| 摘要 |
Current overload protection is provided for an inverter of an uninterruptible power supply system; a shutdown circuit responds when a current overload is present, and a plurality of at least three comparators having different input threshold and different time delays at their respective outputs operate such that when an extreme overload occurs, the inverter will be shut down immediately, whereas it will be shut down after predetermined longer periods with correspondingly lesser amounts of current overload present.
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