Tesla (Tower) Wireless Power Transfer

[eneuro]

H-bridge handmade (before sending to manufacture) prototype PCBs assembled using four TO-220 500V 8A IRF840  and we are ready to drive those nice mosfets using GDTs driven by ZVS driver



We'll see what happends in this another WPT attempt-short GDT outputs will be soldered directly to those mofets gates protected additionally by 12Vz zeners and resistor between gate and source.

When manufactured PCBs comes, more mosfets can be put in paralell to achieve higher input power when needed-for the moment just proof of concept 

Probably middle of the night will be good time to test this WPT device since lower chance to interfere with TV receivers stuff, etc 

[akis]

Effects of long term exposure to microwaves and cell-phones have yet be studied.
Only since a few years people carry a cell phone 24/7.

Hours in their pocket near heart and lungs or pocket closer to the reproduction organs.
Hours on the bedside near their head.

Since microwaves at this scale are not naturally occurring this should be treated as if it poses at least some threat to human health.

Never before in the history of human kind have our bodies been exposed to so much radiation as with cellphones at 1W and 2W at a few mm from the brain for such long durations. The frequencies are beytween 900Mhz and 2700MHz. The "cooking" frequency of microwave ovens is 2400MHz which happens to be the WiFi band, and the Bluetooth band...

[eneuro]

Assembled quite nice 230VAC one stage H-bridge -easy to scale up to as many mosfets in parallel as we want 



Rivets will be used in final assembly to mount TO-220 mosfets to PCB with heatsinks inside 

[alsetalokin4017]

Single mosfet (IRFP260n) SSTC, PLL (CD4046BE) driver, discrete gate driver (2n7000, 2n2222a), Pulse Modulated (555), input 30 VDC:

[alsetalokin4017]

@eneuro: Rivets not recommended....   

[SeanB]

Rivets fine so long as they are the right type. I was at the scrapyard and saw an APC UPS in pieces, so took the power stage. Interesting that they used what looks like a blind rivet, but it is actually a self threading screw with a Torx drive, used to hold the power devices down to the PCB. No insulator kit, they used separate heatsinks for each half bridge driver and multiple mosfets on the sheets, with these screws holding them and the faston wire connectors to the aluminium alloy sheets.

[eneuro]

No insulator kit, they used separate heatsinks for each half bridge driver and multiple mosfets on the sheets, with these screws holding them and the faston wire connectors to the aluminium alloy sheets.

I don't like insulators between mosfet tap and heatsink, so four bulky conductive bars in the edges with attached heatsinks should be fine 



Copper connection angle between PCB and mosfet TO-220 tap holded by rivets , so we have copper heatsink to copper mosfet tap connection-additionally copper pipes can be instaled in the edge of the connector angle, connected with silicone serpent to be able  pump mineral oil to cool down everything 

This is what will be used as three phase H-bridge in my another more powerfull EV (electric vehicle design) with Hall effect sensors based synchronous rectifier driver to be able use the same H-bridge mosfets during regenerative breaking to store energy in.. quite bulky flywheel based energy storage system

Those PCBs needs only small changes to better fit THT TO-220 mosfets source and gate, since its drain pin  is... yep... completely removed and its tap used instead 

[eneuro]

Nature likes symetry, that is why this GDT was made this way



We'll try connect this GDT wires to mosfets gates and sources to create galvanic insulated VGS using 12V car starter battery and ZVS driver as input power to this GDT 

Synchronisation of top & bottom mosfets in this H-bridge will be performed using proper wires connections in each of four GDT windings.

H-bridge input current will be limited and circuit protected with a few amps fuse to ensure no blackout in home mains grid happends during those WPT eperiments

[eneuro]

Will this galvanic insulated GDT mosfets gate drivers work in this H-bridge 230VAC ?



Anyway, soldered mosfets gate-source GDT outputs and now more difficult part to connect in proper way GDT input wires to manage to work with ZVS split transformer (GDT) primary 
Probably I will make small PCB for this to ensure no mistakes will be made which could ruin work with proper soldering of mosfet gate GDT outputs which is critical to make this thing to work, but I didn't test it in circuit simulator so there is some fun if it will work at first try 
Quite nice symetry helps to ensure no mistakes were made so far -I hope 

[eneuro]

Finally managed this shared GDT H-bridge driver to solder ZVS driver split primary transformer (GDT) connectors 

Ready to connect to my custom made ZVS driver powered from 12VDC  car starter battery



Due to slightly different magnetic flux coupling of those four GDT windings on ferrite core, it could be difficult simulate this in circuit simulator, so it will be easier test this thing and try drive those 230VAC H-bridge using ZVS driver.
However,maybe I will need exchange gates polarity to ensure higher turn off currents (faster turn off) than turm on, due to mentioned probably slightly different magnetic coupling between right top left bottom and left top right bottom mosfets, while this GDT was designed for ZVS driver.

This concept now is real circuit ready for testing-I didn't used any scope so far, so it could be fun if it worked from a first try just based on theoretical work and calculations 

I really want challenge u  Beam in wireless energy transfers and we'll see what we get .... without any IC so far -just a few mosfets and discrete components