US 4,233,553 AGranted

Automatic dual mode battery charger

AssigneeAult Incorporated

InventorsLuther T. Prince, Jr., Wilbur J. Hampel, Michael A. Boot

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Abstract

This invention relates to automatic dual mode battery charging circuit which includes rectifying means and an adjustable voltage rectifier energized by the rectifying means and providing an output to a battery to be charged. The circuit includes a voltage controller connected to the voltage regulator means to set the level of voltage output from the voltage regulator and hence the charging current to the battery. The voltage regulating means provides two modes of operation, namely, a fast charge and a float mode of operation. A current detector connecting in series circuit with the voltage regulator and the battery provides a means for detecting current flow through the battery and controls the operation of the voltage controller, to change the output of the voltage regulating means between the two modes of operation.

Claims9

Dependent claims

An automatic dual mode battery charging circuit comprising, rectifying means adapted to be connected to an alternating current source of power, an adjustable voltage regulator connected to said rectifying means and having an output circuit adapted to be connected to a battery to be charged;

a voltage controller connected to the voltage regulating means to set the level of voltage output of the voltage regulating means between two modes of operation, said voltage controller including a pair of parallel selectively connected variable resistance circuits, each of which has a separate adjustable resistor to adjust the current output of the voltage regulator for each of the two modes of operation, each circuit of which is connected to an input of the voltage regulator;
and current detector means connected between the rectifying means and the battery and sensing charging current flowing through the battery, said current detector means being connected to the voltage controller to change the operation of the voltage regulating means between the two modes of operation.

Dependencies are inferred from the claim text.