Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1997-05-23
1999-09-07
Brown, Glenn W.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
324434, 320134, 320136, 320161, G01N 27416, G01R 3136, H01M 1044
Patent
active
059492333
ABSTRACT:
Instability and oscillation are avoided in an overcharge/overdischarge control circuit by providing comparators with sufficient gain to minimize leakage current penetration into control circuitry when an output of a comparator used for comparing the output voltage of a secondary cell with a reference voltage is at an intermediate level. An overcharging/overdischarging detection circuit with two secondary cells connected in series has voltage dividing resistors connected in parallel therewith for producing a divided output voltage for each secondary cell, the divided output voltages each being supplied to a respective comparator. A first comparator has an input stage comprising N-channel MOS devices. A second comparator has an input stage comprising P-channel MOS devices. The comparator outputs have a first value when the secondary cell is not in one of an overcharged and an overdischarged state, a second value when the secondary cell is in one of an overcharged and an overdischarged state, and an intermediate value when the secondary cell is between a normal state and one of an overcharged and an overdischarged state. The large gains of the comparators prevent the intermediate value from causing undesired current penetration and the instability associated therewith.
REFERENCES:
patent: 5530336 (1996-06-01), Eguchi et al.
Brown Glenn W.
Seiko Instruments Inc.
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