Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Patent
1998-04-20
1999-11-02
Tso, Edward H.
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
320DIG21, H01M 1044, H01M 1046
Patent
active
059777508
ABSTRACT:
An apparatus and method for initiating an intelligent battery discharge in an electrical system thereby allowing battery diagnostic testing to be performed more efficiently and more accurately. Specifically, the discharge is initiated by reducing the voltage being supplied to the electrical system by a main power supply such that the battery power supply begins supplying the system voltage. The output of the main power supply is only reduced to a predetermined non-zero level, such that the battery power supply will begin discharging while the main power supply continues to maintain a floor voltage. This floor voltage ensures that the system voltage will not fall below the floor voltage even if the battery power supply fails completely. Once the battery power supply begins discharging, the system voltage is monitored to determine whether the battery power supply is capable of supplying sufficient electrical power to maintain the system voltage above the floor voltage. If after a certain time the system voltage supplied by the battery power supply remains above the floor voltage, the voltage supplied by the main power supply is further reduced to allow for a deeper discharge of the battery power supply. The battery discharge is terminated either when the system voltage reaches a certain voltage level or once enough time has passed to obtain sufficient battery parameters in order to determine the condition of the battery power supply. The battery discharge is terminated by increasing the voltage supplied by the main power supply back to a normal voltage level for the electrical system, thus removing the need for the battery power supply to continue supplying the system voltage.
REFERENCES:
patent: 4876513 (1989-10-01), Brilmyer et al.
patent: 5444378 (1995-08-01), Rogers
patent: 5631540 (1997-05-01), Nguyen
Herbert A. S.
Ng Patrick Kwok-Yeung
Turner Gary Jay
Lucent Technologies - Inc.
Tso Edward H.
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