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Re: [TCML] Pulse Cap question

Hi Matt,
so you would say, this cap isn't the best for tesla use? Not as good, as good old Maxwell caps are for example? In particular, this is a special capacitor from US manufacturer "Hipotronics", it has 7 single caps in one big metal housing, which can be connected in parallel. The cap is rated as follows: 

40kV
7 x 0.03µF
300pps
4.5µsec
I think it comes from a pulse forming network, powering a big magnetron or such things. The cool thing with this cap would be, you can easily increase/decrease the capacitance in 30nF steps by simply tapping 0-7 capacitors. 

Regards,
Stefan
----- Original Message ----- From: "mddeming--- via Tesla" <tesla@xxxxxxxxxx> 
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, October 22, 2014 11:30 PM
Subject: Re: [TCML] Pulse Cap question



Hi Stefan,
Usually, this is the discharge time into essentially a dead short, not the time of one oscillation. One cycle consists of charge-discharge-reverse charge-discharge. Therefore, the the minimum time for one cycle would be not less than four times this, limiting the oscillating frequency to something less than ~55.5 kHz. Trying to operate above this frequency will result in high heat dissipation and very fast damping of voltage. The internal resistance may even be high enough to prevent oscillation altogrther. 

Matt D




-----Original Message-----
From: miles waldron <mileswaldron@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, Oct 22, 2014 4:28 pm
Subject: Re: [TCML] Pulse Cap question


Probably discharge time. It can take 300 discharges per second, and each
discharge elapses in 4.5 microseconds.

On 10/22/2014 11:31 AM, Teslalabor wrote:

Hello,

the nameplate of a pulse cap says the following:

40kV
4,5µs
300pps

So it's rated at 40kV, 300 pulses per second, but what does 4,5µs stand
for? Is this the maximum ocillating frequency, the caps can withstand? f
= 1/T = 1/4,5µs = 222kHz?

Regards,
Stefan
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