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Capacitive power supply having charge equalization circuit

  • US 5,063,340 A
  • Filed: 10/25/1990
  • Issued: 11/05/1991
  • Est. Priority Date: 10/25/1990
  • Status: Expired due to Term
First Claim
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1. A portable, rechargeable power supply forming a power source of pre-defined characteristics for powering a load element when coupled thereto, said power supply having:

  • means forming a first conductive surface comprised of a conductive material for collecting and storing electrical charge responsive to application of a charging current thereto;

    means forming a second conductive surface comprised of a conductive material and spaced-apart from the first conductive surface whereby a potential difference is formed between the first conductive surface and the second conductive surface when electrical charge is stored upon the first conductive surface, said first conductive surface and said second conductive surface spaced-apart therefrom together being of a low electrical resistance to minimize, thereby, resistive loss across the first and second conductive surfaces, respectively, during discharge of the electrical charge stored upon the first conductive surface to power the load element when coupled thereto;

    a transistor network formed of at least one transistor having a first terminal connected to the first conductive surface and a second terminal connected to the second conductive surface; and

    means for biasing the transistor to vary conductive characteristics thereof such that the transistor forms a shunt for reducing levels of the charging current applied to the first conductive surface when the potential difference formed between the first conductive surface and the second conductive surface is beyond a pre-determined value.

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