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04-07-2013, 07:33 PM | #1 (permalink) |
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Join Date: May 2007
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CCS supply graphs question
Hi,
I've a question about the supply graphing when using a PL8. I've been testing my new PL8v2 charger and I'm very impressed so far. As you'll see from the plot below it was able to charge 3 6S packs in parallel in about 15 minutes. The current draw from the suppy (a converted 870W Hyper PC supply which claims to be able to sustain a 600W 12V load) was 50A which is quite something! Interesting though is the voltage plot. Where is the voltage measured for each plot? I had a DVM connected to the power-supply at it was registering 12.1V at all times. Is the loaded supply voltage drop caused by resistive drop in the leads? Steve
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04-07-2013, 08:53 PM | #2 (permalink) |
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Thank you for posting the graphs. Regarding the supply voltage graph, here's what you are looking at. The charger periodically pauses (very briefly) during the charge to take pack measurements. The "loaded supply voltage" is the supply voltage during the period current is flowing. The other voltage is the unloaded supply voltage. The difference between these two values is the supply noise. When the supply noise levels are high, that indicates the supplies voltage regulation is not up to the task.
In your plot the loaded supply voltage increases inversely proportional to the current being lowered. As the load the reduces the, loaded supply voltage slowing increases. When calculating the supply's wattage output use the loaded supply voltage in your calculations, not the voltage value.
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04-07-2013, 09:38 PM | #3 (permalink) |
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With 0.9V noise @ 50A load the power supply looks decent enough to me
Thanks for the detailed explanation of how the PS voltage is measured, Greg.
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04-07-2013, 10:22 PM | #4 (permalink) |
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Glad to help. For comparison I have some HP DPS-600pb supplies, 47 amps max. At 45 amps the supply noise is 2v.
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04-08-2013, 01:26 AM | #5 (permalink) |
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Thread Starter
Join Date: May 2007
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Thanks. That makes sense now. As I mentioned before I was measuring the voltage at the supply and saw no voltage drop at all, so this must be in the cabling. I made an EC5 to 4mm bullet lead, only about 8cm long, using 12AWG cable. At 50A this actually gets warm!
Steve
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