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DC-DC converter with floating ground
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electrodacus:
I'm just curious if anyone knows a way the circuit in the diagram below can either have a constant V2 larger than V1 or constant output current different from input current.
To not be accused of setting up a trap
I think that is not possible to have a constant 30V output see question A)
,but it is possible to have a V2 fluctuation between 5V and 30V so Yes for question B) 



The green box can contain any circuit inside no necessarily just a DC-DC converter. It can not contain any energy when connected to the circuit.
It has just two wires connecting to that box so box is in series with the load (100Ohm resistor as example) and the 10V battery



A) Is it possible for V2 to be a constant 30V
B) Is it possible for V2 to peak to 30V multiple times while V2 never drops below 5V ?
magic:
Input and output currents surely are equal because all current entering through the input must exit through the output since there are no other external connections...

Maybe you meant to connect the negative terminals to ground? If so, this looks like an ordinary switching boost converter - obviously they are possible and there is lots of them, and there is lots of information how they work.
electrodacus:

--- Quote from: magic on December 27, 2023, 10:31:57 pm ---Input and output currents surely are equal because all current entering through the input must exit through the output since there are no other external connections...

Maybe you meant to connect the negative terminals to ground?

--- End quote ---

I agree with you but looking to see if this is a common opinion.
I did not meant to connect the negative terminals to ground. The ground on that DC-DC converter is floating.
SiliconWizard:
I'm more used to having the signal flow drawn from left to right, but whatever.

The OP's title explicitely says 'with floating ground', so I'm assuming the drawing matches that and is not a mistake.
Such an arrangement would normally just yield Vout = Vin - some drop, typically a diode drop in the boost converter.
electrodacus:

--- Quote from: SiliconWizard on December 27, 2023, 10:40:49 pm ---I'm more used to having the signal flow drawn from left to right, but whatever.

The OP's title explicitely says 'with floating ground', so I'm assuming the drawing matches that and is not a mistake.
Such an arrangement would normally just yield Vout = Vin - some drop, typically a diode drop in the boost converter.

--- End quote ---

You are allowed to make any modifications you want inside that DC-DC converter short of adding a battery.
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