Solid State HV
Inspired by the Steve Ward I thought Id have a go at making a large HV Switch mode PSU.
I measured the inductances of the windings and got a figure of 0.26mH for the primary and just under 1H for the secondary. Shorting out the secondary I got a leakage inductance figure of 0.042mH.
Aiming for a resonant frequency of
100khz I chose a 0.1uF cap, the allows me to run the coil in SLC at 1/2
fres or 50Khz.
The Power supply consists of a full bridge of IRG4PC30KD and a GDT driven by 2 IXYDD414's and a SG3525 controller. The bridge has full rectified mains (315Vac) via a variac for testing.
The picture shows the test set up
with an additional 0.2mH of external inductance and my first GDT, which I
later found to be wound on a really poor core taking out 2x
IXYDD414's in the process.
After A little playing I get the SMPSU
stable and played with a Jacobs ladder as a test load. The current
regulation is excellent, as the arc widens the PSU puts more and more power
into it. So far I have had up to 1.5KW into a silent hot white
Now to find a real use for this supply.