Block diagram DC power supplyTransformer Rectifier Filter Regulator D C Revision 01 2
RectificationRectification is the process by whichan alternating voltage or current ischanged to a unidirectional (one way)voltage or current.
The AC SinewavePeak voltage = √2 x V rms = 1.414 x V rms
An AC voltage is defined as a voltage that periodically reversespolarity and will cause current to flow in the reverse direction. A DC voltage is a voltage that does not reverse direction, and causes current to flow in one direction only.When an AC voltage is measured with a voltmeter, the indicated value will be the RMS value (V rms = 0.707 x V peak) or (V rms = V peak) of the waveform) √2 When a DC voltage is measured, the meter will indicate the average of the DC voltage waveform.
Single phase half wave AC Supply Load+ +- TIME - TIME Revision 01 6
Half Wave Single Phase RectificationV load = V average = 0.318 x V peak or 0 .45 x V rms fr = fs PIV = √ 2 x V rms V ripple = √ 2 x V rms
Center tapped full wave Load AC Supply+- TIME + - TIME Revision 01 8
Full Wave Single Phase RectificationV load = V average = 0.638 x V peak or 0 .9 x V rms fr = 2 x fs PIV = √ 2 x V rms (bridge rectifier) PIV = √ 2 x (2 x V rms) (centre tapped rectifier) V ripple = √ 2 x V rms
Single phase bridge rectifier + AC Supply - D D2 TIME+ 1- D3 D4 TIME Load Revision 01 10
Printed circuit boardCables Tracks - DC SupplyAC Supply DC terminals AC terminal s Revision 01 11