Switching center
Switching center
(OP)
I have an input voltage at 48-54VDC and I would like to convert that to +/- 24-27 VDC.
The currents involved in either or both voltages can be anywhere from 0-3.5 Amps.(I.e. the currents are not always the same in both channels)
A standard OP-Amp controled linear power stage can do it, but I find the power loss too great.
Does anybody know how to make a switcher, that can do it ?
Walker
The currents involved in either or both voltages can be anywhere from 0-3.5 Amps.(I.e. the currents are not always the same in both channels)
A standard OP-Amp controled linear power stage can do it, but I find the power loss too great.
Does anybody know how to make a switcher, that can do it ?
Walker
Talk To Other Members
RE: Switching center
<nbucska@pcperipherals.com>
RE: Switching center
The main users on the dual voltage system will be electromagnetic devices, so say 1 V ripple should be acceptable.
In the meantime I have so far come up with 2 possible solutions on my own.
1
A totem-pole driver switching the 50V at 50% duty-cycle and then an LC-filter to the center "0V"
2
Switching the 50V down/up to +/- 4V from the "0V" center and do it linear from there.
RE: Switching center
squarewave directly -- no filtering is needed.
If the frequency is high enough, you can have very
low current ripple value.
You don't need totem-pole -- one-sided switch is OK.
<nbucska@pcperipherals.com>
RE: Switching center
Also some sort of a filter is in order, as I will have fairly long connections to the various devices.
(radio noise from the wires)
RE: Switching center