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4hv.org :: Forums :: High Voltage
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My TSC International Ferrite Shipment. (1kVA Txfmr)

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Sulaiman
Sun May 15 2011, 08:06AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
I'd go for the UC384x family as more than half of the embedded smps that I encounter use one
there is a wealth of info. on the net, easy to get help.

Use good quality capacitors for your smps circuitry
as the most common smps failure that I come across is high esr or leaked electrolytics ...
designers frequently underestimate the stresses on and lifetime of electrolytic capacitors.
In order; ceramic, os-con then low-impedance high-temperature (105C or more) electrolytics.

P.S. volume efficiency (watts per cubic meter) is probably one of the least important aspects
normally it's
- watts per dollar, which includes watts per pcb area (profitability)
- efficiency (marketing)
- watts per kilogram (airborne etc.)
- second-sourcing (to ensure production)
- reliability (reputation)
- emc (statutory)
- safety (liabilities)
then maybe volume efficiency.
Maybe our resident smps designers could re-prioritize/add to the list.

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Patrick
Sun May 15 2011, 03:22PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Sulaiman wrote ...

P.S. volume efficiency (watts per cubic meter) is probably one of the least important aspects
normally it's

For a solid oxide fuel cell powered aircraft -- watts per Kg becomes really important.


1305472913 2431 FT113903 Helios In Flight
Battery/solar powered.


1305472913 2431 FT113903 Boeing Fuel Cell Demonstrator Ab1
Fuel Cell powered.
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Carl Pugh
Mon May 16 2011, 12:53AM
Carl Pugh Registered Member #1064 Joined: Tue Oct 16 2007, 05:04PM
Location:
Posts: 42
So you're going for EE Ph.D.
Good Luck

Just out of curiosity, what voltage and current would you like your 10 Megawatt transformer to input and output?

What are you going to do with a monster transformer like this?

Have you considered how you are going to test this transformer?

JPL used to use some transformers at about this KVA. They operated the transformers at 400 hertz and used a 60 hertz to 400 hertz motor generator to power the transformers. They varied the voltage to the generator field to vary the output voltage.
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Patrick
Mon May 16 2011, 03:25AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Carl Pugh wrote ...

So you're going for EE Ph.D.
Good Luck

Just out of curiosity, what voltage and current would you like your 10 Megawatt transformer to input and output?

What are you going to do with a monster transformer like this?

Have you considered how you are going to test this transformer?

JPL used to use some transformers at about this KVA. They operated the transformers at 400 hertz and used a 60 hertz to 400 hertz motor generator to power the transformers. They varied the voltage to the generator field to vary the output voltage.

I havent fully figured this out yet, but i plan to use 1000 modules per Megawatt. And i would build and test in stages, not all at once, it should be 800Kg, and cube 1.1 meters on each side.(i could be wrong about the math as thats an approximation.)

so once its made out of all its modules, then they can be tested individually, and then together. so that is how i would test it. CMC, paralellable, if one fails then the load shed upto 1.25kW continous for each module is meant to be survivable.

As for the voltage, that depends, the SOFC puts out 0.95-1.7 volts out of a maximum half reaction of 2.2V, so the number of plates matters. it may be several hundred volts input, several thousand out. obviously matching impedance from the battery/fuel cell, and the impedance to the motor is what the transformer is for.
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Ash Small
Mon May 16 2011, 10:26AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
This is beginning to sound feasible. according to my rough calculations, each module would be ~11 cm cubed, so, with liguid cooling, it seems quite plausible.

What kind of efficiency are you expecting? ie how much heating?
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Steve Conner
Mon May 16 2011, 11:18AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Here is a study that compares three designs for a 1MVA traction transformer as used in an electric train.

-Regular type
-400Hz with catenary side IGBT inverter
-High temperature superconducting

Link2

The 400Hz one wins, but I don't know if they took into account the weight and losses of the 50Hz to 400Hz inverter.
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Patrick
Mon May 16 2011, 03:19PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Look at the last few pages here: (pg 18 if your in a hurry)

]parallel_smps.pdf[/file]

You should read the whole thing, but i have always wondered about some of the points i see here in this article, well others had these problems too and found solutions! The diode and resistor master-slave concept in particular for aircraft redundancy, if a few modules fail the others reorganize and continue.
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