hi guys, I have some nice switched supplies from a server rack, 12VDC 20A .
I need an AC source , roughly 12V 20A. I wonder if it would be possible to just rip out some rectifier parts and have a powerful AC supply , just like you can do with a linear supply.
thanks in advance , Dre
permeke:
hi guys, I have some nice switched supplies from a server rack, 12VDC 20A .
I need an AC source , roughly 12V 20A. I wonder if it would be possible to just rip out some rectifier parts and have a powerful AC supply , just like you can do with a linear supply.
thanks in advance , Dre
At what AC frequency do you require? Your switching PSU runs at several kHz. and is NOT using a sine wave to generate the voltage being rectified and filtered to give DC.
Paul
And what is the magical device that needs 12V 20A AC?
well, I need to drive a large electromagnet for resonating purposes
What are the specs of that "electromagnet"
Maybe a >=250watt class-D car booster amplifier can be used.
Leo..
Wawa:
What are the specs of that "electromagnet"
Maybe a >=250watt class-D car booster amplifier can be used.
Leo..
maybe that's not such a bad idea.
Need to measure but the coil is 3 ohm something so a 1000W amp could do
permeke:
hi guys, I have some nice switched supplies from a server rack, 12VDC 20A .
I need an AC source , roughly 12V 20A. I wonder if it would be possible to just rip out some rectifier parts and have a powerful AC supply , just like you can do with a linear supply.
thanks in advance , Dre
No. Definitely no. SMPS are complex beasts and the whole circuit feedback loop relies on the DC
output rail being sampled and compared to a reference voltage.
And anyway the switching frequency will be way above what you are expecting for 12VAC and totally
inappropriate for an electromagnet.
Why is a simple 12V output mains transformer not suitable? Just cost?
MarkT:
No. Definitely no. SMPS are complex beasts and the whole circuit feedback loop relies on the DC
output rail being sampled and compared to a reference voltage.
And anyway the switching frequency will be way above what you are expecting for 12VAC and totally
inappropriate for an electromagnet.Why is a simple 12V output mains transformer not suitable? Just cost?
good question. I need to find a 12V 30A trafo
Wawa:
What are the specs of that "electromagnet"
Maybe a >=250watt class-D car booster amplifier can be used.
Leo..
Hey Wawa, did a simple test and I must say it works pretty good .
One question though, do I need a kind of snubber circuit on the coil to protect the amp ?
my childish brain says no since a speaker coil does the same.
If the amp is ready made aka designed to drive a speaker, no. Probably has clamping diodes to the rails already.