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anish-natekar / PicoW_Copter

Affordable micro sub 100g coreless motor quadcopter made using Raspberry Pi pico W and controlled via an APP through WiFi.
https://picow-copter-docs.readthedocs.io/en/latest/
MIT License
47 stars 8 forks source link

flyback diode #4

Closed aashlok closed 9 months ago

aashlok commented 9 months ago

In your present circuit design, what function does zener diode serve when attached to gate of mosfet? When mosfet is turned off where does back emf from motor go? I think back emf would fry mosfet in long run. A flyback 5819 schottky diode at drain of mosfet blocking from vcc seems fine for the purpose.

anish-natekar commented 9 months ago

Hi aashlok, the diode i used is this one- https://robu.in/product/1n4148-surface-mount-zener-diode-pack-of-30/ I referred to this video. this is not a zener diode it is a fast switching diode even if it may look like a zener diode - https://www.youtube.com/watch?v=MHtOtM_yWLw