Radiant power from Solid state Tesla hairpin circuit

[onepower]

NdaClouDzzz

There is. But you must first start thinking in terms of intensity rather than quantity.

Many like Tesla and Victor Schauberger claimed we should be more concerned with the "Qualities" of a given form of energy rather than the quantity.

What qualities does one form have that another does not and how do these relate to one another.

For example, my hair pin circuit could light a small bulb under water ten feet away using one very small 30ga wire conductor. The qualities of the energy are not like low voltage AC/DC or HV because I could hold the wire and not get a shock. The form of energy discharged from a hair pin circuit has many very specific qualities.

The common thread among the greatest inventors was that they were more concerned with the qualities something possessed. That is, a distinctive attribute or characteristic possessed by something. How something measured against other things of a similar kind or how they differed. These inventors did many experiments looking for new phenomena with different qualities than we know. They would pay great attention to all the little details most would ignore always trying to refine and expand upon the process. Thus that little quirk which most ignored could become a great force within the devices they built.

The devil is always in the details...

[fejleszto]

So, I've made a new setup a some measurements. I use solenoid coils. The "kicking" coil, that creates the large and narrow back-EMF spikes (up to 5-600V and 60ns wide!), must have a relative high resonance frequency I think. The best solution fot that is a short coil with large diamater, large cross section (-> low resistance) and some space bw. the turns (-> low capacitance).

The resonant coil is made of isolated litz wire to reduce resistance at high frequency (skin-effect). The resonant frequency is about 29.2 kHz with 220nF capacitor.

The value of the resonant capacitor determines how much energy can be maximal stored at a certain voltage level (E=1/2*C*U²). If this energy level is reached (or at least about 90% of it), the energy stored in this cap can be extracted to the consumer. As you see in the picture, the first about 10 period has a relative steep slope, after that will be flatten so we will not have any benefit farther.

The method could be to build an extractor circuit. If the capacitor voltage level achieves a definied value, a switch with hysteresis (perhaps a comparator with MOSFET, earlier used a spark gap) delivers the charges to another puffer capacitor. As this exchange completed (a definied minimum voltage attained), the switch closes and the process starts again and again.

I've made a rough measurement (see table). The values are taken from the stabilized oscillation phase, the input power (voltage, current) read from the PSU displays. Energy calculated with the time of the first 10 period (E=U*I*t). Capacitor energy calculated as wrote above. The efficiency is so about 70-80%. Another, more accurate measuremenst are needed...

[evostars]

So, I've made a new setup a some measurements. I use solenoid coils. The "kicking" coil, that creates the large and narrow back-EMF spikes (up to 5-600V and 60ns wide!), must have a relative high resonance frequency I think. The best solution fot that is a short coil with large diamater, large cross section (-> low resistance) and some space bw. the turns (-> low capacitance).

The resonant coil is made of isolated litz wire to reduce resistance at high frequency (skin-effect). The resonant frequency is about 29.2 kHz with 220nF capacitor.

The value of the resonant capacitor determines how much energy can be maximal stored at a certain voltage level (E=1/2*C*U²). If this energy level is reached (or at least about 90% of it), the energy stored in this cap can be extracted to the consumer. As you see in the picture, the first about 10 period has a relative steep slope, after that will be flatten so we will not have any benefit farther.

The method could be to build an extractor circuit. If the capacitor voltage level achieves a definied value, a switch with hysteresis (perhaps a comparator with MOSFET, earlier used a spark gap) delivers the charges to another puffer capacitor. As this exchange completed (a definied minimum voltage attained), the switch closes and the process starts again and again.

I've made a rough measurement (see table). The values are taken from the stabilized oscillation phase, the input power (voltage, current) read from the PSU displays. Energy calculated with the time of the first 10 period (E=U*I*t). Capacitor energy calculated as wrote above. The efficiency is so about 70-80%. Another, more accurate measuremenst are needed...

Great work fejleszto!

After taking some distance from the work, I gained insights:
since L1 isn't resonant but L3 and L2 are, it makes sense to loose couple L1.
I measured at what distance this worked best and came to 29mm, which is half of my center hole diameter (pancake bifilar).

Since we need both forms of induction (dielectric and magnetic) it makes sense to have 2 primary coils, for a single secondary.
That is why I am now working with L3 (secondary) in the middle of L2 (series resonant, impulsed) and L1 (pulsed, producing impulses).

So, L3 is in the middle, and close coupled to L2.
L3 is loose coupled (29mm) from L1.

In the back of my mind, the idea of tesla's "extra coil" still itches.
Do we need another 4th coil to step up the secondary (L3)?

[fejleszto]

Ivo! We must definitely achieve a more efficient system by generating the back-EMF pulse!!!
Your new circuit works very good, I built it too. BUT! It wastes a lot of energy unnecessarily!

A better solution would be a push-pull system, where the coil is between the PSU and the MOSfet, and NOT bw. MOSfet and GND! A relative large cap (10.000uF or similar) schould be near the coil on the PSU side. Following with a HF filter coil, blocking dionde and a current limiting resistor.

So (one side presented): PSU -> R=10Ohm -> HV-Diode -> L=10uH -> C=10.000uF (low-ESR, parallel) -> back-EMF coil -> MOSfet -> GND.

Benefits:
- The HV back-EMF pulse generated by the coil will not be fully wasted, but captured and stored in the large puffer capacitor.
- Hopefully, the duty cycle can be drastically reduced (open time of the MOSfet). We must only maintain a stable puffer cap voltage, not feeding the ground in the about 50% of the time.

Please think about!   

(the picture is only for illustration, don't contains all of the components I've mentioned and designed only for one power supply line)

[evostars]

Interresting idea's, please proceed and share the results.

For me the impulse is not wasted, the resonant energy is even more amplified when the impulse is not fully absorbed in the series resonant capacitor!

I am researching this effect of the impulses in the current of the coils. So I do not want to store them in a capacitor.

the impulse seems to induce the longitudinal component of the series resonant primary coil

What I intend to do next, is switch mosfets in series by using the isolated gate driver. this will give the ability to create much higher voltage impulses

a single radiant half bridge PCB can also be used to switch 2 mosfets in series, simultaneously. I made a new video that shows this idea
https://youtu.be/w9I88HYY_Z4

and intend to use 4x 1700V mosfets (2x 2 in series) to create 3400V impulses (2x 4x 1000V blocking diodes).

For me the magic is in the effect of the impulse on the impedance of the resonant system.