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Registered Member #2288
Joined: Wed Aug 12 2009, 10:42PM
Location: Cambridge, MA
Posts: 179
Yanom wrote ...
what is the formula that determines this?
Calling peak AC 170V, then the max dv/dt is 170 * 60 * 2pi = 64,100V/s
I_cap = C dv/dt = 10e-6F * 64,100V/s = 0.641A
This does mean that you have to connect the capacitor to charge before plugging it in.
Yanom wrote ...
I'm confused as to what you mean by this. Firstly, you mean the big 2520uF cap bank that I want to charge up, right? And secondly, you mean hook up the leads from the powersupply to the capacitor before flipping the switch? So it doesn't arc?
Yes, the multiplier should be drained (probably by adding a bleeder, which it should have for safety anyways). Then, the large capacitor to be charged should be connected. Last, plugged in/turned on.
Odds are you could do it in whatever order you want since 10uF is pretty small and isn't likely to exceed the i^2t rating of the diodes, but it could if they're really low quality or you just get unlucky.
It's not arc protection, it's protection for the last diode in the string which carries output current.
Registered Member #4659
Joined: Sun Apr 29 2012, 06:14PM
Location:
Posts: 158
Thanks for the replies! I got it to work, then upgraded my CW gen to 3 stages (and added bleeders) Then I got a little 20uF, 450V rated capacitor and charged it up. On the stage 2 tap (what was there beforehand) it charges up to 310v just fine. Then I tried removing it, connecting it to the stage 3 tap (new wire sticking out), and it charges to..... a whopping 250v. Does anyone know why? I've noticed on the simulator, now, that the waveform for the stage 3 tap oscillates, peaking at around 620v, while the waveform for the stage 2 tap stays fairly flat. Possibly the 450v capacitor can't handle it? it's my highest voltage rated capacitor (of significant size), and it didn't BREAK the capacitor - I can go back to the stage 2 tap and charge it to 310v just fine.
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Some questions about transformers.
