Half Bridge with powerful IGBT transistors
is suitable for many different experiments or as a basis for different devices. You can build
eg switching high voltage power supply for a large Tesla coil, Big
Jacob's Ladder, an electronic supply for
halogen lamps, power induction heating, VLF transmitter,
SSTC driver, the source for laser and much more using this halfbridfe.
In my halfbridge IGBT transistors are IRG4PC50W that
are rated for a maximum continuous current of 27A and 220A peak and 600V.
This supply is working at about 20 - 25kHz.
(Due to surface phenomena, switching losses and dispersion performance vn frequency transformers would not be too high, not to mention
of radiation and capacitive currents).
Driver transistors is similar to the source induction heating.
By connecting two high voltage pulse transformers to the supply
I got a very powerful high voltage source. Transformers are wound
on ferrite cores EE without air gaps with dimensions of 12x19mm center pillar (from the old TV).
The primary windings have 28turns RF cable diameter of 1.5 mm and secondary are wound using
wire: 0.3 mm and have 400 turns. To make output
voltage soft (for experiments with arcs, Tesla coil after adding multiplier ...)
an inductor is connected in series. It has 30 turns 2 mm diameter wire on ferrite core
EE 8x10mm, the air gap regulates the output current.
In my case there is a gap of about 10 mm. Number of turns can be
slightly reduced, if you do not need current control almost from zero.
Transistors are obviously mounted on the heat sink.
My Half Bridge
is built into the box from the ATX. Fan also comes
from this smps. The heat sink is not too big, so I left the original
fan and added it to the small supply of 14.5 V, which also supplies
the driver. This supply is not in the schematic, but perhaps everyone can build his own or use a ready one.
