Series Connect Lab SM Power Supplies

Leakage current = 1.12A at 30V and 125C. Better not warm it up too much. ;-)

Since they'll only go to 16V, that shouldn't be problem...

Best regards, Spehro Pefhany

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Ah! Correct! My oversight.

Thanks.

If the negative is grounded, as implied by the other post, you're screwed.

For floating supplies, I've been screwed too. Power supplies are not designed to have current stuffed into their outputs. And some were designed by clueless engineers and not tested beyond the published specifications. Or some manager decided to save a dime by removing some protection circuitry he didn't understand. Couldn't ask the engineer, 'cause they laid him off.

I've had power supplies that would lock up. When the reverse current went away, they'd go to full voltage at maximum current. Silicon diode was not sufficient to prevent it. Didn't try a lower voltage diode. Reverse diode is essential, but may not save you...test it.

Use a single diode. Series won't work; parallel has matching and thermal problems. Probably works most of the time. Compare the cost of blowing up what you're powering or the supplies to the cost of the diode. Decide accordingly.

You can get some interesting limit-cycle oscillations, depending on the nonlinearity of your load and foldbackness of the TWO current limits. Once one output goes negative, you can't rely on what the current limit will do. Test it.

If you want an example of a limit-cycle oscillation, power a disk drive from a supply with limit set lower than what it takes to spin it up. Don't use a drive you care about.

Yes, cheap Chinese tends to lack adherence to any standard.

Still, most DC supplies are full floating, regardless of whether a ground terminal has been provided as a quick jumper point or not.

Those that do not have the grounding lug typically have the EARTH ground symbol on the negative output terminal. Floating supplies will show polarity, but no ground symbol.

Again, they are all typically full floaters because the supply maker does not know whether the user wants a positive or negative supply. Hard grounding one lead takes that choice away.

0.15V x 5. (in series) (which would not work for this application to begin with).

Are you saying that they drop three quarters of a volt each?

You are an idiot.

They need to be in parallel and they need to all be thermally bonded to each other, which still may not work.

Fuck off and die, Williams, you stupid putz!

You might want to look into that. Look closer.

Smarter than ANY of you retard bandwagon dolts.

You lacks an education.

I can work 12 hour days, and still come home to pile it on to a retarded twit like you. You deserve less.

"The Great Attractor" wrote in message news: snipped-for-privacy@4ax.com...

They sound like Bertan supplies. I think they offer some isolation. Are they 6kv supplies? BNC connectors with a 3" phenolic insert?

Cheers

Interesting. .15V X 5 = .35V in AlwaysWrong land. Now that we have your arithmetic aptitude nailed down...

No, I'm saying that you're *ALWAYS* wrong, AlwaysWrong.

I'm not the one who believes that .15V * 5 = .35V, AlwaysWrong.

Irrelevant.

Isn't it soooo cute when AlwaysWrong calls people stupid?

It was nailed down back when we saw he couldn't calculate the flight time of light between planets. This is just confirmation of his lack of aptitude.

ftp://jjlarkin.lmi.net/Bertan_HV.JPG

The connector barrel is zero ohms to the chassis.

You are AlwaysWrong.

John

He can't do multiplication. Probably can't add, either.

That's a lot more sanitary than what he usually calls them.

John

snipped-for-privacy@austolux.com (Larry Underwood) wrote in news: snipped-for-privacy@news.tpg.com.au:

SERIES diodes will each pass the -total- current,it will not increase the current capacity of each diode. thus,you would have a diode failure,the one that was the weakest of the string.

Paralleling the diodes would "increase" their current capacity(spreading the current flow through each branch),but it's not a recommended practice.the diodes would not all have the exact same V-forward drop,and currents thru each would not be equal,one diode might get more than it's rating.

You need a basic electricity course. learn about series and parallel circuits,and their current flows.

--
Jim Yanik
jyanik
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dot com

John Fields wrote in news: snipped-for-privacy@4ax.com:

the power supplies should say right on the panel if the outputs are floating or one pole grounded,and give a rating of how high one can elevate the floating supply. (usually 600V?) it depends on the insulation resistance of the transformer.

I would think that lab/bench supplies would have floating outputs,with provision for a movable link to a ground post,that you could ground either Pos or Neg side of the supply if desired.

--
Jim Yanik
jyanik
at
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dot com

will

Maybe not with a personality as offensive as shown here. Think about how it would go in an interview.

?-)

"John Larkin" wrote in message news: snipped-for-privacy@4ax.com...

That?s an old one, before they moved to hicksville.

Cheers

Before or after the HR people take a baseball bat to his skull?

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