The Main difference between a Switched Mode Power Supply and an Uninteruptable Power Supply is the function.
SMPS are like a conditioner of electricity supply for a building, house, etc.
UPS are the emergency backup power supply for vital computer based systems
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Switched mode power supply is used to lower 220/110 volt to lower level. But UPS gives power during a power shutdown.
The Main Difference Between UPS and SMPS is that SMPS uses high frequency Transformers while UPS uses low frequency transformers.