![]() ![]() Figure (below) shows a positive half wave rectifier whereas a negative half wave rectifier would show the diode being reverse biased (facing the opposite way). It is the simplest rectifier as only one single diode is used. ![]() The half cycle can be either positive or negative. This allows half cycle of the AC input while blocking the other half cycle. Half wave rectifiers convert one half cycle on the AC input into pulsating DC output. Because of this, three phase rectifiers are more efficient and have more transformer utilisation factor. This is because they can deliver large amounts of power and do not require any additional filter to reduce ripple factor. Three phase is preferred when using large systems. Three phase rectifiers are used in place of single phase rectifiers to reduce ripple factor. Structures need three or six diodes and these are connected to each phase of the transformer secondary winding. Three phase rectifiers have an input of three phase AV power. A single phase rectifier uses only single phase of transformer secondary coil for the conversion and diodes are connected to the secondary winding of single phase transformer. This means that the single phase rectifier delivers a small amount of power and has less transformer utilisation factor (TUF). The structures are very simple, needing one, two or four diodes (dependent on the type of system). Single phase rectifiers have an input of one phase AC power. ![]()
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