Soláthar Cumhachta Mód Athraigh (SMP), Ar a dtugtar soláthar cumhachta mód lasc nó tiontaire lasc freisin, is gléas comhshó fuinnimh leictreach ardmhinicíochta é agus cineál soláthair cumhachta. Is é an fheidhm atá aige ná voltas beacht a thiontú isteach sa voltas nó sa sruth a theastaíonn ón úsáideoir trí fhoirmeacha éagsúla ailtireachta. The input of a switching power supply is mostly an AC power supply (such as mains power) or a DC power supply, while the output is mostly a device that requires a DC power supply, such as a personal computer, and the switching power supply converts the voltage and current between the two.