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Messages - Bambinz

Pages: [1] 2
1
Vacuum tube Tesla coils / Re: "LightningStorm" VTTC project
« 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!

2
Dual Resonant Solid State Tesla coils / Re: Twin System Build
« 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.

3
Dual Resonant Solid State Tesla coils / Re: My second DRSSTC
« on: August 08, 2019, 11:58:47 AM »
I agree, and then if the inner caps fail the other caps fail consequently (avalanche effect).

4
Solid state Tesla coils / Re: [Development] Project of an SSTC driver.
« 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 :)

5
very very good :)
Have you tryed to drive it with a royer ZVS driver?   ;D

6
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?

7
This is the schematic of the half-bridge:

8
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?

9
Probably some small holes will not be a big problem because the surface of the IGBT is very large compared to the hole area.
The very important things is that the hole do not compromise the planarity of the heatsink, therefore a little countersink can be a good things.

10
Dual Resonant Solid State Tesla coils / Re: Phoenix's Large DRSSTC II
« on: April 30, 2019, 06:34:07 PM »
It is a very difficult project also for an Engineer, because handle an so high current/voltage is not obvious. Theoreticaly, probably, is not very complex but in practise there are many things to take care: Layout, Power dissipation, ...
Requires many experience in the field, I think that you have certainly build many DRSSTC in various size.

To reduce the thermal resistance, I know that in generaly, the heatsink is polished to have a perfect planarity to increas the contact area. In addition, you should respect the mounting torque to have the best possible contact.  ;D

11
Solid state Tesla coils / Re: [Development] Project of an SSTC driver.
« on: April 30, 2019, 06:22:36 PM »
Thank you very much for the indication. The software is fantastic!
I will try to adapt the software with my data.
Eventually, I will rebuild a simplified interface with python :)

12
Solid state Tesla coils / Re: [Development] Project of an SSTC driver.
« on: April 30, 2019, 12:48:21 PM »
Yes, I will read the switching frequency from the secondary current feedback, that will be also the driving signal for the driver.

In addition, I would try to implement a ZCS (Zero-current-switch) by reading the primary current and then by using a zero zero cross detector to enable the driver only near the zero current. But i think that will be difficult at 1MHz.


13
Dual Resonant Solid State Tesla coils / Re: Phoenix's Large DRSSTC II
« on: April 29, 2019, 08:50:58 PM »
This is an awesome project.
I'am an electronic Engineer but I haven't the competence to develop an so high power device.
You are crazy xD please pay attention because a failure will results in a new years show xD

14
Solid state Tesla coils / [Development] Project of an SSTC driver.
« on: April 29, 2019, 08:25:46 PM »
Dear all,
I am developing a new SSTC driver to drive my small teslacoil, because the current driver is not very reliable.

The characteristic will be the followings:
   - Half-bridge configuration
   - Feedback on the secondary with an current trasformer.
   - 2x Separated Board: 1 board for the driver and one board for the half bridge
   - Measure of the primary current
   - Measure of the switch frequency
   - Measure of the mosfet temperature
   - UVLO (under voltage protection)
   - Mosfet protection (Gate protection with zener, Drain-Source protection with snubber and TVS)
   - Minimized connection inductance to allow high current switching at high frequency.
   - Microcontroller STM32F103 to acquire the data, enable/disable the driver in the case of fault condition and generate the interrupt signal.
   - Wi-Fi connect with an ESP32 to send all acquired data to an computer software and to receive the Frequency and duty-cycle of the interrupter, in addition in future to stream the music

If you have any suggestion please write me!!!
I have completed the bridge schematic, tomorrow I will post them.

15
Solid state Tesla coils / Re: New small SSTC
« on: April 28, 2019, 08:30:39 PM »
I'am starting to project the new tesla-coil driver with some interesting features.
If you want and if you are interested I can open new thread with the description, schematic, layout and the software.

16
Solid state Tesla coils / Re: New small SSTC
« on: April 24, 2019, 11:48:59 AM »
Today I have start-up again the tesla-coil without change anythings and .... MOSFET it dies :(

Therefore I have decided to reproject the driver, the new versions will be base on the the leonsocean schematic: https://www.loneoceans.com/labs/sstc2/  but with some modifications.

- 1) The secondary will be the same
- 2) The primary will have the same size and 1/2 turns (not 1+1 because will be used an half-bridge driver)
      I will use an high coupling and a very low primary inductance to have an high voltage gain and an high primary current. I think that is the key to obtain a good spark from  this small
     teslacoil
- 3) Use an STM32F1 to control all the system
- 4) The inductance of the primary will be in the range of 0.1uH -> At 1 MHz will be a primary reactance of 1 Ohm, therefore with 24V of supply will obtain like 24A that is to mouch, therefore I
       will limit the duty-cycle to about 10% to have an RMS current in the range of 2-3A maximum.
-  5) I would like to add a mosfet protection(Snubber and short-circuit protection) to not kill to many mosfet xD
-  6) Use a better mosfet that support higher voltage, to prevent the destruction. Therefore the driver will be drive an high capacitance mosfet respect the actual mosfet.

Other suggestions? Can be works?


17
Solid state Tesla coils / Re: New small SSTC
« on: April 23, 2019, 08:18:17 PM »
Now work like in the first video, little bit better.

I have noticed that without interrupt the coil produce only 3mm-4mm of spark and consume a lot of current like 7-8A. The coil work very well with a low duty-cycle (betwen 0-10%).

I think that is due to the very low inductance of the primary coil (Only 1 turns) that results in an high peak-current because the reactance at the risonance is very low.

I think that this mini tesla coil work very well because:
  1. Low inductance of primary coil = High primary current and High ratio L2/L1 -> Higher voltage gain
  2. Very high coupling, probably will be in the range of 0.7-0.8. Therefore results in a very high efficiency and then the high coupling not cause problem because we use small power.

18
Solid state Tesla coils / Re: New small SSTC
« on: April 21, 2019, 08:59:56 PM »
News, now works, bad but works xD
The problem was the layout, I have made some connection too long duringe redesign (The connection between the capacitor and the primary coil). Now I have shorted all connection (are shorter also respect the first version). In addition, now the coil is above the coil and not away like in the version of the video.

However now I obtain a little spark and absorbe very high current, about 5-6A. Probably is due to the poor tuning of the C12 because I have used the old capacity, but the inductance of the connections and the parassitic capacitances are varied due to the change of layout.

Tomorrow I continue with the test!

Thank you very much !!!

19
Solid state Tesla coils / Re: New small SSTC
« on: April 21, 2019, 05:34:09 PM »
trying to fix up the "box" of the teslacoil, ... I have broken the connection between the secondary and the ground (I didn't see before turn on the tesla coil) and one mosfet it died.
Therefore I have unmounted all tesla circuit and remounted with a new mosfet and then the other mosfet it died. Why? Now doesn't works and kill mosfet like Terminator :(
Why the mosfet die?

20
Solid state Tesla coils / Re: New small SSTC
« on: April 21, 2019, 09:39:16 AM »
Now works!!!!
I have made the followings changes:

   - Changed the primary, I have used the old primary.
   - Increase capacitance C12 from 1nF  to 3nF.
   - Added a BIG capacitor on the power supply!
   - Added the interrupter with a duty-cycle of about 5%

Now the power consumption is about 24V 1A
The results:

I think that with only 24W is a very good results, no?

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