https://www.google.com/imgres?q=current%20fed%20push%20pull%20converter&imgurl=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F266522114%2Ffigure%2Ffig1%2FAS%3A392191802396676%401470517220704%2FCurrent-fed-Push-Pull-DC-DC-converter.png&imgrefurl=https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FCurrent-fed-Push-Pull-DC-DC-converter_fig1_266522114&docid=2dgnjh28EeLzCM&tbnid=_McR7CYsN3_9eM&w=405&h=225&hcb=2
Looks nasty to me.
And TinyURL doesn't seem to work lately.
https://www.google.com/imgres?q=current%20fed%20push%20pull%20converter&imgurl=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F266522114%2Ffigure%2Ffig1%2FAS%3A392191802396676%401470517220704%2FCurrent-fed-Push-Pull-DC-DC-converter.png&imgrefurl=https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FCurrent-fed-Push-Pull-DC-DC-converter_fig1_266522114&docid=2dgnjh28EeLzCM&tbnid=_McR7CYsN3_9eM&w=405&h=225&hcb=2
Looks nasty to me.
And TinyURL doesn't seem to work lately.
john larkin <jlarkin_highland_tech> wrote:https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FCurrent-fed-Push-Pull-DC-DC-converter_fig1_266522114&docid=2dgnjh28EeLzCM&tbnid=_McR7CYsN3_9eM&w=405&h=225&hcb=2
https://www.google.com/imgres?q=current%20fed%20push%20pull%20converter&imgurl=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F266522114%2Ffigure%2Ffig1%2FAS%3A392191802396676%401470517220704%2FCurrent-fed-Push-Pull-DC-DC-converter.png&imgrefurl=
Looks nasty to me.
And TinyURL doesn't seem to work lately.
What do you find nasty about that topology, it works well , or does it
remind you too much of Baxandall?
What do you find nasty about that topology, it works well , or does it
remind you too much of Baxandall?
When a fet turns off, it will spike (to kilovolts in simulation) and
ring like a churchbell. Now we need snubbers.
Worse, if the fet turnons are slightly asymmetric, you get DC in the transformer primary and potential saturation. That can cause flux
walking, The Devil's Staircase.
Only half of the primary is used at a time, which uses the copper inefficiently.
It needs another inductor. The waveform at the transformer CT is
ghastly.
Certain Parties want to replace my design with this horror. I'm using
a 4-fet full bridge driving both ends of my primary, from the 48v bulk supply. Nothing goes hi-z, the copper is fully used, and I can add a
series cap to keep DC out of the transformer primary.
john larkin <jlarkin_highland_tech> wrote:https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FCurrent-fed-Push-Pull-DC-DC-converter_fig1_266522114&docid=2dgnjh28EeLzCM&tbnid=_McR7CYsN3_9eM&w=405&h=225&hcb=2
https://www.google.com/imgres?q=current%20fed%20push%20pull%20converter&imgurl=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F266522114%2Ffigure%2Ffig1%2FAS%3A392191802396676%401470517220704%2FCurrent-fed-Push-Pull-DC-DC-converter.png&imgrefurl=
Looks nasty to me.
And TinyURL doesn't seem to work lately.
What do you find nasty about that topology, it works well , or does it
remind you too much of Baxandall?
On 7/19/2024 4:35 PM, john larkin wrote:https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FCurrent-fed-Push-Pull-DC-DC-converter_fig1_266522114&docid=2dgnjh28EeLzCM&tbnid=_McR7CYsN3_9eM&w=405&h=225&hcb=2
https://www.google.com/imgres?q=current%20fed%20push%20pull%20converter&imgurl=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F266522114%2Ffigure%2Ffig1%2FAS%3A392191802396676%401470517220704%2FCurrent-fed-Push-Pull-DC-DC-converter.png&imgrefurl=
Looks nasty to me.
And TinyURL doesn't seem to work lately.
With respect to magnetics it follows the "first rule of government
spending": why have one when you can have two, at twice the price."
The area product of the choke is on the same order as the area product
of the transformer. It's annoying enough when you have to use one
magnetics, much less two...and there are other isolated topologies e.g.
Cuk that offer a constant input current.
But as they remark in the abstract it's nice that they give a thorough
design procedure though and doesn't use any exotic parts, for some applications particularly perhaps in some underprivileged areas of the
world, the "best" converter is the one you can build with what you have available, the tolerances for this one don't look too critical, unlike
the Cuk it doesn't look like it need a PhD to design a loop for.
On Fri, 19 Jul 2024 21:43:00 -0000 (UTC), piglethttps%3A%2F%2Fwww.researchgate.net%2Ffigure%2FCurrent-fed-Push-Pull-DC-DC-converter_fig1_266522114&docid=2dgnjh28EeLzCM&tbnid=_McR7CYsN3_9eM&w=405&h=225&hcb=2
<erichpwagner@hotmail.com> wrote:
john larkin <jlarkin_highland_tech> wrote:
https://www.google.com/imgres?q=current%20fed%20push%20pull%20converter&imgurl=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F266522114%2Ffigure%2Ffig1%2FAS%3A392191802396676%401470517220704%2FCurrent-fed-Push-Pull-DC-DC-converter.png&imgrefurl=
Looks nasty to me.
And TinyURL doesn't seem to work lately.
What do you find nasty about that topology, it works well , or does it
remind you too much of Baxandall?
When a fet turns off, it will spike (to kilovolts in simulation) and
ring like a churchbell. Now we need snubbers.
Worse, if the fet turn-ons are slightly asymmetric, you get DC in the transformer primary and potential saturation.
That can cause flux walking, The Devil's Staircase.
Only half of the primary is used at a time, which uses the copper inefficiently.
It needs another inductor. The waveform at the transformer CT is
ghastly.
Certain Parties want to replace my design with this horror. I'm using
a 4-fet full bridge driving both ends of my primary, from the 48v bulk supply. Nothing goes hi-z, the copper is fully used, and I can add a
series cap to keep DC out of the transformer primary.
On 7/19/2024 11:11 PM, john larkin wrote:
\
What do you find nasty about that topology, it works well , or does it
remind you too much of Baxandall?
When a fet turns off, it will spike (to kilovolts in simulation) and
ring like a churchbell. Now we need snubbers.
Worse, if the fet turnons are slightly asymmetric, you get DC in the
transformer primary and potential saturation. That can cause flux
walking, The Devil's Staircase.
Only half of the primary is used at a time, which uses the copper
inefficiently.
It needs another inductor. The waveform at the transformer CT is
ghastly.
Certain Parties want to replace my design with this horror. I'm using
a 4-fet full bridge driving both ends of my primary, from the 48v bulk
supply. Nothing goes hi-z, the copper is fully used, and I can add a
series cap to keep DC out of the transformer primary.
It says in the text the transistors are supposed to be turned on >simultaneously for a fraction of the cycle.
https://www.google.com/imgres?q=current%20fed%20push%20pull%20converter&imgurl=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F266522114%2Ffigure%2Ffig1%2FAS%3A392191802396676%401470517220704%2FCurrent-fed-Push-Pull-DC-DC-converter.png&imgrefurl=https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FCurrent-fed-Push-Pull-DC-DC-converter_fig1_266522114&docid=2dgnjh28EeLzCM&tbnid=_McR7CYsN3_9eM&w=405&h=225&hcb=2
Looks nasty to me.
And TinyURL doesn't seem to work lately.
https://www.google.com/imgres?q=current%20fed%20push%20pull%20converter&imgurl=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F266522114%2Ffigure%2Ffig1%2FAS%3A392191802396676%401470517220704%2FCurrent-fed-Push-Pull-DC-DC-converter.png&imgrefurl=https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FCurrent-fed-Push-Pull-DC-DC-converter_fig1_266522114&docid=2dgnjh28EeLzCM&tbnid=_McR7CYsN3_9eM&w=405&h=225&hcb=2
Looks nasty to me.
And TinyURL doesn't seem to work lately.
On 7/19/2024 11:11 PM, john larkin wrote:
\
What do you find nasty about that topology, it works well , or does it
remind you too much of Baxandall?
When a fet turns off, it will spike (to kilovolts in simulation) and
ring like a churchbell. Now we need snubbers.
Worse, if the fet turnons are slightly asymmetric, you get DC in the
transformer primary and potential saturation. That can cause flux
walking, The Devil's Staircase.
Only half of the primary is used at a time, which uses the copper
inefficiently.
It needs another inductor. The waveform at the transformer CT is
ghastly.
Certain Parties want to replace my design with this horror. I'm using
a 4-fet full bridge driving both ends of my primary, from the 48v bulk
supply. Nothing goes hi-z, the copper is fully used, and I can add a
series cap to keep DC out of the transformer primary.
It says in the text the transistors are supposed to be turned on >simultaneously for a fraction of the cycle.
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