TransWikia.com

Non-shorting SPDT switch using MOSFETs

Electrical Engineering Asked on October 29, 2021

My goal is to design a circuit using MOSFETs that would switch 12V power to one of the two high-current loads, using high-side switching. Control is done by a 3.3V MCU. The reason for using MOSFETS is to keep the size down.

This is my current design. The problem is that there’s a short period when both of the MOSFETs are on.

enter image description here

One obvious solution would be to separate the control of the circuits so that both could be turned off before switching between the loads. The downside being that the responsibility for keeping the loads from being turned on at the same time shifts to software.

I’ve looked into using gate drivers, but unless I’m missing something, there doesn’t seem to be a driver for a pair of P-MOSFETS which is what I think I need to be using for high-side switching.

One Answer

Use something like this to split the gate drive signals to the N-channel MOSFETs: -

enter image description here

Answered by Andy aka on October 29, 2021

Add your own answers!

Ask a Question

Get help from others!

© 2024 TransWikia.com. All rights reserved. Sites we Love: PCI Database, UKBizDB, Menu Kuliner, Sharing RPP