FULL WAVE BRIDGE RECTIFIER

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As shown in the given diagram of full wave bridge rectifier it consists of four diodes under the condition in which four diodes are connected the called bridge circuit. So due to this type of circuit is named bridge rectifier. A resistor is connected in the circuit whiere rectified output voltage appears called load resistor RL

Full wave bridge rectifier current path during negative input cycle

Full wave bridge rectifier current path during positive input cycle

Bridge rectifier output wave forms

Working of Bridge Rectifier

During the positive input half cycle terminal M of the secondary is positive and N is negative. Diode D1 and D3 becomes forward bias where as D2 and D4 are reversed bias. Hence the current flows along point M, E, A, B, C, F and N producing a drop across RL.

During the negative input half cycle secondary terminal N becomes positive and M is negative. Now D2 and D4 are forward bias and D1 and D3 are reversed bias. Now the current flows along points N, E, A, B, C, F and M. Hence we find that current keeps flowing through load resistance RL in the same direction (A, B). during both half cycles of the AC input the point A of the bridge rectifier always acts as an anode and point C as cathod. It frequency is twice that of supply frequency.

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