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Switched-mode power supply applications
Switched-mode power supplies have applications in various areas. A switched-mode supply is chosen for an application when its weight, efficiency, size, or wide input range tolerance make it preferable to linear power supplies. Initially the cost of semiconductors made switch-mode supplies a premium cost alternative, but current production switch-mode supplies are nearly always lower in cost than the equivalent linear power supply.
== Personal computers ==
Switched-mode PSUs in domestic products such as personal computers often have universal inputs, meaning that they can accept power from most mains electricity throughout the world, with rated frequencies in the range and a voltage range between (although a manual voltage range switch may be required). In practice they will operate from a much wider frequency range and often from a DC supply as well.
Most modern desktop and laptop computers also have a voltage regulator module which is a DC-DC converter on the motherboard that step down the voltage from the power supply or the battery to the CPU core voltage, which may need to be as low as for a low voltage CPU to for a desktop CPU as of 2007. Some motherboards have a setting in the BIOS that allows overclockers to set a new CPU core voltage; other motherboards support dynamic voltage scaling which constantly adjust the CPU core voltage. Most laptop computers also have a DC-AC converter to step up the voltage from the battery to drive the cold cathode backlight in the flat-screen monitor, which typically requires around .〔; How to Backlight an LCD〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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