Voltage Doubler Arrangements

Discussion in 'General Electronics Chat' started by haditya, Apr 1, 2004.

  1. haditya

    Thread Starter Senior Member

    Jan 19, 2004
    220
    0
    the other day i came across these voltage doubler and tripler arrangements using diodes. unfortunately no explaination was provided for the same on the site.
    so i need to know -what is their function?? do they really double voltage?? where are they used
    thanks
     
  2. Battousai

    Senior Member

    Nov 14, 2003
    141
    44
    Are you talking about "bootstrapping?"

    Imagine you have a capacitor with one end tied to ground, and the other tied to a voltage source V1. You charge (assuming some finite resistance through the wire) up the capacitor to a voltage V1. The charge stored on the capacitor is Q1 = C*V1. Then you disconnect the ground connection and in it's place you connect it to a voltage source with voltage V2 < V1. Now the capacitor begins to charge up again until the voltage across it is V1, the charge added to the capacitor is C*(V1-V2). Now you disconnect both voltage sources from the capacitor and reconnect the one end of the cap to ground. The voltage across the capacitor is now 2V1-V2, and since V1 > V2, 2V1-V2 > V1. So in essence you have increased your voltage above the original source V1.

    Maybe you could post a schematic of the circuit you are talking about?
     
  3. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    :) hi haditya,

    am attaching an article about voltage doubler :)
     
  4. haditya

    Thread Starter Senior Member

    Jan 19, 2004
    220
    0
    :huh: :unsure:
    i guess i'll need more info on that
     
Loading...