I'm working on this coil for a while now. Now I reached a point where it's almost finished.
I used Steves UD3 driver with small modifications and made a huge code rewrite. The CPU of this driver is a Psoc5LP Cortex-M3 micro, which has a on board FPGA.
The software consists of a FreeRTOS operating system and a bunch of tasks which handles all the control functions. The interrupter is a piece of software inside the driver. I worked a lot to get the software as user friendly as possible. The PC-Interface connects via USB to the PC and enumerates as USB-Midi and USB-Serial Port. You can connect to the serial port with a vt100 terminal and the driver offers you a CLI with autocomplete, history and help functions.

github repo and Wiki: https://github.com/Netzpfuscher/UD3/wiki



The driver can sweep through a given frequency range and plot the response of the primary and secondary for easy tuning.

Primary:

Secondary:


Interface:


The driver samples the maximum primary current an displays it in the status window (Youtube Video). It measures the Voltage on the bus and the current to the bus to calculate the rms current and the power.


The driver board:


The complete coil:


The inverter box:



To handle the peak powers I build a buck converter to reduce the 3 phase mains voltage (565V in Germany) to 400V which is the maximum voltage of the capacitors at the moment. The buck is calculated for 10kW continuous power and waits for a enclosure 



At the moment I'm working on a new PCB which includes the secondary current circuit and a small fix at the USB-Port.


I would put the complete code and the PCB-Design files on GitHub if I get the permission from Steve (90% of the PCB, the Logic in the FPGA and a little bit of software which I haven't rewritten is his work)