04667143 is referenced by 152 patents and cites 12 patents.

A battery charging circuit is disclosed which rapidly charges a battery from some level of discharge, including fully discharged, to fully charged without endangering the battery. The charging circuit includes a control circuit which provides switching type regulation responsive to current, voltage and temperature signals from the battery, and also a timer circuit for automatically halting the charging current to a defective battery. The control circuit receives a temperature compensated voltage signal (TCVS) which is useful for effectively implementing a charging program which includes a low constant current mode, a high constant current mode, and a constant voltage mode. The TCVS is generated by connecting a thermistor responsive to battery temperature in parallel with one resistor of a resistive voltage divider network which is connected across the battery terminals. The output of the thus modified voltage divider network when plotted against temperature is a nonlinear curve which, with proper selection of ohmic values for the resistors and thermistor, corresponds to a temperature/voltage relationship for the battery which is known from experimental results to be effective for charging the battery.

Title
Battery charger having temperature compensated charge rate
Application Number
6/812204
Publication Number
4667143
Application Date
December 23, 1985
Publication Date
May 19, 1987
Inventor
Fred T Klein
Tulsa
OK, US
Craig L Cooper
Bartlesville
OK, US
Agent
George E Bogatie
Assignee
Phillips Petroleum Company
OK, US
IPC
H02J 7/04
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