Programmable current exciter for measuring AC immittance of cells and batteries

  • US 6,621,272 B2
  • Filed: 10/15/2002
  • Issued: 09/16/2003
  • Est. Priority Date: 10/12/2001
  • Status: Active Grant
  • ×
    • Pin Icon | RPX Insight
    • Pin
First Claim
Patent Images

1. Apparatus for passing a periodic time-varying current at a particular measurement frequency through an electrochemical cell or battery comprising:

  • an auxiliary dc power supply contacting a first terminal of said cell or battery and adapted to inject current into said cell or battery in the charging direction;

    a resistor contacting a second terminal of said cell or battery and adapted to conduct current through said cell or battery in either the charging direction or the discharging direction;

    a pair of complementary transistors connected in series across said auxiliary dc power supply and arranged to conduct current through said resistor in either the charging direction or the discharging direction;

    an operational amplifier arranged to sense the voltage across said resistor at an inverting input and to control conduction of said complementary transistors; and

    , a signal source delivering a periodic control signal at said measurement frequency to a noninverting input of said operational amplifier.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×