Conditioning and charging circuit for nickel-cadmium batteries

Details Conditioning and charging circuit for nickel-cadmium batteries Conditioning and charging circuit for nickel-cadmium batteries

1990-11-19

1993-01-26

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 40, 320 48, H02J 700

Patent

active

051825090

ABSTRACT:
A conditioning and charging circuit for NiCd battries includes a switch for initially connecting the battery to a discharge resistor to discharge the battery. The battery voltage is monitored during the discharge. When the battery voltage falls to predetermined value, a timer is triggered and the switch is actuated to connect the battery to a charger. The charger charges the battery until the timer times out after a predetermined period, at which point charging is terminated. The predetermined period may be fixed, or it may be a function of ambient temperature. Thus, the battery is first discharged to a predetermined voltage and then charged for a predetermined period of time.

REFERENCES:
patent: 4609860 (1986-09-01), Fasen
patent: 4698579 (1987-10-01), Richter et al.
patent: 4902956 (1990-02-01), Sloan
An article from Cellular Business Magazine, Apr., 1989 titled Battery Charging: Extending Life & Capacity by Bob Williams.
A product brochure by Cadex Electronics, Inc. of Burnaby, British Columba, describing a Cadex Series C6000 Battery Analyzer, 1988.
Schwager, "Chargeur `Optimal` Pour Accu 9 V 6F22," Electronique Radio Plans, Paris, France, Mar. 1990, pp. 34, 36.
"Charging Unit for 4 NiCd Storage Batteries," Siemens Components XXII, Berlin and Munich, West Germany, Aug. 1987, p. 158.
Holdinghausen, "NiCad Piggy Bank," Elektor, Great Britain, Dec. 1980, pp. 12-13.

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