Re: [TCML] The Hammertone Predikter

[piranha <piranha@xxxxxxxxxx>]

Hi Finn,

I have a question.

As you move the crossover timing from too late to too soon, do you 
notice that the bridge tends to "lock on" to the correct timing?

When the timing is late, you will have your inductive voltage spikes and 
all from opening the bridge while current is flowing.  You should be 
able to easily adjust the timing when it is late.

When you reach the perfect timing everything will look fine.

But where it should seem a little odd is if you try to switch the bridge 
too early.  It actually should try not to let you.  As you move the 
timing too early, the IGBTs will almost ignore the timing signal and 
stay on until the current naturally goes to zero.  The IGBT's miller 
capacitance should try to hold it on.  Do you notice that?

You could actually stop the coil's oscillation right there.  The other 
IGBT can turn on anytime it wants after that without current spikes or 
problems.

So it should be that if the crossover timing is a little too early, the 
thing seems to work very well.

I would be interested if you have noticed anything like this.

Best Regards,

   Terry

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