Author Topic: Looking for MMC Capacitors  (Read 179 times)

Offline johnmadland

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Looking for MMC Capacitors
« on: November 11, 2021, 01:30:15 AM »
New to this forum...

Over the last couple years I've been building a fairly large DRSSTC. I've never built a tesla coil or something at this power level. Probably not a good idea to start this big but I've been figuring it out as I go. Wound the 42 inch coil on a grooved 8 inch ID PVC pipe and coated with epoxy. Toroid made from rings of aluminum aircraft tubing. Inverter uses a CM300 full bridge at 680V powered from a multiplier supplied by 240v single phase made from an SCR brick to regulate the bus voltage. I have 90 amps available which I hope is enough. Brough it outside and found the resonant frequency with a scope and function generator. Right at 42 kHz so I'm ready to buy caps for the MMC but I can't really afford thousands of dollars of capacitors. I haven't really been able to find any used caps for a reasonable price so I'm looking at new Chinese caps. I've been looking at Dawn Caps which seem like they would work especially since they're meant for pulse power. I also found some unbranded caps on eBay which look good but don't have much info. For the eBay ones I was thinking 2 caps in series could work... Any opinions?

Here's the ones I was looking at on eBay:

https://www.ebay.com/itm/202393802369?_trkparms=ispr%3D1&hash=item2f1f9c5681:g:bIkAAOSwT0Vf~BFh&amdata=enc%3AAQAGAAACoPYe5NmHp%252B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsSjVt3vLKCbov98Z19qhuwY5KG9liAYQDCMeZRHxtSESzOGKUu2PE46mEglQXOYkr5kO6c%252FxMGlxAVOTIzaEcREBZiK1hBSHD1ushkxk1njefnWMhYIflbWmuYOic1Xn6oa9JGsxnyi89q1HWhP0z3P1egranGXjjauffovnD8aO7pJypKEsdXWHSks31%252Fpc1Fw7g%252BjuoZg9HnEDEuemN9NMWXOKrHhUZ7x9YnMIopoDXmvXjaepqsMU%252BK3Tm4IOy8utNWUV5wx9B7VinpXf6P%252FfeZSma3Vv9n5oTf7%252Fw5mMfbb2u4qIBb0%252BV7W14xRRJTf0E4y3vU8q8tE9o9mcIEcRupPDfMm%252FvvZhyk%252BHhZ5cd9im2Do3yGAKE9saSnny8y6exbIWsPXM6X2PVk9Y6B7vFHnpiMLk5t0FhSqNHo9EOY%252BNknuF4fzLps2RHGBU4wLdZQ9WMPhI%252Bmy45nLqgcibRns7DBD%252B6yV8oEzG3keHgESjtQUg%252F0PMy2NFf9vsg%252ByJ6fhDUDN%252BOvT%252FogQITMxnqtWaJQu6TMT4GkNuHBfGhovLcqMAr0hJxbPjBt0O9cGWAmVufVCcvdlzBsx1zN4%252FbjsNM37S1fC%252BXhl%252FiP4zASkROWN5J5HSIk6%252Fz6liOVp9E%252FrP7Mar0qjxQRyHEHriUEbFaDK7MWU1NhtAYYPx67BpPhJ3tyGVy25a2fQKcAJzfcu1qJR2aOJL2mVcNSekR80b3C92vzEfVKctpbIDsiby1mCLrOz1PjrkRlEofeY69KKx3b0F9NAxjJlueJ2frLel2BWEcjAzQBGd9JCeNRbTLhXl95qrlRFvnkTK0q6N1L5cqvWRzmm94Sv5Wc8g%253D%253D%7Cclp%3A2334524%7Ctkp%3ABFBMhoKaxqFf

Thanks in advance,

John
« Last Edit: November 11, 2021, 02:00:40 AM by johnmadland »

Offline Mads Barnkob

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Re: Looking for MMC Capacitors
« Reply #1 on: November 11, 2021, 11:46:13 PM »
Dawncaps are proven to work good, by other coil builders.

Two of those caps from the link, in series, is not going to have a high enough RMS current capability for a CM300 to be pushed hard, you will have to watch the temperature on those.

How is prices on CDE 940C capacitors compared to this?

Did you take a look at the MMC calculator ( https://kaizerpowerelectronics.dk/calculators/mmc-calculator/ ) and the list of good capacitors for inspiration to make a cheaper MMC? https://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/good-mmc-capacitors/
https://kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
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Re: Looking for MMC Capacitors
« Reply #1 on: November 11, 2021, 11:46:13 PM »

 


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