Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1986-11-14
1988-12-20
Hickey, R. J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 22, 320 31, 320 39, H02J 704
Patent
active
047927437
ABSTRACT:
A battery charging device including a series transistor inserted between a source circuit and a battery, and a comparison circuit which compares the voltage at the terminal of the battery and the voltage of an output of the source circuit so as to turn off the series transistor when the terminal voltage is higher than the output voltage, whereby, when the terminal voltage of the battery becomes higher than the output voltage of the source circuit at the time of an interruption of supply of power, the series transistor is brought into the off-state to prevent the battery from being discharged. The charging device further includes circuits for connecting a plurality of batteries successively to the source circuit for charging, switching control circuit means for operating said connecting circuits sequentially upon detection of a battery fully-charged state or short-circuited battery condition, and timing circuits for controlling the time of connection of short-circuit detection circuits and for temporarily prohibiting operation of the switching control circuit so that each of a total short-circuited condition, a partial short-circuited condition, and an over-discharged condition of a battery can be identified and the switching control circuit can be caused to appropriately operate or not operate in response to each condition.
REFERENCES:
patent: 4061956 (1977-12-01), Brown et al.
patent: 4291266 (1981-09-01), Portmann
patent: 4313078 (1982-01-01), Bilsky et al.
patent: 4387332 (1983-06-01), Oyamada et al.
patent: 4583035 (1986-04-01), Sloan
Koyabu Seiji
Tsujino Kazuhiro
Hickey R. J.
Sanyo Electric Co,. Ltd.
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