1
Keith S Champlin: Method and apparatus for electronically evaluating the internal temperature of an electrochemical cell or battery. Westman Champlin & Kelly P A, September 25, 2001: US06294897 (223 worldwide citation)

A testing device applies time-varying electrical excitation to a cell or battery and senses the resulting time-varying electrical response. Computation circuitry within the device uses voltage and current signals derived from the excitation and response signals as inputs and computes values of eleme ...


2
Keith S Champlin: Electronic tester for assessing battery/cell capacity. Kinney & Lange, August 18, 1992: US05140269 (182 worldwide citation)

A self-contained electronic device instantaneously assesses the stored energy capacity of single, two-volt, lead-acid cells; or of batteries comprised of such cells. The testing device is electrically connected to the terminals of a cell or battery and measures its dynamic conductance with a small, ...


3
Keith S Champlin: Method and apparatus for suppressing time-varying signals in batteries undergoing charging or discharging. August 30, 1994: US05343380 (173 worldwide citation)

An electronic device for effectively preventing time-varying current from passing through an electro-chemical cell or battery is disclosed. Time-varying current flowing in a circuit which includes the cell/battery is sensed externally to the cell/battery with a magnetically-coupled ac current probe ...


4
Keith S Champlin: Electronic battery testing device. Dorsey & Whitney, March 28, 1989: US04816768 (170 worldwide citation)

An improved self-contained electronic device for testing storage batteries and other dc sources is disclosed. The testing device accurately performs small-signal measurements of the battery's dynamic conductance and provides for displaying either a numerical reading proportional to the battery's ava ...


5
Keith S Champlin: Electronic battery testing device. Westman Champlin & Kelly P A, November 5, 1996: US05572136 (167 worldwide citation)

An electronic device for testing storage batteries and other dc sources is disclosed. The testing device passes a small, time-varying, current through the battery and observes the resulting time-varying voltage response. This response is then digitized and inputted to a microprocessor. In one embodi ...


6
Keith S Champlin: Electronic battery testing device with state-of-charge compensation. Dorsey & Whitney, March 27, 1990: US04912416 (162 worldwide citation)

A self-contained electronic device for testing storage batteries that may be partially discharged is disclosed. The testing device performs small-signal measurements of the battery's dynamic conductance and provides either a proportional numerical readout, displayed in appropriate battery measuring ...


7
Keith S Champlin: Electric battery testing device with automatic voltage scaling to determine dynamic conductance. Dorsey & Whitney, November 14, 1989: US04881038 (155 worldwide citation)

A self-contained electronic device for testing disparate storage batteries having any one of a fixed plurality of possible nominal voltages is disclosed. The testing device performs small-signal measurements of a battery's dynamic conductance and provides either a proportional numerical readout, dis ...


8
Keith S Champlin: Method and apparatus for determining battery properties from complex impedance/admittance. Westman Champlin & Kelly P A, March 14, 2000: US06037777 (154 worldwide citation)

A device includes a microprocessor or microcontroller and measures real and imaginary parts of complex immittance of a cell or battery at n discrete frequencies, where n is an integer number equal to or greater than 2. The device determines cell/battery properties by evaluating components of an equi ...


9
Keith S Champlin: Electronic battery testing device with automatic voltage scaling. Dorsey & Whitney, April 25, 1989: US04825170 (152 worldwide citation)

A self-contained electronic device for testing disparate storage batteries having any one of a fixed plurality of possible nominal voltages is disclosed. The testing device performs small-signal measurements of a battery's dynamic conductance and provides either a proportional numerical readout, dis ...


10
Stephen J McShane, Kevin I Bertness, Keith S Champlin: Electronic battery tester with tailored compensation for low state-of charge. Midtronics, Westman Champlin & Kelly P A, October 13, 1998: US05821756 (148 worldwide citation)

Various embodiments of an improved electronic device for testing or monitoring storage batteries that may be only partially charged are disclosed. The device determines the battery's small-signal dynamic conductance in order to provide either a proportional numerical readout, displayed in appropriat ...