All about rectification you need to know

• Rectification is the process of converting the alternating voltage or current into the corresponding direct (dc) quantity. (Direct voltage or current)
• The input to a rectifier is ac whereas its output is unidirectional or dc.
• The electronic circuit which carries out rectification is called as rectifier.
• The block diagram of rectifier is as shown in fig.
• A step down xmer is used to reduce the ac mains voltage to an adequately small value.
• The terms ratio of the xmer is adjusted to obtained a stepped down as voltage.
• This voltage is converted into a pulsating dc voltage by the rectifier.

Need of Rectification

• Every electronic circuit such as amplifiers needs a dc power for its operation.
• This dc voltage has been obtained from the ac supply.
• For this the ac supply voltage has to be reduced (stepped down) first using a step down xmer and then converted to dc by using rectifier.

Polarities of Transformer Voltages

Single phase Ac supply voltage.

• The primary of xmer is connected to the single phase ac supply available from MSEB. This supply voltage has two terminals namely live and neutral. The voltage at live terminal with respect to neutral is sinusoidal.
• The positive half cycle extends from wt=0 to ∏ radians. In this half cycle live (L) is positive with respect to neutral (N) and the secondary voltage VAB is positive.
• The negative half cycle extends form wt=0 to 2∏ radians “L” is negative with respect to “N” and secondary voltage VAB in negative.

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