General > General Technical Chat
Building regulated AC high voltage bench supply.
Wolfram:
--- Quote from: Dan Moos on May 29, 2023, 12:12:34 am ---
--- Quote ---In that case I'd simply take an LM3886 and let it drive a suitable transformer. Sine wave generator as input.
--- End quote ---
I don't know why I didn't think of that. So Basically, I do all my work in low voltage, and then step it up. And I imagine input into the transformer is as regulated as the DC powering the amplifier.
--- End quote ---
The input into the transformer will be as accurate as your signal source and the gain of the amplifier, the supply voltage doesn't factor into this unless it's too low for the amp to generate the required voltage.
The output of the transformer will have worse regulation, largely due to winding resistance and leakage inductance. The resistance tends to dominate for smaller transformers. The best way to work around this is to sense the output voltage and use that to regulate the amplitude going into the amplifier.
NiHaoMike:
Look up "IRS2092" for an amplifier board that's ready to use. Drive that with a DAC and microcontroller. Use a divider from the output back into the microcontroller ADC and use that to correct for voltage sag due to varying load.
David Hess:
--- Quote from: Dan Moos on May 28, 2023, 10:48:09 pm ---
--- Quote ---A class-B, class-AB (lower distortion), or class-D (higher efficiency) power amplifier can directly produce an AC output, or drive a transformer to produce an AC output. These days a class-D amplifier is the way to go and there are many suitable class-D audio amplifier ASICs from companies like TI which make it easy. This takes care of the hard part.
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Ok,I thought about doing it this way. (class ab in fact). Correct me if I'm wrong, but the ripple on my high voltage DC supply would need to be pretty clean for this to work well, right? My experience in high voltage power supplies is with tube amps, and I'm not sure if a full bridge with some filter caps (and maybe a choke?) would get me clean enough DC for this. Maybe I'm wrong?
Would building a discrete regulator for the high voltage DC be prudent?
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There should not be any need to regulate the DC supply because feedback taken from the amplifier's output, or the step-up transformer's output, should remove any variation from the DC supply, except in the most demanding applications.
Xena E:
...You could regulate the AC directly with a saturable reactor, also if you like tube circuitry and have a flair for design you could do the control with hollow state.
Ill get my coat...
Benta:
--- Quote from: Xena E on May 30, 2023, 04:27:58 pm ---Ill get my coat...
--- End quote ---
A better idea would be to get a Naloxone shot.
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