Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1993-06-29
1995-07-11
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 40, 320 43, H02J 704
Patent
active
054324262
ABSTRACT:
A control section detects terminal voltage of a battery periodically and stores it in a memory, then calculates the most recent gradient and average gradient of a charging curve from the storage contents. When the most recent gradient becomes greater than the average gradient by a predetermined value or more, the control section judges it to be the last stage of the charging. After this, the control section compares the most recent terminal voltage with the preceding terminal voltage which are detected and stored in sequence. When they become equal to each other, the control section turns off a charge switch for terminating the charging. Thus, a rise in the terminal voltage at the last stage of the charging is detected securely and the subsequent peak is detected accurately.
REFERENCES:
patent: 4388582 (1983-06-01), Saar et al.
patent: 4392101 (1983-07-01), Saar et al.
patent: 4503378 (1985-03-01), Jones et al.
patent: 4639655 (1987-01-01), Westhaver et al.
patent: 4746852 (1988-05-01), Martin
patent: 5166623 (1992-11-01), Ganio
patent: 5268630 (1993-12-01), Bhagwat et al.
Nappi Robert
Sanyo Electric Co,. Ltd.
Stephan Steven L.
LandOfFree
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