Electronics > Beginners

150W boost converter

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Arjunan M R:

--- Quote from: electroguy98 on June 02, 2019, 05:13:30 pm ---
--- Quote from: Arjunan M R on June 02, 2019, 05:01:54 pm ---
--- Quote from: electroguy98 on June 02, 2019, 04:49:58 pm ---Input voltage=12V output voltage = 36V
I'm using atmega328p so I'm keeping the frequency low because the pwm gets distorted at very high frequencies. Anyway i do have an LCR-T4 meter so i want to know if an air cored inductor will work. I'll try to arrange for a toroid core.
Thanks!

--- End quote ---
Are you using microcontroller as a switching controller.
If it is that's not the right way to do it.You should use a boost converter IC. You don't get all the features in a boost converter IC in a MCU. Like softstart etc. If you're using a MCU you need also a separate MOSFET for switching. In a boost converter ic it's all integrated. Or if you are going to use a external MOSFET there are switching controllers which can achieve a very high frequency.And they are not very expensive. You should use switching controllers when dealing with very high current that you need.

--- End quote ---
Microcontroller or boost converter IC, i still have to make an inductor. So will an air cored inductor do the job?

--- End quote ---
Sorry, I don't know.

Arjunan M R:
I have never seen an air cored inductor in a smps or boost converter.
That doesn't mean it won't work.

madires:

--- Quote from: electroguy98 on June 02, 2019, 05:13:30 pm ---So will an air cored inductor do the job?

--- End quote ---

No, but a ferrite core with an air gap or an iron powder core (distributed air gap).

strawberry:

--- Quote from: Arjunan M R on June 02, 2019, 04:42:51 pm ---
--- Quote from: strawberry on June 02, 2019, 04:31:30 pm ---
--- Quote from: Arjunan M R on June 02, 2019, 03:48:42 pm ---I don't recommend building an inductor yourself(unless you have an LCR meter)

--- End quote ---
Not at all.  L=N^2 * AL 
for T106-26  30(turns)^2*93nH(AL)=83700nH

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;D I don't understand anything in that formula except L & N.
Can you explain?

--- End quote ---
L = inductor inductivity . N = coil turns . AL = core inductance value (found in datasheet or estimeted for custom core)

DannyTheGhost:
There is no air core inductors in SMPS mainly because you need a lot more wire turns to get desirable inductance, which means a lot more energy loss in the wire -> less efficiency

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