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AC / Li-ion Battery Power Supply: 24 V DC Output for DC Amplifiers

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  • #31
    I know this thread is a bit old but I could use a bit of clarification.

    Am I correct in interpreting the diagram as showing the GND for charging and VBAT- wired together to make the indicated board (-)?

    I know that GND and VBAT- should both be 0 VDC but they don't measure as contiguous connections in the board and I just want to confirm that connecting them together doesn't affect the charge circuit or protection in any way.

    Thanks.
    -Joose

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    • #32
      Originally posted by joosemcgee View Post
      I know this thread is a bit old but I could use a bit of clarification.

      Am I correct in interpreting the diagram as showing the GND for charging and VBAT- wired together to make the indicated board (-)?

      I know that GND and VBAT- should both be 0 VDC but they don't measure as contiguous connections in the board and I just want to confirm that connecting them together doesn't affect the charge circuit or protection in any way.

      Thanks.
      -Joose
      Yes.

      Comment


      • #33
        Thanks very much for the reply, Millstonemike.
        It's a big help.

        Comment


        • #34
          Originally posted by joosemcgee View Post
          Thanks very much for the reply, Millstonemike.
          It's a big help.
          Please post your results. I hope you realized that: (1) This was a theoretical design - I never built it; and (2) It was analyzed by Sure and their recommendation (diode) was incorporated into the schematic.

          Another member was building it but never posted again. So I am interested in your results ...

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          • #35
            only from the batteries (and not switch to direct 24v as per the diagram above), can I Redtube Beeg Spankbang simply connect the boards in series by connecting VBAT+ on board 1 to VBAT- on board 2? Do I need a diode? My end device is pulling 2.0a.
            Last edited by aliouindie; 07-24-2019, 03:24 PM.

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            • #36
              Originally posted by aliouindie View Post
              only from the batteries (and not switch to direct 24v as per the diagram above), can I simply connect the boards in series by connecting VBAT+ on board 1 to VBAT- on board 2? Do I need a diode? My end device is pulling 2.0a.
              Need more info ...

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              • #37
                Millstonemike,

                I would have gladly posted sooner but I was on vacation and I am happy to say, listening to my project which works very well using the power arrangement in your design.

                1) I recognize that your idea was conceptual.

                2) I initially went with the 3 diode arrangement as suggested by the Sure update in post #7 largely because this diagram was given to me by PE Tech support.

                I got a kit for a portable setup from PE and the assembly instructions allude to increasing the power for better performance.
                Direct inquiry regarding this modification got me a copy of the Sure adjusted diagram and no further info.
                Some crafty web searching got me to your initial thread on the concept and then to this thread for the updated design.

                I may have over-rated my diodes, I went with SB1245's partly because I liked the idea of very low forward voltage loss.

                I found that despite using a mechanical switch I had the same power oscillation as indicated in dmormerod's post about the relay.
                Both sets of "Charging" LEDs flashed and the pulse was audible in the playback, I assume mostly because of the constant change in voltage to the amp.
                Frankly, I didn't leave it plugged in long enough to measure for certainty.

                A blocking diode added at BATT+ as you suggested in post #28 cured the pulse and I have not seen it since.

                I have been using my set up on and off for a few weeks now and so far have seen no issues.
                Charging works as expected and the added voltage under battery power provides a welcome boost in volume and performance.

                I'm grateful for your design and even more so for your direct help.

                Thanks again.
                -Joose

                Comment


                • #38
                  Originally posted by joosemcgee View Post
                  Millstonemike,

                  I would have gladly posted sooner but I was on vacation and I am happy to say, listening to my project which works very well using the power arrangement in your design.

                  1) I recognize that your idea was conceptual.

                  2) I initially went with the 3 diode arrangement as suggested by the Sure update in post #7 largely because this diagram was given to me by PE Tech support.

                  I got a kit for a portable setup from PE and the assembly instructions allude to increasing the power for better performance.
                  Direct inquiry regarding this modification got me a copy of the Sure adjusted diagram and no further info.
                  Some crafty web searching got me to your initial thread on the concept and then to this thread for the updated design.

                  I may have over-rated my diodes, I went with SB1245's partly because I liked the idea of very low forward voltage loss.

                  I found that despite using a mechanical switch I had the same power oscillation as indicated in dmormerod's post about the relay.
                  Both sets of "Charging" LEDs flashed and the pulse was audible in the playback, I assume mostly because of the constant change in voltage to the amp.
                  Frankly, I didn't leave it plugged in long enough to measure for certainty.

                  A blocking diode added at BATT+ as you suggested in post #28 cured the pulse and I have not seen it since.

                  I have been using my set up on and off for a few weeks now and so far have seen no issues.
                  Charging works as expected and the added voltage under battery power provides a welcome boost in volume and performance.

                  I'm grateful for your design and even more so for your direct help.

                  Thanks again.
                  -Joose
                  Thanks. Great that it works. I like the Shockley diodes. Less voltage drop. I forget which amp you are using, but many have a reverse polarity protection diode in the DC input. For permanent installations, it's not necessary, just another voltage drop. I bypass them. as a rule. Adds a little extra headroom

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