B
Ban
- Jan 1, 1970
- 0
w_tom wrote:
That supply does not provide
W_tom, you are wrong, the primary side is insulated by 3 transformers T2,T3
and the always on +5V supply T6. Depending on these transformers will be the
isolation, maybe even 1200-2000V for a short time. The outputs and the
internal circuits are not isolated from each other, which saves a lot of
optos and associated transmission problems. The same is true for the power
good line and the PS-ON line.
I wonder why there would not be galvanic isolation?
That supply does not provide
sufficient galvanic isolation. All appliances must have
internal transient protection. Intel specs demand that
computers be even more robust. But that feedback circuit does
not provide thousands of voltages of isolation. That's right -
thousands of volts. An optoisolator for galvanic isolation
should have been located where those feedback resistors are
located.
Does your power supply for the 'who-dad device' require
galvanic isolation? Maybe. Maybe not. But galvanic
isolation is but another function in power supply design.
This noted because so many buy power supplies on price that
are then missing essential internal functions. Does your
clone computer power supply provide galvanic isolation? If
not, then internal transient protection has been compromised.
This posted just to demonstrate but another complication of
power supply design.
W_tom, you are wrong, the primary side is insulated by 3 transformers T2,T3
and the always on +5V supply T6. Depending on these transformers will be the
isolation, maybe even 1200-2000V for a short time. The outputs and the
internal circuits are not isolated from each other, which saves a lot of
optos and associated transmission problems. The same is true for the power
good line and the PS-ON line.
I wonder why there would not be galvanic isolation?