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Inductor current can't be suddenly cutoff if no freewheel diode is attached

Started by Patrick Chung September 2, 2013
Inductor current can't be suddenly cutoff  if no freewheel diode is attached. New tutorial is ready

http://www.cirvirlab.com/index.php/tutorials/105-r-l-circuit-with-mosfet-as-switch-and-freewheel-diode.html 

and online simulation

http://www.cirvirlab.com/simulation/r-l_circuit_with_mosfet_as_switch_and_freewheel_diode.php
Patrick Chung wrote:
> Inductor current can't be suddenly cutoff if no freewheel diode is attached. New tutorial is ready > > http://www.cirvirlab.com/index.php/tutorials/105-r-l-circuit-with-mosfet-as-switch-and-freewheel-diode.html > > and online simulation > > http://www.cirvirlab.com/simulation/r-l_circuit_with_mosfet_as_switch_and_freewheel_diode.php
NOT true! Look a ten million or so car ignition systems since the late 1800's.
On Mon, 02 Sep 2013 10:43:09 -0700, Robert Baer
<robertbaer@localnet.com> wrote:

>Patrick Chung wrote: >> Inductor current can't be suddenly cutoff if no freewheel diode is attached. New tutorial is ready >> >> http://www.cirvirlab.com/index.php/tutorials/105-r-l-circuit-with-mosfet-as-switch-and-freewheel-diode.html >> >> and online simulation >> >> http://www.cirvirlab.com/simulation/r-l_circuit_with_mosfet_as_switch_and_freewheel_diode.php > NOT true! > Look a ten million or so car ignition systems since the late 1800's.
Depends on your definition of "suddenly" >:-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
On Mon, 2 Sep 2013 05:49:20 -0700 (PDT), Patrick Chung
<pchung705@gmail.com> wrote:

>Inductor current can't be suddenly cutoff if no freewheel diode is attached. New tutorial is ready > >http://www.cirvirlab.com/index.php/tutorials/105-r-l-circuit-with-mosfet-as-switch-and-freewheel-diode.html > >and online simulation > >http://www.cirvirlab.com/simulation/r-l_circuit_with_mosfet_as_switch_and_freewheel_diode.php
Seems we now have an inordinate number of imbeciles issuing "tutorials" on subjects for which they have no clue. A product of the "education" system and googlegroups? I blanket killfile googlegroups and gmail posters, making it trivial to whitelist the remaining handful of intelligent beings that post from there. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
On 3/09/2013 4:44 AM, Jim Thompson wrote:
> On Mon, 02 Sep 2013 10:43:09 -0700, Robert Baer > <robertbaer@localnet.com> wrote: > >> Patrick Chung wrote: >>> Inductor current can't be suddenly cutoff if no freewheel diode is attached. New tutorial is ready >>> >>> http://www.cirvirlab.com/index.php/tutorials/105-r-l-circuit-with-mosfet-as-switch-and-freewheel-diode.html >>> >>> and online simulation >>> >>> http://www.cirvirlab.com/simulation/r-l_circuit_with_mosfet_as_switch_and_freewheel_diode.php >> NOT true! >> Look a ten million or so car ignition systems since the late 1800's. > > Depends on your definition of "suddenly" >:-} > > ...Jim Thompson >
Or indeed, on your definition of cut off. Sylvia.
On Tue, 03 Sep 2013 12:01:57 +1000, Sylvia Else
<sylvia@not.at.this.address> wrote:

>On 3/09/2013 4:44 AM, Jim Thompson wrote: >> On Mon, 02 Sep 2013 10:43:09 -0700, Robert Baer >> <robertbaer@localnet.com> wrote: >> >>> Patrick Chung wrote: >>>> Inductor current can't be suddenly cutoff if no freewheel diode is attached. New tutorial is ready >>>> >>>> http://www.cirvirlab.com/index.php/tutorials/105-r-l-circuit-with-mosfet-as-switch-and-freewheel-diode.html >>>> >>>> and online simulation >>>> >>>> http://www.cirvirlab.com/simulation/r-l_circuit_with_mosfet_as_switch_and_freewheel_diode.php >>> NOT true! >>> Look a ten million or so car ignition systems since the late 1800's. >> >> Depends on your definition of "suddenly" >:-} >> >> ...Jim Thompson >> > >Or indeed, on your definition of cut off. > >Sylvia.
Oh, please! Oh, please! Don't cut it off >:-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
On Tue, 03 Sep 2013 12:01:57 +1000, the renowned Sylvia Else
<sylvia@not.at.this.address> wrote:

>On 3/09/2013 4:44 AM, Jim Thompson wrote: >> On Mon, 02 Sep 2013 10:43:09 -0700, Robert Baer >> <robertbaer@localnet.com> wrote: >> >>> Patrick Chung wrote: >>>> Inductor current can't be suddenly cutoff if no freewheel diode is attached. New tutorial is ready >>>> >>>> http://www.cirvirlab.com/index.php/tutorials/105-r-l-circuit-with-mosfet-as-switch-and-freewheel-diode.html >>>> >>>> and online simulation >>>> >>>> http://www.cirvirlab.com/simulation/r-l_circuit_with_mosfet_as_switch_and_freewheel_diode.php >>> NOT true! >>> Look a ten million or so car ignition systems since the late 1800's. >> >> Depends on your definition of "suddenly" >:-} >> >> ...Jim Thompson >> > >Or indeed, on your definition of cut off. > >Sylvia.
Or even your definition of "inductor current". Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
On Mon, 02 Sep 2013 10:43:09 -0700, Robert Baer <robertbaer@localnet.com> wrote:

>Patrick Chung wrote: >> Inductor current can't be suddenly cutoff if no freewheel diode is attached. New tutorial is ready >> >> http://www.cirvirlab.com/index.php/tutorials/105-r-l-circuit-with-mosfet-as-switch-and-freewheel-diode.html >> >> and online simulation >> >> http://www.cirvirlab.com/simulation/r-l_circuit_with_mosfet_as_switch_and_freewheel_diode.php > NOT true! > Look a ten million or so car ignition systems since the late 1800's.
It's hard to build a practical boost converter with over 20:1 or so step-up ratio. At some point, the flyback swing charges up all the circuit capacitance, mosfet and winding capacitance, and you can't get any higher. Magnetic losses don't help, either. And you can buy avalanche-rated mosfets and bipolars. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
On Tuesday, 3 September 2013 12:41:48 UTC+10, John Larkin  wrote:
> On Mon, 02 Sep 2013 10:43:09 -0700, Robert Baer <robertbaer@localnet.com>=
=20
> wrote:=20 > >Patrick Chung wrote: >=20 > >> Inductor current can't be suddenly cutoff if no freewheel diode is=20 > >>attached. New tutorial is ready=20 > >>=20 > >> http://www.cirvirlab.com/index.php/tutorials/105-r-l-circuit-with-mosf=
et-
> >> as-switch-and-freewheel-diode.html > >> > >> and online simulation=20 > >>=20 > >> http://www.cirvirlab.com/simulation > >> /r-l_circuit_with_mosfet_as_switch_and_freewheel_diode.php > > NOT true! > > Look a ten million or so car ignition systems since the late 1800's. > > It's hard to build a practical boost converter with over 20:1 or so step-=
up=20
> ratio. At some point, the flyback swing charges up all the circuit=20 > capacitance, mosfet and winding capacitance, and you can't get any higher=
. =20
> Magnetic losses don't help, either. > =20 > And you can buy avalanche-rated mosfets and bipolars.
As has been said, car ignition systems do better than 20:1. The transformers are wound for low inter-winding capacitance. Mimimun is su= pposed to be single-layer winding with the wires spaced by about their own = diameter, but it's hard to get much inductance that way, unless you build s= omething quite big - as Nickola Tesla did - but "banked" windings do help. --=20 Bill Sloman, Sydney
On Monday, September 2, 2013 10:20:13 PM UTC+2, Jim Thompson wrote:
> On Mon, 2 Sep 2013 05:49:20 -0700 (PDT), Patrick Chung >=20 > <pchung705@gmail.com> wrote: >=20 >=20 >=20 > >Inductor current can't be suddenly cutoff if no freewheel diode is atta=
ched. New tutorial is ready
>=20 > > >=20 > >http://www.cirvirlab.com/index.php/tutorials/105-r-l-circuit-with-mosfet=
-as-switch-and-freewheel-diode.html=20
>=20 > > >=20 > >and online simulation >=20 > > >=20 > >http://www.cirvirlab.com/simulation/r-l_circuit_with_mosfet_as_switch_an=
d_freewheel_diode.php
>=20 >=20 >=20 > Seems we now have an inordinate number of imbeciles issuing >=20 > "tutorials" on subjects for which they have no clue. >=20 >=20 >=20 > A product of the "education" system and googlegroups? >=20 >=20 >=20 > I blanket killfile googlegroups and gmail posters, making it trivial >=20 > to whitelist the remaining handful of intelligent beings that post >=20 > from there. >=20
The reason the OP posted it was to get people to check the link out. His (o= r hers) banner commercials then earned 10cents per click Want to earn relatively easy money? - copy very popular websites on the net= , and add banner commercials. Make sure to register keywords to Google.com Sit back and watch the flow of money (granted this was easier 5-10 years ag= o) Sk=E5l Klaus