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Ever thought about ... ?

gkenyon
I was asked a series of interesting questions this week about fault protection and overload protection for a particular application. Some of these really make you think, and the physics doesn't always lead you where you think you'd go.


Dropping out of all this, was me pointing out something interesting which I wonder whether it's ever crossed the minds of contributors to this Forum ... so here goes.


Ever thought about what, in typical UK installations, protects the electronics in a plug-in [to a standard BS 1363-2 socket-outlet] phone charger / wall-wart type power converter against:

(a) Fault current (consider both cases of L-N and L-PE); and

(b) Overload current ?




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    A well designed USB socket should current limit and collapse the voltage before anything bad happens, and recover from short circuits and so forth gracefully.


    The unintended problem of fail safe is that because most do, it engenders a carelessness  in users that is quite dangerous when real power is involved.
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  • 0
    A well designed USB socket should current limit and collapse the voltage before anything bad happens, and recover from short circuits and so forth gracefully.


    The unintended problem of fail safe is that because most do, it engenders a carelessness  in users that is quite dangerous when real power is involved.
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