Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

Quoting myself:

See the altered diagram from here.
If you go to that article - it is the lower left one.

If that diagram is redrawn so that the two windings are connected and more positive potentials are placed higher on this diagram, then a more intuitive one is obtained:

[itsu]

Thanks.  Are TVS diodes installed ?
For analysis of periodic waveform it is advantageous to view the entire cycle on the scope's screen, but viewing 2 cycles is too much, because it worsens the horizontal resolution.

So viewing 1 cycle <= on screen < 2 cycles, is the best.

Yes,  TVS's (54V) still installed

Ok, about the entire cycle etc. but i meant thats what i was showing 1 entire cycle instead of 2, so i am not sure why you asked that as that was what i was showing (i think    )


Itsu

[verpies]

I'd like to remark, that Jeg is right about the current flowing through the MOSFET's body diodes but not at the time he thinks (when the other MOSFET turns on/closes/starts conducting).

What is bothering me now is the negative current inside the 2μs "gray zone" on the scopeshot below.
Note, that in this zone both MOSFETs are OFF, no energy flows from the power supply nor from snubber capacitors nor from energy storing components on the secondary windings BUT the negative current increases in this zone

Could it be because the current through the TVS diode decreases while the current through the body diode increases ?

[itsu]

I put up slightly more then 1 cycle @ 8us gate time, both gates.

first screenshot is at current point 2  (current through drain) 
second screenshot is at current point 3 (current through TVS) 

Itsu

[itsu]

I'd like to remark, that Jeg is right about the current flowing through the MOSFET's body diodes but not at the time he thinks (when the other MOSFET turns on/closes/starts conducting).

What is bothering me now is the negative current inside the 2μs "gray zone" on the scopeshot below.
Note, that in this zone both MOSFETs are OFF, no energy flows from the power supply nor from snubber capacitors nor from energy storing components on the secondary windings BUT the negative current increases in this zone

Could it be because the current through the TVS diode decreases while the current through the body diode increases ?

You say: "Note, that in this zone both MOSFETs are OFF" but do you not mean "both GATES are OFF" because i clearly see the yellow MOSFET being ON in that time.

You also say: "no energy flows from the power supply nor from snubber capacitors ......."   but be aware we have no snubber capacitors right now, only 54V TVS's.


Itsu