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Topics - FilipŠebík

Pages: [1]
1
Hello, I want to know which varnish should I use to coat the secondary coil, because the one I have is meant for wood and it messed up my coil's windings. The varnish contains: acrylic dispersion, polyurethane dispersion, water, glycol and additions

The cause may be because I didn't keep the coil rotating while it was drying so that may be the cause of this problem (I didn't experience the same with my micro coil)

I would buy this https://www.tme.eu/gb/details/ep108/encapsulating-materials/huntsman/cw5620-hy5610/ but it's not available in my country and I can't source something similar. So can you recommend me a varnish that you know works 100%?
Thanks

2
Hello, basically why does it suck and is the OCD really needed at such a low power?

And if it sucks as a DRSSTC driver, then how good of a driver would it be for a SSTC?

Thanks for reading/replying.

3
So I am struggling to find a place where I can source components for fiber/opto isolated interrupter, so I want to know any Ebay links or tme.eu parts which will work or something and make this thread useful for people to use when they struggle to find it too. I looked up onetesla.com and they sell the fiber cable (10$), transmitter (8$) and a receiver (8$). Although I wouldn't mind paying something like 30 euros for those things+shipping but it's not always in stock and I struggle to find similar components on ebay. So, can anybody reveal his secret source of buying those components? Thanks

4
Hello, I want to make my own SMPS, but I can never find a way to calculate the VA rating for a ferrite core and I want to know who knows the equation for calculating VA rating and or the required turn/frequency for wanted or max wattage or something.

I would use this core FERROXCUBE ETD49/25/16-3F3 https://www.tme.eu/en/Document/882e54fb8772e021c51c30b1d1879eab/etd49.pdf
and I would like to make at least 500-600W variable voltage power supply (if the core is suitable), but I don't know the calculations required to do this. But for now let's have a fixed IN, OUT voltage and out A
Let's say the PSU will work with 230V AC, so 325V Peak, the power of 600 watts, Max current input of around 3 amps and the output voltage of 60 volts and output current of 10 amps and the switching topology is half bridge using mosfets.

How do I get the required turns/operating frequency and wire thickness for the primary and turns and wire thickness/turns for the secondary with the values that are written in the datasheet? I found this
Quote
Using the Ampere's law, you can get the following equation:

E = Ae² * B² / (2 * AL)

E: energy stored in the magnetic field
Ae: core's effective area
B: maximum flux density allowed by the core material
AL: core parameter, depends on Ae, magnetic circuit lenght and air gap lenght

You see, power (P) is enery by time. More energe and less time will result in a higher power.

P = E / t

The input power at the inductor is the energy stored (E) divided by ton. Ton is the duty cycle (D) divided by the switching frequency (fsw).

P = E / ton = E * fsw / D

This is an aproximate way to determine how much power you can obtain from a certain core. Actually there are losses by eddie currents, joule effect and stray flux.
But this equation needs the operating frequency for power calculation, so I can't learn much from it.
 
Helpful info
The 3F3 core parameters from Ferroxcube website:



PS: I am not asking you to calculate the things for me, just to help me and/or show us the equations for the things so it helps the people that will look for it

5
Electronic Circuits / Isolated Series Li-ion Charger
« on: December 21, 2018, 07:46:35 PM »
Hello people, I will build my own Boom Box but I don't want to use bulky Pb or GEL accumulators so I will use Li-ion batteries and they will be 4S1P pack or 4S2P. So I wanted to get a charger module off of ebay, but I didn't find any that can be LEGIT 100% working balance chargers so I decided to make my own scheme.

EDIT: (Accidentally pressed enter) It works with 4S batteries connected through NC contacts of DPDT and when its plugged into a charger, the charger will supply the load, the relays will open and the batteries will individually charge using TP4056 modules from ebay (that's why there are no LEDs in the scheme) and when the charger gets disconnected, then the relay will open and the batteries will supply the load
EDIT2: Wrong attachment
EDIT3: Schematic errors... What a nice day it was :(

6
Solid State Tesla Coils (SSTC) / My own SSTC Driver v1.0
« on: January 10, 2018, 04:23:28 PM »
Hey, I just designed my own SSTC driver. Its driver without a mosfet gate driver ICs, because they are expenisve, 3.86 for UCC37321 and 4.34 for UCC37322 and the mosfet stage is 2.76 for the 3 mosfets. Price is in euro of course :D

Here is the scheme:


There are no 7805 or 7812 regulators in the scheme, because everybody knows that they have to have them to make the 5 and 12 volts, but they don't if they have their own 5 and 12 volt supplies.

If you want the scheme for eagle, then send me a message.

This could drive a big load and be stable, but I need to test it before I can say that it works.

The only thing that I don't know, if the mosfets need any gate resistor at Q3, Q4, Q5 and Q6. If anyone thinks that it might not work because of something, then tell me and I will try to fix it. Thanks

7
Solid State Tesla Coils (SSTC) / Best core for GDT and FBT
« on: January 09, 2018, 03:47:39 PM »
Hey, today I took my SSTC driver to school and probed the GDT on oscilloscope. The things I saw... I can't even explain how horrible the waveform looked. I just though that the bad performance of my driver would be caused by my interrupter, which I probed too and its very good looking.

GDT: So to the core type. As far as I've searched, I found this https://www.tme.eu/gb/details/tx42_26-3e25/ring-ferrites/ferroxcube/tx422613-3e25/
Nothing more. I know its against the rules, but if someone wants to take their time, they can find a core on this page https://www.tme.eu/gb/katalog/ring-ferrites_113555/ Where I can buy stuff from and this would be useful for everyone that is looking for a good core.

FBT: I found this https://www.tme.eu/gb/details/ppas100/current-transformers/talema/as-100/ I don't know if 1:50 ratio is good for FBT, but as I've seen on many schematics that they use 1:50 ratio, I though that it should be good. If it would be better to wind my own FBT, then this one? https://www.tme.eu/gb/details/tx42_26-3e25/ring-ferrites/ferroxcube/tx422613-3e25/ :DDD I know I posted this one for the GDT, but I think that its ok too :D

Thanks for help

8
Solid State Tesla Coils (SSTC) / Do you need a power line filter?
« on: January 06, 2018, 07:44:39 PM »
Hey, I just built this tesla coil http://kaizerpowerelectronics.dk/tesla-coils/kaizer-sstc-ii/ and I only powered it from 12V which gave me no sparks at all, just to tune it. Now I want to know if I need a line filter to power the primary from a transformer or mains and what would happen if I didn't use it. Thanks for the help

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