'Biefeld-Brown effect' based full range drivers - Page 33

bobo1on1 · 31st December 2006, 02:20 PM

I just did a small test with a ccfl inverter, there was no corona discharge even at 0,5 mm spacing, so I guess the voltage was too low.

I guess I need to use a tv line transformer.

Nixie · 1st January 2007, 03:06 AM

I get good performance by extracting the core of a TV flyback, rewinding it for whatever voltage, and then driving with a full bridge. That way you are not limited to the operating parameters of the original flyback circuit. You can get 100-200 W depending on core size and frequency.

bobo1on1 · 2nd January 2007, 12:27 PM

I was thinking about driving it single ended and using a transistor circuit to detect when the protection diode is conducting and when the inductive surge starts and stops.

I can detect that signal with a microcontroller so I can drive the transformer with an asymmetric signal to get the maximum possible duty cycle at the output while preventing excessive currents through the primary.

I don't know if it actually works though.

Nixie · 1st February 2007, 06:23 PM

Quote:

Originally posted by Nixie
Use www.pat2pdf.com to get a PDF version of the patent.

Oops, it's www.pat2pdf.org, not .com...

Which makes me wonder if anyone actually looked at it, since they didn't call out my error.

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31st December 2006, 02:20 PM	#321
bobo1on1 diyAudio Member Join Date: Dec 2003 Location: Tulips, windmills and wooden shoes.	I just did a small test with a ccfl inverter, there was no corona discharge even at 0,5 mm spacing, so I guess the voltage was too low. I guess I need to use a tv line transformer.

1st January 2007, 03:06 AM	#322
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	I get good performance by extracting the core of a TV flyback, rewinding it for whatever voltage, and then driving with a full bridge. That way you are not limited to the operating parameters of the original flyback circuit. You can get 100-200 W depending on core size and frequency.

2nd January 2007, 12:27 PM	#323
bobo1on1 diyAudio Member Join Date: Dec 2003 Location: Tulips, windmills and wooden shoes.	I was thinking about driving it single ended and using a transistor circuit to detect when the protection diode is conducting and when the inductive surge starts and stops. I can detect that signal with a microcontroller so I can drive the transformer with an asymmetric signal to get the maximum possible duty cycle at the output while preventing excessive currents through the primary. I don't know if it actually works though.

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