Learning About Polymer Capacitors - The Learning Circuit
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- čas přidán 5. 09. 2024
- Capacitors are a seemingly simple device. In this episode, James goes deep into what makes polymer capacitors different from other capacitor types. Spoiler alert: it is a material found on the cathode side of the capacitor that makes a polymer, a polymer. Additionally, he covers what to consider when trying to switch from a multilayer ceramic capacitor (MLCC) to a polymer. Get the B.O.M. on the element14 community: bit.ly/2UlyRrY
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`i am 37 yrs in electornic field and 52yrs old, and i like to study the electornic parts but in recent yrs more new parts appear so the real name are not sure, also i know their character in frequceny, Thanks element14 fullfill my knowledge, i am came from HK.
Nice that you mention the conflict minerals issue.
this guy is great. can we please have more videos with him?
Thank you, Engineer! Please make more videos!
Very detailed information about capacitor in 11 minutes!
James, AWESOME video!
great explanation!
Yes please to the ripple voltage talk
Very well done and insightful. Cheers
11:27 Yes, I Do! I'm really insterested. Please!
Extremely useful video. Thanks to you I now understand the BS that vendors expect you to know when reading capacitor datasheets. Like that you can't get close to "rated" voltage. Thanks again!
Excelent video tks másters, 🎩💯😊
Nice work James!
Q1
When you get a through hole aluminium electrolytic capacitor it has a plastic coating that prevents the Al can from shorting anything when mounted on the board. All polymer electrolytic capacitors that are through hole seem to miss this and just have details printed on the top of can with no insulator at the base of the can where it could touch contacts. Is there a reason for this ? It means I have to use a nylon washer under the superior polymer electrolytic caps compared to normal aluminium capacitors when doing through hole mounting. It seems like a step backwards.
Q2
Also the polymer caps, which are dry inside, still seem to be crimped at the base and use a rubber insert just like the electrolytic capacitors which seems odd. Why don't they just use an epoxy or similar that insulates the base of the can from the board and fix a possible shorting problem at the same time. They obviously have nothing that can gas inside as there is no cross printed on top of can to weaken polymer capacitor confirming that there is nothing liquid inside.
Geoffrey, NZ
soo cap much wow .... I restricted myself before to ceramic and electorlytic caps, just because I did not know about the benefits of polymer caps. time to give ém a try
Great video - Caps are the most misunderstood and misapplied components in my experience. They always have parameter trade offs. They also seem to be the leading component to cause issues during product development and production testing when you start varying parameters like temperature and voltage. But they are a necessary evil :).
Nobody cares about capacitors until they do.... ;)
Very cool !thanks
Excellent, very detailed considering the time you were suggested/given, you earned a sub.
Edit: wait you don't do these kinds of videos in your own CZcams channel? Where can I find your 1 hour+ videos about capacitors?
Edit2: I found AddOhms
I never did a capacitor video on AddOhms. When I say talks, I meant "live talks" which last at lasted around an hour. (I used to work for a capacitor company.)
How do the newer ceramic caps compare to the older style disc ceramics (aside from capacity)? Yes on the ripple demo board.
15743 Hertz There is no comparison. MLCCs have more electrode layers which give them lower ESR and more metal to act as a heat sink for the dielectric. So they can handle significantly more ripple.
@@bald_engineer So the voltage and capacitance effects that are experienced in the newer ceramics don't affect the older ceramic disc caps?
I can also see why the tantalums would need to run at near their effective voltage in order to get the desired capacitance. Running them at or near their rated capacity would cause them to fail more quickly compared to the wet electrolytics, right?
just checking a few facts. so near the beginning of polymer tantalum capacitors manufacturing they used MnO2 as it's cathode material which when cracked their will be to much current flowing threw causing heat and the Oxygen splits off the MnO2 and the now Mn203 catches fire because it's hot enough. Is what i said correct to anyone's knowledge?
Lots of good information here, but at the beginning you referenced another video that Karen did but there's no link to it in the description.
Hi! For a moment I've thought it will be about poly-styrene non-polarized caps :) you know... that "green fishes"...
Got here because of RTX 3080 crashes due to rumored Poscaps
RATHER CONFUSED OVER THE DIFFERENT TYPES OF POLYMER CAPACITORS BUT,WOULD LIKE TO HEAR THE LECTURE ON CAPACITORS ON POWER SUPPLIES.
I'll never buy tatalum capacitors
The Hybrid Capacitors are made because of the normal failure mode of Polymer Capacitors. While normal Electrolyte Capacitors usually fail open, the Polymer Capacitors fail shorted -> explode
Stefan Payne That might be a benefit of hybrid, but that is not the reason they were developed. Hybrid was developed to increase cathode coverage by allowing the more liquid electrolyte to penetrate into the anode foil’s etched valleys.
Shorted polymers could potentially burn, but I don’t see how they could explode. As PEDOT heats up, it oxidizes which would remove free-floating oxygen in the vicinity of a fault site. It is one reason there is no safety vent. There is nothing to vent.
That said, a hybrid cannot fail open until its vent opens, which, one might call an explosion.
first!