| 摘要 |
According to one aspect of the invention, an uninterruptible power supply includes UPS circuitry, a power source adapted to couple to the UPS circuitry, a first contact, a second contact, and a third contact. The first contact, the second contact, and the third contact are adapted to couple the UPS circuitry to the power source. In a first stage of connection of the UPS circuitry and the power source, the first contact and the second contact are employed in a first circuit. In a second stage of connection of the UPS circuitry and the power source, the first contact and the third contact are employed in a second circuit, and the second contact and the third contact are employed in a third circuit.
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