Overvoltage protection

Details Overvoltage protection Overvoltage protection

2011-06-28

2011-06-28

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S162000

Reexamination Certificate

active

07969119

ABSTRACT:
An overvoltage protection system capable of maintaining a high setting voltage of a battery charger while guaranteeing that cell voltage does not exceed a value limited by a threshold value. In one preferred embodiment, a battery set is a plurality of series-connected battery cells. A protection voltage measurement portion measures a cell voltage of each battery cell. A computation portion calculates an open circuit voltage of the battery set outputs a calculated voltage as a measurement voltage. An overvoltage setting portion stops charging of battery set when the value of the cell voltage of any one of the battery cells reaches a threshold value. A diagnostic voltage measurement portion measures an open circuit voltage of battery set to output measured voltage as a diagnostic voltage. A comparing circuit stops charging of the battery set based on comparison results of value of the measurement voltage and value of diagnostic voltage.

REFERENCES:
patent: 6222346 (2001-04-01), Mori
patent: 6642694 (2003-11-01), Yamanaka et al.
patent: 7397221 (2008-07-01), Sakuma et al.
patent: 2002/0000790 (2002-01-01), Sano et al.
patent: 11-252809 (1999-09-01), None
patent: 2000-166107 (2000-06-01), None
patent: 2005-323459 (2005-11-01), None

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