Battery charging circuit for maintaining a substantially constan

Details Battery charging circuit for maintaining a substantially constan Battery charging circuit for maintaining a substantially constan

1981-02-03

1983-12-20

Beha, Jr., William H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 32, 363 19, 363 37, 363142, H02J 710

Patent

active

044220324

ABSTRACT:
A battery charger includes a transistor inverter. The transistor inverter includes an oscillation transformer and a switching transistor for controlling a current flowing through a primary coil of the oscillation transformer. This current charges the battery when the transistor is on. While the switching transistor is in an off state, charging current is supplied to the battery from a secondary coil of the oscillation transformer. The period of time where the switching transistor is in an on state is controlled depending on the amplitude of a supply voltage. Accordingly, the average value of a charging current to the rechargeable battery is automatically kept substantially constant despite variations in the amplitude of the alternating current voltage supply.

REFERENCES:
patent: 3435320 (1969-03-01), Lee et al.
patent: 3869657 (1975-03-01), Shoji et al.
patent: 4021717 (1977-05-01), Furuishi et al.
patent: 4172276 (1979-10-01), Kameya
patent: 4187536 (1980-01-01), Govaert
Electrical Design News, vol. 15, No. 2, pp. 65-67, Jan. 1970.

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