make your products expensive if they are comercial because i have to pass military. |
| Mr. Scram:
--- Quote from: Simon on August 18, 2019, 03:04:37 pm ---So what are you trying to certify for? I can give you my best practice but it will make your products expensive if they are comercial because i have to pass military. --- End quote --- I'd be interested to hear about military certifications. Both military and space applications seem to pose interesting challenges. |
| Simon:
--- Quote from: Mr. Scram on August 18, 2019, 04:47:34 pm --- --- Quote from: Simon on August 18, 2019, 03:04:37 pm ---So what are you trying to certify for? I can give you my best practice but it will make your products expensive if they are comercial because i have to pass military. --- End quote --- I'd be interested to hear about military certifications. Both military and space applications seem to pose interesting challenges. --- End quote --- I don't know if there are any specific certificates. But there are standards that will be written into specifications and contracts. The theory is that each contractor tests their devices and then the whole vehicle is tested with the expectation that it should pass as all the components have. However the standards are a lot more stringent than automotive so if I design something "that has to pass EMC" it may be over designed for something that wants to pass auto (reg 10 in the EU) or comercial testing. |
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