| 摘要 |
In an uninterruptible power supply, during the discharge of a battery 1 to a load 3, the current induced by the load and passing through the battery is measured e or calculated c, and the corresponding AC ripple voltage component produced on the battery voltage is measured a, the value for the internal impedance of the battery being calculated from these values in a computer 9. The obtained impedance value is compared to a predetermined reference value to determine the condition of the battery, and an alarm and/or shutdown signal d is produced if the reference value is exceeded. The system also includes an inverter 10 and battery charger 7. <IMAGE>
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