Electricity: battery or capacitor charging or discharging – Battery or cell charging – With thermal condition detection
Patent
1996-09-05
1998-04-28
Tso, Edward
Electricity: battery or capacitor charging or discharging
Battery or cell charging
With thermal condition detection
H01M 1046
Patent
active
057449392
ABSTRACT:
A monitoring circuit for a Li-Ion battery pack charging apparatus is disclosed. The monitoring circuit modifies charging time for a Li-Ion battery pack inserted in the charging apparatus to compensate for temperature effects on the charging current input to the battery pack. In one embodiment of the monitoring circuit, a comparator is utilized to compare a voltage across the battery pack, V.sub.charge, to a set point voltage value, V.sub.sp. The set point voltage value, V.sub.sp, is taken off a temperature sensor circuit comprising a voltage divider circuit. The voltage divider circuit includes at least one thermistor in a ground connected leg of the divider. In a second embodiment of the monitoring circuit of the present invention, a differential amplifier is coupled to opposite ends of a low resistance sensor resistor. The sensor resistor is coupled between charging circuitry and the Li-Ion battery pack to be charged. The voltage differential across the resistor, V.sub.sensor, is amplified by a gain of the differential amplifier. A gain adjusted differential voltage, V.sub.gsensor, is compared by a microprocessor to a set point voltage value, V.sub.sp. The set point voltage value, V.sub.sp, is generated by a temperature sensor circuit. The temperature sensor circuit includes a voltage divider circuit and the set point voltage value, V.sub.sp, is taken off the voltage divider which includes at least one thermistor in a ground connected leg of the divider.
REFERENCES:
patent: 3852652 (1974-12-01), Jasinski
patent: 3867681 (1975-02-01), Bishop et al.
patent: 3895283 (1975-07-01), Peterson
patent: 4433277 (1984-02-01), Carollo et al.
patent: 4727306 (1988-02-01), Misak et al.
patent: 5057762 (1991-10-01), Goedken et al.
patent: 5121047 (1992-06-01), Goedken et al.
patent: 5122722 (1992-06-01), Goedken et al.
patent: 5166596 (1992-11-01), Goedken
patent: 5180962 (1993-01-01), Giancaterino et al.
patent: 5343137 (1994-08-01), Kitaoka et al.
patent: 5561361 (1996-10-01), Sangupta et al.
Sixteen page product specification No. LT1511 published by Linear Technology, Constant-Current/Constant-Voltage 3A Battery Charger with Input Current Limiting, published Oct., 1995.
Telxon Corp.
Tso Edward
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