Peco Ii, Inc.

Jomahip, LLC

Nynex Corporation

C & D Charter Power Systems, Inc.

Joseph M McAndrews

Richard H Jones

William B Brecht

David Oscar Feder

Allan J Williamson

A DC power plant system is provided utilizing battery back up for emergency power for use with telephone switching equipment or other loads, whereby the system provides for a more efficient use of the DC rectifiers and allows a standby emergency power source to be sized to fit only the actual load rectifiers which will reduce the cost of the emergency standby power system.

Spare bus power plant

An automatic back-up battery management system utilizing primary DC power for telephone switching equipment, communications equipment, computer equipment or other loads.

Automatic battery charging system for a battery back-up DC power supply

An apparatus for controllably charging and discharging individual battery cells or groups of battery cells in a string of batteries employed as a back-up power supply is provided. The apparatus comprises an isolation circuit for at least partially isolating the battery string from the load bus and primary supply; a switching network including at least two controlled switches arranged to selectively form circuits for discharging one or more cells; and a logic circuit for selecting which of the cells will be discharged. In certain disclosed embodiments, the logic circuit and switching network combine to apportion charging current to individual battery cells or groups of cells in accordance with their charging needs.

Back-up battery management apparatus for charging and testing individual

The disclosure generally concerns a battery management system for a back-up battery for an uninterruptible primary DC source for telephone switching equipment or other loads. The battery management system includes variable isolation impedance means having high reverse impedance and variable forward impedance connected in series with the battery for effectively electrically isolating the battery from the system load bus without loss of battery back-up capability. Control means responsive to one or more predetermined system load bus and battery conditions and parameters adjusts the forward impedance of the impedance means between a relatively higher impedance level or levels effective to isolate said battery from the system load bus and a relatively lower forward impedance level or levels effective to connect the battery to the system load bus. During recharge of the battery after an emergency discharge into the load, the control means maintains the forward impedance of the variable impedance means at a normally lower level until the charging current falls to a predetermined charging current level, and then adjusts the forward impedance of the variable impedance means to a relatively higher level to isolate the battery from the primary DC supply voltage.

Back-up battery management system for a DC power supply

A back-up battery system for a switching equipment load in a telephone central office wherein the back-up battery system includes one or more rechargeable batteries having cells floated at a given float voltage and of a number such that when the batteries are switched in circuit across the load, the voltage of the batteries exceeds a minimum load voltage for a preselected period, and further being of a number such that the float voltage of the batteries exceeds a maximum load voltage.

Rechargeable back-up battery system including a number of battery cells

In a device for providing stand-by power to an electrical apparatus, such as a telephone switching system, the battery contained therein is maintained at a positive plate polarization of about 20 to 40 millivolts per cell.

Growing community of inventors

Freeport, NY, United States of America

Joseph M McAndrews