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Groups > sci.electronics.design > #450978
| From | Winfield Hill <hill@rowland.harvard.edu> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Achieving 98% efficiency in a boost converter, inducement |
| Date | 2017-03-09 07:21 -0800 |
| Organization | Rowland Institute |
| Message-ID | <o9rrt10mar@drn.newsguy.com> (permalink) |
| References | <nvvrni02lg2@drn.newsguy.com> <275abfbe-5306-41d3-a184-8b0372ca77d7@googlegroups.com> <o060su0265c@drn.newsguy.com> |
Winfield Hill wrote...
>
> dagmargoodboat@yahoo.com wrote...
>>
>> On November 9, 2016 at 6:54:04 PM UTC-5, Winfield Hill wrote:
>>> Anybody care to speculate about the most important aspects to consider
>>> when trying to achieve 98% efficiency in a low-power (20mW) boost
>>> converter? Most available step-up converter circuits seem to perform
>>> in the 85 to 90% region.
>>>
>>> I'm finishing a PCB "test bed" layout, which allows jumper-selection
>>> of different inductors, synchronous switches, and adjustable controller
>>> parameters. I'm hoping not to forget something important before
>>> sending it off to the PCB house. Just for fun I thought I'd make it
>>> in the form of an Arduino shield; giving an option for the processor
>>> to control the parameters and take measurements.
>>
>> Too many degrees of freedom to answer you Win [ snip ]
>
> Thanks, your comments are right on target and can kick
> off the discussion I was hoping to see. I'll get into
> that conversation tomorrow. But in the meantime I've
> updated my draft schematic and PCB layout, adding more
> features and items relevant to the discussion.
>
> Here's an inducement: anyone who'd like to experiment
> with issues and concepts embedded in the RIS-767
> board, I'll send you two blank PCBs to play with.
> You just have to talk about what you learn, should
> you get around to learning anything!
The design has been updated and is ready to order.
https://www.dropbox.com/s/hhl1mwq7mjeo622/RIS-767_b_sch%2Blayouy-pics.pdf?dl=0
Here's what my document says, achieving a 98% result:
One test condition: 600mV input from a solar cell,
2.4V out at 10mA load = 24mW. Boost converter
operation at 250kHz. Critical for success: an RM8
inductor, low-loss winding, measured DCR 0.018 Ω,
calculated loss 0.03mW, and AC loss 1.3 Ω, 0.06mW.
Best estimated CMOS switch, TS3A24159 powered from
Vcc = 3.3V. Ron 0.10 Ω, loss 0.16mW. Calculated
switch loss, switching 2.4V with Coss=150pF, 0.21mW.
Continuous total loss 0.46mW = 2% of 24mW (not
counting 0.18mW in sense resistors).
I had only one email about a free PCB, but with no
followup to my answer. My offer still stands.
--
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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