SMPS are usually used instead of direct linear power supply units. Without a SMPS, your laptop computer would be fried instantly when you would try to plug it into an outlet with a different voltage than found in the US (110V). The circuit moves extremely fast regulating the current so that it can stabilize it to a set voltage that is then sent directly to the device. Most power converters are usually called Switched Mode Power Supplies (SMPS) they include a power supply unit and a circuit inside the unit to regulate the current. If you have any type of sophisticated electronics such as computers, laptops, high end audio equipment, cell phones etc, the odds are they also incorporate a power supply unit that also regulates the current. A power converter is a power supply unit (PSU) that not only delivers energy to an electronic device from an electrical outlet, but also regulates the current to meet the devices specific requirements.
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