Bridge Rectifier

Posted by AJ × 00:11

Full-wave Rectifiers Bridge

Working :

• For the positive half of the AC cycle:

• Diode D1 and D2 gets forward biased and conducts

Working :

• For the negative half of the AC cycle

• Diode D3 and D4 gets forward biased and conducts during this half cycle.

Details of working of FWR

• We initially consider the diodes to be ideal, such that VC =0 and Rf =0

• The four-diode bridge can be bought as a package During positive half cycles vi is

positive.

• Current is conducted through diodes D1, resistor R and diode D2

• Meanwhile diodes D3 and D4 are reverse biased

• During negative half cycles vi is negative.

• Current is conducted through diodes D3, resistor R and diode D4

• Meanwhile diodes D1 and D2 are reverse biased.

• Current always flows the same way through the load R.

• the average d.c. value of this full-wave-rectified sine wave is VAV = 2VM/p (i.e. twice

the half-wave value)

• Two diodes are in the conduction path.

• Thus in the case of non-ideal diodes vowill be lower than vi by 2VC.

• As for the half-wave rectifier a reservoir capacitor can be used. In the full wave case

the discharge time is T/2 and

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