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Re: Achieving 98% efficiency in a boost converter, datasheets

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Jim Thompson wrote...
>
> On 12 Nov 2016, Winfield Hill wrote:
>
>> 4) I'm still looking hard for good inductor
>> candidates to add to the PCB.  Most have
>> appallingly-high losses, and unfortunately
>> these are not detailed on their datasheets.
>
> Large inductor and slow switching speed?

 So far measuring commercial inductors, that's
 all I've come up with.  Most have unacceptable
 losses at high frequencies.  One that should
 work is a TDK SL1720, a large 17mm D x 20mm H
 size.  The 1.5mH part is rated at 1 amp, and
 DCR = 0.86 ohms.  Its AC resistance measures
 3 ohms at 20kHz.  With D = 17% and ON time
 8.4us, dI = 8.4us 2.0V/1.5mH = 11 mApp, and
 the I^2 R loss would be about 0.125W, or 0.6%
 of my 24mW power.  Wait, that seems too low.

 I'd like to be able to scale this to higher
 frequencies, e.g. 100uH at 300kHz.  Could
 be, I have some candidate parts to test.


-- 
 Thanks,
    - Win

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Thread

Achieving 98% efficiency in a boost converter Winfield Hill <hill@rowland.harvard.edu> - 2016-11-09 11:00 -0800
  Re: Achieving 98% efficiency in a boost converter sea moss <danluster81@gmail.com> - 2016-11-09 20:12 -0800
  Re: Achieving 98% efficiency in a boost converter "Tim Williams" <tiwill@seventransistorlabs.com> - 2016-11-09 22:27 -0600
    Re: Achieving 98% efficiency in a boost converter bill.sloman@ieee.org - 2016-11-10 04:07 -0800
  Re: Achieving 98% efficiency in a boost converter Winfield Hill <hill@rowland.harvard.edu> - 2016-11-11 02:08 -0800
  Re: Achieving 98% efficiency in a boost converter dagmargoodboat@yahoo.com - 2016-11-11 13:44 -0800
    Re: Achieving 98% efficiency in a boost converter, inducement Winfield Hill <hill@rowland.harvard.edu> - 2016-11-11 19:05 -0800
      Re: Achieving 98% efficiency in a boost converter, datasheets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-12 04:06 -0800
        Re: Achieving 98% efficiency in a boost converter, datasheets dagmargoodboat@yahoo.com - 2016-11-12 05:40 -0800
          Re: Achieving 98% efficiency in a boost converter, datasheets dagmargoodboat@yahoo.com - 2016-11-12 05:54 -0800
          Re: Achieving 98% efficiency in a boost converter, datasheets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-12 06:33 -0800
            Re: Achieving 98% efficiency in a boost converter, datasheets Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2016-11-12 07:58 -0700
              Re: Achieving 98% efficiency in a boost converter, datasheets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-15 05:29 -0800
            Re: Achieving 98% efficiency in a boost converter, datasheets bill.sloman@ieee.org - 2016-11-12 20:08 -0800
              Re: Achieving 98% efficiency in a boost converter, datasheets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-13 18:29 -0800
          Re: Achieving 98% efficiency in a boost converter, datasheets Clifford Heath <no.spam@please.net> - 2016-11-13 09:08 +1100
            Re: Achieving 98% efficiency in a boost converter, datasheets dagmargoodboat@yahoo.com - 2016-11-12 16:48 -0800
              Re: Achieving 98% efficiency in a boost converter, datasheets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-16 18:00 -0800
                Re: Achieving 98% efficiency in a boost converter, datasheets bill.sloman@ieee.org - 2016-11-17 18:41 -0800
                Re: Achieving 98% efficiency in a boost converter, datasheets dagmargoodboat@yahoo.com - 2016-11-18 09:37 -0800
        Re: Achieving 98% efficiency in a boost converter, datasheets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-15 05:05 -0800
          Re: Achieving 98% efficiency in a boost converter, datasheets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-18 09:13 -0800

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