Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1996-05-29
1998-07-07
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 22, 307 64, 307 66, H02J 700, H02J 704
Patent
active
057774544
ABSTRACT:
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.
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Jones Richard H.
McAndrews Joseph M.
Peco II, Inc.
Shin K.
Wong Peter S.
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