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How to control 4 lamps of 1200w each with PWM

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ljmprey

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Hi. I'm having a problem with an aplicaction. I want to control four lamps of high power (1200 watts). Actually i'm using a national instruments fieldpoint and a PWM module. In the power electronics i'm using IGBTS (IRGPH40F1). Each Lamp is connected to an igbt and a pwm channel. It seems to work fine for one and two lamps, but when i connect a third lamp all the igbts get damaged. I need to control four lamps simultaneusly. Does anybody have an idea why can't i connect more than two lamps simultaneously?. Attached is the circuit i'm using.

Thank you.
 

Reason is most likely your "control light dimmer" circuit.
Here is soultion:
92_1220390609.jpg
 
Hi Sinisa, the control ligth dimmer circuit really doesn't exist i have the pwm's output directly to the igbt's gate. Can't see the solution you gave me. can you put the image again please?
 

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