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Topics - JCF
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1
« on: August 27, 2022, 12:11:53 PM »
Hello everyone, I experienced 2 crashes of my MMC this year with Cornell-Dubilier 940C 47nF 3kV dc ±10% Thin Film Capacitor First crash capacitor exploded second opening crash and black leak on the IC The operating voltage was 200Vdc. The MMC is a combination of 3 x 3 capacitor. What append ? 200Vdc is low, Is this a problem with the pulse width being too large? A failure of a capacitor (always at the beginning of one of the rows of the MMC What is the maximum pulse width not to exceed, frequency around 20Hz For the design of the tesla coil see https://highvoltageforum.net/index.php?topic=1695.msg13172#msg13172
2
« on: November 01, 2021, 04:41:15 PM »
Hello, with my new coil, I have strange oscillation who appear for certain plunger settings when I want to make the minimum of phase shift . In this case the sound of sparks are not regular and an oscillation appears at the lower signal output of full brige (vdc = 50V) Measure of resonnance frequency of primary alone 157khz, secondary alone 153khz have you ever met this tesla Detail 80 180.txt
4
« on: July 06, 2021, 03:14:49 PM »
hello I have a new Tesla coil in progress . I'm wondering questions about pimary coil. the secondary has a length of 70cm 8cm dia with 0.20mm copper wire (about 2300 / 2400 turns), this to obtain lower resonant frequency. for the primary what is best to achieve 5 turns or 10 turns (with change of capacitance). Does this have an influence on the length of the sparks? Mesure afternoon frequence secondary = 153khz 74mH 394 Ohms (dc) Specs Coil PVC 8 cm DIA 0.20mm FIL 2400 TOURS 18cm 37cm tore v3 ok.txt
5
« on: July 01, 2021, 12:06:57 PM »
Hello I have a doubt: what is an MMC used for and where is it placed in the primary? when I put a 0.022µF capacitor in series with the primary coil to adjust the resonance frequency is it an MMC?
6
« on: May 04, 2021, 07:17:08 PM »
Hello all, I had planned to replace a driver (chinese) which works correctly with a full bridge. for which I have already sent several posts in the forum see https://highvoltageforum.net/index.php?topic=1386.0the Chinese yumbao driver worked correctly with the full bridge (GDT, 2 IGBT; CM200- DU -12F) I started testing the UD2.7 driver since 3 weeks, with resistors instead of the tesla coil everything is ok to day I make connections to use the new ud2.7C big problem : the driver and the gdt (test winding) does not give very satisfactory signals without HT after I put into service a HT about 80V the current of the 24V power supply UD2.7C was high (2.9A???) and the protections: diodes on resistance and protection diode 1N5819 and J18Ca were very hot (smell burn) On the diagram there are 4 diodes on the gate resistance I didn't understand anything, tomorrow I'm welding new components
7
« on: April 01, 2021, 11:35:24 AM »
Hello all, what is the current consumption on 24V for the driver in idle mode (for testing after soldering). Thank's
9
« on: February 13, 2021, 07:07:50 PM »
Hi does anyone know this driver ? this afternoon I received the driver from Ebay, here is an overview of the printed circuit. a little puzzled with the GDT driver. What do you think about power MOSFET (Alpha & Omega semiconductor) ?
10
« on: January 15, 2021, 04:41:47 PM »
Hi, does anyone know the driver below is this valid for have good performance ? how to use the optical connector HFBR 2521 where I can buy a driver fully equiped with phase correction, OCD, Feed back ? Thank you
11
« on: January 14, 2021, 06:11:06 PM »
Hello to all, I am recently on the forum. I have a small Tesl coil made with 4 IRFP 460. I want make a new one with primaire 18cm (15 turn) et secondaire 55 cm (1000 turns). Driver is a Cloud Leopard Ebay. For that I have 2 CM200DU1-2F IGBTs that I would like to use to make a full bridge. see the signal on this 1 picture. I have a lot of parasitic peaks and a false signals on a 200 Ohm resistor which replace the primary to make a test at 50 v max ? picture 2 signal on Gate IGBT I do not know what to do now ?, I tested the 2 IGBTs, they are good, Signal of the four GDT secondary outputs on 1 kHoms correct ...
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