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Registered Member #4762
Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
zzz_julian_zzz,
I'd like to give you advice on that, but I'm using an Attiny13 for a modulator, exactly to avoid insane logics ramp generator and I highly recommend you to do the same.
Registered Member #3964
Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
In a qcw IGBT buck(bus mod) driver circuit, why do we use opto couplers, instead of the conventional GDT like in the case of UD?? its also isolated i think..
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Great work my friend, amazing output.
May I ask what parts you used in the inverter and how you cooled them? Everyone seems to have a different view on how they should be build, i'm curios to see how you did it.
zzz_julian_zzz wrote ...
In a qcw IGBT buck(bus mod) driver circuit, why do we use opto couplers, instead of the conventional GDT like in the case of UD?? its also isolated i think..
Because GDTs have a limited range of duty cycle they can run, if you start to run over or under 50% you will start to level shift the output. Also once you get close to 100% or 0% the core will saturate.
In a modulator you need a wide duty cycle range to operate properly.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
You can also full wave rectify the output of a GDT, but you need to use a simple pulse shaping circuit in front of the gate. This way you can transfer duty cycles from 0 to 100%.
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
Great work! Always fun to see coils that give impressive results like these. Any chance you'll have a video once you fix the blown transistors in the buck?
Registered Member #4762
Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
Thanks for the comments.
The buck was updated to double 50B60 and, heheh, still uses a single HFA30 diode (30A rated, 300A actual current )
The coil was modified to a taller case to fit the schematics and the lytics. It is still junky, but less junky now. All power parts - the boost, the buck, the inductor and the bridge - are clearly visible on the photos. No cooling issues at all: the buck is <40 deg. C, the bridge is cold as ice, the boost is ~50-55 deg. C. The MMC is ~12.5 nf.
Now I only need to place the driver and the power supply inside, and to add a precharge circuit for the 24000uf so that the boost won't explode trying to charge them at the very beginning.
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Junky QCW
and I highly recommend you to do the same.
