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Floating DC power supplies

P

PC

Jan 1, 1970
0
I have a floating AC/DC unregulated 48vdc (nominal) linear power supply
,just a transformer,rectifier bridge and filter caps.No problems so
far.The manufacturer has opted to tie the positive output to ground for
safety.Can someone explain why no current flows from the positive
output to ground in this case please ? I need to study some more theory
methinks !
 
J

John Popelish

Jan 1, 1970
0
PC said:
I have a floating AC/DC unregulated 48vdc (nominal) linear power supply
,just a transformer,rectifier bridge and filter caps.No problems so
far.The manufacturer has opted to tie the positive output to ground for
safety.Can someone explain why no current flows from the positive
output to ground in this case please ? I need to study some more theory
methinks !


Current through a circuit requires a circuit (circle). Connecting
ground or your left pinky or any other object to a supply at one
point, only does not complete a circuit. It creates a branch. A dead
end.
 
P

PC

Jan 1, 1970
0
Just realised what a dumb question this was.If one connects the
positive terminal of a car battery ( 'floating') to earth nothing
happens,no current flows....
 
J

John Popelish

Jan 1, 1970
0
PC said:
Just realised what a dumb question this was.If one connects the
positive terminal of a car battery ( 'floating') to earth nothing
happens,no current flows....

Nice to see it making intuitive sense to you, now.
 
J

John Popelish

Jan 1, 1970
0
PC said:
Just realised what a dumb question this was.If one connects the
positive terminal of a car battery ( 'floating') to earth nothing
happens,no current flows....
Nice to see it making intuitive sense to you, now.
 
J

Jasen Betts

Jan 1, 1970
0
I have a floating AC/DC unregulated 48vdc (nominal) linear power supply
,just a transformer,rectifier bridge and filter caps.No problems so
far.The manufacturer has opted to tie the positive output to ground for
safety.Can someone explain why no current flows from the positive
output to ground in this case please ?

the current has to flow in a circuit for some were current flow to ground
there would have to be a path from ground to the negative terminal.

Bye.
Jasen
 
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