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4hv.org :: Forums :: General Science and Electronics
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Bidirectional IGBT AC switch?

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Kolas
Fri Oct 21 2016, 05:18AM
Kolas Registered Member #102 Joined: Thu Feb 09 2006, 08:15PM
Location: Raleigh, NC
Posts: 169
Hey there guys. Here's a little idea I've been cooking up.
Two Series-Opposing IGBT's with parallel diodes. I've found some information regarding the use of this circuit for control of alternating current loads. But I am unsure. This circuit looks like it could be a drop in replacement for the use of triacs. Additionally, some other options appear to be available for output modulation. Switching would be done symmetrically on a half wave basis to avoid DC current within the transformer primary. Square wave signals will be supplied by a micro controller.
There are two options with this specific topology: connected emitters, and connected collectors.

My questions are as follows.
1. Will this circuit work to provide control of alternating current to a highly inductive load?
2. Is it more advisable to use connected emitters or connected collectors. If connected emitters can be used, should the gates be driven together or inversely?
3. Are snubber circuits necessary for proper operation?

Included is a quick drawing of what is implied. Sorry for it's crudeness.
I am considering this situation in order to avoid buying somewhat pricey triacs. The IGBT's referenced are ones already owned.
The goal is to provide a high degree of control (3-97%) over a fairly large welding transformer. (upcoming!) around 75A at 240v.

Thanks to everyone who took the time to read and possibly reply!
Kolas
1477027050 102 FT0 Bidriectional Ac Switch Igbt
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DerAlbi
Fri Oct 21 2016, 01:18PM
DerAlbi Registered Member #2906 Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727
1. Will this circuit work to provide control of alternating current to a highly inductive load?
I am sorry to say this, but this circuit will die immeadiately if you turn it on.
An inductive load tries to have a constant current, so the current keeps flowing even if the IGBTs are in the off-state. Thus inducing an overvoltage which will destroy the switches.

The way i see it you want to build a stepdown converter with fixed dutycycle so read about stepdown coverters and build it for one polarity, then think about how to incorporate the other halfwave. Just one step at a time after you actually understand what you are doing smile


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Sulaiman
Fri Oct 21 2016, 03:40PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I suggest that ease of dying from transients in high power circuits goes
thyristor, triac, bjt, igbt, mosfet.
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Kizmo
Thu Oct 27 2016, 08:03AM
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
This is how i would do it :)

Vkr0G3P
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Kolas
Fri Oct 28 2016, 10:53PM
Kolas Registered Member #102 Joined: Thu Feb 09 2006, 08:15PM
Location: Raleigh, NC
Posts: 169
Hehe that's actually a pretty nifty idea. Thanks for the feedback guys.
Kolas
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anokata
Sat Dec 03 2016, 06:36PM
anokata Registered Member #1081 Joined: Sun Oct 28 2007, 08:04PM
Location: Minsk Belarus
Posts: 12
Hi. May be useful to you. IGBT transistor in this circuit also work fine.
1480790165 1081 FT178044 Edn Mosfet Dimmer
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