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

Inductor current can't be suddenly cutoff if no freewheel diode is attached. New tutorial is ready

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and online simulation

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Reply to
Patrick Chung
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NOT true! Look a ten million or so car ignition systems since the late 1800's.

Reply to
Robert Baer

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.
Reply to
Jim Thompson

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.
Reply to
Jim Thompson

Or indeed, on your definition of cut off.

Sylvia.

Reply to
Sylvia Else

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.
Reply to
Jim Thompson

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
Reply to
Spehro Pefhany

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
Reply to
John Larkin

et-

up

.

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.

--
Bill Sloman, Sydney
Reply to
Bill Sloman

ched. New tutorial is ready

d_freewheel_diode.php

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)

Skål

Klaus

Reply to
Klaus Kragelund

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)
Reply to
Fred Abse

This CD-type (IRL) makes 300V from +4V...

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...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.
Reply to
Jim Thompson

Will there be a song now "Do the Bobbit?

Reply to
Robert Baer

Twitter!!

Reply to
Robert Baer 

--
| 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.
Reply to
Jim Thompson

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
Reply to
John Larkin

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.
Reply to
Jim Thompson

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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.

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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
Reply to
John Larkin

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.
Reply to
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:

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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
Reply to
John Larkin

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