Thnkz Electrino N S,
Thnkz FvM,
i wish to use ir2110 driver ic or ir23364(d)
ir2110 ic can deliver 2A current..(Io+,Io- = 2A ,From datasheet).
http://www.irf.com/product-info/datasheets/data/ir2110.pdf
but it drive nly for half bridge.
for my applicationn
i wana to drive 3 phase inverter (IGBT FG25N120ANTD)
Ir23364(D) driver ic can drive 3 phase bridge.
**broken link removed**
but itz Io+ =200ma,Io- =350ma.
can i use ir23364(d) driver ic by increasing Rg
Rg = 15/.2 = 75 ohm.
dVs/dt = 50V/ns (Allowable VS offset supply transient relative to VSS , from datasheet). it will depend on rg.
dead time = 275ns (ir23364 ,datasheet)
is this dead time is enough for my application ??
or shall i add external dead time ??
can i use fast optocoupler ic 6N137 ???
Tlph = 45ns..
http://www.fairchildsemi.com/datasheets/HC/HCPL2631.pdf
SPWM Freq is 33khz .
Pls share your knowledges....
regards
mobin
you asked wether 275ns is enough dead time , the answer is that you should know from the calculation i gave u :
i=dQ/dt , we know that i=0.2A , and q= 200nC so t=200nC/0.2A=1us so , your IGBT needs 1us to turn on and 1us to turn off , so when u order the igbt to turn off it will take 1000ns but after 275ns of deadtime the other transistor in the half bridge will be ordered to turn ON , SO SHORT THROUGH WILL HAPPEN !!! THIS DEADTIME is NOT enough !!!!
use 3 IR2110 , to create a 3 phase bridge ,stop limiting your options because of this IC (ir23364)
if you are lazy and want a three phase driver : check out HIP4086 or A4915
regards
Thnkz Electro NS,
i found an App note for Calculating dead time in IGBT module by infineon
https://www.infineon.com/dgdl/Infin...n.pdf?fileId=db3a30431a5c32f2011a5daefc41005b
In this APP note
an eqn for calculating dead time
should i use this eqn ??
regards
mobin
yes offcourse it might work i makes a lot of sense , but the terms turn off donot take into account the drive current (he mension something about external gate resistor) so the writer presumes results from oscilloscope measurements maybe ?? , i want you to do this calculation and compare it to the calculation i gave u then we can discuss , if the results are not close , right ??
good luck
Thnkz electrino N S
I did calculation ,pls check
Td(on) = 50ns & Td(off) = 190ns (at 25deg c, Rg = 10ohm, Ic =25A ..Values from datasheet.)
i noted that the chara of switching time(Td(on) & Td(off) ) Depend on external gate resistance and collector current.
in my application collector current is below 5Amp. and Rg = 27ohm(calculate by Electrino in previous post).
also Tr,Tf is not considerd.Tr= 60ns,Tf=100ns.
as per Eqn
the first term Tdoff - Tdon = 140ns.
second term is the parameter delay match in IR2110 driver datasheet = 10ns
so total = 150ns * 1.2 = 180ns.
also i attached the switching chara.
from graph, When Rg = 27 ohm( 25-30),Ic = 25A approximate value of Tdon = 65ns,Toff =275ns
Tdoff - Tdon = 210ns
delay mismatch is 10ns
so dead time is 220*1.2 =264ns
is this calculation is right??
Tonpdd = 160ns, Toff pdd = 150ns (ir2110 datasheet)
should i consider the propgation delay of optocoupler ic 6n137, which isolate cntrl ckt from driver ic ??
regards
mobin
Basically yes. You should add it's maximum delay skew to the dead time to be on the save side.should i consider the propgation delay of optocoupler ic 6n137, which isolate cntrl ckt from driver ic ??
2 ways to connect..
pin2 is connected to 5v,
pin3 is connected to output of AND gate(cntrler ckt)through series resistor.
or
Pin 2 is connected to out of and gate and
pin3 is connected to grnd through series resistor.
no, still 20 µAnput bias current is 15/1k = 15ma ..
nois it destroy ir2110 ic ??
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