The correct answer is Switched Mode Power Supply.SMPS:The full form of SMPS is Switched Mode Power Supply also known as Switching Mode Power Supply.SMPS is an electronic power supply system that makes use of a switching regulator to transfer electrical power effectively.It is a PSU (power supply unit) and is usually used in computers to change the voltage to the appropriate range for the computer.An SMPS adjusts output voltage and current between different electrical configurations by switching the basics of typically lossless storage such as capacitors and inductors.Ideal switching concepts determined by transistors controlled outside of their active state that have no resistance when on and carry no current when off.It is the idea why switches with an ideal function will operate with 100% output, that is, all input energy is provided to the load; no power is wasted as dissipated heating.In fact, such ideal systems do not exist, which is why a switching power source can not be 100% proficient, but it is still a vital improvement in effectiveness over a linear regulator.Additional InformationBenefits of SMPS:The switch-mode power source is small in scale.The SMPS is very lightweight.SMPS power consumption is typically 60 to 70% which is ideal for use.SMPS is strongly anti-interference.The SMPS production range is large.Limitations of SMPS:The complexity of SMPS is very large.The production reflection is high and its control is weak in the case of SMPS.The use of SMPS can only be a step-down regulator.In SMPS, the voltage output is just one.