Rechargeable battery system
First Claim
1. A rechargeable electric battery comprising a casing with external terminals of standard dry-battery dimensions, one or more nickel-cadmium cells positioned within said casing and a constant-current charging unit positioned within said casing and connected to the cell or cells, said constant-current charging unit comprising a first terminal means for a.c. external supply, a step-down transformer having primary and secondary windings, said primary winding connected to said first terminal means, a second terminal means for d.c. external supply, a first bridge rectifier, said secondary winding and second terminal means being connected to said rectifier, disconnecting means interconnecting said second terminal means and said secondary winding for disconnecting the said first terminal means when said second terminal means is used and a feedback circuit to maintain constant current charging.
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Accused Products
Abstract
A rechargeable battery comprises a casing (1) intended to fit into the space occupied by one or more dry batteries, the casing (1) containing one or more nickel cadmium cells (6), a charging unit (8) for the cells (6) and means (11) for connecting the charging unit (8) to a supply of electricity.
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Citations
12 Claims
- 1. A rechargeable electric battery comprising a casing with external terminals of standard dry-battery dimensions, one or more nickel-cadmium cells positioned within said casing and a constant-current charging unit positioned within said casing and connected to the cell or cells, said constant-current charging unit comprising a first terminal means for a.c. external supply, a step-down transformer having primary and secondary windings, said primary winding connected to said first terminal means, a second terminal means for d.c. external supply, a first bridge rectifier, said secondary winding and second terminal means being connected to said rectifier, disconnecting means interconnecting said second terminal means and said secondary winding for disconnecting the said first terminal means when said second terminal means is used and a feedback circuit to maintain constant current charging.
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12. A rechargeable electric battery comprising a casing with external terminals of standard dry-battery dimensions, one or more nickel-cadmium cells positioned within said casing and a constant-current charging unit positioned within said casing and connected to the cell or cells, said constant-current charging unit comprising a first terminal means for a.c. external supply, a step-down transformer having primary and secondary windings, said primary winding connected to said first terminal means, a second terminal means for d.c. external supply, a first bridge rectifier, said secondary winding being connected to said first rectifier, a second bridge rectifier, said first and second bridge rectifiers having d.c. outputs in parallel, an a.c. input of said first bridge rectifier being connected to said secondary winding of said step-down transformer, and an a.c. input of said second bridge rectifier being connected to said second terminal means, and a feedback circuit to maintain constant current charging.
Specification