Diode Bridge Simulation

Diode bridge full wave rectifier is given in figure bellow.

Simulate: Diode bridge full wave rectifier.

diode-bridge

Diodes in Graetz bridge commutate input AC signal. Actually, for 80% of time all four diodes are reverse biased (cut off).

During positive half period of input AC voltage, diodes D1 and D3 are reverse biased, and diode D2 and D4 starts to be forward biased only when input AC voltage is at least 2·0.6V higher then output DC voltage. During this short period of time, current I1 starts to rush, and have high peak value. Equivalent circuit is given in Figure bellow.

diode-bridge_plus

During negative half period of input AC voltage, diodes D2 and D4 are reverse biased, and diode D1 and D3 starts to be forward biased only when rectified input AC voltage is at least 2·0.6V higher then output DC voltage. Again during this short period of time, current I1 starts to rush, and have high peak value. Equivalent circuit is given in Figure bellow.

diode-bridge-minus

Power network is transferring power to the load only for this short time. These short but power current pulses are high energy stress for power network. This is reason why for power loads higher then 60W, PFC is a must.

Go to Diode bridge full wave rectifier simulation.

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