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Fast capacitance measurement

  • US 6,191,723 B1
  • Filed: 07/22/1999
  • Issued: 02/20/2001
  • Est. Priority Date: 07/22/1999
  • Status: Expired due to Term
First Claim
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1. A method for measuring capacitance, comprising:

  • charging a capacitor at a linear rate by applying a predetermined constant current thereto, and discharging said capacitor at an exponential rate;

    selecting a charge time and a discharge time for said capacitor such that a first incremental voltage developed from a first peak voltage to a second peak voltage during said charge time and a second incremental voltage developed from said second peak voltage to said first peak voltage during said discharge time are equal, said first and second incremental voltages being within the range of a measurement analog-to-digital converter;

    measuring said first incremental voltage; and

    calculating a capacitance value by multiplying said predetermined constant current by said charge time and dividing by said first incremental voltage.

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