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Figure 1 shows that the large tpu is possibly a coil,the gap has a magnetic
field,indicating its a giant coil made to look like a giant torroid. Figure Red wire, shows that the red wire connects to one electrolytic capacitor,its hard to see if the caps are connected together however keep in mind
800 volts plus are placed on one cap.I used CHAT GPT to get an idea what electrolytic capacitors
you could get in 1998.Chat GPT was asked ,what value of electrolytic capacitors were available in 1998.
Practical upper limit (for that era)
Around 330–470 µF at 450 V was about the realistic ceiling for widely available catalog parts
Larger values existed but were:
Very bulky (large snap-in cans)
Expensive
Mostly used in industrial or specialized equipment
What you wouldn’t typically see in 1998
450 V parts in the thousands of µF (like 1000 µF+) were essentially impractical with aluminum electrolytics at the time
Designers would instead:
Use multiple capacitors in parallel, or
Use different supply topologies
Typical real-world examples (1990s gear)
CRT monitor PSU: 100–220 µF / 400–450 V
ATX power supplies (late 90s): 200–330 µF / 200 V (doubled) or 120–220 µF / 400–450V
Audio amplifiers: 220–330 µF / 450 V (tube gear)
Bottom line:
In 1998, the practical, commonly available range for 450 V electrolytics was roughly:
10 µF to ~330 µF (with 470 µF at the high end but less common)
If you’re trying to match or replace a part from that era, staying within that range will reflect what designers realistically had on hand.
The working voltage was 450v,your applying 800v plus,way beyond the 450v,
the solution you connect two caps in series,then the working volts are 900vdc,
this is the reason for the 2 capacitors,there are also resistors across the caps to balance the
voltage,and discharge the caps when not in use.Fig possible output circuit
of tpu,in my opinion,the tpu coil forms a transformer,with an air core,and a 1:1 ratio when giant current pulses are generated in the primary,the energy is
transferred by induction to the secondary,then thru a diode that charges caps.
Figure CLF POWER shows that this system will work,I generated high current pulses fed them to a air core transformer and lite a CFL.
Figure magnetic field of torroid,shows that the field extends across the torroid.Figure animated gif shows magnetic field of torroid with iron powder and steel bbs.Why does the
torroids have white wires,in my opinion its to expose the wire to the
magnetic field.Figures white wire 1 and 2 show what works and what doesn't
work.There are other factors that need to be figured out before a replication
can be attempted.
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Topic: Reverse Engineering The Large TPU (Read 72707 times)
