Hello. Here is a circuit layout based on the ideas of Edwin Gray and Stefan Hartmann. We all know that when a difference of potential is set along a circuit, the charges goes from one terminal to the other, and finally deplete the source. Now, I explain briefly how the proposed circuit works: We have a DC source of low voltage and high current. This battery is conected to the first coil of a transformer through a chopper circuit, that converts the DC voltage into AC signal to the coil. This branch of the circuit tends to deplete the source as happens on all normal circuits. But now, we have the second coil of the transformer, that transforms the low voltage-high current signal into high voltage and low current, with almost the same power. This signal pass through a diode bridge, and is rectified to be AC possitive values only. Now, we add a DC offset to the potential signal, the same value of the primary DC voltage source. Now, we will connect a load between this potential signal, and the possitive terminal of the primary source (this load can be inductive, capacitive or resistive, and takes the same power the primary source is giving). So imagine that in one end of the load we have a 220 AC potential value with an offset of 12 V DC, and on the other end of the load we have 12 V DC. Then, we are powering the load (because there is a potential difference on its terminals), and also, this branch of the circuit is recharging the battery with the same power that was extracted before instead of depleting it!. Finally, we have the chooper and first coil branch depleting the source, and the second coil, diode bridge, DC offset and load branch recharging it, so the primary source doesn't ever deplete, but the load is being powered!. Can anybody explain me what is happening here?? Only physical explanations allowed.