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Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Small update: Prediktor pcb ( just in case, better use driver on pcb with mask) And little bit more advanced driver for IGBT with saturation detection and fast optocouplers to synchronize protection :)
Now is the big question: What should i do with desaturation error signal ? disable interrupter for 1s or maybe wait time larger than half of period, and if i still getting error close all IGBT for some time like 1s ( forced close ) ? What should i do ?
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
And here is idea, how to stop bridge. But now question is for how long, or maybe stop and use reset button to continue ? And same driver on new pcb ( i don't like idea that driver is on pcb without solder mask )
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
can some one help me out. Predictor just don't work for me. i can't get even into oscillation, i get just interrupter signal in output ( testing around 100-150V into the bridge) if i connect generator and disconnect shunt resistors i am getting signal out of my UCC's, and if i connect old driver ( just 74HC14 and 74HC109N) i am getting into resonance with no problem. I have basically same circuit as Finn , just using 0,7uF MMC and +-12V for AD790 (not +-15v) Bridge also the same, (full bridge of CM600) And now even if i use some ultra-fast IGBt and simple LC circuit like Finn did in test, i can't get no oscillation any idea why it's happening ? ( That would help a lot )
Registered Member #2922
Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
You need to give us more information.. your inductor, shunt resistance... if you are using a capacitor in series with the input of the AD790, like a 100n capacitor it can be your problem. the capacitor can get charged at the and of the first burst and current will no flow in it at the next bursts, so you lost feedback and no get the start. try put a resistor in paralel with the capacitor, like 10k
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Large DRSSTC [update]
