Author Topic: Step Charging Capacitor  (Read 2539 times)

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Step Charging Capacitor
« on: August 05, 2016, 23:41:05 pm »
Here's a circuit I use quite a bit, in various forms.  The diode can point in either direction.

(https://s20.postimg.org/p63we7xgt/Step_Charging_Capacitor.gif)

Normally, with the caps in series, the current going into the larger cap is limited by the amount of charge which the small cap can hold.  However, if the small cap has high internal leakage, this leakage can quickly discharge the cap - without an external short.  This leakage current allows the larger cap to charge with a step charging effect.  Each time the small cap looses charge, its recharging sends another pulse to the big cap.  One example of internal leakage is HV corona at the edge of the plates.  This leakage often occurs when using home made caps.  Likewise, a cap which is operated at four or five times its rated AC voltage exhibits a large amount of internal leakage.

High leakage transformers are also common, and are used for current limiting, especially in the event of a short circuit occurring on the output.

JV

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Re: Step Charging Capacitor
« Reply #1 on: August 05, 2016, 23:51:24 pm »
hey
I tried finding your site before today with no luck . you talked of going of the grid so figured you dropped everything.


the thing with the diode its also open circuit in reverse bias so should be open voltage reading yes ?  well in the right circuit config.

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Re: Step Charging Capacitor
« Reply #2 on: August 06, 2016, 04:15:36 am »
Sorry, Will.  I don't really have time for any more discussion right now.  Ed Mitchel just sent me a harassing PM - saying he hopes I "won't be a problem for him this time" like I "have been in the past".

I do have a lawyer on retainer right now, and my time will be better spent on consultations.

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Re: Step Charging Capacitor
« Reply #3 on: August 06, 2016, 16:54:35 pm »
I am now stepping in and i want to make myself very clear that this platform is NOT for personal wars.
If members using this platform for sending harassing pm's towards others, i will stop them.
Its that simple.
This forum i setup with my friend Brian for providing a place where we can share and discuss our technology's.
It trully hurts my soul seeing what is happening.
No respect towards me and towards mankind. Thats how i see it.
I spent 10 years keeping this platform alive and clean.
Not always appreciated by some users.
Its not easy.
So, if one of you feels the need to try my patience, then please do so and your out forever here.

With pain in my hart....
Steve

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Re: Step Charging Capacitor
« Reply #4 on: August 06, 2016, 21:06:35 pm »
I never intended, nor expected, any of this to happen.  I just thought that if someone says a smaller cap can't be used to charge a larger cap (in series, of course) and I  know of an exception which may be relevant, then I should present what I know.  I didn't even quote or mention anyone by name.  The last time I posted to his thread, my message was immediately deleted, so I posted here.  (Something about certainty that the VIC will work with a gas processor requires that it also works with the water splitter stage.)  Presenting a differing opinion doesn't mean that I'm someone's "enemy".  This is a discussion forum and DISCUSSION is what should be happening.

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Re: Step Charging Capacitor
« Reply #5 on: August 06, 2016, 21:29:35 pm »
hey
I tried finding your site before today with no luck . you talked of going of the grid so figured you dropped everything.

I just haven't had time to set up my new site.  Every message I want to transfer from HB will have to be posted individually.  And I've also got some hackers on my back - forcing me to take down my @thespaceoffice email account.  I just don't have time to deal with the expected deluge at a new site.  I may still get the site up and running, but it may just be a blog-type presentation.  However, like anyone else, when I post something, I would like to get some discussion in return.

Quote
the thing with the diode its also open circuit in reverse bias so should be open voltage reading yes ?  well in the right circuit config.

As shown in my above circuit, the diode is a blocking diode.  It prevents the smaller cap from discharging, when a normal cap is used.  But I've also used a switching diode with this type of circuit - including a spark gap.  That type of diode becomes conductive at a certain level of charge in the larger cap.  Sometimes a 'tiny ripple' (from the small cap) going through a pulse in progress can have an astonishing effect.

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Re: Step Charging Capacitor
« Reply #6 on: August 06, 2016, 22:09:55 pm »

 I use dto check in on your site but lost any trace f tektrical . I tried net archives too . I just assumed you closed it .I do recall on HB ,the hassles with neighbours etc
I think its good there is this platform to put your ideas across , its interesting , simple .    =watcher

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Re: Step Charging Capacitor
« Reply #7 on: August 13, 2016, 19:13:57 pm »
Here's another circuit which can step charge a capacitor:

(https://s20.postimg.org/vot2g5i5p/C_Stack.jpg)

This apparatus, called a C Stack, consists of two capacitor plates surrounding a secondary capacitor which also has two plates.  This output capacitor, in the middle, has a resonance determined by the value of the load resistor #1.  Below this frequency, the output waveform will match the input to the outer cap.  When the AC input is a triangle wave with a frequency above the output cap's response time, the middle capacitor will pull a positive square wave from a voltage source, such as a battery.  If the load resister #2 is a capacitor, a step charging waveform will appear across that cap, and its voltage will go up (intensify) with each additional pulse.
« Last Edit: August 13, 2016, 20:19:39 pm by tektrical »