Driver circuit for IGBT

[memo-afeef-nasser]

you are right my friend FVM
IRG4PC50U is acting as a free-wheeling diode
but why the IGBT (GT60N321) destroys ?

 

[KlausST]

Hi,

It destroys by
* overcurrent
* overvoltage
* overheat / power dissipation

A scope will show you.
measure the DS voltage .. with the two scope clamps directely at the IGBT pins.
* Focus on the voltage peak when the IGBT switches OFF.
* and focus on the (low) voltage when the IGBT is ON.

Klaus

 

[Easy peasy]

Change R2 to 470 ohm, this will quieten down your switching circuit - make sure Q1 and the other are well heatsunk ...!

 

[memo-afeef-nasser]

I uesed very big heat sinks for IGBT (GT60N321)
and I uesed MUR6060PT as a free-wheeling diode In parallel the dc motor
the circuit worked well , but when I Turned off the circuit
the IGBT (GT60N321) damaged
could you help me why the IGBT damege?

 

[Easy peasy]

how exactly did you power down the circuit...!!?

 

[memo-afeef-nasser]

by turn off the power (VDC MAIN POWER SUPPLY)

 

[memo-afeef-nasser]

I HAVE an idea
I will put a varistor In parallel the motor (10D511K)
to protact the IGBT

 

[KlausST]

Hi,

Why across the motor? ...When you want to protect the IGBT?
Connect it across the IGBT.

Klaus

 

[D.A.(Tony)Stewart]

Have you performed this method yet?

 

[memo-afeef-nasser]

Hi my friend SunnySkyguy
I didnot get the idea very well
Can you explain to me more please?

- - - Updated - - -

Hi my friend Klaus ST
becuase when i turn off the power
the Stored electrical energy in the motor will Discharge across the varistor to the ground

 

[KlausST]

Hi,

Hi my friend Klaus ST
becuase when i turn off the power
the Stored electrical energy in the motor will Discharge across the varistor to the ground

Ok, I see. This is not wrong. You try to avoid overvoltage at the expected source of energy.

On the other hand...
If there are other possible sources of high voltage peaks(stray inductance of wiring, overshot in DC bus) ...you need several protection circuits.
A single) fast overvoltage protection close at the IGBT will protect the IGBT in any case...with any source of overvoltage...

Klaus

 

[memo-afeef-nasser]

Thank you klaus ST
several protection circuits like what?
may be fast diod( MUR6060PT)

 

[KlausST]

Hi,

If you don't want to connect an overvoltage protection circuit across the IGBT...then you need to add a protection device across each possible source of high voktage.
* Motor us simple.
* power supply is simple
* wiring stray inductance is difficult or impossible
* any other source?
And you need to consider that all the added (worst case) voltages need to be lower than the IGBT specification.

Klaus

 

[memo-afeef-nasser]

Is Snubber circuit( in parallel the Igbt )possible to be protection to Igbt?

 

[KlausST]

Hi,

I don't know. What voltage do you expect?
If the voltage is less than the specified limit, then the protection should work.

Klaus

 

[memo-afeef-nasser]

Hi
Idont know what is happen
but the Igbt (GT60N321) damaged (destroyed)
please give my a Solution to protect the Igbt

 

[KlausST]

Hi,

Post a photo of your circuit. It needs to show:
* power supply
* wiring
* controller board
* IGBT
* motor
* protection circuit

Klaus