Igbt drive help with vla500 series

Thread Starter

466576266

Joined Mar 17, 2010
10
HELLO, anyone. i meet with a problem recently. its about the igbt driving problem.
as u can see from the pic, the device component selection say, the function of the R2 and R5 is :fault signal noise suppression resistor. and what i wonder is what is the really function of these two resistors, i mean, how does this resistor function as noise suppression? can someone analysis this principle for me ?thank u in advance.
 

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shortbus

Joined Sep 30, 2009
7,774
They look like they form a voltage/potential divider, along with R1 and R4, to supply the correct voltage to the opto-coupler.
 
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