John:
----- AC --- capacitor --------- bridge rectifier --- output DC cap.
The capacitor will limit current, but consume no power (at least not much). Does this help you MRI?
Ping John Larking
Mar 03, 2009
2 Replies
That's actually interesting; we'd have to rearrange things a little, but it might be possible with the existing transformer windings and such. Probably a resistor+capacitor to limit spike currents. It would need to be a pretty big nonpolar cap, but that happens nowadays.
Thanks for the suggestion.
John
I do that all the time for cheapy appliance control chips (washing machines, etc.), except I have a resistor in series with the cap to control the turn-on surge.
An on-chip shunt regulator controls the chip voltage.
...Jim Thompson
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