Eldarion and Bruce's build of Bob's Energy Converter

[eldarion]

Well, I just finished design and construction of the $20 bias supply!  It provides 150-200V from a 13.8V source, depending on load.  Plus, it only draws about 5 watts!

I have rescaled the meter in the picture to read in volts x10.  As you probably have guessed by now, I am a bit crazy about metering and instrumentation--if something goes wrong, I want to know exactly where with a glance, not have to spend the next 30 minutes probing around with a multimeter...

Eldarion

Eldarion,

Nice work man, would you mind drawing up a little schematic for us of your bias supply?

Thanks

Sure!  Here you are...

[MeggerMan]

Hi Eldarion,
I have 3 x ali cases for the dds 20 boards I have built.
Hammond 1455 series
http://www.hammondmfg.com/pdf/1455L1601.pdf
Like you, I have been wondering how to get the electronics into the centre of the TPU.
I hope to put two cases back-to-back and the mosfet driver and mosfets under that.
I will need to extend the controls using some clear tubing and chop sticks or something to press the buttons.
Also using a really big 15" TPU may help things.
Regards
Rob

[eldarion]

Also using a really big 15" TPU may help things.

Yeah, I think with the amount of circuitry I have here that may be the only thing that can help!

Here is a pic of the finished TPU, all hooked up but for the collector to its load.  I still have to figure out a way to limit the current drawn by the magnetic bias coils, as when I hook them up to the battery on the right (all in series), the jumper leads get extremely hot in a few seconds.  Given that there is only 0.29 ohms of resistance in those coils, I am probably drawing nearly 41.3 amps (410 watts)!!!  That is a surefire way to not get overunity performance!

Any thoughts?

P.S. I won't be firing this up tonight; I'll save that for tomorrow when I have a clearer head.  Given that there is almost 150V floating around in this thing, I am liable to get zapped.

Eldarion

[Bob Boyce]

@Eldarion

You should only need a few hundred milliamps at most on that magnetic bias winding. You can use a simple PWM to drop the current . You really want the ability to dial the strength of that magnetic bias anyways.

Bob

[eldarion]

@Eldarion

You should only need a few hundred milliamps at most on that magnetic bias winding. You can use a simple PWM to drop the current . You really want the ability to dial the strength of that magnetic bias anyways.

Bob

Bob,

Thanks for the PWM idea; I had not thought of that.  I will stick another MOSFET on my driver board for variable bias control, since I have to re-do the high voltage bias anyway.

I take it the magnetic bias can be pretty weak, and it does not have to be steady on, i.e. it can (should?) be pulsed?

Eldarion