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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Is it possible to make a single high voltage transistor out of something like a bunch of 2N5551BU transistors? About 20 kV is needing to be swithced, with lets say 30kV for a safety/reliability factor.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
I agree with Sulaiman, not practical on your scale.
One place where people run many HV semiconductor switches in series in high voltage DC power converter stations. For example, see and
"While in the early years about 84,000 devices rated at 0.9kA/1.65kV would have been necessary to build a 3,000 MW system, today the same amount of power can be transmitted using only 3,750 thyristors rated at 4kA/8kV."
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
DC->AC converters are a bit special since the Thyristors only need to be turned on, and they don't need to turn on fast ... with a non resonant circuit built with transistors you're not so lucky ...
The circuit I linked to in the other thread for an alternate GDT setup with two transformers seems the best circuit to switch MOSFETs with poor coupling (which hi-pot transformers tend to have) low mutual inductance (which fast rise time transformers tend to have) transformers. Two ferrite toroids (need to be big enough to get a couple of turns of bifilar HV insulated wire on), 1 Schottky diode, two resistors and 2 TVS per MOSFET ... pretty reasonable.
(As you see in the link, I just assumed something like this had to exist, googled for it ... and lo and behold.)
The problem with methods like optical isolation is that the gate drive then needs a floating power supply, which adds a lot more complexity per MOSFET.
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Is it possible to make an HV transistor...?
