METHOD AND APPARATUS FOR IN-SITU CHARACTERIZATION OF ENERGY STORAGE AND ENERGY CONVERSION DEVICES
First Claim
1. An apparatus for characterizing an energy-output device, comprising:
- a random noise generator configured for generating a random noise signal;
a current generator configured for generating a random noise stimulus that is correlated to the random noise signal and configured for operable coupling to an energy-output device terminal;
a current measurement device operably coupled to the random noise stimulus and configured for measuring the random noise stimulus to determine a measured noise stimulus;
a bias reducer operably coupled an average voltage signal and configured for operable coupling to the energy-output device terminal, the bias reducer configured for generating a bias-reduced response by substantially removing the average voltage signal offset from a voltage of the energy-output device terminal; and
an analyzer operably coupled to the measured noise stimulus and the bias-reduced response, the analyzer configured for correlating the measured noise stimulus and the bias-reduced response to determine an impedance of the energy-output device.
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Accused Products
Abstract
Disclosed are methods and apparatuses for determining an impedance of an energy-output device using a random noise stimulus applied to the energy-output device. A random noise signal is generated and converted to a random noise stimulus as a current source correlated to the random noise signal. A bias-reduced response of the energy-output device to the random noise stimulus is generated by comparing a voltage at the energy-output device terminal to an average voltage signal. The random noise stimulus and bias-reduced response may be periodically sampled to generate a time-varying current stimulus and a time-varying voltage response, which may be correlated to generate an autocorrelated stimulus, an autocorrelated response, and a cross correlated response. Finally, the autocorrelated stimulus, the autocorrelated response, and the cross correlated response may be combined to determine at least one of impedance amplitude, impedance phase, and complex impedance.
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Citations
30 Claims
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1. An apparatus for characterizing an energy-output device, comprising:
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a random noise generator configured for generating a random noise signal;
a current generator configured for generating a random noise stimulus that is correlated to the random noise signal and configured for operable coupling to an energy-output device terminal;
a current measurement device operably coupled to the random noise stimulus and configured for measuring the random noise stimulus to determine a measured noise stimulus;
a bias reducer operably coupled an average voltage signal and configured for operable coupling to the energy-output device terminal, the bias reducer configured for generating a bias-reduced response by substantially removing the average voltage signal offset from a voltage of the energy-output device terminal; and
an analyzer operably coupled to the measured noise stimulus and the bias-reduced response, the analyzer configured for correlating the measured noise stimulus and the bias-reduced response to determine an impedance of the energy-output device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of determining an impedance of an energy-output device, comprising:
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generating a random noise signal;
generating a random noise stimulus as a current source correlated to the random noise signal;
applying the random noise stimulus to an energy-output device terminal of the energy-output device;
measuring the random noise stimulus as a measured noise stimulus;
generating a bias-reduced response by comparing a voltage at the energy-output device terminal to an average voltage signal to substantially remove the average voltage signal offset from a voltage of the energy-output device terminal; and
correlating the measured noise stimulus and the bias-reduced response to determine the impedance of the energy-output device. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of determining an impedance of an energy-output device using a random noise stimulus applied to the energy-output device, the method comprising:
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periodically sampling the random noise stimulus to generate a time-varying current stimulus;
periodically sampling a voltage response of the energy-output device to the random noise stimulus to generate a time-varying voltage response;
autocorrelating the time-varying current stimulus to generate an autocorrelated stimulus;
autocorrelating the time-varying voltage response to generate an autocorrelated response;
cross-correlating the time-varying current stimulus and the time-varying voltage response to generate a cross correlated response; and
combining the autocorrelated stimulus, the autocorrelated response, and the cross correlated response to determine at least one of an impedance amplitude, an impedance phase, and a complex impedance. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification