Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1984-11-19
1986-09-02
Salce, Patrick R.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 23, 320 35, 320 39, H02J 704
Patent
active
046098615
ABSTRACT:
A quick battery charger according to the present invention comprises a circuit for detecting the voltage of the battery (3), a constant-current charging circuit, a constant-voltage charging circuit, and a timer circuit responsive to the voltage detecting circuit. At the beginning in charging operation, the battery is charged at a constant current, and when the voltage of the battery exceeds a predetermined value, charging mode is changed to constant-voltage charging which last for a predetermined period of time determined by the timer circuit. The charger may also comprise a trickle charge circuit so that trickle charge takes place after the constant-voltage charge. One or more heat-sensitive elements (5, 6, 69) may be used for providing temperature compensation or fail-safe in response to the heat from the battery and heat from parts of the battery charger. As a timer may be used a capacitor (50) which may be forcibly charged to insure a given period of time of the constant-voltage charging. A differential amplifier (42) may be used for detecting the voltage of the battery so that a power transistor (13) used as an element of the constant-current charging circuit is controlled in response to an output signal from the differential amplifier (42) to perform constant-voltage charging.
REFERENCES:
patent: 3864617 (1975-02-01), Smith et al.
National Technical Report, vol. 27, No. 6, Dec. 1981, "Quick Charging Systems for Sealed Rechargeable Batteries", by Yoneji Koyama et al, pp. 144-152.
Inaniwa Masahiro
Ogawa Yoichi
Suzuki Shun
Ault Anita M.
Hitachi Koki Company Limited
Salce Patrick R.
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