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Registered Member #1525
Joined: Mon Jun 09 2008, 12:16AM
Location: America
Posts: 294
For my next project, I want to be able to charge a HV capacitor very rapidly, and I think a CW multiplier is the best way to go. However, my SPICE software doesn't seem to account for the voltage drop with output current inherent in the CW design, so I made this excel spreadsheet to try and produce a more realistic simulation. The focus of the simulator is determining power draw, since I hope to drive the CW with a portable inverter such as this one (1000/2500W).
Despite the success of my last project, I'm still a beginner in the world of electronics so I was wondering if anyone would care to look it over and let me know if anything seems glaringly wrong about it. The spreadsheet is neat and self-explanatory so hopefully it wont be too much trouble.
Also, I'm wondering: Does a CW multiplier require a pure sine wave input, or can it be fed with a much more cost-effective "modified" sine wave as produced by a cheap portable inverter?
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
With a transient simulation Spice should be able to handle this just fine. You can also try QUCS which has a pretty nice interface, although you probably will need to look at a video tutorial to figure out how it works, but will often require random tinkering with simulation parameters for it to be able to complete a simulation.
The CW multiplier doesn't care whether you feed it a sine, a square or a saw wave ... only the peaks matter in the end. It does have an atrocious power factor though. Are you quite sure the inverter can handle the peak currents?
Now this is an easy way to construct a car battery based charger, but DC->low frequency AC->multiplier->DC is of course not the fastest or most efficient way of doing this,
PS. inverter is such a silly name for a DC to AC converter, why do people insist on calling so many things inverters?
PPS. 220 AC is RMS voltage ... your voltage multiplier will asymptotically reach 4*sqrt(2)*220 Volt.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
The spreadsheet just evaluates the charging of a capacitor through a resistor, something trivial in any circuit simulator. The multiplier has an equivalent output resistance even if built with ideal capacitors and diodes, and this is more difficult to evaluate without a simulator.
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CW multiplier with capacitive load
