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

[Rich SAS]

eldarion, and all, well first time, didn't take, so hope it all works this time. First Picture is the three phase pwm, 1200 volt 400 amp IGBT bricks. Scope shot of the 10.7 khz primary, voltage peak is at 1kv taken with a 100x probe, 100 volts per div.. Primary drive voltage and current are 50 volts dc at 500 ma, apox. 25 watts. Lamp is 75 watt 120 volt. Picture of the germanium LEM detector running. Any more questions, feel free to ask, as I am sure did not get everything. Oh ya that meter is not registering what you are thinking, its what i have available, needed the 50 micro amp movement for the LEM detector.

Rich

[Jdo300]

WOW! 

That second picture was of the primary waveform  I would never have anticipated that a waveform that noisy would produce good results! Now THAT is encouraging! That thing is ringing to high heaven! No wonder that filtering the ringing made it stop working before!

In that scope shot, were the other two primaries running along with the one shown? If so, could you take a scope shot of just the one channel running with the other two off?

God Bless,
Jason O

[eldarion]

LOL Yeah, light radiation  .

LOL!  Just wanted to make sure I wasn't giving myself a fatal dose of X-rays.

From the scope shot Rich posted (which is pretty close to what happens when I scope across my secondary) I would think that the primary ringing is actually desired, or at least does not detract from the effect badly enough to kill it.

I got to thinking--a stack of mostly charged 9-volts will have an impedance of about 600 ohms.  If I can decouple my HVDC supply from ground, I think the only remaining step would be to lower the output impedance of my supply, which right now is nearly infinite.  At that point I should start to see some interesting stuff--I hope!   (I think the infinite impedance, along with the short to Earth ground on one end of the secondary, is probably routing any longitudinal energy away from the load and also blocking it from reaching the load.)

Here's a picture of my setup so far:
http://www.falconir.com/pics/DSC02326.JPG

I have been working very hard to make everything compact, including the gate drive leads.  The secondary wires travel over the top of the coil off the right side of the picture.  There are also 1.5uF caps directly at the IGBTs to allow for short bursts of current at turn-on.

Eldarion

[Rich SAS]

Jason that is one primary channel only,, and you do want all the harmonics its generating, its hard to see but there is 1kv peak out there too, which is the pwm  on and off time. Forgot to mention my sec. bias voltage is a apox 74 vdc, and the battery's seem to be charging ,, after the run I did , battery's measured at 76 vdc after.

Rich

[eldarion]

Hi Rich,

Thank you for all the pictures and information!

I just have one more question: is that 75W bulb just barely lit, or is it lit fully and the camera is making it look dim?

Just tying to figure out the COP I should be expecting from this type of setup...

Thanks!

Eldarion