All About Rectifier & Rectifier Reviews

When we look at the entire system of power supply, we come to know the importance of the rectifier section that is meant to convert the incoming AC (Alternating Current) from a transformer or other ac power source to some form of pulsating DC (Direct Current). It holds current that flows in both directions, but rectifier modifies so that the output current flows only in one direction.

Half-Wave Rectifiers. A pragmatic way to convert ac to pulsating dc is to simply allow half of the ac cycle to pass, while blocking current to prevent it from flowing during the other half cycle. When the AC input is negative, the diode is reverse-biased and the diode does not pass any current through. Such circuits are known as half-wave rectifiers because they only work on half of the incoming ac wave.

The output of a full-wave rectifier. Full-Wave Rectifiers. The more common approach is to manipulate the incoming ac wave so that both halves are used to cause output current to flow in the same direction. Diodes are arranged so that both the positive and negative parts of the AC waveform are converted to DC. Such circuits operate on the entire incoming ac wave, they are known as full-wave rectifiers.

Importance of Rectifier Design in UPS plays vital role:
It determines input supply window
It maintains input Power Factor presented to the supply
It controls Harmonics injected to the supply
It determines Generator size
It maintains & manages Batteries in top conditions
Rectifier Technologies
The 'Q' parameters which shall help us in comparing the rectifier performances are
Operating window for input supply voltage
Power Factor presented to input supply
Current Harmonics injected in to the supply
Efficiency
Input Power Factor & Input Current Harmonic Distortion are the significant parameters.
Pf & Thdi are the characteristics of load connected.
These parameters can not be improved unless the nature of current is corrected to Sine wave.
Very importantly these parameters must be maintained over the actual Power Condition available at site. For example.
Input Voltage variation
Frequency variation
Load variation

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