lavacapsule

https://i.postimg.cc/BvSBV9H5/Egzoset-s-2021-Waterless-Scenario-2021-Jan-3-360x400.png

2 separate Flux Concentration Paths & their associated Multilevel Class-D power chips...

That's essentially a Linux-compatible quad-core 64-bits 1.8 GHz computer in a keyboard with WiFi/BT5, GigaBit EtherNet, USB2 + USB3, USB-C PSUnit, micro-HDMi (2x), 16 GB micro-SD Flash drive for preinstalled Raspberry Pi OS, externally-accessible 40-pins General Purpose i/o (GPiO) extension port...

There's 2 ways to connect toroïd coils (so the final circuit will pass D.C. while attenuating A.C.) depending on how its windings were performed, plus 2 more if only a simple inductor will do; a 3rd type of setup removes the whole notion of magnetic poles and hence a need to pair them: go bifilar!

Schematized principle to communicate some basics.

Importing my RF Choke idea to a simplified 1-Phase 2 Poles version, in order to help reduce the parts count... N.B.: Such thin space between the poles would strongly suggests some tape-shaped susceptor.

A loaded concept implementing double-functions...

Egzoset's Universal 2-Phase 4-Poles IH WorkCoils Assembly - 16 mm Aperture - PCBoard Placement of Ti TPA3255 (up to 4 chips) Or... How much is too much??! ...

Power density ain't a pressing concern anymore, obviously. Each of the 2 chips is rated 300 + 300 Watts if hard-wired for "mono" audio, e.g. possibly the 20 Hz to 48 KHz range since Hi-Fi "Digital Audio" is also covered... Mono only requires 1 "RF Choke" per twin-coils duo (or phase)...

Using a pair of ST Micro TDA7498 chips the total admissible output power should in principle reach up to 400 Watts and yet even leave free PCBoard space for additional/optional electronics, if necessary...

Dated (2020-Oct-5).

Evaluated dimensions: 5 x 5 x 1 cm, with 5/8" (dia.) IH Aperture.

Multi-Mode (Universal) IH WorkCoil(s) assembly concept.

Much like the filename says, except for my particular use there can't be any obstruction in the center. See next picture post to gather why...

Solving a tricky 3-D IH problem using ancient Greece knowledge...

That's about the parts count for a "Half-Bridge" power stage feeding some yet-to-define 3-Phase stepper-like IH WorkLoad, properly compensated by using 3 RC "Snubber" circuits (as an EMi-wise addition).

Actually this present post continues a topic initially illustrated 5 years ago, it's about evaluating available space for more eventual IH WorkCoil components but not only: https://www.autoflower.net/forums/media/lavawand-capsule-mating-joint.323/ LavaWand Capsule - Mating Joint (2015-May-14)

It's about straight cylindrical "air-core" selenoïds and their implicit impossibility to "close" the magnetic circuit between 2 ends or poles which in stepper motors are forced to face each other in order to maximize mechanical torque, thanks to flux-concentrating material, etc.

Dated 2020-Jul-25. A quick retrospective on progress made investigating IH-drivers so far.

Dated 2011-Nov-16.