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Registered Member #5528
Joined: Sat Jun 30 2012, 06:53AM
Location:
Posts: 14
Sorry! :( I forgot!
Here it is. The 100R and 2pF at the secondary side simulate the intrinsic resistance and parasitic capacitance of the secondary in the simulator (these values are guesswork, I don't know the parasitics of the real coil.)
Edit: Picture removed. Reason: First post now has all the circuits.
In place of IRFP460A and MUR160 I am using IRFP240 and UF3003.
Registered Member #5528
Joined: Sat Jun 30 2012, 06:53AM
Location:
Posts: 14
hi jdub.
Try reversing the primary connection. If that doesn't work then increase the 15K resistor to 100K. Also try to use duty cycle of 10% or lower with interrupter. Lower D/C increases spark length and keeps MOSFET cool. What is your power supply voltage and how many turns are the primary and the secondary have?
Registered Member #5528
Joined: Sat Jun 30 2012, 06:53AM
Location:
Posts: 14
I have updated the setup. Spark length increased to 3" with 40VAC quadrupled to 160VDC supply. MOSFET is still cool but the sparks are now even hotter!
Registered Member #55219
Joined: Tue Jun 09 2015, 11:21PM
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Posts: 80
Shaan wrote ...
hi jdub.
Try reversing the primary connection. If that doesn't work then increase the 15K resistor to 100K. Also try to use duty cycle of 10% or lower with interrupter. Lower D/C increases spark length and keeps MOSFET cool. What is your power supply voltage and how many turns are the primary and the secondary have?
Turned out to be a bad diode.. I have it working now.. I blew a couple of the smaller gate transistors so upgraded to a TIP29, but overall it's working well. On your interrupter, are you toggling the 90v via mosfet? I haven't been able to get that part working, so I run continuous at the moment.
Registered Member #55219
Joined: Tue Jun 09 2015, 11:21PM
Location:
Posts: 80
As far as my coil, it is tiny, 1 1/2"dia, 680 turns, using a flat coaxial cable spiral primary 8 turns. My supply is a 75va 22v xfmr from a tankless waterheater with a full wave quadrupler for 70vdc.
Though I'm tempted to hook up some rectified mains for 160vdc and see how it goes.. All my parts were free so no "loss" there really..
Just trying to get the circuitry down before I build a "real" coil.. I'm thinking 6" x 20" #28/30
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My One MOSFET Driverless Tesla Coil with 555 Interrupter
