"Ignoramus28489" wrote in message
...
http://igor.chudov.com/projects/Home...o-AC-Inverter/

Here you see my first working prototype of the IGBT based TIG

snip--Somehow I came across an IR2183(4) half bridge driver. Did you mention
that chip in one of your posts, or consider same? Jim

Ignoramus1487 wrote...

Jim L. wrote:

Somehow I came across an IR2183(4) half bridge driver. Did you
mention that chip in one of your posts, or consider same?

I did indeed mention it. In fact I got two IR22141SS chips for
free as samples from IRF. But I did not use them.

I ended up using Semikron 23 boards, two boards, one for every
half bridge. They are quite straightforward to use and feel
sturdier and with more features.

One of my objections to the IR chips, if I have one, is their
rather slow delay times, e.g. about 200ns for the IR2183, IR2184
and 440ns for the IR22141, etc. And their rather long deadtime,
e.g. 400ns min for the programmable IR21834 driver. While such
long delay times may not affect your IGBT application, I've found
considerable benefit from having more flexibility and being able to
tightly control the driver's deadtime, even down to the 50ns level.
Furthermore, it's valuable to have tight control over the deadtime
as a function of load current, as offered by some TI Unitrode chips.

I've forgotten, how do Semikron 23 boards stack up in this regard?


--
Thanks,
- Win

Ignoramus22022 wrote...

1. No interlock (bridged certain pair of contacts). I could use
turn-on and turn-off resistors for every gate. The more resistance,
the slower is the turn on or turn off. Turn on and turn off start
occurring simultaneously.

Don't forget diodes in series with gate resistors to separately
control on and off delays. Like this popular scheme for rapid
turnoff, to get "break before make."

.. ---+----/\/\-----+--- gate
.. | |
.. '--||--/\/\--'


--
Thanks,
- Win