Charge Pump

Discussion in 'Homework Help' started by Steve1992, Apr 30, 2011.

  1. Steve1992

    Thread Starter Senior Member

    Apr 7, 2006
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    0
    Hi,

    Is this an example of the principle of a charge pump?
     
  2. justtrying

    Active Member

    Mar 9, 2011
    329
    352
    it is very basic, only how would it charge to 12V if there is no potential difference. (6V on one end and 6V on the other). Best examples are found by looking at power supplies - capacitors are used as voltage multiplier.
     
  3. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    I think that the lower left power supply is meant to be -6V, a minor typo.
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    No, he is correct. A simple diode, either Schottky or Germanium, to prevent the 12V on the capacitor from discharging would be beneficial, at the loss of some voltage.

    The OP is charging the capacitor to 6V, then putting the 6V in series with the power supply. This will result in a short pulse, as the cap discharges through the power supply.

    Here is a practical application of such a setup...

    CMOS 555 Long Duration Blue LED Flasher
     
  5. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    The circuit shown is the basic(very basic) principal behind a 'high side' mosfet driver.
     
  6. Georacer

    Moderator

    Nov 25, 2009
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    Ok, now I see it. Thanks for that, Bill.
     
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