EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: Psi on August 13, 2023, 03:27:22 am
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I have a charger, it has 4 wires, input and output, and the 2 ground just connects straight through.
It's fully protected from reverse polarity on input and output in terms of my circuit. However there's also the risks created by the common ground.
If the input side, or output side, wires get inverted and there's a ground loop somewhere it becomes a dead short through the ground link inside my device.
Obviously one option to fix this is just make my charger fully isolated.
But I don't want to do that.
Another option is a fuse or poly fuse.
Another option is to make the charger only 3 wire and only have 1 ground.
I'm tempted to do this. But it means my ground path 'takes the scenic route' and runs god knows where to get to ground for either the input or output path. Note that it's a charger so there's the ground of the source and the ground of the battery being charged. Not really a common ground point.
Are there any other options to solve this sort of issue?