FIGUERA'S AETHER MAGNETIC FIELDS LINEAR PUMP, REVIVED

[lfarrand]

@lfarrand

Your post have been moved to: https://overunitymachines.com/index.php/topic,106.new.html#new

Along with @Classic question

This post will be removed as soon as you select a "like", meaning you read it.

Thanks

Ufopolitics

[kampen]

Reply to Message: #439
Today at 04:26 AM

@ Ifarrand,

Super helpful infographic—and we are very close.

A few critical tweaks then it is rock-solid for our SS-Linear driver:
Yes to isolated DC/DC per BPS leg (two per coil).
Do not run the MOSFET gate at +20 V. Cap the ON level at +12...15 V and the OFF level at 0 to –2/–3 V (not –5 V).
If your converter really gives +20/–5, regulate/clamp it before the gate driver, or use a +15/(–5) or +15-only part instead.

Concept is correct but Adjustments needed:
Do not deliver +20 V to the gate/driver → regulate to +15 V.
Limit negative bias to –2...–3 V (not –5 V).
Add G–S 15 V clamp and (optional) –3 V clamp.

[lfarrand]

Reply to Message: #439
Today at 04:26 AM

@ Ifarrand,

Super helpful infographic—and we are very close.

A few critical tweaks then it is rock-solid for our SS-Linear driver:
Yes to isolated DC/DC per BPS leg (two per coil).
Do not run the MOSFET gate at +20 V. Cap the ON level at +12...15 V and the OFF level at 0 to –2/–3 V (not –5 V).
If your converter really gives +20/–5, regulate/clamp it before the gate driver, or use a +15/(–5) or +15-only part instead.

Concept is correct but Adjustments needed:
Do not deliver +20 V to the gate/driver → regulate to +15 V.
Limit negative bias to –2...–3 V (not –5 V).
Add G–S 15 V clamp and (optional) –3 V clamp.

I can replace the Recom R12P22005D (+20V/-5V) with a Recom R12P21503D (+15V/-3V). How does that sound?

[lfarrand]

@kampen I just wanted to clarify something from the email you just sent me.

In it you mentioned this:

Per coil: 2 channels (Top Tᵢ + Bottom Bᵢ)
For 13 coils: Need 26 AC-switch channels TOTAL

Which topology are you aiming for? Ignore the fact that there are 14 coils in the pictures below, I know in your message you mentioned 13, but it's not important as far as the examples below are concerned.

What I expected was this:

where you have 14 coils and 14 switches - one for the negative side of the first 7 coils and one for the positive side of the remaining 7 coils.

But your email seems to suggest that you have the following:

where you have 14 coils and 28 switches, one switch for the positive and negative side of each coil.

If you proceed with the second topology and are opening the switches on both sides of the coil at the same time, then won't you be destroying the magnetic field that has built up around that coil?

In my mind the first topology looks the best, since the magnetic field will be sweeping over the coils from left to right and back again. With the make-before-break arrangement the magnetic field wouldn't be destroyed as it moves along.

[kampen]

@ Ifarrand,

Here is my answer.
Which topology are we aiming for?

Topology #2  because each coil has a floating "AC-switch" on both terminals.
Two MOSFET legs per coil, each leg is a back-to-back N-MOSFET pair with its own isolated gate supply and driver.

  Bus+ ──[ AC-Switch Ti ]── Coil i ──[ AC-Switch Bi ]── Bus−
                (leg 1)                        (leg 2)

Parts count (so you can plan)
For 13 coils with topology #2:

• AC-switch legs: 2 per coil → 26 legs total.
• Isolated DC-DC converters: 1 per leg → 26 converters.
• Isolated gate drivers: 1 per leg → 26 drivers.

(For the earlier 14-coil example, simply 28 legs / 28 converters / 28 drivers.)

Final line:

• We are intentionally using Topology #2.
• The magnetic field does not get destroyed during the sweep, because we use Make-Before-Break so current always has a path into the next coil.
• Snubbers and surge absorbers are there only as a safety backstop if a coil is ever opened accidentally.