What is Switching power supplies

Switching power supplies, switched mode power supply, SMPS, is basically an electronic power unit that has a switching regulator. Why we need a switching regulator? The switch mode power supply quickly switches a power transistor between on and off. What is the advantage of this? The main advantage of SMPS is that the switching transistor dissipates little power in the full on phase and the off state. Other advantage is that smaller size and lighter weight (high frequency transformers which have a light weight) and lower heat generation due to higher efficiency.

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