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Groups > sci.electronics.design > #455912
| From | Winfield Hill <hill@rowland.harvard.edu> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Achieving 98% efficiency in a boost converter, RIS-767 |
| Date | 2017-04-12 10:12 -0700 |
| Organization | Rowland Institute |
| Message-ID | <ocln6c02b1@drn.newsguy.com> (permalink) |
| References | (6 earlier) <eivt8jFhg6bU1@mid.individual.net> <oaeiph0kkc@drn.newsguy.com> <bkvtccpo9mbm2k5ifa64l94saitrdhhbm3@4ax.com> <oan193062o@drn.newsguy.com> <v4jsecli9lgmaepo1fvgoajqpe1tp93p9t@4ax.com> |
legg wrote...
>
>On 19 Mar 2017 15:38:27 -0700, Winfield Hill
><hill@rowland.harvard.edu> wrote:
>
>>legg wrote...
>>>
>>> Winfield Hill wrote:
>>>> Joerg wrote...
>>>>>
>>>>> If the MPPT is a required part of the game
>>>>> you'd have to add in the Arduino power
>>>>> consumption. Maybe use a MSP430 instead?
>>>>> Those can be operated on small drops of power.
>>>>
>>>> Of course. But my rule is that none of the
>>>> controller power consumption counts. Why?
>>>> We assume with effort you could drive that
>>>> as far down as you want, but that's not
>>>> the point. The point is to achieve very
>>>> efficient power conversion, period. Any
>>>> wild control scheme you dream up is OK.
>>>
>>> Scaling assumptions that approach an order
>>> of magnitude are often troublesome. Two
>>> orders of magnitude will require more than
>>> just serious thought.
>>
>> Yes, right. And also bench experimenting.
>> Hence my offer for free RIS-767 boards.
>
> What's the solar cell source unloaded output
> voltage? With 600mV loaded, I'd expect >900mV?
> If so,
>
>https://datasheets.maximintegrated.com/en/ds/MAX17220-MAX17225.pdf
Right. Quite a few boost converters claim to
achieve 95% under certain circumstances.
I purchased eval boards for about 10 of them,
but wasn't able to get better than 90% for my
2.0 to 2.4-volt boost. One did 92-94% at 25mW
with 0.8 volts in, but strangely deteriorated
at 2.0 volts in. In many cases it appeared the
eval board inductors were too small. First,
too low a value, and second, too much core loss.
It seems the manufacturers just want to prove
how small their overall used space will be.
So I have footprints for about a dozen inductor
types. I also wound an RM8-core inductor, that
measured to fit into a 98% budget (next post),
so I think that part of the scene is possible.
Another big part is the MOSFET's tradoff, for
Ron and Coss. Low Ron goes along with high
Coss, and thus high C V^2 f losses.
Having a variable frequency with load, as the
Maxim parts do, helps out with that problem.
--
Thanks,
- Win
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Re: Achieving 98% efficiency in a boost converter, inducement Winfield Hill <hill@rowland.harvard.edu> - 2017-03-09 07:21 -0800
Re: Achieving 98% efficiency in a boost converter, inducement Winfield Hill <hill@rowland.harvard.edu> - 2017-03-09 08:29 -0800
Re: Achieving 98% efficiency in a boost converter, inducement Don Kuenz <g@crcomp.net> - 2017-03-09 21:30 +0000
Re: Achieving 98% efficiency in a boost converter, inducement Winfield Hill <hill@rowland.harvard.edu> - 2017-03-09 13:59 -0800
Re: Achieving 98% efficiency in a boost converter, inducement Winfield Hill <hill@rowland.harvard.edu> - 2017-03-10 05:30 -0800
Re: Achieving 98% efficiency in a boost converter, deadline Winfield Hill <hill@rowland.harvard.edu> - 2017-03-10 05:34 -0800
Re: Achieving 98% efficiency in a boost converter, deadline sea moss <danluster81@gmail.com> - 2017-03-10 21:10 -0800
Re: Achieving 98% efficiency in a boost converter, deadline Winfield Hill <hill@rowland.harvard.edu> - 2017-03-11 05:40 -0800
Re: Achieving 98% efficiency in a boost converter, RIS-767, new 11-page document Winfield Hill <hill@rowland.harvard.edu> - 2017-03-16 07:55 -0700
Re: Achieving 98% efficiency in a boost converter, inducement Joerg <news@analogconsultants.com> - 2017-03-16 08:08 -0700
Re: Achieving 98% efficiency in a boost converter, inducement Winfield Hill <hill@rowland.harvard.edu> - 2017-03-16 08:54 -0700
Re: Achieving 98% efficiency in a boost converter, inducement Joerg <news@analogconsultants.com> - 2017-03-16 09:36 -0700
Re: Achieving 98% efficiency in a boost converter, inducement Winfield Hill <hill@rowland.harvard.edu> - 2017-03-16 10:42 -0700
Re: Achieving 98% efficiency in a boost converter, inducement legg <legg@nospam.magma.ca> - 2017-03-19 17:58 -0400
Re: Achieving 98% efficiency in a boost converter, RIS-767 Winfield Hill <hill@rowland.harvard.edu> - 2017-03-19 15:38 -0700
Re: Achieving 98% efficiency in a boost converter, RIS-767 legg <legg@nospam.magma.ca> - 2017-03-22 21:49 -0400
Re: Achieving 98% efficiency in a boost converter, RIS-767 legg <legg@nospam.magma.ca> - 2017-04-12 11:52 -0400
Re: Achieving 98% efficiency in a boost converter, RIS-767 Winfield Hill <hill@rowland.harvard.edu> - 2017-04-12 10:12 -0700
Re: Achieving 98% efficiency in a boost converter, RIS-767 Joerg <news@analogconsultants.com> - 2017-04-12 10:26 -0700
Re: Achieving 98% efficiency in a boost converter, RIS-767 legg <legg@nospam.magma.ca> - 2017-04-12 17:24 -0400
Re: Achieving 98% efficiency in a boost converter, RIS-767 Joerg <news@analogconsultants.com> - 2017-04-13 07:13 -0700
Re: Achieving 98% efficiency in a boost converter, RIS-767 Winfield Hill <hill@rowland.harvard.edu> - 2017-04-12 10:29 -0700
Re: Achieving 98% efficiency in a boost converter, RIS-767 legg <legg@nospam.magma.ca> - 2017-04-12 17:07 -0400
Re: Achieving 98% efficiency in a boost converter, RIS-767 Winfield Hill <hill@rowland.harvard.edu> - 2017-04-13 08:22 -0700
Re: Achieving 98% efficiency in a boost converter, RIS-767 legg <legg@nospam.magma.ca> - 2017-04-22 16:58 -0400
Re: Achieving 98% efficiency in a boost converter, RIS-767 Winfield Hill <hill@rowland.harvard.edu> - 2017-05-01 15:08 -0700
Re: Achieving 98% efficiency in a boost converter, RIS-767 Winfield Hill <hill@rowland.harvard.edu> - 2017-05-05 13:27 -0700
Re: Achieving 98% efficiency in a boost converter, RIS-767 Don Kuenz <g@crcomp.net> - 2017-05-06 05:31 +0000
Re: Achieving 98% efficiency in a boost converter, RIS-767 dagmargoodboat@yahoo.com - 2017-05-07 14:49 -0700
Re: Achieving 98% efficiency in a boost converter, RIS-767 Winfield Hill <hill@rowland.harvard.edu> - 2017-05-08 12:05 -0700
Re: Achieving 98% efficiency in a boost converter, RIS-767 sea moss <danluster81@gmail.com> - 2017-05-08 18:50 -0700
Re: Achieving 98% efficiency in a boost converter, RIS-767 Winfield Hill <hill@rowland.harvard.edu> - 2017-05-08 19:27 -0700
Re: Achieving 98% efficiency in a boost converter, inducement George Herold <gherold@teachspin.com> - 2017-03-22 19:38 -0700
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