UPS Power Supply

Uninterruptible Power Supply (UPS) provides backup power when the flow of electricity stops or drops to an inadequate voltage. Backup power can be provided for a specific amount of time, so that generators can be activated or network components can be properly shut down. Three types of UPS systems to choose from are: standby, line interactive and online.

Standby UPS provides short-term power during outages. During an outage, an inverter converts battery power to useable power for attached devices. When the outage is resolved, the UPS switches back to AC power, recharging the battery. 

Line-interactive UPS protects devices from power outages, sags and surges, as well as under-voltage and over-voltage situations. In this design, the battery-to-AC power inverter is always connected to the output of the UPS. When the input AC power is normal, the inverter provides battery charging. Once the input power fails, the battery will provide power to the UPS output. This design offers additional filtering and reduces switching transients because the inverter is always on and connected to the output.

Online UPS accepts AC input, rectifies to DC for passing through the battery, then inverts back to 120 V/230 V AC for powering protected equipment. During a power failure, the rectifier will be bypassed and the battery will keep the power steady and unchanged.

UPS capacitors smooth out electrical voltage fluctuations. A typical UPS contains many different sizes and types of capacitors, some of which smooth out power supplied to the UPS processor and some that regulate the power that flows to the protected equipment.