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Dual Resonant Solid State Tesla coils (DRSSTC) / OneTesla Clone ** Urgent help needed!!
« on: February 06, 2019, 02:19:10 PM »
Hi Guys,
We are a team of engineering students, working on power electronics, and chose Tesla Coil DRSSTC as a graduation project, and decided to do a design similar to oneTesla (the first design with acrylic box, not the oneTesla TS), so and after many trials, we failed to find any PBC design for the kit, and decided to purchase the electroic PCB of the shelf, and build our coils on our own.
-----------------------------------
After having a secondary wind up, 3 inch PVC pipe, of 25cm of 0.15mm copper wire, with 5*20 cm toroid topload, the resonance frequency turned to be 290Khz (the design was suggested by some coiler).
-----------------------------------
For the primary, I made a flat coil, I used 2.5 mm solid copper wire 3.5 turns with 2mm spacing, which turned to be at 291Khz of resonance.
-----------------------------------
The Resonance for each is determined by scope-generator method, and each frequency for primary and secondary is determined separately.
-----------------------------------
For the interrupter I used also a ready made board, which fiber optic cable
------------------------------------
The Board mainly came with half bridge of 2 IGBTS of G4PC50UD, and after they fried I changed to use 2 40N60's.
------------------------------------
At my first operation ever (no tuning), I had a light pulp flashing as the interrupter fires, but no sparks at all, and the state remained like so forever, later on , and after tuning, I get this:
at 55VAC the pulp flashes, but tiny sparks (less than 0.5 CM).
at 110VAC the pulp flashes, but little bigger sparks (1 CM) drawn by a screw driver.
at 220VAC (15 A) the board dies and a short circuit happens on the supply rails , then I have to change the IGBTs!!!
We are fairly new to tesla coils, we haven't done any math, and we don't know where to start debugging or what mistake we could probably do, we tried watching Mads video, Mads guide, Steve's guide, and many other readings, but we still don't know where to start fixing the problem , or what is really going on here !
Any advice? we are close to the deadline, yet we are totally lost.
We are a team of engineering students, working on power electronics, and chose Tesla Coil DRSSTC as a graduation project, and decided to do a design similar to oneTesla (the first design with acrylic box, not the oneTesla TS), so and after many trials, we failed to find any PBC design for the kit, and decided to purchase the electroic PCB of the shelf, and build our coils on our own.
-----------------------------------
After having a secondary wind up, 3 inch PVC pipe, of 25cm of 0.15mm copper wire, with 5*20 cm toroid topload, the resonance frequency turned to be 290Khz (the design was suggested by some coiler).
-----------------------------------
For the primary, I made a flat coil, I used 2.5 mm solid copper wire 3.5 turns with 2mm spacing, which turned to be at 291Khz of resonance.
-----------------------------------
The Resonance for each is determined by scope-generator method, and each frequency for primary and secondary is determined separately.
-----------------------------------
For the interrupter I used also a ready made board, which fiber optic cable
------------------------------------
The Board mainly came with half bridge of 2 IGBTS of G4PC50UD, and after they fried I changed to use 2 40N60's.
------------------------------------
At my first operation ever (no tuning), I had a light pulp flashing as the interrupter fires, but no sparks at all, and the state remained like so forever, later on , and after tuning, I get this:
at 55VAC the pulp flashes, but tiny sparks (less than 0.5 CM).
at 110VAC the pulp flashes, but little bigger sparks (1 CM) drawn by a screw driver.
at 220VAC (15 A) the board dies and a short circuit happens on the supply rails , then I have to change the IGBTs!!!
We are fairly new to tesla coils, we haven't done any math, and we don't know where to start debugging or what mistake we could probably do, we tried watching Mads video, Mads guide, Steve's guide, and many other readings, but we still don't know where to start fixing the problem , or what is really going on here !
Any advice? we are close to the deadline, yet we are totally lost.
