Akula0083 Light No3 - Dual TL494

[d3x0r]

You have to be very careful with the orientation of coils that are coupled thus making transformers using K elements.

Yes; I removed the coupling to make sure the currents were flowing the 'normal' direction so the dots are all correct (in non reversed) so enabling mosfets causes what I would expect for a current.... and coupling just one to the L1 pickup sort of causes a current in the right direction on that... but it's like there's infinite impedance to that current until L2/L3 have no current...

[Jeg]

A small hint that no one mentioned  it, is that the led arrays are used to lower the transformer output at a constant 12v for the main pwr supply. Measure your output and put as many arrays needed for making the right voltage input supply.

[MarkE]

Yes; I removed the coupling to make sure the currents were flowing the 'normal' direction so the dots are all correct (in non reversed) so enabling mosfets causes what I would expect for a current.... and coupling just one to the L1 pickup sort of causes a current in the right direction on that... but it's like there's infinite impedance to that current until L2/L3 have no current...

The way you have your voltage sources set up M2 turns on coincident with M1 every third M1 pulse.  If L2 and L3 are wired for push-pull operation they will cancel flux when both M1 and M2 are on simultaneously.  If they are wired for parallel operation, then there is nothing to limit the flyback voltage that will appear at the drains of M1 and M2.

[d3x0r]

The way you have your voltage sources set up M2 turns on coincident with M1 every third M1 pulse.  If L2 and L3 are wired for push-pull operation they will cancel flux when both M1 and M2 are on simultaneously.  If they are wired for parallel operation, then there is nothing to limit the flyback voltage that will appear at the drains of M1 and M2.

They are wired to be independantly driven by separate tl494; and it's my hypothesis that it should be coincident and 1 and 3x frequency or 1 in 3 hits coincident.
One would think that if both turned on together; barring insufficient voltage;  that it would be essneitally the same as if they were connected in series and pulsed with a single source?


it's based off of JB's schematic....

[MarkE]

They are wired to be independantly driven by separate tl494; and it's my hypothesis that it should be coincident and 1 and 3x frequency or 1 in 3 hits coincident.
One would think that if both turned on together; barring insufficient voltage;  that it would be essneitally the same as if they were connected in series and pulsed with a single source?


it's based off of JB's schematic....

I haven't gone through JB's schematic.  What I can tell you is what I have:  If M1 and M2 turn on simultaneously then as you show L2 and L3 the coupled flux cancels out reducing the effective inductance of each winding to 1/20th of what it is when just one or the other MOSFET turns on.