题目内容
Power Supplies are electronic circuits designed to convert AC ( Alternating Current ) to DC ( Direct Current ) at any desired level.
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A power supply can be broken down into a series of blocks: transformer, rectifier, filter, and voltage regulator, each of which performs a particular function.
The transformer can convert AC electricity from one voltage to another with little loss of power. Most power supplies use a step-down transformer to reduce the high AC mains voltage ( 230V or 110V ) to a safer low AC voltage .
The rectifier uses the ability of a diode to conduct during one half cycle of AC to convert AC to DC. A single diode rectifier only uses the positive half part of the AC wave to produce a half-wave varying DC.
A bridge rectifier uses four diodes connected in a bridge network to produce a full-wave varying DC output .
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