Groups > linux.debian.user > #162035

Re: Need a calculator that knows about coulombs

From	Joe <joe@jretrading.com>
Newsgroups	linux.debian.user
Subject	Re: Need a calculator that knows about coulombs
Date	2015-12-23 12:50 +0100
Message-ID	<qIQ5A-Cl-19@gated-at.bofh.it> (permalink)
References	<qIGfT-35d-13@gated-at.bofh.it> <qIGIV-3eA-3@gated-at.bofh.it> <qIH2h-3Ai-7@gated-at.bofh.it> <qIOwO-8gG-23@gated-at.bofh.it>
Organization	JRE Trading Ltd

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On Wed, 23 Dec 2015 05:09:18 -0500
Gene Heskett <gheskett@shentel.net> wrote:

> On Tuesday 22 December 2015 21:02:31 John Hasler wrote:
> 
> > Gene Heskett writes:  
> > > In this case, the size of a capacitor hooked to a square wave
> > > source, and I want to know how much charge is transfered for every
> > > full cycle of the input square wave.  
> >
> > Zero assuming linear source and load impedence.  
> 
> Ahh, but its being fed to a voltage-doubler with schottky diodes, so 
> there should be a calculatable amount of charge delivered to the
> output capacitor Cf, by the pump capacitor Cp, per cycle.  With Cp
> being of a capacity such that with the usual logic circuits output
> impedance, capable of delivering 10 to 20 milliamps into a resistive
> load, IOW not a zero impedance source. Cf would be sized such as to
> be about 50x Cp, and will be driving an enhancement mode fet which
> will turn on a 40 amp SSR once the charge has built up on Cf to make
> the fet conduct.
> 
>
Do it numerically with a spreadsheet.

It takes a while with any reasonably-sized spreadsheet, but you can
trust the result, you can see every stage and can spot anything
obviously wrong.

I once needed to analyse the start-up surge into a large capacitance
using a toroidal mains transformer, and given the non-linearity of the
rectifiers, I could see no other way. When results can reach hundreds of
amps for a millisecond or so, you don't want large piecewise-linear
approximations.

-- 
Joe

Thread

Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-23 02:20 +0100
  Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-23 02:40 +0100
  Re: Need a calculator that knows about coulombs Jimmy Johnson <jimmyjhn@gmail.com> - 2015-12-23 02:40 +0100
    Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-23 02:50 +0100
      Re: Need a calculator that knows about coulombs John Hasler <jhasler@newsguy.com> - 2015-12-23 03:10 +0100
        Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-23 11:10 +0100
          Re: Need a calculator that knows about coulombs Joe <joe@jretrading.com> - 2015-12-23 12:50 +0100
            Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-23 16:10 +0100
          Re: Need a calculator that knows about coulombs David Christensen <dpchrist@holgerdanske.com> - 2015-12-23 19:30 +0100
            Re: Need a calculator that knows about coulombs John Hasler <jhasler@newsguy.com> - 2015-12-23 20:10 +0100
            Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-23 20:20 +0100
              Re: Need a calculator that knows about coulombs John Hasler <jhasler@newsguy.com> - 2015-12-23 20:40 +0100
                Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-23 22:20 +0100
                Re: Need a calculator that knows about coulombs John Hasler <jhasler@newsguy.com> - 2015-12-24 01:30 +0100
                Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-24 02:40 +0100
                Re: Need a calculator that knows about coulombs Bob Bernstein <poobah@ruptured-duck.com> - 2015-12-24 02:10 +0100
                Re: Need a calculator that knows about coulombs John Hasler <jhasler@newsguy.com> - 2015-12-24 02:40 +0100
                Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-24 03:00 +0100
                Re: Need a calculator that knows about coulombs John Hasler <jhasler@newsguy.com> - 2015-12-24 03:20 +0100
                Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-24 04:50 +0100
                Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-24 02:50 +0100
                Re: Need a calculator that knows about coulombs Bob Bernstein <poobah@ruptured-duck.com> - 2015-12-24 03:10 +0100
                Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-24 04:40 +0100
                Re: Need a calculator that knows about coulombs Lisi Reisz <lisi.reisz@gmail.com> - 2015-12-24 12:30 +0100
                Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-24 16:40 +0100
        Re: Need a calculator that knows about coulombs Gary Roach <gary719_list1@verizon.net> - 2015-12-24 01:00 +0100
          Re: Need a calculator that knows about coulombs John Hasler <jhasler@newsguy.com> - 2015-12-24 01:40 +0100
            Re: Need a calculator that knows about coulombs Anders Andersson <pipatron@gmail.com> - 2015-12-24 01:40 +0100
          Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-24 02:40 +0100
      Re: Need a calculator that knows about coulombs David Christensen <dpchrist@holgerdanske.com> - 2015-12-23 03:20 +0100
        Re: Need a calculator that knows about coulombs Bob Bernstein <poobah@ruptured-duck.com> - 2015-12-23 04:40 +0100
          Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-23 11:50 +0100
        Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-23 11:40 +0100
          Re: Need a calculator that knows about coulombs David Christensen <dpchrist@holgerdanske.com> - 2015-12-23 19:40 +0100
  Re: Need a calculator that knows about coulombs rlharris@oplink.net - 2015-12-23 02:40 +0100
  Re: Need a calculator that knows about coulombs John Hasler <jhasler@newsguy.com> - 2015-12-23 03:00 +0100
    Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-23 11:40 +0100
  Re: Need a calculator that knows about coulombs Charlie Kravetz <cjk@teamcharliesangels.com> - 2015-12-23 04:50 +0100
  Re: Need a calculator that knows about coulombs Jörg-Volker Peetz <jvpeetz@web.de> - 2015-12-23 15:00 +0100
    Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-23 16:20 +0100
      Re: Need a calculator that knows about coulombs Jörg-Volker Peetz <jvpeetz@web.de> - 2015-12-28 10:40 +0100
        Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-28 14:00 +0100
          Re: Need a calculator that knows about coulombs John Hasler <jhasler@newsguy.com> - 2015-12-28 18:40 +0100
            Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-28 21:00 +0100
  Re: Need a calculator that knows about coulombs Gener Badenas <gener.ong.badenas@gmail.com> - 2015-12-28 08:10 +0100
    Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-28 13:20 +0100
      Re: Need a calculator that knows about coulombs Joel Rees <joel.rees@gmail.com> - 2015-12-29 09:40 +0100
        Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-29 10:50 +0100
      Re: Need a calculator that knows about coulombs Joel Rees <joel.rees@gmail.com> - 2015-12-29 12:00 +0100
        Re: Need a calculator that knows about coulombs Joel Rees <joel.rees@gmail.com> - 2015-12-29 12:10 +0100
          Re: Need a calculator that knows about coulombs Gene Heskett <gheskett@shentel.net> - 2015-12-29 16:50 +0100
    Re: Need a calculator that knows about coulombs ken <gebser@mousecar.com> - 2016-01-03 12:00 +0100

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