Kapanadze Cousin - DALLY FREE ENERGY

[Tomtech29]

HI>
I see guys that brainstorming with the unfortunate TL494
what the new changes made Comparing the standard PWM as referred to this phase shift?
-I think this system without feedback loop (It works in the same way) LC inductance changes when the coil heats up and the high state of resonance changes under load!
What is the value added Itsu?

[verpies]

Ok, thats clear, i thought that one requirement of the lossless clamp design was that the primaries consists of several layers around the circumference of the toroid...

Even number of full layers, (with reversing circumferential direction) minimizes the leakage inductance.

Odd number of layers or layers not spanning the entire circumference of the toroid, minimize the energy transfer to the secondary windings and maximize the leakage inductance ...and spikes that go with it.

The above is true for any toroidal transformer.
Such perfect windings also help to make the losssless clamps to be more efficient, but they will also work with imperfect windings...albeit imperfectly.

Lossless clamps work on a principle of doubling the primary winding exactly and subtracting their signals, so it is important that the orange and black windings are exactly the same and in the same place on the core, ...hence the bifilar wind.

[Dog-One]

Lossless clamps work on a principle of doubling the primary winding exactly and subtracting their signals, so it is important that the orange and black windings are exactly the same and in the same place on the core, ...hence the bifilar wind.

With limited winding area on the core, can the optional windings be of considerably smaller wire diameter?  Or would this change the characteristics far too much to still be effective?

[verpies]

With limited winding area on the core, can the optional windings be of considerably smaller wire diameter?  Or would this change the characteristics far too much to still be effective?

Yes, the wire diameter can be smaller, as long as it runs bifilarly parallel along the original primary winding.
The resistance of a smaller wire will be smaller and that will decrease the clamp action somewhat, but not much, since the duty cycle of the current flowing in this additional winding is low (on only during spikes).

[verpies]

I see guys that brainstorming with the unfortunate TL494

IMO, currently the brainstorming refers to what happens after the Power MOSFETs, not before them.

Anyway, what PWM controller do you like better than the cheap and ubiquitous TL494?  Can you do a side-by-side comparison of their specs?

Compare such features as the max frequency, max duty cycle, double outputs for a push-pull front end, voltage mode vs. current mode, pulse-by-pulse current limiting, dead time range, external clocking ability, price, etc...


P.S.
Don't concentrate on output sink/source currents of a PWM controller in your comparison, unless the PWM controller can beat the MOSFET Driver's output specs, such as the UCC37322 specs.