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Overunity Machines Forum



MCP1406/07 MOSFET DRIVER

Started by Jeg, September 30, 2013, 03:53:33 PM

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gyulasun

#25
November 16, 2013, 06:56:44 AM
Quote from: Jeg on November 16, 2013, 06:45:07 AM
...
The test Transformer is made by 17 turns of bifilar wire around a tv flyback trans. ferrite.

Well, perhaps the air gap is too wide, a much smaller gap would be better to further increase self inductance of the coax coil to reduce excessive load on the driver IC due to a smaller self inductance at the lower audio frequencies.

Jeg

#26
November 16, 2013, 06:57:46 AM
I just show your answer and and you are right. I will fix it on the schematic ;)

Jeg

#27
November 16, 2013, 07:00:23 AM
The gap is there by default for avoiding saturation on the tv flyback trans. I will try to put a piece of metal sheet between the legs...

gyulasun

#28
November 16, 2013, 07:03:31 AM
Quote from: Jeg on November 16, 2013, 06:53:44 AM
What i am thinking here is about the positive and negative pulses that feeds mosfet after the isolated transformer. The amplitude of both pulses would be the same. Dowesn;t need the negative one to be smaller in a certain range? Is it better to rectify the outgoing pulse before the mosfet?

Well, I do not really know if there is a need for a smaller negative pulse amplitude in a certain range versus the positive pulse, (normally it does not?)
I do not think you need to rectify the pulse befor the mosfet.

gyulasun

#29
November 16, 2013, 07:05:58 AM
Quote from: Jeg on November 16, 2013, 07:00:23 AM
The gap is there by default for avoiding saturation on the tv flyback trans. I will try to put a piece of metal sheet between the legs...

Yes that is okay but on the input side of the MOSFET you do not have such high input power which would bring the core towards saturation?  The paper referred to much smaller ferrite toroid cores, your flyback transformer has got a much higher cross section area.
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