Guest
They're not really saying much about the new algorithm, it must be complex:
https://www.kit-technology.de/en/technology-proposals/details/664/
https://www.kit-technology.de/en/technology-proposals/details/664/
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K
Klaus Kragelund
Guest
We have done something similar, at least the technique of using film caps
We boosted the loop bandwidth by 5 times of a power supply by carefully changing the circuit around the regulator IC. Thus we could reduce the bulk capacity many fold
In this article they seem to be talking about predictive feed forward control, so tighten the excursion during load steps
Nothing new about that, 100 dreds of papers about that, many stating âNovelâ. Novel = shitty đ
I normally skip any article with Novel in the headline
Cheers
Klaus
We boosted the loop bandwidth by 5 times of a power supply by carefully changing the circuit around the regulator IC. Thus we could reduce the bulk capacity many fold
In this article they seem to be talking about predictive feed forward control, so tighten the excursion during load steps
Nothing new about that, 100 dreds of papers about that, many stating âNovelâ. Novel = shitty đ
I normally skip any article with Novel in the headline
Cheers
Klaus
W
Winfield Hill
Guest
bloggs.fredbloggs.fred@gmail.com wrote...
It appears to be about the use of film capacitors.
There was a pretty serious set of (expensive) film
caps visible in the Tesla Model 3 inverter teardown.
--
Thanks,
- Win
They're not really saying much about the new algorithm, it must be complex:
https://www.kit-technology.de/en/technology-proposals/details/664/
It appears to be about the use of film capacitors.
There was a pretty serious set of (expensive) film
caps visible in the Tesla Model 3 inverter teardown.
--
Thanks,
- Win
W
Winfield Hill
Guest
Klaus Kragelund wrote...
Did this mean you had to raise the switching frequency by 5x?
Can you give us some more juicy details?
--
Thanks,
- Win
We have done something similar, at least the technique of using film caps
We boosted the loop bandwidth by 5 times of a power supply by carefully
changing the circuit around the regulator IC. Thus we could reduce the
bulk capacity many fold
Did this mean you had to raise the switching frequency by 5x?
Can you give us some more juicy details?
--
Thanks,
- Win
J
Jon Elson
Guest
On Fri, 10 May 2019 09:12:42 -0700, bloggs.fredbloggs.fred wrote:
What I got was they are replacing the electrolytic capacitors with film
capacitors, as big electrolytics in power supplies do have a limited
lifetime. And, the trick must be to make it work with a lot less
capacitance.
Jon
They're not really saying much about the new algorithm, it must be
complex:
https://www.kit-technology.de/en/technology-proposals/details/664/
What I got was they are replacing the electrolytic capacitors with film
capacitors, as big electrolytics in power supplies do have a limited
lifetime. And, the trick must be to make it work with a lot less
capacitance.
Jon
Guest
On Friday, 10 May 2019 19:00:40 UTC+2, Winfield Hill wrote:
This also has an effect on the startup behavior, since the output will ramp up much faster. So secondary compensator needs to be fast also. Lastly, when smaller caps are used, load changes has no energy storage, so they propagate faster to the primary side, so OCP may need to be redesigned, since a normal converter allows for short time overload
Cheers
Klaus
Cheers
Klaus
Klaus Kragelund wrote...
We have done something similar, at least the technique of using film caps
We boosted the loop bandwidth by 5 times of a power supply by carefully
changing the circuit around the regulator IC. Thus we could reduce the
bulk capacity many fold
Did this mean you had to raise the switching frequency by 5x?
Can you give us some more juicy details?
In most electronics, electrolytic caps determines the lifetime, so for a stepdown converter we changed the output caps to film, thus for same cost, but 10x lifetime, we needed much lower capacitance. Stability can be achieved by speeding up the feedback loop, speeding up the opto i the FB path (done by cascoding it), tricking the FB circuit inside the controller, also by cascoding it
This also has an effect on the startup behavior, since the output will ramp up much faster. So secondary compensator needs to be fast also. Lastly, when smaller caps are used, load changes has no energy storage, so they propagate faster to the primary side, so OCP may need to be redesigned, since a normal converter allows for short time overload
Cheers
Klaus
Cheers
Klaus