Switched mode power supply in detail

The UPS is a device that provides emergency power source to equipment when the main power is cut off. It is also referred to as backup batteries. However, UPS are technically different from batteries since its output is AC rather than DC. Normally the main use of a UPS is to give the user enough time to save his/her work, in cases of computers; or to provide some allowance while waiting for the generator sets to turn on.
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