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Registered Member #1749
Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
I am just trying to find the right inductor core to get me to 50vdc from 12v high current I am hoping it is possible to go past 10A the boost converter is new to me my core I think will do the job it is 1/3.4 inch outer diameter 1 inch inner diameter and it is 1 inch wide powdered iron.
Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
This seems a ferrite core and will saturate without a gap. 10A 12V is way too much for core cross section, it will saturate unless you go to a ridiculously high swiching frequency. Try to find a powdered ferrite core, or a E-I ferrite core of a small transformer with internal gap, it should work ok.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Get a gapped ferrite core or an iron powder one. Better still, I would use a forward converter as I believe they run more efficient. Remember that with boost converter, the transistor turns off with maximum current flowing so the switching losses are really big.
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
Get a powdered iron toroid from Micrometals. I'd recommend type-52 or type-35. The required size will depend on switching frequency, cooling provisions, ambient temperature, and whether you meant 10Amps out at 50volts or 10Amps in at 12volts.
Beware that if you want the output to be REGULATED to maintain it at 50volts in the presence of line and load variations, then you will have to deal with the control issues of the right-half-plane zero if you use a continuous-mode boost converter. For those reasons and the efficiency issues mentioned earlier, a forward derived converter might be the easier option to build.
Registered Member #1749
Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
GeordieBoy wrote ...
Get a powdered iron toroid from Micrometals. I'd recommend type-52 or type-35. The required size will depend on switching frequency, cooling provisions, ambient temperature, and whether you meant 10Amps out at 50volts or 10Amps in at 12volts.
Beware that if you want the output to be REGULATED to maintain it at 50volts in the presence of line and load variations, then you will have to deal with the control issues of the right-half-plane zero if you use a continuous-mode boost converter. For those reasons and the efficiency issues mentioned earlier, a forward derived converter might be the easier option to build.
-Richie,
Thank you for the information I was trying to get 10A at 50v witch I think means I have to push allot of current at 12V to get desired operation.
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
> I heard that it's best to use push-pull topology when high input current and low working voltage are needed.
I'd second that. You only have a single switching device carrying the high input current at any one time, and the total input current is shared between two devices. The voltage spikes from the transformer's leakage inductance are also manageable with 100V devices when the input voltage is only 12V.
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General purpose boost converter project.
