Importance

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Abstract

A battery charger for recharging nickel cadmium batteries includes trickle charge, fast charge and deep charge modes. A control circuit responsive to the terminal voltage of the battery includes a clock-driven mode control counter having counter states which condition power supply circuitry within the charger to the mode appropriate to the battery terminal voltage. The counter is conditioned to its deep discharge state by actuation of a user-accessible switch. When the terminal voltage falls below a first predetermined level, the counter automatically reverts from the discharge state to its fast charge state to establish the fast charge mode. When the terminal voltage rises above a second predetermined level, the counter automatically reverts to its trickle charge state to establish the trickle charge mode.

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First Claim