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US 4,680,528 AGranted
Battery charging device
AssigneeToko, Inc.
InventorsToshio Mikami, Yasuo Nagasawa
Life of this patent
Estimating the term…
Abstract
A battery charging device which is so designed that whether or not the battery is connected in position can be detected by utilizing a current detecting circuit instead of a mechanically-structured component, such as a switch.
Claims2
A battery charging device, comprising:
- a DC power source, output terminals for a battery, and a charging-starter switch connected between said DC power source and said output terminals so as to provide DC power at the output terminals by turning on the charging-starter switch;
- a current detecting circuit connected to the output terminals for detecting whether or not a battery is connnected to the output terminals and for detecting a current flowing to the battery;
- a voltage control circuit responsive to a signal derived from said current detecting circuit to provide a charging voltage or stand-by voltage of a predetermined magnitude at the output terminals;
- and
- a current control circuit responsive to said signal to charge the battery with a current of a predetermined magnitude;
- said current detecting circuit being OR-connected to said voltage control circuit and to said current control circuit.
3 more elements
Dependencies are inferred from the claim text.