Pierre's 170W in 1600W out Looped Very impressive Build continued & moderated

[T-1000]

You can control the power of the H bridge through PWM. Do you have other reasons ?

The answer is in where the strongest position of each magnet pole is when you introduce paralel same pole magnets. With single magnet it is middle of the magnet diameter. With 2 magnets is on junction position between magnets. Same happen with coils. As soon you do that there is "movement" of magnetic pole. And if you point magnetic pole towards core of the coil it is not same when magnetic pole is matching middle of the coil core and where it "moves" a bit the the side. With air core coils it is also same relative position to the coil wire. If the magnetic field movement happen to cross wire and also is in middle of change polarity from one to another there is induction in the wire. This is required for power generation.
If you just weaken or strengthen the magnetic field density in PWM the resulting change of flux is like in any transformer only.

[konehead]

Hi all
From my experience rotating permanent magnets sweeping past  coils show very strong magnetic force at the leading edge ( front) and at the magnets trailing edge ( back)
This is where the power is ....at the edges of the magnet.
Also there is no power produced at all if the coil does not have resistive load....and now Lenz law appears too, and it now might take 8 or 10 times more power to be rotating the magnet past than what the coil produces in power...depends on the resistive load a lot. And Airgap and magnet strength size and speed of rotation decide how bad Lenz law braking effect will be.
One way to prevent Lenz law is don't apply direct resistive load to coils instead fill caps-only then have 2nd stage where only caps hit the load for power. Cap size and resistance of load important plus frequency and speed of filling and discharging caps is important
Another way to prevent Lenz law is to not rotate the permanent magnets but rotate a field of electromagnets which is the dz generator more or less.
Hope.some.of this helps a little bit in thinking DZ generator how it works how to simulate sweeping permanent magnets electronically.
One other thing it is possible to chop narrow pulses of the generator coils and fill caps at sinewave peaks
....why fill caps at sinewave decension period... caps will not fill up anymore than what is at peak...
Also the coil can be briefly shorted at peak with fwbr ac side across coil and  the dc side of fwbr filling caps....now caps fill much faster and will go x20 or x50 more voltage
...release caps to load by themselves in two stage type output

[pmgr]

No I think are several methods to accomplish this. You may be able to use the bridge enable lines .I was thinking of a single switch between the cap bank and the boards. The supply caps on each board acting as a filter with external diodes recovering to the cap bank. Needs some thought.
Isolate the switch with diode to ensure no recovery back through the MOSFET body diode.

L192

You can use two additional discreet MOSFETs (one on high side input and one on low side ground connection) with the body diode in reverse direction. So on high side the drain of one of these FETs would be connected to all the drains (Vdd inputs) of the high side H-bridges. On the low side the source of the other FET would be connected to all the sources of the low side H-bridges (GND/sense connection). In that way you have two body diodes in reverse all the time which will prevent any recovery through the body diodes.

PmgR

[listener192]

You can use two additional discreet MOSFETs (one on high side input and one on low side ground connection) with the body diode in reverse direction. So on high side the drain of one of these FETs would be connected to all the drains (Vdd inputs) of the high side H-bridges. On the low side the source of the other FET would be connected to all the sources of the low side H-bridges (GND/sense connection). In that way you have two body diodes in reverse all the time which will prevent any recovery through the body diodes.

PmgR

Yes that would work.


Generally.. everybody has different ideas but they should address the fact that Pierre produced a 60Hz sine. He did not do this by switching relays at a high rate as we know this is not possible, so think on how did he accomplish this. I have suggested one way so can anybody think of another?


L192

[pmgr]

Another way to get to 60Hz:

Pierre's switching frequency of each relay is about 3.75Hz. Consider mixing this signal with itself, it will generate sum and difference frequencies, or 0Hz (DC) and 7.5Hz. Repeat this and eventually you get up to 60Hz: 7.5Hz signal mixed with itself gives 15Hz signal, mix that with itself and it will give 30Hz, mix that with itself and it will give 60Hz (16th harmonic of 3.75Hz)

Now you are thinking what is doing the mixing? Well, read this link:

https://www.allaboutcircuits.com/technical-articles/how-to-multiply-RF-signals-without-a-multiplier-the-switching-mixer/

and you will find out that the switches (and all their harmonics) are doing the mixing.

PmgR