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Diamond buffer?
Symmetrical supply from Single.?
- Thread starter Onedrop
- Start date
Interesting circuit.
Do you have any perfomance info on that?
John Broskie did quite an analysis of it here. It's quite a common circuit, generally shows up using bipolar transistors, the basis of the current-feedback op-amp, and Burr-Brown's and Nat-Semi analogue buffers. (BUF600, LMH6321)
The tracking error when currents are unequal will be be the output current minus the drive-stage current divided by Gfs, but no-one has yet said just how accurately it has to track!
PS. On second thoughts, perhaps it would work better with Darlingtons. More Gfs and bettery symmetry.
The tracking error when currents are unequal will be be the output current minus the drive-stage current divided by Gfs, but no-one has yet said just how accurately it has to track!
PS. On second thoughts, perhaps it would work better with Darlingtons. More Gfs and bettery symmetry.
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An Inline Boost Covertor will not meet the requirements, no?
Yes, sorry, we got a bit off topic with the supply splitter.
I used a Čuk converter run open-loop driven by a squarewave in a similart situation - to generate a -12V supply to run audio off a 12V battery. Tracking isn’t perfect ( but I can’t think of many situations where it has to be), but the circuit is simple and fairly free of interference on either supply,
How do you arrange the common ground between the source power supply and the "isolated" converter?
Who mentioned isolation?
Several people: this is a duplicate of post#18
@Alec_t mentioned it.
You could use a switch-mode DC-to-DC converter to get an isolated 54V output. Which way round you connect the output wires would dictate whether that's +54V or -54V.
and at least one other person mentioned as a potential solution.
@Ramussons also mentioned it
The DC-DC Isolated convertor will give you -54 volts.
I actually misread the original post and thought he was starting from a DC supply that was lower than 54 volts, and wanted to end up with a bipolar supply of 54-0-(-54). Apparently he just needs a boost converter and it doesn't need to be isolated. He still has to worry about efficiency and having sufficient headroom on his primary supply.
@Alec_t mentioned it.
You could use a switch-mode DC-to-DC converter to get an isolated 54V output. Which way round you connect the output wires would dictate whether that's +54V or -54V.
and at least one other person mentioned as a potential solution.
@Ramussons also mentioned it
The DC-DC Isolated convertor will give you -54 volts.
I actually misread the original post and thought he was starting from a DC supply that was lower than 54 volts, and wanted to end up with a bipolar supply of 54-0-(-54). Apparently he just needs a boost converter and it doesn't need to be isolated. He still has to worry about efficiency and having sufficient headroom on his primary supply.
If that's what you mean then simply connect the +54V terminal of the isolated converter to the 0V terminal of the other +54V supply. Then you have +54V/ 0V /-54V.
It depends on where the supply to the converter is from. If it is from the mains, then of course it needs to be isolated, but if it is powered by the +54V supply then it doesn't, and generally, non-isolated supplies are more efficient than isolated supplies and easier to keep stable.
It depends on where the supply to the converter is from. If it is from the mains, then of course it needs to be isolated, but if it is powered by the +54V supply then it doesn't, and generally, non-isolated supplies are more efficient than isolated supplies and easier to keep stable.
I believe they are different things. Your mileage may vary.Maybe there is a confusion in the nomenclature.
Isolated = Floating Output
Since words often fail us a schematic would have been helpful. In this entire thread there is a distinct lack of them, except for the unrelated "diamond buffer" which was peripheral to the main discussion.
