| Electronics > Projects, Designs, and Technical Stuff |
| Shoot-through 3 phase bridge? gate drive waveform |
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| 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 |
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