Electronics > Projects, Designs, and Technical Stuff
Shoot-through 3 phase bridge? gate drive waveform
(1/6) > >>
ghoetic:
I have designed a 3 phase motor driver, which currently when trying to start with no load, trips for overcurrent. waveform for topside IGBT's seem wierd.

gatedriver: IRS2334 with local bypass 10uF electrolytic, 1 uF & 0.1 uF MLCC @ 15V
bootstrap capacitance 2.2uF.
integrated deadtime 420ns.
gate resistance: 20ohm
IGBT:STGP10M65DF2
Qg: ~28nC according to datasheet


low side gate waveforms.
rise: https://ibb.co/6nxb6XD
fall: https://ibb.co/NsHWTbw

topside gate waveforms.
rise: https://ibb.co/WDGPKrm
fall: https://ibb.co/k3GC7PJ

assembled board: https://i.ibb.co/3BF29CG/20200601-135204.jpg

i have swapped one of the bridges low and high side input signal to driver, i will fix that in firmware. but it should not be an issue right? its just inverted pulse train.

any ideas for the waveform?

Any ideas?
ghoetic:
Still same issue, when i increased the current trip point i could just about see faint smoke coming from the irs2334 before it tripped again.
Yansi:
The linked images are broken or inaccessible.

Always upload to the forum directly, if possible.
Jay_Diddy_B:
Hi,
can you show the schematic of the IGBTs and the IRS2334 in pdf format?

What are the part number of the boostrap diodes D3 -D5?

Jay_Diddy_B

(Use this feature of the forum to store the images on the forum:

ghoetic:
low side rise
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod