Method and apparatus for determining the complex impedance of an electrical component
First Claim
1. A method of determining the complex impedance spectrum of a circuit component comprising the steps of:
- applying an input signal to the component comprising a fixed duration of a plurality of discrete frequencies simultaneously; and
determining the complex impedance of the component at each of the frequencies using a discrete demodulation technique on two complex impedance related parameters at each of the discrete frequencies;
wherein none of the discrete frequencies is an integer multiple of any other of the discrete frequencies, and wherein none of the discrete frequencies is a sum of any other two of the discrete frequencies.
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Abstract
The invention provides a method and apparatus for determining the complex impedance of an electrical component. The method comprises the steps of applying an input signal to the component comprising a plurality of discrete frequencies simultaneously, and determining the complex impedance of the component at each of the frequencies using a discrete demodulation technique on two complex impedance related parameters at each of the discrete frequencies. This method is particularly useful in electrically noisy environments and can be used to determine the impedance and equivalent circuit parameters for a battery. It can also be applied to battery system interconnects to enable battery system currents to be determined.
29 Citations
30 Claims
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1. A method of determining the complex impedance spectrum of a circuit component comprising the steps of:
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applying an input signal to the component comprising a fixed duration of a plurality of discrete frequencies simultaneously; and
determining the complex impedance of the component at each of the frequencies using a discrete demodulation technique on two complex impedance related parameters at each of the discrete frequencies;
wherein none of the discrete frequencies is an integer multiple of any other of the discrete frequencies, and wherein none of the discrete frequencies is a sum of any other two of the discrete frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 26, 27, 28)
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13. A circuit component impedance tester comprising:
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signal generation means for applying an input signal, comprising a fixed duration of a plurality of discrete frequencies simultaneously, across the component;
sensing means for detecting two impedance related parameters from the component; and
,processing means for demodulating the measured impedance related parameters at each of the discrete frequencies;
wherein none of the discrete frequencies is an integer multiple of any other of the discrete frequencies, and wherein none of the discrete frequencies is a sum of any other two of the discrete frequencies. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 29, 30)
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Specification