Battery charger with automatic change from current to voltage mo

Details Battery charger with automatic change from current to voltage mo Battery charger with automatic change from current to voltage mo

1975-05-14

1977-04-19

Hickey, Robert J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 32, 320 39, 320 57, 320DIG2, H02J 704

Patent

active

040191117

ABSTRACT:
A pair of silicon controlled rectifiers are alternately triggered into their forward conductive states at points relatively early in each alternating current half cycle to provide a maximum charging current when a substantially discharged battery is to be recharged. As the charging process progresses, the battery voltage increases and at a predetermined value of the battery voltage a smooth transition from the current-controlled mode to a voltage-controlled mode is inaugurated. After the change to the voltage-controlled mode has been completed, the SCRs are triggered into conduction much later in each cycle, thereby furnishing a very low or trickle current which can be continued indefinitely without damage to the battery. Simple adjustments are provided for determining the maximum current charging rate and the particular voltage at which the changeover is to begin. Provision is also made for preventing an initial sudden current surge when first turning on the power, thereby avoiding any unnecessary blowing of fuses.

REFERENCES:
patent: 3376487 (1968-04-01), Bixby
patent: 3382425 (1968-05-01), Legatti
patent: 3392317 (1968-07-01), Eberts et al.
patent: 3517295 (1970-06-01), Lapuyade
patent: 3854082 (1974-12-01), Nasby et al.

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