Description

• This is an electrical device that supplies electric powerto anelectrical load.
• The primary function of a power supply is to convertelectric currentfrom a source to the correctvoltage,current, andfrequencyto power the load.
• As a result, power supplies are sometimes referred to aselectric power converters.
• Some power supplies are separate standalone pieces of equipment, while others are built into the load appliances that they power.
• Examples of the latter include power supplies found in desktop computers and consumer electronics devices.
• All power supplies have apower inputconnection, which receives energy in the form of electric current from a source, and one or morepower outputconnections that deliver current to the load.
• The source power may come from theelectric power grid, such as anelectrical outlet,energy storagedevices such asbatteriesorfuel cells,generatorsoralternators,solar powerconverters, or another power supply.
• The input and output are usually hardwired circuit connections, though some power supplies employ wireless energy transfer to power their loads without wired connections.
• This is AC to DC power supply.
• DC power supplies use AC mains electricityas an energy source.
• This power supply will employ a transformerto convert the input voltage to a higher or lower AC voltage.
• Arectifieris used to convert the transformer output voltage to a varying DC voltage, which in turn is passed through anelectronic filterto convert it to an unregulated DC voltage.