Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1995-10-17
1997-05-20
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 39, 324427, H02J 700
Patent
active
056315376
ABSTRACT:
A battery charger/protection device (10) is provided for charging a battery pack (12) comprised of four lithium ion cells. Each of the cells is selectively monitored by examining the voltage thereacross. An overvoltage condition is checked for a cell, an undervoltage condition for a cell is checked and an overcurrent condition for the entire battery pack (12) is checked. This is achieved by comparing the voltage with predetermined threshold voltages during the charging operation. This is a sequential operation wherein each of the batteries is sequentially examined in a continuous manner through the charging operation in accordance with a predetermined scheme. Switches (30) and (28) are provided for terminating a charging operation during charging. During operation, the undervoltage condition can be checked and the charger/protection device (10) placed in a sleep mode. The charger/protection device (10) provides a finite number of terminals for accessing any combination of cells. By connecting the terminals together for an unused cell, information about the cell across those two terminals can be nullified by indicating that no cell is present and that a short has been substituted for the cell, information about this cell then not utilized in the charging monitoring operation. This allows a single part to accommodate different batteries.
REFERENCES:
patent: 4238721 (1980-12-01), DeLuca et al.
patent: 4616170 (1986-10-01), Urstoger
patent: 5153496 (1992-10-01), LaForge
patent: 5206578 (1993-04-01), Nor
Benchmarq Microelectronics
Howison Gregory M.
Toatley , Jr. Gregory J.
Wong Peter S.
LandOfFree
Battery charge management/protection apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Battery charge management/protection apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Battery charge management/protection apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1726256