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Overunity Machines Forum



Kapanadze Cousin - DALLY FREE ENERGY

Started by 27Bubba, September 18, 2012, 02:17:22 PM

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0 Members and 125 Guests are viewing this topic.

T-1000

Hi verpies,

In regards to MOSFET Driver Layout.png
The R2 should be replaced with fast switching diode to drain gate charge fast as possible. That will kill ringing when mosfet driver switches on its lower internal mosfet for this. The higher internal gate-source capacitance of MOSFET usually is a cause.

The http://www.ti.com/lit/an/slpa010/slpa010.pdf have more info in this topic.

Cheers!

verpies

Quote from: T-1000 on March 10, 2016, 04:42:02 AM
The R2 should be replaced with fast switching diode to drain gate charge fast as possible.
Following that train of reasoning - why not eliminate the gate resistors altogether?

T-1000

Quote from: verpies on March 10, 2016, 06:52:48 AM
Following that train of reasoning - why not eliminate the gate resistors altogether?
Each MOSFET gate-drain have maximum peak current which need to be limited on power-on. On power-off the maximum value will not be reached so this is is why it is safe to create direct gate discharge path.

P.S> You can see such implementation in Tesla driver I posted previously.

verpies

Quote from: T-1000 on March 10, 2016, 07:00:28 AM
Each MOSFET gate-drain have maximum peak current which need to be limited on power-on. On power-off the maximum value will not be reached...
Why will it not be reached during "power-OFF" ?

Quote from: T-1000 on March 10, 2016, 07:00:28 AM
so this is is why it is safe to create direct gate discharge path.
Since the gate current flows only through R1 during "power-ON" and only through R2 during "power-OFF", why did you recommend a diode in place of R2 ?
By following this train of reasoning - wouldn't the complete elimination of R2, discharge the gate even faster?

T-1000

Quote from: verpies on March 10, 2016, 08:08:04 AM
Why will it not be reached during "power-OFF" ?
Since the gate current flows only through R1 during "power-ON" and through R2 during "power-OFF", why did you recommend a diode in place of R2 ?
By following this train of reasoning - wouldn't the complete elimination of R2, discharge the gate even faster?
In that case, just build driver board like it is shared and said, then you can see it that works... ;)

The Tesla coil driver works perfectly in my place by the way.