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Well nearly, the small decoupling capacitor in the circuit which didn't feature the zener is still very much required as your shunt regulator for the driver supply is a very high impedance type and during mosfet turn on you will need a large, albeit short, current spike to swiftly turn on the...
Hi Nicx,
The Vcc pin of UC3843 have an abs.max. rating of 30 volt.
So first of all you will need to deal with that before any power conversion can begin.
I suggest running the regulator-chip at a more comfortable 14-18 volts. Let me know if you need a small schematic on how that can be...
Hi,
I'm not sure I understand your schematic.
I cant find the inductor anywhere, and where I expect it should be there's something else.
Please clean up the schematic and explain what those black box components are.
Best regards.
dead battery voltage ?
A completely flat lead acid battery would be about 1.8 volt pr. cell.
A completely ruined lead acid battery would be anywhere from zero to 1.7 volt pr cell.
This does indeed call for at custom magnetics design. 35uH at 20A (assuming the 200A was a typo) is borderline impossible to find as 'off the shelf'-inductors.
So dig into those magnetics handbooks and design it yourself. Only way forward. I'm currently looking for a way to realise 80uH 25A...
Or the inductor simply has too large a value, which prevents output current from changing at a fast pace. In that case, choose a smaller inductance value.
Re: Advantage and disadvantage of flyback over forward
FvM means that the basic flyback topology can more easily handle large input and/or large output voltage variations compared to a forward topology.
It is indeed very hard to make out what you say.
Are you using some sort of automatic translator service to generate your English?
My guess is that you have a waveform generator IC and you want the output to be more powerful.
How much more?
And at what amplitude/frequence/load?
Is it possible...
two-switch flyback
You are correct.
I accidentally got the leakage and magnetizing inductance swapped.
My apologies. I was not thinking straight yesterday due to a mild flue. If you do not buy that excuse then I have others available :)
And as such my first conclusion is still vaild.
I however...
the two-switch flyback converter
Hi again,
It would seem to be the perfect time to bring up the good old equivalent circuit of the transformer.
**broken link removed**
Sorry for the crude drawing, Bill's good old Paint was what were available :D
I have put a rectifying circuit and a dummy...
Zener failure
Usually harmonics on the mains is the cause for the overload failure of the zener used in such power supplies.
Usually it is the 5th and 7th harmonic which carries the bulk of the energy among all the harmonics. But it depends on the environment your supply is in.
If you have...
dual switch flyback circuit
Hi eem2am,
You are partly correct.
However if we assume that the secondary output voltage is sufficiently low the reflected voltage onto the primary side will not be higher than the input voltage and as such no law will be broken.
But I agree in that it is not...
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