Battery energy balance circuit and battery charging bypass...

Details Battery energy balance circuit and battery charging bypass... Battery energy balance circuit and battery charging bypass...

2006-05-23

2006-05-23

Tibbits, Pia (Department: 2838)

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

Having variable number of cells or batteries in series

C320S116000

Reexamination Certificate

active

07049791

ABSTRACT:
A battery energy balance circuit and a battery charging bypass circuit is disclosed for batteries being charged at the same time to be charged equally. When the terminal voltages of the batteries are different, a controllable power device switch in the circuit switches on and off at a high frequency in order to reduce the input current to the batteries with higher terminal voltages and to increase the input current to the batteries with lower terminal voltages, achieving the goal of equal charging. The disclosed energy balance circuit can avoid damages to the batteries as a result of overcharging. When the number of batteries increases, one can expand the system in a modularized way to prevent inconvenience of circuit designs.

REFERENCES:
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patent: 5666041 (1997-09-01), Stuart et al.
patent: 5982143 (1999-11-01), Stuart
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patent: 6150795 (2000-11-01), Kutkut et al.
patent: 6222344 (2001-04-01), Peterson et al.
patent: 6356055 (2002-03-01), Lin et al.

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