Uninterruptible Power Supply (UPS) is a battery-powered device that allows computers to run for a short period of time when the primary power source fails; it also protects against power surges. Many cloud services depend on these systems for power availability because earlier UPS designs used a transformer to help raise low incoming voltages. However, as people become more aware of the need for energy efficiency and the necessity to minimize additional system losses, transformerless UPS systems are becoming more popular.
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