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Old 27th July 2009, 03:03 AM   #1
Orcino is offline Orcino  Brazil
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Default IGBTs exploding

Hi everbody.
In the sch attached in tests with variac with 110 vac works great, but in 230vac , i gradually increased the load, then in + or - 1.4 Kw the IGBTs explode.
Does anyone have any idea of what is happening ?

Thanks

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Old 27th July 2009, 03:56 AM   #2
star882 is offline star882  United States
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Unlike MOSFETs, IGBTs cannot be paralleled unless they're very well matched. Split the PFC stage into 2 phases and run then 180 degrees out of phase.

You probably also need a capacitor in series with the transformers to prevent core saturation or modify it for current mode operation.
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Old 27th July 2009, 08:33 AM   #3
Eva is offline Eva  Spain
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Which IGBTs explode? Is the current limiting of the PFC working properly?

IRGP4064 *can* be paralleled, it's designed for that.
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Old 27th July 2009, 12:39 PM   #4
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You haven't shown PFC controller. What type is that? Note that PFC current sense is negative related to primary ground.
Also, what's the purpose of implementing current mode control with a controller?
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Old 27th July 2009, 12:47 PM   #5
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Holy cr@p!
I've just noticed you try to make a poly-phase rectification of all 3 phases and then try to make a PFC with a single boost regulator
How do you imagine to correct the power factor of all 3 phases together if they are diode-ORed or commonly multi rectified (don't know the exact name for this technique) ??
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Old 27th July 2009, 01:51 PM   #6
Orcino is offline Orcino  Brazil
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Hi, Not yet assembled the PFC, only the part of the full bridge and feed back de current.

The IGBTs exploding are the bridge, someone sees something wrong in the circuit f ?
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Old 27th July 2009, 02:06 PM   #7
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With this type of output filter you will experience high peaks in primary current, probably not reflected into secondary DC current sense. So the current sense is useless here.
Correct it into proper LC filter.
We still cannot see the control algorithm, as it is implemeted in DSP.
And maybe even more vital: why don't you sense the primary current?
Sensing secondary current the way you did it is asking for problems IMO, I do not really see how a proper current ramp could be created this way...
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Old 27th July 2009, 02:12 PM   #8
luka is offline luka  Slovenia
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WTF? am I wrong here, or I see that he has 3 phases and trying to rectify them with 2 single phase rectifiers?
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Old 27th July 2009, 02:16 PM   #9
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Quote:
WTF? am I wrong here, or I see that he has 3 phases and trying to rectify them with 2 single phase rectifiers?
That actually creates a 'proper' 3 phase rectifier, but I don't see how this could be PFCable
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Old 27th July 2009, 02:23 PM   #10
luka is offline luka  Slovenia
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nor do I, and PF in 3 -phase should be pretty good to start with, I mean no need for one in few kw range

What I would do, is make 3 PFCs, each for its own phase
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