Reactive Current - Parallel RCL

[forest]

This thread started interesting but ended with garbage. It's sad. Reactive energy rise can be converted into real power when there is a source of additional energy.

[nix85]

It is only sad how ironic is the garbage you wrote. Firstly, you totally missed the point and mixed apples and oranges.

I just pointed out that, unlike the common claim, in ZVS circuit we have example of POWER amplification in LC tank, not just voltage or current at the expense of the other, reactive power rises many times the input.

I said NOTHING about conversion of that power into real power, obviously, in ZVS and all conventional devices adding a load increases the real input.

In a conventional transformer which can be plugged into wall 24/7 max current flows through the primary, it is essentially a short circuit, but IV are almost 90° outta phase, no real work is done. Putting a load on the secondary brings IV in the primary into phase and now real work is done.

In ZVS in which input is DC load makes current draw to increase.

There is much that could be said about reactive power and ambient energy but no need to go into that, much has been said on this and other forums already.

[nix85]

Little correction, when transformer is plugged into the wall with no load not max current flows in the primary but exciting current which is current needed to establish the flux in the core + current to compensate for eddy and hysteresis core losses. This current is reactive power. Load on the secondary (in wrongly made underunity transformers) causes the primary current to increase and IV phase shift to decrease.

[hermesatar]

"When resonance occurs in a parallel RLC circuit, a local current circulates between the inductor and the capacitor. This current can be very high, while the circuit current as seen from the source can be low. This phenomenon is used in induction heaters (in the industry for heating metals when necessary, e.g., heating bearings for mounting or dismounting) and in induction cookers (for domestic use).[/size]In such an application a high current is flowing through an inductor, whereas the current provided by the power line is small. This means that the rating of the wires and breakers are much smaller than the current in the inductor."
https://electricalacademia.com/basic-electrical/resonance-series-parallel-rlc-circuit/

Is there any truth in the above statement? Or do every induction heater have a transformer? high voltage/low current primary low voltage/high current secondary? If you use a transformer instead of an inductor can you tap the current from the secondary without increasing the output power from the frequency generator?
Best Wishes, Hermes

[forest]

My tests proved you can have kind of "overunity" by matching the inductance of primary side of transformer with resonant capacitor, but with ordinary transformer it is only apparent "overunity" - you lower this reactive idle current related to iron core hysteresis looses.