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Voltage control circuitry for charging ouput capacitor

  • US 6,799,070 B2
  • Filed: 01/23/2002
  • Issued: 09/28/2004
  • Est. Priority Date: 07/27/1999
  • Status: Expired due to Term
First Claim
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1. An apparatus for supplying a current pulse to a load impedance, said apparatus comprising;

  • a stimulator capacitor;

    an output current control device for selectively discharging said stimulator capacitor to produce an output current pulse through said load impedance;

    a battery supplying a battery voltage;

    voltage converter circuitry for producing an output voltage signal to charge said stimulator capacitor; and

    wherein said voltage converter circuitry comprises;

    a plurality of converter capacitors;

    a plurality of switches configured for directing charge from said battery to said converter capacitors in a first mode of operation and configured for directing charge from said converter capacitors to said stimulator capacitor in a second mode of operation;

    wherein the selection of switches in said first and second modes of operations determines a voltage multiplication factor;

    clock circuitry for periodically switching said switches from said first to said second modes of operation; and

    measurement circuitry for periodically adjusting said voltage multiplication factor in response to a voltage measured across said stimulator capacitor.

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