Hey there,
i couldn’t fall asleep trying to solve following scenario:
i have two power supplies running 24vdc in parallel, a main and one supplemental power supply. Both are being filtered with capacitors before supplying a single load.
Now if one wants to run it, such that the supplemental power source only supplies when the load draws a certain current, what does that circuit look like?
i was thinking of a mosfet switch but had no idea of how to drive it passively. Maybe an inline resistor after filtering, creating a voltage difference which gets amplified by an opamp which in turn will turn on the mosfet, when a certain voltage at the gate of the mosfet is achieved?
is there a faster, more practical/simple/efficient solution that doesnt require anything but off the shelf components and allows easy tuning of the current threshold at which the secondary supply helps out, maybe with a variable resistor?
The question above is just bugging me for no reason...really without practical applications.
Thank you for any insight!
ka
i couldn’t fall asleep trying to solve following scenario:
i have two power supplies running 24vdc in parallel, a main and one supplemental power supply. Both are being filtered with capacitors before supplying a single load.
Now if one wants to run it, such that the supplemental power source only supplies when the load draws a certain current, what does that circuit look like?
i was thinking of a mosfet switch but had no idea of how to drive it passively. Maybe an inline resistor after filtering, creating a voltage difference which gets amplified by an opamp which in turn will turn on the mosfet, when a certain voltage at the gate of the mosfet is achieved?
is there a faster, more practical/simple/efficient solution that doesnt require anything but off the shelf components and allows easy tuning of the current threshold at which the secondary supply helps out, maybe with a variable resistor?
The question above is just bugging me for no reason...really without practical applications.
Thank you for any insight!
ka