4 ms·
Could be denser. Instead of a big passive EMI filter, use an active one (noise cancelling, essentially). It's a little baffling why they aren't more widely use
by nimish 4y ago
Could be denser. Instead of a big passive EMI filter, use an active one (noise cancelling, essentially).
It's a little baffling why they aren't more widely used, they aren't that complicated. https://u.dianyuan.com/bbs/u/17/1086016427.pdf https://u.dianyuan.com/bbs/u/17/1086016427.pdf is an example. It's almost comically simple: connect a current sensor, a high-pass filter, and an opamp controlling a transistor. With some thought it could probably be cut down even more.
I think TI has integrated this into their controllers already.
- hoseja 4y agoConsumer electronics are just so hilariously bleak. Why use the smart option when a cheap one almost does the job too? That would be overengineering and everyone can do that! Only the smartest engineers know how to deliver maximum value to shareholders while offloading the maximum possible externalities! Sorry, pet peeve of mine.
- nimish 4y agoYeah it's really disappointing that even in high cost consumer electronics there's very little incentive to innovate in non-sexy areas :(
- ClumsyPilot 4y agoIs the passive one more reliable, less to go wrong?
- deleted 4y ago[deleted]
- nimish 4y agoWell the big electrolytic caps you need for the passive filters are infamously unreliable which is why you see everyone trumpeting their "Japanese" brand capacitors which are supposed to be better. The caps you need for the active filter are the tiny solid ceramic ones that are basically bulletproof except in high vibration environments. The ICs needed are similar.