cool high voltage generator

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Jim Thompson 12 years ago

You miss the point, '0' is not "ground", it is "global common", and has no business being used within a subcircuit. If something in a subcircuit should connect to true circuit ground, it should come out on a pin (and NOT be named '0'). Subcircuits that mistakenly use '0' will produce bizarre results if not powered (Vcc,Vee) conventionally.

Disclaimer: On occasion I will "sit" an otherwise floating piece of behavioral math on '0', but it has no effect on any subcircuit pin current flow. This is _not_ a method for amateurs.

You're posting almost everything you do now-a-days as an LTspice schematic, then ignoring any flaws the simulation tells you >:-} ...Jim Thompson

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Spehro Pefhany 12 years ago

Yes, the flux is fixed, so if the current path changes then the inductance changes, so the actual current flowing must change to compensate. Took me a while to wrap my brain around it.

Spice doesn't know how to deal with persistent currents.

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John Larkin 12 years ago

Can't you charge up an inductor and then short it?

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

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Spehro Pefhany 12 years ago

That simple circuit probably works, but when you include a bit more of reality, you get stuff like:

"Voltage source and/or inductor loop involving L_L2 You may break the loop by adding a series resistance"

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

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Jim Thompson 12 years ago

See...

From: Jim Thompson Newsgroups: alt.binaries.schematics.electronic Subject: COOL HV Generator ala Larkin - COOL_HV_ala_Larkin.png Date: Wed, 18 Sep 2013 10:16:15 -0700 Message-ID:

for the cause of the strange behavior. ...Jim Thompson

formatting link

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

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Jim Thompson 12 years ago

Guffaw!

Maybe this is the problem...

.model Rnoise RES(T_abs=0) .model pmod pjf (beta=0.5e-2, T_abs=-10) .MODEL DX D (T_abs=0) .model dn d(kf=2e-12,af=1, T_abs=-4)

Note the temperatures ;-) ...Jim Thompson

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Jim Thompson 12 years ago

[snip]

That behavior was a red flag for wrong pin order in the subcircuit call.

Two lines if behavioral math passes load current to proper rail:

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cool high voltage generator

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