| 摘要 |
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.
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