Re: [TCML] The Hammertone Predikter

[piranha <piranha@xxxxxxxxxx>]

Very nice Finn!

I had two questions.

1.  What gate voltage are you guys running these days?  I think the 
Powerex bricks are "rated" at 15V but I was just wondering if you still 
over drive and by how much.

2.  You say there are no gate resistors.  Is there a story behind that?  
I would worry about the high dI/dT damaging the gates due to very high 
gate currents (max Ig) during switching.  But maybe the gate driver is 
not enough to hurt the big CM600s.  Of course, switching noise is not a 
problem with good zero crossing and then snubbers have no use.

Terry



Finn Hammer wrote:
> All,
>
> In the video that I link to, I show the current ringup in a DRSSTC 
> tesla coil tank circuit. The motor of the DRSSTC is a CM600HA24 brick 
> based H-Bridge.
> The gates are driven by dedicated drivers, and the timing signals are 
> transmitted by optocouplers.
> The big bricks, and the optocouplers add 1.2uS of delay from switching 
> command issued to switching acheived, yet it will be demonstrated that 
> it is possible to produce a voltage waveform free from overshoot and 
> ringing, even under these adverse conditions.
>
> Enjoy!
> http://www.youtube.com/watch?v=CWIxVoKv-dw
>
> Cheers, Finn Hammer
>
>
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