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Driver for IGBT? (-ve off and +ve on from CMOS)
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Ignoramus25589
electronics forum beginner


Joined: 13 Oct 2005
Posts: 13

PostPosted: Thu Oct 13, 2005 2:58 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On Thu, 13 Oct 2005 13:52:22 GMT, Glen Walpert <gwalpert@notaxs.com> wrote:
Quote:
On Thu, 13 Oct 2005 00:44:21 GMT, Ignoramus24489
ignoramus24489@NOSPAM.24489.invalid> wrote:

On Thu, 13 Oct 2005 00:04:40 GMT, Glen Walpert <gwalpert@notaxs.com> wrote:
On Wed, 12 Oct 2005 17:30:22 GMT, Ignoramus24489
ignoramus24489@NOSPAM.24489.invalid> wrote:

On Wed, 12 Oct 2005 17:24:36 GMT, Glen Walpert <gwalpert@notaxs.com> wrote:
On Wed, 12 Oct 2005 14:50:16 GMT, Ignoramus24489
ignoramus24489@NOSPAM.24489.invalid> wrote:

What if the bridge shorts instead of opens during th switching event?
Would that help?

Yes, see other posts. But it won't help with providing adequate EMI
immunity for your gate drive circuits, something the Semikron driver
design probably gave some consideration to.

I am confused. My plan for my inverter circuit is to place it BEFORE
the high voltage, high frequency arc starter circuit. I believe,
rightly or wrongly, that the HF unit is isolated from the power supply
in the sense of conducting interference. If I am mistaken, or am
thinking about a wrong issue, I will appreciate being corrected.

The HF is somewhat isolated from the existing SCR switches in the
inverter by the reactor, which also smoothes out the nasty switching
transients from the SCRs - while they are off the freewheeling diode
and the reactor inductance keeps the arc current going (but decaying,
to be boosted when the SCRs are on, thus the AC ripple on the output).
So before the reactor you see SCR switching transients, and after it
you see HF starting noise (if it is on, so don't turn it on) and arc
noise (unavoidable).

The electromagnetic fields from all those high currents being switched
will couple into every piece of wire in the general vicinity,
regardless of which side of the reactor you are on, unless you take
precautions to prevent it, like using shielded boxes with all I/O
differential with good common mode rejection. Books have been written
on the subject.

Well, in fact, I will place the box with the breadboard, heatsink and
everything electronic kind of far away from the reactor and HF
circuit. The welder is separated by a wall in the middle, and the
circuit will be beyond the wall. It is needed anyway for proper
cooling.

That said, would not a capacitor and a resistor protect me from
transient spikes? I thought that that's what snubbers are for.

The EMI issue is mostly about your low level oscillator and gate drive
circuits which must be protected by design and layout, not snubbers.

I see. The gate driver would isolate them from load electrically, to
some extent. Are you concerned about EM waves inducing currents in my
circuitry, or about interference arriving through power cables?

If it is the former, I will place this item in a separate compartment
of the welder as opposed to where the HF unit is. If it is the latter,
I will try to make sure that there is sufficient isolation.

Quote:
You could in theory protect your IGBTs with snubbers, but when you do
the calculation on how big they need to be to handle your reactor
energy you will appreciate the approach of never letting both sides of
your bridge turn off at the same time in order to avoid the need to
snub that much energy.

Sure. I mean, I would not mind installing a large capacitor, but that
could worsen starting conditions. I will indeed try to select gate
resistors so that there is a little bit of cross conduction.


Quote:
This approach completely screws desaturation protection however
because if the desat circuit turns off your IGBTs they will see the
full reactor energy. Have you measured your reactor inductance yet?
That is the first thing you need to know in order to design a
workable snubber, otherwise you may just add an exploding snubber
cap to your exploding IGBT!

I have not yet, have not had time, but I do want to do that indeed.

Quote:
Mostly snubbers are used to protect from the energy stored in
relatively small wiring inductances, not big-ass reactors. If you
simply copy someones wiring inductance snubbers you will be needing
those safety glasses and face shield the first time your bridge turns
off at high current, either due to design error or when EMI kills your
control circuit!

I agree 100%. I think that there is a calculation of snubber size
based on inductance, in the Fuji manual.

I started drawing schematic of my circuit, and will calculate all
needed things in Gnumeric (equivalent of excel). All resistances,
capacitances etc.

i
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Rich Grise
electronics forum Guru


Joined: 24 Mar 2005
Posts: 3971

PostPosted: Thu Oct 13, 2005 5:40 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On Thu, 13 Oct 2005 14:22:12 +0000, Robert Latest wrote:

Quote:
["Followup-To:" header set to sci.electronics.design.]
On 13 Oct 2005 02:02:05 -0700,
Winfield Hill <Winfield_member@newsguy.com> wrote
in Msg. <dil7qd01tfv@drn.newsguy.com

Listen up my ignorant sonny, your enthusiasm is noted,

yes, but isn't that some enthusiasm? Maybe I'm a poor judge because I
always lean to the pessimistic side, but I've never seen anything as
doomed as this TIG welder project. In the end, Ignoramus will be out 50
bucks for his IGBTs and a few dollars for his gate drive circuitry, but
that'll be a small price for the knowledge gained.

So... power to him!

Yeah - has anyone noticed little 'i's other thread that he just started,
"Demolishing electronic equipment"?

I think he's well on his way to demolishing some IGBTs and possibly
a welder and maybe his house. =:-O

Sigh,
Rich
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Ignoramus25589
electronics forum beginner


Joined: 13 Oct 2005
Posts: 13

PostPosted: Thu Oct 13, 2005 6:09 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On Thu, 13 Oct 2005 17:40:09 GMT, Rich Grise <rich@example.net> wrote:
Quote:
On Thu, 13 Oct 2005 14:22:12 +0000, Robert Latest wrote:

["Followup-To:" header set to sci.electronics.design.]
On 13 Oct 2005 02:02:05 -0700,
Winfield Hill <Winfield_member@newsguy.com> wrote
in Msg. <dil7qd01tfv@drn.newsguy.com

Listen up my ignorant sonny, your enthusiasm is noted,

yes, but isn't that some enthusiasm? Maybe I'm a poor judge because I
always lean to the pessimistic side, but I've never seen anything as
doomed as this TIG welder project. In the end, Ignoramus will be out 50
bucks for his IGBTs and a few dollars for his gate drive circuitry, but
that'll be a small price for the knowledge gained.

So... power to him!

Yeah - has anyone noticed little 'i's other thread that he just started,
"Demolishing electronic equipment"?

I think he's well on his way to demolishing some IGBTs and possibly
a welder and maybe his house. =:-O

I must say here that most things that I tried, actually worked.

Which is not to say that I have a magic hand or some such, but I am
quite willing to listen to sensible suggestions and do it the right
way, within budget, and that normally works out.

I am somewhat optimistic, I give it about 50 percent chance that my
stuff will actually work and not blow up during actual welding.

As I said, I will make this circuit in stages. I will test them on the
bench, without getting the welder involved. I will post details of my
schematic, layout and whatnot in hopes of getting some intelligent
comments, before having a chance of blowing it up.

I may have a chance of doing a little bit this weekend.

If you think that something specific that I am going to do, will not
work, I certainly would appreciate your input. If you think that my
plan is doomed to failure, and have a specific unsolvable issue in
mind, again, I will be happy to listen as it will save me valuable
time.

i
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Glen Walpert
electronics forum Guru Wannabe


Joined: 04 May 2005
Posts: 134

PostPosted: Thu Oct 13, 2005 6:13 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On Thu, 13 Oct 2005 14:58:23 GMT, Ignoramus25589
<ignoramus25589@NOSPAM.25589.invalid> wrote:

Quote:
On Thu, 13 Oct 2005 13:52:22 GMT, Glen Walpert <gwalpert@notaxs.com> wrote:
On Thu, 13 Oct 2005 00:44:21 GMT, Ignoramus24489

The EMI issue is mostly about your low level oscillator and gate drive
circuits which must be protected by design and layout, not snubbers.

I see. The gate driver would isolate them from load electrically, to
some extent. Are you concerned about EM waves inducing currents in my
circuitry, or about interference arriving through power cables?

Yes. Intereference will travel in on all possible paths.

Quote:
I started drawing schematic of my circuit, and will calculate all
needed things in Gnumeric (equivalent of excel). All resistances,
capacitances etc.

Great, show us your calculations when you are done.
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Ignoramus25589
electronics forum beginner


Joined: 13 Oct 2005
Posts: 13

PostPosted: Thu Oct 13, 2005 6:21 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On Thu, 13 Oct 2005 18:13:17 GMT, Glen Walpert <gwalpert@notaxs.com> wrote:
Quote:
On Thu, 13 Oct 2005 14:58:23 GMT, Ignoramus25589
ignoramus25589@NOSPAM.25589.invalid> wrote:

On Thu, 13 Oct 2005 13:52:22 GMT, Glen Walpert <gwalpert@notaxs.com> wrote:
On Thu, 13 Oct 2005 00:44:21 GMT, Ignoramus24489

The EMI issue is mostly about your low level oscillator and gate drive
circuits which must be protected by design and layout, not snubbers.

I see. The gate driver would isolate them from load electrically, to
some extent. Are you concerned about EM waves inducing currents in my
circuitry, or about interference arriving through power cables?

Yes. Intereference will travel in on all possible paths.

Alright. So, there is some degree of what I hope will protect my
circuit against both paths (EM waves traveling in space and by wire)

1) there is electrical isolation of DC power bus voltage from the rest
of the circuit, done by the gate driver.

2) the circuit will be located in the separate compartment from where
HF start circuit and such are located.

Quote:
I started drawing schematic of my circuit, and will calculate all
needed things in Gnumeric (equivalent of excel). All resistances,
capacitances etc.

Great, show us your calculations when you are done.

Yes, I definitely will post a schematic and all calculations (exported
to excel format for compatibility), links to all datasheets, etc etc.

Once I do the layout, I will post that as well.

I will probably use a breadboard first, being mindful to revisit the
layout and use of breadboard before testing my inverter inside the
welder.

Things like this, as far as I am concerned, are not done in one stage
and are not plugged to do the work right after assembly.

i
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Glen Walpert
electronics forum Guru Wannabe


Joined: 04 May 2005
Posts: 134

PostPosted: Thu Oct 13, 2005 6:35 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

Terry Given <my_name@ieee.org> wrote:
Quote:
Glen Walpert wrote:
ignoramus24489@NOSPAM.24489.invalid> wrote:

That said... How do you get to plot rare events such as my switchings,
on the oscilloscope, so that I see voltage spikes.

carefully. usually with a DSO, so you can catch the damned transient
event that snots your IGBTs. I once spent 3hrs in the lab, blanket
draped over me & the PM3394 scope in analogue mode, brightness cranked
up, to catch a glimpse of something I suspected was there, but couldnt
make the digital scope trigger on. I eventually saw one glitch, me & a
buddy then reasoned out the cause in about 3 minutes flat, and had a fix
running about 1/2 an hour later. metastability causing a race condition
causing runt pulse causing very intermittent self-destruct. yay for ISP
CPLDs.

Trigger on the gate drive for instance.

Also, would high voltage not endanger the oscilloscope itself?

Perhaps, stay within its ratings using a voltage divider if necessary.


then, when it gets destroyed, replace the scope and get a few P5200 diff
probes.

Good idea. I expect he can get away without them while testing with
his low power supply if he is careful, but at full power the same
transients that will destroy his IGBTs could easily fry his scope at
the same time. While he is looking for diff probes on eBay he might
want to keep an eye out for suitable current transformers as an
alternative to measuring currents with a shunt and a diff probe.

Quote:
and wear safety glasses and a face shield at all times his equipment
is energized. Buying a few dozen spare IGBTs and gate drivers would
be a good idea too.

haha

Not joking, I have seen large plastic packages explode with the noise
of a shotgun blast and similar dispersal of small bits. How much do
you value your eyesight?

1,000J will destroy many plastic packages. A Semikron rep once proudly
announced their "rupture-proof" 1/2-bridge modules. So we bolted some to
our 100kW prototype, and blew them up. The first one didnt rupture, but
the drive leaped about 1' into the air. So we replaced the IGBT, and sat
an anvil on top of a sheet of nomex on top of the unit, and the module
blew itself to tiny pieces. He was suitably embarassed, but bought us
lunch so that was OK. IIRC it was only a kJ or so....

Well at least he should be well under a kJ. Although I previously
guessed that his inductor was on the order of 10 uH, that was a typo,
I meant 10 mH. I see that Hobart uses the classic 6 phase double-Y
connection with interphase transformer, so the SCRs fire 6 times per
cycle or every 2.8 ms, and if the inductor is sized to allow current
decay of 5 amps at 20 volts in 2.5 msec then the inductor would be 20
volts / 2000 volt/sec = 10 mH. They might easily have designed for
less ripple but probably not less than 1 amp, for a 50 mH reactor. So
with a short circuit current of say 400 amps he only has 20 joules to
dump somewhere unless I screwed up again Smile.
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Winfield Hill
electronics forum Guru


Joined: 05 May 2005
Posts: 1996

PostPosted: Thu Oct 13, 2005 6:47 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

Glen Walpert wrote...
Quote:

Well at least he should be well under a kJ. Although I previously
guessed that his inductor was on the order of 10 uH, that was a typo,
I meant 10 mH. I see that Hobart uses the classic 6 phase double-Y
connection with interphase transformer, so the SCRs fire 6 times per
cycle or every 2.8 ms, and if the inductor is sized to allow current
decay of 5 amps at 20 volts in 2.5 msec then the inductor would be 20
volts / 2000 volt/sec = 10 mH. They might easily have designed for
less ripple but probably not less than 1 amp, for a 50 mH reactor.
So with a short circuit current of say 400 amps he only has 20 joules
to dump somewhere unless I screwed up again Smile.

20J? E = 0.5 LI^2 = 0.5 0.01 400A^2 = 800J. With 50mH, 4000J.


--
Thanks,
- Win
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Rich Grise
electronics forum Guru


Joined: 24 Mar 2005
Posts: 3971

PostPosted: Thu Oct 13, 2005 8:11 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On Thu, 13 Oct 2005 18:21:58 +0000, Ignoramus25589 wrote:

Quote:
Yes, I definitely will post a schematic and all calculations (exported
to excel format for compatibility), links to all datasheets, etc etc.

Excel? "Compatibility"??????

Good Luck!
Rich
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Ignoramus13229
electronics forum beginner


Joined: 13 Oct 2005
Posts: 5

PostPosted: Thu Oct 13, 2005 8:25 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On 2005-10-13, Rich Grise <rich@example.net> wrote:
Quote:
On Thu, 13 Oct 2005 18:21:58 +0000, Ignoramus25589 wrote:

Yes, I definitely will post a schematic and all calculations (exported
to excel format for compatibility), links to all datasheets, etc etc.

Excel? "Compatibility"??????

Well, tell me the format that you want... Like I said, I will actually
be using Gnumeric under linux.

i
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Rich Grise
electronics forum Guru


Joined: 24 Mar 2005
Posts: 3971

PostPosted: Thu Oct 13, 2005 8:28 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On Thu, 13 Oct 2005 18:09:32 +0000, Ignoramus25589 wrote:

Quote:
On Thu, 13 Oct 2005 17:40:09 GMT, Rich Grise <rich@example.net> wrote:
On Thu, 13 Oct 2005 14:22:12 +0000, Robert Latest wrote:

["Followup-To:" header set to sci.electronics.design.]
On 13 Oct 2005 02:02:05 -0700,
Winfield Hill <Winfield_member@newsguy.com> wrote
in Msg. <dil7qd01tfv@drn.newsguy.com

Listen up my ignorant sonny, your enthusiasm is noted,

yes, but isn't that some enthusiasm? Maybe I'm a poor judge because I
always lean to the pessimistic side, but I've never seen anything as
doomed as this TIG welder project. In the end, Ignoramus will be out 50
bucks for his IGBTs and a few dollars for his gate drive circuitry, but
that'll be a small price for the knowledge gained.

So... power to him!

Yeah - has anyone noticed little 'i's other thread that he just started,
"Demolishing electronic equipment"?

I think he's well on his way to demolishing some IGBTs and possibly
a welder and maybe his house. =:-O

I must say here that most things that I tried, actually worked.

Which is not to say that I have a magic hand or some such, but I am
quite willing to listen to sensible suggestions and do it the right
way, within budget, and that normally works out.

I am somewhat optimistic, I give it about 50 percent chance that my
stuff will actually work and not blow up during actual welding.

As I said, I will make this circuit in stages. I will test them on the
bench, without getting the welder involved. I will post details of my
schematic, layout and whatnot in hopes of getting some intelligent
comments, before having a chance of blowing it up.

I may have a chance of doing a little bit this weekend.

If you think that something specific that I am going to do, will not
work, I certainly would appreciate your input. If you think that my
plan is doomed to failure, and have a specific unsolvable issue in
mind, again, I will be happy to listen as it will save me valuable
time.

I'm sorry if I sound harsh or condescending here, but if you can take
a DC welder and an H-bridge and get AC to come out of it without
dramatically hacking the welder itself, then more power to you, and
I'd really like to see it. Don't forget - when you're DCEN, your
whole welder and workpiece are positive ground. When you're DCEP,
your whole welder and workpiece are negative ground. So you not
only have to run AC to the electrode, you have to have the whole
welder and workpiece going from negative to positive at your pulse
rate.

If _anybody_ could make that work, I'd love to see it.

But that other thread you've started about "Demolishing electronic
equipment", where it sounds like you don't even know a resistor from
a capacitor, gives me serious qualms about your ability to get this
thing accomplished[1].

I don't mean to rain on your parade[2]; as I've already said in one of
the other three or four threads about this project, it's your welder,
your IGBT's, your money, your eyes, your house, and etc., so, I wish
you all the luck in the world.

The thing is, with a project of this magnitude, I have a feeling that
you're going to need it. (all of the luck in the world, that is.)

Good Luck!
Rich
[1] I'd have been a lot less nervous about this if you'd said something
like "salvaging". But that's just my not-so-humble opinion.
[2] On second thought, I guess that's exactly what I'm trying to do.
I'm sorry for that, and like I say, good luck, and try not to win a
Darwin award.
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John Woodgate
electronics forum Guru


Joined: 24 Mar 2005
Posts: 1546

PostPosted: Thu Oct 13, 2005 8:49 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

I read in sci.electronics.design that Rich Grise <rich@example.net>
wrote (in <pan.2005.10.13.20.15.46.525644@example.net>) about 'Driver
for IGBT? (-ve off and +ve on from CMOS)', on Thu, 13 Oct 2005:
Quote:
On Thu, 13 Oct 2005 18:21:58 +0000, Ignoramus25589 wrote:

Yes, I definitely will post a schematic and all calculations (exported
to excel format for compatibility), links to all datasheets, etc etc.

Excel? "Compatibility"??????

I don't understand how you can do a schematic in Excel anyway.

--
Regards, John Woodgate, OOO - Own Opinions Only.
If everything has been designed, a god designed evolution by natural selection.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
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Ignoramus13229
electronics forum beginner


Joined: 13 Oct 2005
Posts: 5

PostPosted: Thu Oct 13, 2005 8:57 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On 2005-10-13, Rich Grise <rich@example.net> wrote:
Quote:
On Thu, 13 Oct 2005 18:09:32 +0000, Ignoramus25589 wrote:

On Thu, 13 Oct 2005 17:40:09 GMT, Rich Grise <rich@example.net> wrote:
On Thu, 13 Oct 2005 14:22:12 +0000, Robert Latest wrote:

["Followup-To:" header set to sci.electronics.design.]
On 13 Oct 2005 02:02:05 -0700,
Winfield Hill <Winfield_member@newsguy.com> wrote
in Msg. <dil7qd01tfv@drn.newsguy.com

Listen up my ignorant sonny, your enthusiasm is noted,

yes, but isn't that some enthusiasm? Maybe I'm a poor judge because I
always lean to the pessimistic side, but I've never seen anything as
doomed as this TIG welder project. In the end, Ignoramus will be out 50
bucks for his IGBTs and a few dollars for his gate drive circuitry, but
that'll be a small price for the knowledge gained.

So... power to him!

Yeah - has anyone noticed little 'i's other thread that he just started,
"Demolishing electronic equipment"?

I think he's well on his way to demolishing some IGBTs and possibly
a welder and maybe his house. =:-O

I must say here that most things that I tried, actually worked.

Which is not to say that I have a magic hand or some such, but I am
quite willing to listen to sensible suggestions and do it the right
way, within budget, and that normally works out.

I am somewhat optimistic, I give it about 50 percent chance that my
stuff will actually work and not blow up during actual welding.

As I said, I will make this circuit in stages. I will test them on the
bench, without getting the welder involved. I will post details of my
schematic, layout and whatnot in hopes of getting some intelligent
comments, before having a chance of blowing it up.

I may have a chance of doing a little bit this weekend.

If you think that something specific that I am going to do, will not
work, I certainly would appreciate your input. If you think that my
plan is doomed to failure, and have a specific unsolvable issue in
mind, again, I will be happy to listen as it will save me valuable
time.

I'm sorry if I sound harsh or condescending here, but if you can take
a DC welder and an H-bridge and get AC to come out of it without
dramatically hacking the welder itself, then more power to you, and
I'd really like to see it. Don't forget - when you're DCEN, your
whole welder and workpiece are positive ground. When you're DCEP,
your whole welder and workpiece are negative ground.

I will have to check tonight if the welder's "work" terminal is in
fact connected to the frame of the welder (and equipment ground).

A few days ago, I did look inside the welding machine at the
commutator and stuff around it, and did not see any such
connection. Since there is a commutator, the connection of work
terminal to ground would need to be done after the commutator, and
there was not much after the commutator, between it and the work
terminal. But perhaps I missed something obvious.

I will definitely check with an ohmmeter, for a definite answer.

Quote:
So you not only have to run AC to the electrode, you have to have
the whole welder and workpiece going from negative to positive at
your pulse rate.

That would be a bummer.

Quote:
If _anybody_ could make that work, I'd love to see it.

But that other thread you've started about "Demolishing electronic
equipment", where it sounds like you don't even know a resistor from
a capacitor, gives me serious qualms about your ability to get this
thing accomplished[1].

That's a valid question, but, on the other hand, this particular
difficulty can be overcome. I mean, I know how to tell one from
another by using test equipment. :)

Quote:
I don't mean to rain on your parade[2]; as I've already said in one of
the other three or four threads about this project, it's your welder,
your IGBT's, your money, your eyes, your house, and etc., so, I wish
you all the luck in the world.

Thank you.

Quote:
The thing is, with a project of this magnitude, I have a feeling that
you're going to need it. (all of the luck in the world, that is.)

That's for sure. On the other hand, I am not doing it completely
alone, there is plenty of people who already showed their ability to
set me on the straight and narrow.

i

Quote:
Good Luck!
Rich
[1] I'd have been a lot less nervous about this if you'd said something
like "salvaging". But that's just my not-so-humble opinion.
[2] On second thought, I guess that's exactly what I'm trying to do.
I'm sorry for that, and like I say, good luck, and try not to win a
Darwin award.
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Ignoramus13229
electronics forum beginner


Joined: 13 Oct 2005
Posts: 5

PostPosted: Thu Oct 13, 2005 9:07 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On 2005-10-13, John Woodgate <jmw@jmwa.demon.contraspam.yuk> wrote:
Quote:
I read in sci.electronics.design that Rich Grise <rich@example.net
wrote (in <pan.2005.10.13.20.15.46.525644@example.net>) about 'Driver
for IGBT? (-ve off and +ve on from CMOS)', on Thu, 13 Oct 2005:
On Thu, 13 Oct 2005 18:21:58 +0000, Ignoramus25589 wrote:

Yes, I definitely will post a schematic and all calculations (exported
to excel format for compatibility), links to all datasheets, etc etc.

Excel? "Compatibility"??????

I don't understand how you can do a schematic in Excel anyway.

I will do calculations in excel... the schematic I will draw by hand...

i
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Ignoramus13229
electronics forum beginner


Joined: 13 Oct 2005
Posts: 5

PostPosted: Thu Oct 13, 2005 9:07 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On 2005-10-13, John Woodgate <jmw@jmwa.demon.contraspam.yuk> wrote:
Quote:
I read in sci.electronics.design that Rich Grise <rich@example.net
wrote (in <pan.2005.10.13.20.15.46.525644@example.net>) about 'Driver
for IGBT? (-ve off and +ve on from CMOS)', on Thu, 13 Oct 2005:
On Thu, 13 Oct 2005 18:21:58 +0000, Ignoramus25589 wrote:

Yes, I definitely will post a schematic and all calculations (exported
to excel format for compatibility), links to all datasheets, etc etc.

Excel? "Compatibility"??????

I don't understand how you can do a schematic in Excel anyway.

I will do calculations in excel... the schematic I will draw by hand...

i
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Rich Grise
electronics forum Guru


Joined: 24 Mar 2005
Posts: 3971

PostPosted: Thu Oct 13, 2005 9:23 pm    Post subject: Re: Driver for IGBT? (-ve off and +ve on from CMOS) Reply with quote

On Thu, 13 Oct 2005 20:25:01 +0000, Ignoramus13229 wrote:

Quote:
On 2005-10-13, Rich Grise <rich@example.net> wrote:
On Thu, 13 Oct 2005 18:21:58 +0000, Ignoramus25589 wrote:

Yes, I definitely will post a schematic and all calculations (exported
to excel format for compatibility), links to all datasheets, etc etc.

Excel? "Compatibility"??????

Well, tell me the format that you want... Like I said, I will actually
be using Gnumeric under linux.


Oh, do whatever you want - I was just M$-bashing. :-)

Cheers!
Rich
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