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Registered Member #5436
Joined: Sun Jun 24 2012, 01:44AM
Location:
Posts: 39
Hello,
This is my first post and I’ll get right down to business.
I originally used a copy of the Dr. Dark Current PWM plasma speaker, but I always had too much overshoot. Also, the output voltage from the MOSFET driver was too low to saturate the gates. So, I drew out the Tobias FM controller, with a TC4420 driver added. This then feeds the original Dr. Dark Current Half Bridge. Outputs 1+
2 connect to the GDT, with the original UCC chip bypassed. I used the TC because of a higher input voltage and higher heat dissipation.
• Are there any improvements to be made to my Frankenstein design? • The TC driver portion-What different MOSFET could I use? The original UCC driver used the IRF540, which I thought was overkill. • On my original plasma speaker, which was an exact replica of the hv-labs.xf.cz (Dark Current) design, I kept killing the MOSFETs due to kickback from the primary after shutdown. Is there anyway to properly design a snubber? The original 470pf+2.2k wasn’t really working. • I’ve been using telephone connector wire for my GDT. What would you recommend to use? Are there any advantages of a Inverted driver vs. Non-Inverted?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Hi, in my circuit there are the two diodes to clamp the inductive kick back and recycle it to the filter cap. Did you have the diodes in place and short wiring? What you describe should really not happen.
Or if you are referring to the "simple output stage", well there will always be spiking on the drain of the FET and heating of the transistor, the price you pay for a simple circuit. :P
PS. The output voltage from the gate driver is about the same, if there was a too low voltage on the gate then you had a too low supply for the driver, or a damaged component.
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Elementry FM Plasma Speaker Work
