Galvanically isolated charge balance system

Details Galvanically isolated charge balance system Galvanically isolated charge balance system

2007-01-25

2009-11-03

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S136000, C320S166000

Reexamination Certificate

active

07612537

ABSTRACT:
A galvanically isolated charge balance system for a multicell battery includes a balancing circuit associated with each cell; each balancing circuit including a flying capacitor; a variable conductance switch; and a biasing circuit for the variable conductance switch; and a galvanically isolating MEMS switching device for selectively connecting the flying capacitor to a voltage supply to charge it to a predetermined voltage and to the biasing circuit for setting the variable conductance switch to adjust the charge on its associated cell to a preselected level.

REFERENCES:
patent: 4740966 (1988-04-01), Goad
patent: 6975193 (2005-12-01), Knieser et al.
patent: 2004/0135546 (2004-07-01), Chertok et al.
patent: 2006/0153495 (2006-07-01), Wynne et al.
Jung, Do Yang, “Shield Ultracapacitor Strings From Overvoltage Yet Maintain Efficiency”, Electronic Design Magazine, May 27, 2002, pp. 81-85.
“Cell balancing packs a punch”, CIS Magazine, Nov. 2003, pp. 27-30.
Intersil Preliminary Datasheet for X3100, X3101, Apr. 11, 2005.
Intersil Applications Note, “The Benefits of Cell Balancing”, Jul. 8, 2005, pp. 1-9.
Intersil Applications Note, Using Cell Balancing to Maximize the Capacity of Multi-cell Li-Ion Battery Packs, Jun. 7, 2005, pp. 1-8.

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