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Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
i found something interesting in Texes instruments. 150MBps Opposite Driver. I believe it's very good for large DRSSTC signal isolation. what do you think ??
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Hate to say this but, Its only good for digital or 5v signals, 7v absolute maximum. Although if your purposing that this might be good for the interruptor isolation, it might be, but theres still the issue of noise from the EMi produced and that is picked up by the length of wire between the interruptor and the driver electronics.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Ken M. wrote ...
Hate to say this but, Its only good for digital or 5v signals, 7v absolute maximum. Although if your purposing that this might be good for the interruptor isolation, it might be, but theres still the issue of noise from the EMi produced and that is picked up by the length of wire between the interruptor and the driver electronics.
yep, i will use as digital signal isolator, because all electronics using 5V, so it's ok to me. I have biggest problem, how from 5V signal make IGBT driver signal ? of course is simple for some one, but not for me, because I have for driver's +-15V power supply... and what about noise?!?, can it make a mistake in driving IGBT ? For interrupter will be fiberoptic transmitter-receiver
Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
>I have biggest problem, how from 5V signal make IGBT driver signal ? Heh, if *this* is the biggest problem for you, it sounds like you actually have no problems at all with this coil ;) (after I saw your previous projects, I guess it's true). If you are using an integrated driver IC, just do nothing - they accept 5v control voltage so you should just rig the coupler to the driver directly and it will work. If you are using discreete drivers which require higher input voltage, then it's not a big trouble as well - you can add just a single bipolar transistor to it's output along with a pull-up resistor, so whenever your coupler opens that switch it sinks the input voltage so the driver outputs low; when the coupler closes the switch, the current through the resistor gives Vcc to the driver's input terminal.
Noise will most likely kill IGBTs, but that's not for you to care as 50kv/us CMR is 10 times above the safe value (most switches are rated to be capable of maximum dv/dt of only 5kv/us). Therefore just having small-scale properly wired drivers and coax connections between the coupler and the generator circuit will exclude any noise (however as far as this one is not an optical coupler so is voltage-driven, not current-driven, I'd advice to add a dummy resistive load to the input pins just to make sure there will be no ringing).
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DRSSTC driver signal isolation
