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DC-DC converter with floating ground
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electrodacus:

--- Quote from: SiliconWizard on December 27, 2023, 11:09:07 pm ---By transforming a quadripole into a dipole, it will be hard to get anything else than |V2| <= |V1|.
Maybe we can try leveraging some quantum effect.

--- End quote ---

So you are saying that there is no way to get V2 above V1 even for a short period of time ?
The DC-DC converter (jut a name can be any configuration you want i side) can supply itself internally so instead of just wasting that energy as heat it can charge a capacitor that then can connect in series with the battery.
magic already mentioned that.
SiliconWizard:

--- Quote from: electrodacus on December 27, 2023, 11:14:03 pm ---
--- Quote from: SiliconWizard on December 27, 2023, 11:09:07 pm ---By transforming a quadripole into a dipole, it will be hard to get anything else than |V2| <= |V1|.
Maybe we can try leveraging some quantum effect.

--- End quote ---

So you are saying that there is no way to get V2 above V1 even for a short period of time ?

--- End quote ---

No, for a transient, the question is obvious and answered already by magic. Just put anything in series which has a charge. It will just be extra energy that has been stored previously though.
But once this charge is depleted, game over. So what does that bring to the table?
electrodacus:

--- Quote from: SiliconWizard on December 27, 2023, 11:19:01 pm ---
No, for a transient, the question is obvious and answered already by magic. Just put anything in series which has a charge. It will just be extra energy that has been stored previously though.
But once this charge is depleted, game over. So what does that bring to the table?

--- End quote ---

Say you have 10V battery and load is just a simple resistor in parallel with a low value capacitor.
The box called DC-DC converter has an actual DC DC converter inside that charges a capacitor to say 20V
Input to DC-DC converter is the battery positive directly and GND is trough the Load.
After the capacitor is charged it is disconnected from the internal DC-DC converter and connected across the input and output of the green box. So you have 10V battery in series with a 20V capacitor and then with the load that is a resistor in parallel with a small value capacitor.
The logic can be done by a micro controller and moving the capacitor can be done with mosfets.

Of course this cycle can be repeated say once every few seconds or whatever is needed to charge and discharge that capacitor and during the charge period the Load voltage V2 will be quite a bit lower than V1 but then for some other period V2 can be larger than V1.
SiliconWizard:
You can't do that if your only return path is through the load. As shown in the diagram.
electrodacus:

--- Quote from: SiliconWizard on December 27, 2023, 11:43:51 pm ---You can't do that if your only return path is through the load. As shown in the diagram.

--- End quote ---

You mentioned something about a diode voltage drop in your initial posts.
So if there is a voltage drop between input and output and a current flow will that not result in energy being dissipated as heat inside the DC-DC converter box mostly on that diode ?
Can you not just take that energy and charge a capacitor instead of wasting it as heat ?
The return path is trough the load.

I think you are imagining that the box is just a DC-DC converter. I mentioned that you can have anything you want in that green box just not a battery or a hamster.
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