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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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verpies

#14005
April 28, 2016, 01:16:38 PM
Quote from: lost_bro on April 28, 2016, 11:51:59 AM
A decent choice would be the CREE SiC Schottky diodes.
'Zero reverse current' and essentially zero reverse recovery time (trr).
Which means that such diode cannot take the place of D2.

Jeg

#14006
April 28, 2016, 02:43:16 PM
Hi Itsu
I would try a zener instead of tvs at the base. In addition I think a quicker diode would be better than the 1n4148 at base.

lost_bro

#14007
April 28, 2016, 03:13:43 PM
Quote from: verpies on April 28, 2016, 01:16:38 PM
Which means that such diode cannot take the place of D2.

Hello Verpies

Yes, I did not think it was D2 that *clamped* the flyback spike on the *FET* (IGBT).  D2 must meet the DSRD criterion ( diode capacitance charging/discharging)  Shouldn't that be D1 (fast recovery diode) which clamps (re-routes) the flyback spike?
How much capacitance would be considered *sufficient* to demonstrate the DSRD effect?  The C4D20120 SiC has Ir=65uA @ Vr =1200V  & 175C and Qctotal=130nC @ Vr=800V.
Has anyone ever tried a SiC diode (as D2) in a DSRD setup just for shits & grins?
Maybe something new to try ;D
take care, peace
lost_bro

itsu

#14008
April 28, 2016, 03:28:21 PM
Quote from: Jeg on April 28, 2016, 02:43:16 PM
Hi Itsu
I would try a zener instead of tvs at the base. In addition I think a quicker diode would be better than the 1n4148 at base.


Hi Jeg,

i thought that a tvs would be faster then a regular zener as it is specifically designed for clamping.
Good point for the 1n4148, i could try a bat46 schottky,  thanks.

Itsu

itsu

#14009
April 28, 2016, 03:32:34 PM
Quote from: lost_bro on April 28, 2016, 03:13:43 PM
Hello Verpies

Yes, I did not think it was D2 that *clamped* the flyback spike on the *FET* (IGBT).  D2 must meet the DSRD criterion ( diode capacitance charging/discharging)  Shouldn't that be D1 (fast recovery diode) which clamps (re-routes) the flyback spike?
How much capacitance would be considered *sufficient* to demonstrate the DSRD effect?  The C4D20120 SiC has Ir=65uA @ Vr =1200V  & 175C and Qctotal=130nC @ Vr=800V.
Has anyone ever tried a SiC diode (as D2) in a DSRD setup just for shits & grins?
Maybe something new to try ;D
take care, peace
lost_bro

Lost, 

i think the reflected nano-pulse will be "seen" and being taken care of firstly by the D2 (KD226D) diode.
This is a 800V diode, so i could put 2 in series to handle that pulse, not sure what 2 dsrd diodes in series does to the nano-pulse itself.

Itsu
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