Kapanadze Cousin - DALLY FREE ENERGY

[starcruiser]

   Perhaps you can help to test for this load draw, as I can't read it, nor am I actually interested in the input to output readings. I only comment about this because it has been brought up.  I'm still racking my head over a working feed back path.
  But, as mentioned, if the draw per bulb is only 5 to 10 watts or so for every 100 watt bulb, I would tend to think that that's not too shabby. This can also be improved by further tuning.
  Last night I connected a second yoke to the output of the first one. This second yoke's output is then rectified through a common bridge, then goes to a 200v 470uf electrolytic cap, which is connected to the input side. The results were not as good as when using the MRG coil, connected to the yoke output, and feeding that output to the input. As the rectifier gets very hot, somewhat like what Akula's first device did.
  But, the yoke's output does seam to be much higher than that of the flyback, e-cores, or any other core that I've used so far. And so the additional heat at the rectifier may be due to that as well.

@NickZ, are the rectifiers used designed for higher frequencies than 400Hz? perhaps some Schotky diodes? I am thinking your heating is due to the ratings for the Bridge Rectifiers being used.

[NickZ]

  Ok, guys:
   I've come across these two 200v, 20 amp rectifiers. I'm hoping that I can use them instead of a full wave bridge rectifier. As they seam to be fairly hefty, and I've mounted them on a heatsink, as well.
  Can someone direct me as to how to connect them up to my feed back coil, and feed back capacitor. Also, if anyone has any idea as to what capacitor(s) may work best for this feed back path, please let me know, especially if you've tried it yourself.
 
  The value on these high power switching mode rectifiers is:
   LT 448
   MBR20100CT

   Data Sheet: http://www.datasheets360.com/pdf/-7080483806733188774
   

[starcruiser]

These are 100V peak, 70v RMS diodes. Also doesn't look like these are designed for high Frequency

[gyulasun]

These are 100V peak, 70v RMS diodes. Also doesn't look like these are designed for high Frequency

Hi,

May I chime in with some more info: Here is a more decent data sheet http://pdf.datasheetcatalog.com/datasheet/irf/mbr2080ct.pdf  where it is included that  "high frequency" operation is a feature. Also from another data sheet I found at random search http://www.hestore.hu/files/MBR20100.pdf  this is written:

"For use in low voltage, high frequency inverters, free wheeling, and polarity protection applications"

Unfortunately, the reverse recovery time is not given.

NickZ:  unfortunately you would need two more such diodes (alltogether 4) to form a normal full wave bridge rectifier from these types.  I know that one such diode "body" includes two diodes but these diodes are not independent from each other but they have a common cathode: this prevents to build a full bridge from two such "bodies". 

EDIT 1 to add: the 100V max peak voltage rating may be low for your output voltage?

EDIT 2: There is a full wave rectifier circuit variation with two (independent) diodes but this would double the output DC voltage. The drawback in this circuit for your MBR20100 types is that the output coil ought to give only 50V peak AC to match the 100V max rating. Nevertheless, see the second figure in this link http://www.daenotes.com/electronics/devices-circuits/voltage-multipler   Should you test it, maybe first reduce the number of turns of the output coils or use taps on it. Use one-one diode from the two MBRs.

Gyula

[SeaMonkey]

Those Common Cathode diode arrays
(TO-220) are quite convenient and
some are Schottky for efficient use
at high frequencies.

They're also manufactured in complement
form with Common Anode configuration so
that a pair (one of each configuration) can
be connected as a full wave bridge.

Well done Gyulasun, the datasheets are always
a good place to look.

Common Anode Rectifiers

More Common Anode Rectifiers

Detailed Datasheet MBRF20100CT

MBRF20100CTR Common Anode Rectifier