Experimentonomen
- Joined Feb 16, 2011
- 331
The neon john circuit is a so called LCLR parallel resonant tank with a series impedance matching inductor.
When you increase the frequency, you get closer to resonance, which increases the current in the inverter, if your mosfets are undersized, they will pop as the current exceeds their ratings.
If you increase frequency even further, current should drop off again
Heres a video from my project using four IRFP450, two parallel pairs: http://www.youtube.com/watch?v=DpOcGPsennU at 1:36.
Here i have a peak detector with a current transformer showing the peak inverter current: http://www.youtube.com/watch?v=jiRwKpmBGqw
The analog meter shows the current beeing drawn from the mains.
When you increase the frequency, you get closer to resonance, which increases the current in the inverter, if your mosfets are undersized, they will pop as the current exceeds their ratings.
If you increase frequency even further, current should drop off again
Heres a video from my project using four IRFP450, two parallel pairs: http://www.youtube.com/watch?v=DpOcGPsennU at 1:36.
Here i have a peak detector with a current transformer showing the peak inverter current: http://www.youtube.com/watch?v=jiRwKpmBGqw
The analog meter shows the current beeing drawn from the mains.