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Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
so like this?
all i did was use the dip 8 format of the 614's. but other than that is this driver fully functional for my HGTG30N60B3D's with a few insignificant changes to the bridge? the driver as it is should have no problem accepting any optical signals as long as they fall within the current ratings of my bridge...
i like constructive critisism believe it or not, so please tell me if i am lacking something!
Registered Member #3964
Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
hey ben, one thing I noticed when comparing your circuit from s.ward's is that, Steve's using a 5v logic circuit which is 5x faster that the 15v series 40XX., this means that with 15v logic IC, your coil must be larger with at most 300khz fres.
Also, Do not get confused when using 2 non-inverting driver w/enable compared to the s.ward's UCC. I second demotion to teravolt when using the ENABLE as this would put the output of the driver in high impedance. is your 614 are IXDD614? or IXDN614? with the "d" driver, it has an enable pin, with the "N" it has nothing. the schematic posted first by tera is correct but must have paralleled diode.
the resistor with the back pointed diode will be effective for the dead time application in your circuit.
There are two schematics posted by teravolt, one without the OCD(over current detector) and one below is with OCD and paralleled diode.
Also, the 12 v and 15 v thing in your driver, first your driver ic (614) must have regulated DC supply up to 35v, but I would recommend placing it 15v, then to make your Gate drive voltage in 30v magnitude(to fully turn on igbt), your GDT must have 1:2 ratio.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
zzz_julian_zzz the muast of the ixdd614 drivers have a 2/3vcc treshold on the input. I usaly like to set vcc to 20v and drive them with 15v. Admiditly HC is much faster than 4000 series but most cmos will run up to 10MHz. Most gate drives shouldn't excied +-20v. I have not tried it with CMOS before, I usaly use HC with a levle shifter to drive the 614 but if it will work with CMOS why not. he would have to breadboard it to check my circuit. hear is the page from clare please look up the ixd?614.
the ci package is the one you want. I am not shure what is most availible dd,dn,di you will have to serch digikey for that.
Registered Member #3964
Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
For IGBT, the 30v I am pertaining is the peak-peak value, so it is actually +-15. My circuit also utilize a level shifter, by using MOSFET for inverting, it will make the output into a rail-to-rail logic level then feed it to a P/N MOSFET switch.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
hey ben, one thing I noticed when comparing your circuit from s.ward's is that, Steve's using a 5v logic circuit which is 5x faster that the 15v series 40XX., this means that with 15v logic IC, your coil must be larger with at most 300khz fres.
yea, if you have been following, you can see that i plan on using a different driver now. probably a modded drsstc.5 or maybe the universal. both would use a 5v circuit with 74HCx chips.
Also, Do not get confused when using 2 non-inverting driver w/enable compared to the s.ward's UCC. I second demotion to teravolt when using the ENABLE as this would put the output of the driver in high impedance. is your 614 are IXDD614? or IXDN614? with the "d" driver, it has an enable pin, with the "N" it has nothing. the schematic posted first by tera is correct but must have paralleled diode.
sorry, having a little trouble following... do you mean to set the inputs high and drive the enables with one inverting and one non-inverting drive signal?(see most recent schematic) and i plan on using two ixdd614s in the ci package. for schematic purposes however, they are pin for pin compatible with ucc's in the dip package.
and lastly, read through the discussion, because most of what you bring up has already been addressed, and the drivers you mentioned have been ruled out. the recent ones are the ones being talked about: teravolt's and steves .5
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