Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1981-01-19
1983-07-19
Pellinen, A. D.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
323278, 323902, 340636, H02J 710, G01R 19165
Patent
active
043946135
ABSTRACT:
A full-charge indicator for battery chargers, includes a transistor which is in a conductive state as long as charging current to the battery is not less than a level which indicates that the battery did not reach full charge. When the battery reaches full charge, a voltage drop in a resistor in the charging current path is not sufficient to maintain the transistor in a conducting state, and therefore it is switched off. When this occurs an LED is turned on, to indicate a full charge state of the battery. A photocoupler together with a photocoupler transistor are included. When the transistor is off, the photocoupler activates the photocoupler transistor to shunt out a resistor, thereby reducing the charging current to the battery to a float charging current and prevent the battery from being overcharged and damaged.
REFERENCES:
patent: 3336519 (1967-08-01), Grimm
patent: 3517295 (1970-06-01), Lapuyade
patent: 3553561 (1971-01-01), Lesher
patent: 3611017 (1971-10-01), Freeland
patent: 3863130 (1975-01-01), Yamaoka et al.
patent: 3909702 (1975-09-01), Hart
patent: 3930198 (1975-12-01), Williamson
patent: 4056765 (1977-11-01), Scheidler et al.
patent: 4243929 (1981-01-01), Lenart
Owen, "Battery State Indicator", Practical Electronics, vol. 14, No. 5, Nov. 1978, p. 8, S90380037.
California Institute of Technology
Pellinen A. D.
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