Re: I know this will sound stupid but...



ehsjr wrote:

Eeyore wrote:
John Fields wrote:
martin griffith <mart_in_medina@xxxxxxxx> wrote:
John Fields <jfields@xxxxxxxxxxxxxxxxxxxxx> wrote:
Eeyore <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:
raddriver02@xxxxxxx wrote:

I know this will sound stupid but I want to be sure that this doesnt
blow up in my face (literaly). How do you make a simple circuit
consisting of capascitors to increase the volatage in a 12v DC supply?

You can't.

---
Sure you can, dumb ass.
---


You do it with an AC voltage if you use capacitors and diodes but not DC.

Charge two or more capacitors in parallel and then discharge them,
in series, into another capacitor. Do it fast enough to compensate
for losses and the load, and the voltage across the output cap will
rise to nearly n Ein, where n is the number of caps dumping into the
reservoir.

Compound charge pump, dopey donkey, No AC involved.


hmm, so what do you use to switch the capacitors? AC or DC

---
In the simplest instance, relays with DC coils.


Fed with DC ?

Graham


Of course. Hell, you can do it manually with
DPDT toggle switches.

+12 -------+
|
Gnd---o o---o o---> 24
\ \
o o
| |
+-[CAP]-+
| |
o o---o o---> 36
\ \
o-[CAP]-o
etc

At the slow speed of manually flipping toggles,
there would be a limited number of applications,
perhaps single pulse or very low current needed.
But the principle to raise the voltage by
switched capacitors is there. John takes it
a step further, dumping the voltage into a
reservoir cap and switching rapidly, which expands
the applications this can support. You must know
there are chips that do this

Absolutely.


- so what is your point?

It's not DC.

Graham

.

Relevant Pages

  • Re: Baisc resistor, electricity, and capacitor questions
    ... actually use up voltage or current as it passes through the ... capacitor then LED in series with a 9V battery, ... With the switch to the left, the cap can charge - ...
    (sci.electronics.basics)
  • Re: Capacitors & Capacitance
    ... > circuits use capacitors but I don't understand what there role is. ... that only has a common and + supply of voltage. ... of the capacitor to the center pole of the switch, ... to common and the other side to the + terminal on the 9 v battery. ...
    (sci.electronics.basics)
  • Re: Magic Capacitor on car.
    ... > What I'm asking now is the theory behind of these cap., ... > how come they suggest to connecte a cap to the battery? ... A battery is essentially a voltage source in series with a small ... When the ignition switching circuit ...
    (sci.electronics.design)
  • Re: Buck circuit question
    ... So think of it in terms of current, not voltage: ... When the switch is closed, ... Most of the power loss is at the diode, ... So when the switch is closed the inductor provides the current for the load, which provides the votlage for the load (via the cap) and the current also. ...
    (sci.electronics.basics)
  • Re: when to use polarized caps
    ... I'm setting up a voltage ... and a cap across the output voltage... ... you couldn't get cheap large value ceramic capacitors. ... Those capacitors are there to ensure the 3 terminal regulator doesn't ...
    (sci.electronics.basics)