B
Boris Gjenero
- Jan 1, 1970
- 0
How hard is it to modify a computer switching power supply that
normally works off 120V AC to work off "12V" automotive power. I
guess I'd want it to at least work of 11.5 to 14.5V DC.
I'm assuming that I could keep the secondary windings and
secondary-side components, including the control circuitry, but would
need to rewind the primary and change practically all of the
primary-side stuff.
Could I use 160 to 12 as the ratio for decreasing the number of turns
and increasing the wire thickness in the primary? Does the wire
thickness have to be exact or will thicker wire be ok if it fits?
What about if the power supply has multiple transformers, just rewind
all the primaries?
I suppose at the much higher new primary currents a different sort of
switching transistor would be needed. What would you recommend? A
low Rds MOSFET?
I suppose I should put some sort of filtering on the input. Is it
necessary for reasons other than RFI? (ie. will something be damaged
or not work if the power supply draws it's current in pulses) What
sort of filter should I use, just L-C?
Any other concerns? Has anybody done something like this?
normally works off 120V AC to work off "12V" automotive power. I
guess I'd want it to at least work of 11.5 to 14.5V DC.
I'm assuming that I could keep the secondary windings and
secondary-side components, including the control circuitry, but would
need to rewind the primary and change practically all of the
primary-side stuff.
Could I use 160 to 12 as the ratio for decreasing the number of turns
and increasing the wire thickness in the primary? Does the wire
thickness have to be exact or will thicker wire be ok if it fits?
What about if the power supply has multiple transformers, just rewind
all the primaries?
I suppose at the much higher new primary currents a different sort of
switching transistor would be needed. What would you recommend? A
low Rds MOSFET?
I suppose I should put some sort of filtering on the input. Is it
necessary for reasons other than RFI? (ie. will something be damaged
or not work if the power supply draws it's current in pulses) What
sort of filter should I use, just L-C?
Any other concerns? Has anybody done something like this?