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Re: [TCML] Re: IGBT CM600 max current ?
Gary Peterson skrev:
Greg wrote:
. . . In my opinion, it does not make sence to speak about BPS with a [CW
oscillator type] coil like this, unless you pulse it.
Yes, it is a CW (continuous wave) oscillator. I am pulsing the 137 kHz
transformer at a rate equivalent its resonant frequency and with a 49% duty
cycle. Rapid rise time and cut off by the circuit controller or break, that
is to say, the solid-state switch, is critical to achieving proper
performance. I call this switching rate the "break rate" with the unit
being "breaks per second" or "BPS."
I have been planning a 75 kHz Tesla coil with an improved power amplifier,
incorporating a single CM600, for my next project. It occurs to me now that
the CM600 would not be able to keep up at that frequency, allowing fully
'undamped' CW operation.
I don`t have any nexperience with this kind of system, so can`t comment
on the suitability of a CM600 here.
. . . you could only achieve up to 2500 BPS, because the [50kHz] coil
rings around 5-10 cycles at Fres . . . so all in all, there is not time
available to get any higher.
In other words, the fastest rate at which I will be able to get the CM600 to
switch on and then off is 2,500 times per second with an 'on-and-then-off'
interval of 10 microseconds (.00001 sec.), do I have that sort of right?
I'm a little confused by your explanation.
My comments apply to a disruptive tesla coil.
I trust you are familiar with the operation of this, the mother of all
tesla coils.
Ringdown, say 10cycles @ 50kHz would occupy 200µS at every break.
Let`s be generous and say that we can recharge the cap in the same time.
That gives us 400µS/break, or 2500BPS
Hope this is clear
Unfortunately, the broken links are so forever.
Do you still have the original images?
Several crashed harddisks down the line, I`m afraid.
Cheers, Finn hammer
G.P.
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