초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] A battery management system for a battery connected to a load bus wherein the load bus is further connected to a primary DC source, comprising:variable isolation impedance means having high reverse impedance and variable forward impedance connected in circuit with said ba

[ What is claimed is:] [1.] A battery management system for a battery connected to a load bus wherein the load bus is further connected to a primary DC source, comprising:variable isolation impedance means having high reverse impedance and variable forward impedance connected in circuit with said battery for electrically isolating said battery from said system load bus without loss of battery back-up capability;control means coupled to the variable isolation impedance means for controlling the forward impedance of the variable isolation impedance means in dependence upon a sensed condition; and,a shunt and connecting means responsive to said control means for selectively connecting said shunt across said variable impedance means to selectively connect said battery to said load bus.