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Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
Hello everyone,
I am just still trying to get an idea of what to build, but the general interest is to make a power supply for a small coil of mine, with a voltage range of 300-400VDC or so.
the one thing Im having an issue with, is desiding the style of feedback/driving method.
my original method was just to use an oscillator, but I think feedback would be preferable, however I searched around, and Im still stumped on just how to do this. current transformer on the secondary side perhaps?
if you know any methods of feedback either then a CT, or if you find any faults with this design, I will greatly appreciate your help.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Real good quality SMPS never use self-oscillating feedback, as far as I know. It's always an oscillator built into the controller chip.
The cheap ones (electronic ballasts for fluorescent lights, solid-state NSTs, electronic transformers for 12V halogen lamps) use a self-resonant circuit with BJTs as the power devices. But it's hard to vary or regulate the output voltage of a self-oscillating SMPS.
Most SMPS don't have a resonant transformer anyway. Only the latest designs that are shooting for lots of watts per cubic inch, and those run special controller chips meant for resonant circuits.
Supplies running off the line never use that push-pull topology either, because the devices need to be rated at pi times the supply voltage.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
How much current do you want to generate and what type of regulation are you looking for? You could make a mazilli circuit with your own windings on a flyback and make a emitter follower regulator with 1500v TO-3 transistor. Current is the determining factor
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Push pull SMPS - feedback?
