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Registered Member #1571
Joined: Wed Jul 02 2008, 03:26AM
Location: Bendigo Victoria Australia
Posts: 44
Hi there,
I thought I would have another bash at this... I have wanted to construct a CW multiplier system that operates at resonance - that is, the CW stack resonates with the secondary of the transformer - Flyback. I understand you can sweep the frequency until you find the point where the current is at its highest - this should indicate that the CW is resonating.
It would be nice to have an idea as to what the equivalent capacitance of the CW stack is. Knowing this you could target a frequency that suits the IGBTs and diodes in the stack when you design the inductance of the secondary.
So I shall through it out there. Is there a way of working out the equivalent capacitance for a CW stack?
There will be no load on the stack - nothing connected.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I don't believe this is possible. Sizing the capacitors for resonance makes them far too small to deliver a steady output voltage with low ripple, and the diodes "De-Q" the resonance anyway.
You can treat the CW stack as a "Large" capacitor that looks like a short circuit at the operating frequency, and drive it with a SLR type circuit that series resonates the primary of the step-up transformer.
In a small-signal analysis (where the diodes appear as small resistances) the input capacitance is something like half the capacitance of the first capacitor in the stack. But the CW actually works in a large-signal mode where the diodes behave like switches, so the result of a small-signal analysis isn't relevant.
Registered Member #1571
Joined: Wed Jul 02 2008, 03:26AM
Location: Bendigo Victoria Australia
Posts: 44
Hi Steve, others, could you outline what an SLR topology is for me. I have tried to look for this acronym but the search wont work for less than four letters.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
si2030 wrote ...
Hi Steve, others, could you outline what an SLR topology is for me. I have tried to look for this acronym but the search wont work for less than four letters.
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Equivalent capacitance of a Cockcroft Walton Multiplier
