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Messages - dexter

Pages: [1] 2
1
Current is induced into the ring only when the magnetic flux changes. In the DC experiment that happens when the switch either closes or opens, so the ring will not move that much. When AC is applied the long iron core the coil and the ring is a induction motor.

A capacitor discharge into the coil result in the DC effect.

2
I think this is the schematic you're using: * ud27-schematic.pdf
Based on the picture of your PCB:
J4 open (the inductor is installed)
J9 open
J7 closed and J16 open (need confirmation on J16), adjust RV2 for uvlo
J14 open
J15 open if you're using HFBR2412 and/or D12 omitted but D13 is required
J6 both up or both down

3
Solid State Tesla Coils (SSTC) / Re: Mains synced sstc questions
« on: April 15, 2021, 10:48:12 PM »
Hi. Here is my take on mains synced sstc using the same staccato circuit but with a few improvements :)

I used a single power supply (mains transformer) for both the zero cross detection and to power the controller. To do so you'll need to add a diode in series with the bridge rectifier (note 1)

This circuit will utilize both peaks of the mains sinewave giving you up to a max 100 bps

The phase control pot (Power) when turned to max will either never reach the max 10ms time or will exceed it clipping on the next period resulting in a noticeable drop in BPS. To fix this choose the timing R C a bit over 10ms but add a trimmer in parallel with the pot (note 2)

Edit 1. sorry for the messed up schematic :) but is the same as Kaizer VTTC staccato
controller
Edit 2. my profile pic is this mains synced sstc running at 100 bps and max power (10ms)

4
Light, Lasers and Optics / Re: Problems with toslink receiver
« on: March 22, 2020, 01:14:00 PM »
With some extra components the toslink receiver can be made to work no matter how long pulses you want to send.

on interrupter side add an extra 555 to send a train of high frequency pulses instead of a flat ON

on receiver side add an integrating circuit to recreate the flat ON signal

5
When buying parts for the driver I couldn't find the UCC27423 chip, so I thought I could use the UCC27424 chip.

i made the same mistake on my first DRSSTC and couldn't get why my coil didn't start

the gates of the p channel mosfets are capacitively coupled so they need a high to low transition in order for one of the p's to conduct

if you use a non inverting driver they'll get a low to high transition and won't turn on

with an external signal the coil will work but you still loose the 1st cycle

6
Solid State Tesla Coils (SSTC) / Re: SSTC not getting interrupted
« on: September 09, 2019, 07:59:23 PM »
single chip double gate drive ic's work well
make sure they are inverting and non inverting
i successfully used MCP14E5 4A gate drivers from Microchip in both half and full IGBT's bridge SSTC's

7
Can someone please recommend good caps to use here, cheaper than Cornell Dubilier? (I'd like to save my extra MMC cap as a replacement part.)

i just bought some of of this caps: https://www.ebay.com/itm/12PCS-0-68uF-680nF-2000V-MKP-TESLA-Pulse-Capacitors-Arcotronics-C4AS-IBGT/173956817574?hash=item2880a262a6:g:37YAAOSw18Jb7q5a
rated for 25A RMS
you can check the seller catalog for other specs

8
What is a good max BPS for music? I think 1500BPS should be enought. Or should I go for more BPS?
I will recalculate the MMC in relation to the new BPS.
depends on the music...
Keep in mind there are pauses and the BPS is not constant so the RMS current will vary quite substantially.
I wouldn't go as far to overdesign the MMC for 1500 BPS but i'd go ~10-20% over the minimum values for normal operation.

Is it now better to have more or less turns on the primary side, or is that completely irrelevant in the case of one turn more or less?
Because I would then choose the MMC accordingly.

read this
https://highvoltageforum.net/index.php?topic=113.0

9

BPS = Basically the Interrupter frequency??
On time = time the coil is on --> on time of the Interrupter signal??
I want to use a Musical interrupter later.
To play different sounds the musical Interrupter changes the frequency of the Interrupter signal? --> different BPS

Yes for all

For your MMC the.0.5 one might suffer when playing music as higher BPS translate to higher rms current. Increase tbe BPS in the MMC calculator and see how much the Temperature rise per cap increases. If you plan to use the coil for sort-ish periods of times (giving the MMC time to cool) it will work fine.

Another thing to consider is impedance matching of the primary and secondary... The primary capacitor plays a role in that and there is a formula but i can't find it right now (on the phone)

10
I had the same price issue with HFBR's when i first moved to DRSSTC's so i tried TOSLINK. Bought a pair of FCR6842032T and R and a TOSLINK optical cable. Maybe breadboard testing wasn't the best idea but i couldn't get them to work. For some reason the output of the receiver could  maintain a stable logic level HIGH for only a few hundreds of ns after which only noise. Tried everything pull up/down resistors comparator bought new receivers and nothing.

In the end i found some OPF2414 receivers on ebay for ~4$ bought a ST Fiber Optic Connector used it to modify the TOSLINK optical cable, replaced the TOSLINK transceiver IC with a high flux red LED and added a LM311 after the OPF2414 because its output was to small (i made my own UD pcb's so adding one more comparator wasn't an issue) and everything works.
Basically from the initial TOSLINK set i only used 1 transceiver (just the plastic part) and the cable which i also modified by changing the connector to a ST connector.


"do you know what type of connector/fiber cable they work with?"
https://www.tme.eu/ro/en/details/avk-216-0200/audio-video-cables/goobay/50447/

11
1. A DRSSTC driver always works at the resonance of the primary LC. The intrerupter doesn't change it.
A problem with the onetesla driver is the lack of overcurrent protection. They get around it by having the coil tuned and by controlling the on time with their intrerupter.
If you use their driver for other coils you risk exceeding the current capabilities of the IGBT's and blow them off.
2. Yes you need to adjust the number of primary turns for a different secondary coil. JAVATC is a great tool but tuning still has to be done manually. Given the lack of overcurrent protection of the onetesla driver you risk blowing the IGBT's when tuning the coil.
3. The bottom of the secondary coil must be connected to earth. For small coils the earth pin of the outlet can be used but for bigger and powerful coils a separate earth ground must be used. Or a sheet of metal could be used but it has to be some distance away from the primary coil and i think it should be at least connected to mains earth.  As for the driver it should be shielded (placed inside a metal box) and connected to mains earth.
4. 5. The polarity of primary coil and feedback transformer have to be in phase. If your coil doesn't starts flip the feedback transformer or the primary coil polarity

12
Capacitor Banks / Re: Bought huge capacitors
« on: June 16, 2019, 08:25:16 PM »
in a 2015 post from 4hv by Kizmo about triggered spark gaps he says it works at any capacitor voltage even as low as 20V
https://4hv.org/e107_plugins/forum/forum_viewtopic.php?p=1&id=171055#post-171722

also saw some russians playing with a homemade taser on the mains wiring of their house which had the same effect as a triggered spark gap

13
I've seen a paper about calculating the self capacitance of a solenoid and in one of the methods they used the self resonance frequency, measured inductance and the length of wire to calculate the self capacitance.
but in their calculation they used l=λ/2 (l= length of wire)

i'm confused... which formula λ/2 or λ/4 describe the self resonance of a solenoid?

14
Its a nice idea, but 50 Hz is not giving the right sound is it? Since its not going positive and negative, but just on/off, maybe 100 Hz is a better emulation of full wave rectified, non-smoothed mains sound.

i used 100Hz because 50 didn't sound right

15
Capacitive and inductive reactances depends on capacitance/inductance and frequency.
Xc=-1/(2pi X f X C)
Xl=2pi X f X L

"Resonance occurs when capacitive and inductive reactances are equal to each other."
that means: Xl=Xc
rearrange the terms and you get: Frez = 1/(2pi X sqrt(L X C))

So whenever you change the capacitance or the inductance the frequency at which Xc and Xl becomes equal (also known as resonant frequency) also changes.

Mads-
   I studied resonant circuits back in the early 1950's.  I vaguely remember that there is some negative "cost" to having L and C too far away from eachother, but I don't know why.
the energy stored in inductor and capacitor is:
Wc=0.5 x C x V^2
Wl=0.5 x L x I^2
At resonance Wc=Wl
For an inductance heater you need high current in the work coil. To achieve this a small inductance coil is used but
 a large capacitor with a high voltage rating is required. So the "negative cost" translate to a monetary cost :)

16
I too didn't understood exactly how UD2.9 works so i made it on a bread board (just the 74HC74 74HC08 74HC14 chips and the passives) feed it signals for FB OCD Interrupter and it works as advertised.
J16 open - works like UD2.7
J16 closed - no output for the duration of the OCD


yellow trace - intrerupter
green trace - output of one of the 74HC08 gates before the UCC

How the driver generate the dead time?
It doesn't. The signal that goes to the GDT comes from the Q and Q- of the comparator which are 50% duty cycle signals and no disproportionate delays seem to be added on the UCC and on the power stage

17
What about the number of series and parallel capacitors?The datasheet doesn't mention the current rating,but in theory the more capacitors in parallel,the less the ESR is or in these applications it makes not much sense?For example at 110kHz,800A which one should I choose, 0.2uF 6kV(more in parallel) or 0.15 8kV(more in series)? (in theory more in parallel)

You can calculate Ipk=C*dV/dT

If 6kV is enough for your coil i'd go for 0.2uF (more capacitance and more caps in parallel)

18
Beginners / Re: SSTC wıth a balast
« on: April 27, 2019, 09:09:31 PM »
connecting the primary coil the other way around even if both coils are turned in the same direction is still the first thing to try on a secondary feedback based SSTC when you get no sparks

19
Beginners / Re: SSTC wıth a balast
« on: April 27, 2019, 08:56:36 PM »
But there are no sparks forming on the tesla coil. What could the problem be?

try connecting the primary coil the other way around

20
Spark Gap Tesla Coils (SGTC) / Re: Question about secondary
« on: April 18, 2019, 09:20:15 PM »
on all my SSTC's i used carbohydrate foam (also known as wood) for the end caps and never had an issue

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