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Messages - Bambinz
1
« on: January 16, 2022, 12:21:40 PM »
Thank you very much! Yes, of course it is necessary to minimze the parassitic inductance between the mosfet and the DC-Link Cap maybe by adding an MKP capacitor directly connected on the mosfet
2
« on: January 15, 2022, 06:31:33 PM »
Thank you very much for the tip! Probably will be better to use an half-bridge with a voltage doubler to keep it simple! In addition in the push-pull setup is more difficult to keep low parassitic inductance, that results in higher voltage spike. I will make some test and i will report the results
3
« on: January 13, 2022, 08:20:02 PM »
Some suggestion?
4
« on: December 30, 2021, 09:46:31 AM »
Hi all, I had a good experience with a small SSTC based on tefatronix's schematic (push-pull configuration driverless) where I obtain 7-8cm of spark with a 24V supply, now I would like to try to build a little bit bigger teslacoil to obtain spark near 20cm The main idea is to use a 440VA 53VAC trasformer that I have in laboratory. I would like to explore an alternative configuration respect the usual half/full brige. What do you think about a push-pull configuration with the mosfet drived by a couple of UCC37322/37321? In this way it is not necessary a GDT and than the feedback will be taken from secondary with a small transformer plus two schmitt inverter. In addition the push-pull configuration, like the full bridge "double" the voltage. The other advantage is that theoreticaly it is not necessary to bias the mosfet because the system will start "automatically". The coil will have a very low primary inductance to have an high peak current combinate to a low duty-cycle to have a low mean power and an high pulse power.
5
« on: May 09, 2020, 02:13:40 PM »
Amazing performance and costruction, probably the best QCW coil that I ever seen.
6
« on: May 09, 2020, 10:26:26 AM »
Hii, I have finished the schematics. What do you think? Can work? Thank you very much!
7
« on: April 29, 2020, 08:15:16 PM »
Hi all,
I would like to base the driver on the Steven Ward 1.3b. A little questions, in my case where I use a normal mosfet and not mosfet module/IGBT,is it necessary the STB16PF06 push-pull?
Thank you very much! Best regards Alessandro Vaghi
8
« on: April 29, 2020, 11:14:06 AM »
Thank you very much! I try to implement all and then I will post the schematics!
9
« on: April 28, 2020, 08:36:19 PM »
Ok, thank you very much!
But I don't understand why is usualy used primary feedback. I think that the resonance frequency of the secondary will change during the spark, therefore if I use the secondary feedback will be always in resonance. No?
10
« on: April 28, 2020, 04:08:50 PM »
Hi all, I would like to realize a little DRSSTC, the idea is to obtain longer spark from the SSTC that I have developed in the post in SSTC section.
I have two secondari coil: one with a resonance frequency arround 1MHz and the other probably in the range of 400kHz, but I can measure precisely the resonant frequency of the coil with the Analog Discovery 2.
I will supply the coil with a 30VAC 150VA transformer or 50VAC 500VA transformer that I have.
I am thinking a full bridge with IXFP76N15T2 mosfet.
The idea is to have the simplest possible drivers, now I am drawing the schematics.
A questions, I should use primari o secondary feedback or antenna feedback? The overcurrent detector is mandatory or not?
Thank you very much in advance for your time and help!
11
« on: April 24, 2020, 10:25:44 PM »
Instead of driving the mosfet with the feedback transformer, can I use a gate driver ic like the UCC27425?
I would like to try to do use this system: https://www.loneoceans.com/labs/sstc2/sstc2schematicv10.jpg but to drive the push-pull configuration. To reduce the number of components
You need the GDT (gate drive transformer) between your UCC driver and the MOSFETs for isolation between logic and power sections. If you want to omit the GDT, look into "high side mosfet drivers", but that is often more complex than a simple passive component like a GDT.
I want to use the Push-pull configurato, therefore the two mosfet is refered to ground. In this way I Can drive it with the ic, no? EDIT: I would like to increase the power of the mini SSTC. I have a transformer of 150VA 2x15V. I have think at two topology, half-bridge with voltage doubler like the loneoceans configuration to have +-42V on the inductor. Or a push-pull with a voltage doubler to have +-80V on the inductor. The advantage of the push-pull is that doesn't require the GDT and I will have higher voltage but the layout is more more critical. Which configuration is better for my application?
12
« on: April 18, 2020, 04:18:10 PM »
Hi all, The minitesla still working Now I would like to do a PCB to minimize the parasitic inductance! Instead of driving the mosfet with the feedback transformer, can I use a gate driver ic like the UCC27425? I would like to try to do use this system: https://www.loneoceans.com/labs/sstc2/sstc2schematicv10.jpg but to drive the push-pull configuration. To reduce the number of components In addition I have realized the configuration in the link with a bigger coil, but with a 50W transformer (24VAC 2A) I obtain only spark of about 3-4cm. Probably due to the low input power
13
« on: August 08, 2019, 01:15:11 PM »
1.5m of spark with an VTTC? It is Amazing! The most powerfull VTTC that I have ever seen!
Congratulation!
14
« on: August 08, 2019, 12:15:26 PM »
The thermal paste and the heatsink is not sufficient in some case, expecially when you use short pulse duration but with high current (low mean current). You should check also the thermal impedance.
15
« on: August 08, 2019, 11:58:47 AM »
I agree, and then if the inner caps fail the other caps fail consequently (avalanche effect).
16
« on: August 08, 2019, 11:56:51 AM »
I have just ordered the board from PCBWay for the driver. I hope that all works good xD In the next day I will post the complete schematic
17
« on: May 05, 2019, 08:11:25 PM »
very very good Have you tryed to drive it with a royer ZVS driver?
18
« on: May 05, 2019, 01:33:37 PM »
I would like to make some changes in the driver. I have found a 440VA 53VAC transformer that I would like to use for the next teslacoil.
Therefore VDC will be +- 75V (that can reach +-90 without load), therefore I have choosed a mosfet of 250Vds -> IRFB4229 With a very short and semplified thermal calculation, result that can handle about 55A with the interrupter set to 20Hz and duty-cycle of 5% (Setted as worst case).
I would like to have the same carachteristic of the small coil with an high peak current and a low duty-cycle to have an low mean power and an high pulse power.
Thereticaly the small teslacoil have an peak current of about 30A, with a 24V supply and a push-pull driver will results in a 30A*24V*2= 1440W (peak power) and an average power of 40W. The results is about 7-8cm of spark.
Therefore the average current will be about: 55A * 0.05 = 2.75A with an average power of 75V*2.75 = 206W. And a Peak power of about 75V*55A =4125W
Therefore we will have a 4x power therefore I will expect a sparklength in the range of 30cm. Can be correct?
19
« on: May 03, 2019, 07:52:19 PM »
This is the schematic of the half-bridge:
20
« on: May 03, 2019, 07:45:13 PM »
Very good! Geogebra is a good software. I have used it during the Bachelor for the mathematics and physics Why in the big teslacoil is used almost always a flat spiral for the primary? To maximixing the distance between the primary and the secondary and to not have a too high coupling?
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