using a common mode choke (CMC)) of 2x 100uF you can create a very clean positive voltage impulse, without further (negative voltage) ringing
HC, is the connection to ground via a low inductance coil (10uH for example with a parallel capacitor to tune it)
a MOSFET is used to turn on/off the power to the CMC. in this case it is a low side switch (switching ground)
The diode must be fast like the mur8100eg
The positive voltage impulse is blocked by the diode. So only one winding is used to produce it.
But when the voltage turns negative (after the positive voltage impulse it continues its resonant ringing)
it is passed through the diode to ground.
You might say, hey but there is some inductance there, blocking the fast flow of negative voltage energy!
But actually the 2 windings are now counter wound, and all inductance is canceled.
Passing the negative voltage straight to ground with no restrictions.
Leaving only a clean positive voltage impulse that stops ringing after the voltage has returned to zero again.
This is based on the bifilar coil series connection, from which both windings look counter wound, canceling their inductance
cmc.png
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cmc2.png
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