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| What schould I do with a 10V 100A HP Power Supply? |
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| MarkL:
--- Quote from: factory on August 16, 2022, 01:26:33 pm ---Pass it on to someone that actually has a use for it and buy a proper battery charger. And a warning note from Radio Wrangler on the UK vintage radio forum; --- Quote --- from https://www.vintage-radio.net/forum/showpost.php?p=1469474&postcount=33 This needs something a little stronger than a warning, maybe a full Achtung! with optional Klaxons. Using regulated power supplies to charge batteries is a high-risk occupation. Power supplies weren't designed to get power IN at their output terminals. In most cases this can blow output transistors as the reverse Vbe rating isn't enough. Posh power supplies have 'down programming' a shunt transistor to pull the output down if the voltage knob is wound back. Inevitably these aren't beefy enough to pull a serious battery down. In HP we had a steady repair queue for power supplies needing to be fixed. Nearly all in winter when people had tried to use them as battery chargers! If charging a batttery, include a series diode David --- End quote --- David --- End quote --- I would also add that this power supply, and others in this series, incorporate a settable over-voltage detector which triggers an SCR crowbar on the output. If charging a battery without a diode, an over-voltage pulse or erroneous setting can trigger the detector, and BAM! the SCR and other components in the path are toast. |
| nctnico:
Not only that, a shutdown (due to thermal limiting for example) will also trigger the SCR and thus blow the power supply when there is a battery attached. I've seen the internals of an HP supply to which that happened (the owner had slowed the fan down so much that the cooling wasn't effective enough). |
| Electroplated:
--- Quote from: pcprogrammer on August 16, 2022, 12:27:27 pm --- --- Quote from: Kjelt on August 16, 2022, 12:19:33 pm ---Can you crank it up to 12V ? You can start your car when your battery is flat ;) --- End quote --- But then he has to break his back again lugging it down the stairs to get close to his car. :-DD --- End quote --- Block and tackle or a chain lift out of the window will fix that problem :-) |
| AVGresponding:
--- Quote from: Kjelt on August 16, 2022, 12:19:33 pm ---Can you crank it up to 12V ? You can start your car when your battery is flat ;) --- End quote --- 100A is below a typical cranking current, although interestingly 10V would be adequate*; the voltage at a starter motor's terminals can be as low as 7 or 8V due to losses in the battery cables. *EDIT: If you connected the psu directly to the starter motor (rather impractical in most cases). |
| srb1954:
Use it power some TEC modules to make a big thermal test chamber. |
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