RE: Streamer V/I evolution

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Steve Conner <steve@xxxxxxxxxxxx>



> The lower rail voltage seems very stable but the top rail sure seems 
> to dip a lot.  Not sure if something is wrong there or not.

It was a problem with the bypass caps on my DC bus. They had a 
parallel resonance near twice the operating frequency. I tried 
various different caps till I got rid of it, but haven't taken any 
results with the new caps.


> I am not sure what the scale of the  integral(V x I)dt curve 
> is?  But that and BPS should give you a real power number for the 
> power input to the coil.

It's already in joules (read off on the right hand scale)


>   the voltage spikes might be the actual streamer current pulses to 
> the ground.

I think they're more likely just trash on the DC bus. The amount of 
trash generated depends on how accurate the zero current switching 
is, and the PLL has an error proportional to the rate of change of 
frequency. So yes, the streamer is probably coming out about then, 
and that pulls the resonant frequency down, and the spikes get bigger 
till the PLL catches up.


Steve