Charge Pump and switched capacitor circuit

Discussion in 'General Electronics Chat' started by mishra87, May 13, 2016.

  1. mishra87

    Thread Starter Member

    Jan 17, 2016
    166
    2
    Can anybody explain me charge pump and switched capacitor circuit and its application type !!!
     
  2. HW-nut

    Member

    May 12, 2016
    45
    11
    I have used switched capacitor charge pumps in many designs for a low current negative supply. Converting +5v to -5v for example.

    Only one ic is required.

    In operation, an oscillator drives some analog switches that toggle between the input and output of the supply. The capacitor is first connected to the input (+5v) an then switched to the output of the supply except with the positive side of the switched capacitor connected to ground. The negative side of the capacitor is switched to the negative side of the supplies output. This results in a negative output voltage. An output capacitor is used to hold the charge up during the switch cycles.

    Switched capacitor designs are also used for filters, this is much more involved.
     
    mishra87 likes this.
  3. mishra87

    Thread Starter Member

    Jan 17, 2016
    166
    2
    Thanks for your reply !!!
    I also want to know that is there any difference between switched capacitor and charge pump circuit.
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,646
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    mishra87 likes this.
  5. mishra87

    Thread Starter Member

    Jan 17, 2016
    166
    2
    Thank you so much !!!
     
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