07-06-2013, 07:57 AM
(This post was last modified: 07-06-2013, 08:01 AM by camallison.)
Caught him reading his emails over breakfast! His response is:
" Because of the lack of a residual gap in the magnetic path, toroidal transformers also tend to exhibit higher in rush current, compared to laminated E-I types."
He reckons anything up to double or treble has been witnessed, hence the slow blow fuse. He himself has seen 50 to 60% and more. A solution can be to add an NTC in the circuit to limit the current although these tend to heat up (as expected) and need a good 60 seconds cooling after switch off before attempting a restart otherwise their efficacy is reduced.
Colin
" Because of the lack of a residual gap in the magnetic path, toroidal transformers also tend to exhibit higher in rush current, compared to laminated E-I types."
He reckons anything up to double or treble has been witnessed, hence the slow blow fuse. He himself has seen 50 to 60% and more. A solution can be to add an NTC in the circuit to limit the current although these tend to heat up (as expected) and need a good 60 seconds cooling after switch off before attempting a restart otherwise their efficacy is reduced.
Colin
