Electronics > Beginners
Can I build an AC/DC SMPS in 1 month?
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KEIN NEIN:

--- Quote from: pigrew on May 06, 2019, 07:18:22 pm ---
--- Quote from: KEIN NEIN on May 06, 2019, 06:52:49 pm ---or a buck converter maybe?

--- End quote ---

My suggestion would be to build a 5V to 3.3V buck converter, using Arduino to implement the PWM & feedback loop. You would need a few capacitors, resistors, an inductor, and diode (maybe a second MOSFET, too). Perhaps use a pMOSFET as the pass transistor (but a BJT could work, too).

-Nathan

--- End quote ---

thank you

Modern buck converters use two MOSFETs for syncronous rectification right?
I didn't know I could do that with arduino, where can I find more info on that?
pigrew:

--- Quote from: KEIN NEIN on May 06, 2019, 07:39:39 pm ---Modern buck converters use two MOSFETs for syncronous rectification right?
I didn't know I could do that with arduino, where can I find more info on that?

--- End quote ---

Yes, synchronous rectifiers use a second MOSFET to improve efficiency (to avoid diode losses). You can just look at the wiki page for buck converters for help. Building a synchronous rectifier is difficult, and I would suggest making one using a Schottky diode first.

I've never used Arduino (except for my 3D printer), so I don't have any good references for you to look at. However, you'll be needing to make 50~200 kHz PWM, which is certainly within the capabilities of most microcontrollers.  Getting the feedback loop right may be tricky. I'd suggest starting with doing analog simulations of the inductor+transistor to see how they respond.
KEIN NEIN:
Understood, let me see
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