Forums

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

Started by Patrick Chung September 2, 2013
On Tue, 03 Sep 2013 02:51:04 -0700, Klaus Kragelund wrote:

> 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 >> >> <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. >> > The reason the OP posted it was to get people to check the link out. His > (or 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 > ago) > >
I should imagine that most people here use ad- and popup-blockers. Sort of makes it a bit pointless, his posting here. I had to look at my blocked items window to see the google syndication script hiding there. As to those who don't block gratuitous ads, they have only themselves to blame. -- "Design is the reverse of analysis" (R.D. Middlebrook)
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.
This CD-type (IRL) makes 300V from +4V... http://www.analog-innovations.com/SED/CD-Ignition-Basic.pdf ...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.
Jim Thompson wrote:
> 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
Will there be a song now "Do the Bobbit?
Klaus Kragelund wrote:
> 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 >> >> <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. >> > The reason the OP posted it was to get people to check the link out. His (or 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 ago) > > Sk&#2013265925;l > > Klaus
Twitter!!
On Wed, 04 Sep 2013 20:57:37 -0800, Robert Baer
<robertbaer@localnet.com> wrote:

>Jim Thompson wrote: >> 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 > Will there be a song now "Do the Bobbit?
>:-} ...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 Wed, 04 Sep 2013 20:57:37 -0800, Robert Baer
<robertbaer@localnet.com> wrote:

>Jim Thompson wrote: >> 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 > Will there be a song now "Do the Bobbit?
It's interesting that, whenever a woman posts here, there are guys, presumably either horny teenagers or senile old gits, who start up snarky sexual innuendo. They're not even very good at it. See the same thing in s.e.b. -- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
On Thu, 05 Sep 2013 10:57:19 -0700, John Larkin
<jlarkin@highlandtechnology.com> wrote:

>On Wed, 04 Sep 2013 20:57:37 -0800, Robert Baer ><robertbaer@localnet.com> wrote: > >>Jim Thompson wrote: >>> 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 >> Will there be a song now "Do the Bobbit? > >It's interesting that, whenever a woman posts here, there are guys, >presumably either horny teenagers or senile old gits, who start up >snarky sexual innuendo. They're not even very good at it. > >See the same thing in s.e.b.
Designed any "cute" circuits lately ?:-) ...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 Thu, 05 Sep 2013 11:04:09 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

>On Thu, 05 Sep 2013 10:57:19 -0700, John Larkin ><jlarkin@highlandtechnology.com> wrote: > >>On Wed, 04 Sep 2013 20:57:37 -0800, Robert Baer >><robertbaer@localnet.com> wrote: >> >>>Jim Thompson wrote: >>>> 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 >>> Will there be a song now "Do the Bobbit? >> >>It's interesting that, whenever a woman posts here, there are guys, >>presumably either horny teenagers or senile old gits, who start up >>snarky sexual innuendo. They're not even very good at it. >> >>See the same thing in s.e.b. > >Designed any "cute" circuits lately ?:-) > > ...Jim Thompson
https://dl.dropboxusercontent.com/u/53724080/Optos/D140_and_Fixture.jpg The big board is the test fixture. The little board (I think 0.75x2" qualifies as "cute") is a 150+ amp, 4ish kilowatt precision laser driver, with onboard boost-doubler converter. The one that you didn't like. https://dl.dropboxusercontent.com/u/53724080/Optos/D140_200A_Pulse.JPG The Brat did beautiful PCB layouts on these. They both worked first time. The customer connected +10 to the 5 volt supply and blew up the first one that we shipped, but these things happen. Currently I'm working on an active magnetic field shield, an aircraft engine transducer simulator, some thermal stuff for an EUV photodiode digitizer, and some optical stuff having to do with semiconductor fab. And still tweaking my shrimp-and-grits and bread pudding recipes. How about you? Still working? -- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
On Thu, 05 Sep 2013 11:21:01 -0700, John Larkin
<jlarkin@highlandtechnology.com> wrote:

>On Thu, 05 Sep 2013 11:04:09 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: > >>On Thu, 05 Sep 2013 10:57:19 -0700, John Larkin >><jlarkin@highlandtechnology.com> wrote: >> >>>On Wed, 04 Sep 2013 20:57:37 -0800, Robert Baer >>><robertbaer@localnet.com> wrote: >>> >>>>Jim Thompson wrote: >>>>> 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 >>>> Will there be a song now "Do the Bobbit? >>> >>>It's interesting that, whenever a woman posts here, there are guys, >>>presumably either horny teenagers or senile old gits, who start up >>>snarky sexual innuendo. They're not even very good at it. >>> >>>See the same thing in s.e.b. >> >>Designed any "cute" circuits lately ?:-) >> >> ...Jim Thompson > >https://dl.dropboxusercontent.com/u/53724080/Optos/D140_and_Fixture.jpg > >The big board is the test fixture. The little board (I think 0.75x2" >qualifies as "cute") is a 150+ amp, 4ish kilowatt precision laser >driver, with onboard boost-doubler converter. The one that you didn't >like. > >https://dl.dropboxusercontent.com/u/53724080/Optos/D140_200A_Pulse.JPG > >The Brat did beautiful PCB layouts on these. They both worked first >time. The customer connected +10 to the 5 volt supply and blew up the >first one that we shipped, but these things happen. > >Currently I'm working on an active magnetic field shield, an aircraft >engine transducer simulator, some thermal stuff for an EUV photodiode >digitizer, and some optical stuff having to do with semiconductor fab. >And still tweaking my shrimp-and-grits and bread pudding recipes. > >How about you? Still working?
Yep. Still cranking out custom chips. Will you show us the final schematic of the boost-doubler? As originally posted it _did_ have problems. ...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 Thu, 05 Sep 2013 11:28:30 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

>On Thu, 05 Sep 2013 11:21:01 -0700, John Larkin ><jlarkin@highlandtechnology.com> wrote: > >>On Thu, 05 Sep 2013 11:04:09 -0700, Jim Thompson >><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >> >>>On Thu, 05 Sep 2013 10:57:19 -0700, John Larkin >>><jlarkin@highlandtechnology.com> wrote: >>> >>>>On Wed, 04 Sep 2013 20:57:37 -0800, Robert Baer >>>><robertbaer@localnet.com> wrote: >>>> >>>>>Jim Thompson wrote: >>>>>> 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 >>>>> Will there be a song now "Do the Bobbit? >>>> >>>>It's interesting that, whenever a woman posts here, there are guys, >>>>presumably either horny teenagers or senile old gits, who start up >>>>snarky sexual innuendo. They're not even very good at it. >>>> >>>>See the same thing in s.e.b. >>> >>>Designed any "cute" circuits lately ?:-) >>> >>> ...Jim Thompson >> >>https://dl.dropboxusercontent.com/u/53724080/Optos/D140_and_Fixture.jpg >> >>The big board is the test fixture. The little board (I think 0.75x2" >>qualifies as "cute") is a 150+ amp, 4ish kilowatt precision laser >>driver, with onboard boost-doubler converter. The one that you didn't >>like. >> >>https://dl.dropboxusercontent.com/u/53724080/Optos/D140_200A_Pulse.JPG >> >>The Brat did beautiful PCB layouts on these. They both worked first >>time. The customer connected +10 to the 5 volt supply and blew up the >>first one that we shipped, but these things happen. >> >>Currently I'm working on an active magnetic field shield, an aircraft >>engine transducer simulator, some thermal stuff for an EUV photodiode >>digitizer, and some optical stuff having to do with semiconductor fab. >>And still tweaking my shrimp-and-grits and bread pudding recipes. >> >>How about you? Still working? > >Yep. Still cranking out custom chips. > >Will you show us the final schematic of the boost-doubler? As >originally posted it _did_ have problems. > > ...Jim Thompson
What problems? This is essentially the same as the "bubbler" circuit I posted previously. Here's the (censored) schematic of the real thing: https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/Boost-Doubler.pdf It's tiny and it works great. It's simple, efficient, and very tunable. The current pulled from the customer's supply, during chargeup or recharge, is nearly flat and is easily settable. -- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation