Battery charging system
First Claim
1. In combination with an AC voltage source, a charging circuit for a plurality of storage batteries interconnected in series at intermediate junctions between end terminals of opposite polarity, said charging circuit having a plurality of voltage converters respectively connected to said batteries and switching control means operatively connected to the voltage converters for controlling the charging of the batteries through the voltage converters, the improvement comprising jumper means connected to the intermediate junctions for interconnecting the voltage converters in series with each other and in parallel to the respective batteries, said voltage converters including current rectifiers and transformer means having a plurality of secondary windings respectively coupled exclusively to said current rectifiers and primary windings connected to the switching control means, at least one AC load, a power distributor operatively connecting the source to the load and the charging circuit, a voltage inverter operatively connecting the power distributor to the batteries, and firing control means connected to the batteries and the inverter for establishing a predetermined wave shape with respect to voltage applied from the batteries to the power distributor.
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Accused Products
Abstract
A bank of storage batteries is maintained in a fully charged state by a charging circuit coupled by a controlled, battery energized inverter to AC load lines to which the charging circuit and an AC source are connected. Charging current is controlled in accordance with the load current in the load lines through the primary windings of transformers in the charging circuit and applied to the batteries at a voltage level slightly higher than the full standby battery voltage. Application of full battery voltage to the AC load lines is delayed during a timed start-up period.
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Citations
19 Claims
- 1. In combination with an AC voltage source, a charging circuit for a plurality of storage batteries interconnected in series at intermediate junctions between end terminals of opposite polarity, said charging circuit having a plurality of voltage converters respectively connected to said batteries and switching control means operatively connected to the voltage converters for controlling the charging of the batteries through the voltage converters, the improvement comprising jumper means connected to the intermediate junctions for interconnecting the voltage converters in series with each other and in parallel to the respective batteries, said voltage converters including current rectifiers and transformer means having a plurality of secondary windings respectively coupled exclusively to said current rectifiers and primary windings connected to the switching control means, at least one AC load, a power distributor operatively connecting the source to the load and the charging circuit, a voltage inverter operatively connecting the power distributor to the batteries, and firing control means connected to the batteries and the inverter for establishing a predetermined wave shape with respect to voltage applied from the batteries to the power distributor.
- 15. In combination with an AC voltage source, a charging circuit for a plurality of storage batteries interconnected in series at intermediate junctions between end terminals of opposite polarity, said charging circuit having a plurality of voltage converters respectively connected to said batteries, said voltage converters including current rectifiers and transformer means having a plurality of secondary windings respectively coupled exclusively to said current rectifiers and primary windings operatively connected to the source, control means operatively connected to the primary windings for controlling the charging of the batteries through the voltage converters from the source, said control means comprising a signal controlled switch device interconnecting the source and the primary windings, pulse generating means connected to the source for producing control signals, and means responsive to said control signals for controlling operation of the signal controlled switch device, at least one AC load connected to the source and current sensing means responsive to load current drawn by the AC load for varying the pulse rate of the control signals produced by the pulse generating means.
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19. In combination with an AC voltage source, a charging circuit for a plurality of storage batteries interconnected in series at intermediate junctions between end terminals of opposite polarity, said charging circuit having a plurality of voltage converters respectively connected to said batteries, said voltage converters including current rectifiers and transformer means having a plurality of secondary windings respectively coupled exclusively to said current rectifiers and primary windings operatively connected to the source, control means operatively connected to the primary windings for controlling the charging of the batteries through the voltage converters from the source, timer means connected to one of the end terminals and one of the intermediate junctions of the batteries for establishing a start-up timing cycle of predetermined duration, and relay means responsive to termination of said timing cycle for coupling the other of the end terminals of the batteries to the AC load.
Specification