semiconductor physics.pdf

# The only advantage of bridge rectifier over center

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The rectifier efficiency of a bridge rectifier is almost equal to the center tapped full wave rectifier. The only advantage of bridge rectifier over center tapped full wave rectifier is the reduction in cost. In bridge rectifier, instead of using the center-tapped transformer, four diodes are used. Now we get an idea about the three types of rectifiers. The half wave rectifier and the center tapped full wave rectifier (full wave rectifier) are already discussed in the previous tutorials. This tutorial is mainly focused on the bridge rectifier. Let’s take a look at the bridge rectifier …! Bridge rectifier definition A bridge rectifier is a type of full wave rectifier which uses four or morediodes in a bridge circuit configuration to efficiently convert the Alternating Current (AC) into Direct Current (DC). Bridge rectifier construction The construction diagram of a bridge rectifier is shown in the below figure. The bridge rectifier is made up of four diodes namely D 1 , D 2 , D 3 , D 4 and load resistor R L . The four diodes are connected in a closed loop (Bridge) configuration to efficiently convert the Alternating Current (AC) into Direct Current (DC). The main advantage of this bridge circuit configuration is that we do not require an expensive center tapped transformer, thereby reducing its cost and size.

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111 The input AC signal is applied across two terminals A and B and the output DC signal is obtained across the load resistor R L which is connected between the terminals C and D. The four diodes D 1 , D 2 , D 3 , D 4 are arranged in series with only two diodes allowing electric current during each half cycle. For example, diodes D 1 and D 3 are considered as one pair which allows electric current during the positive half cycle whereas diodes D 2 and D 4 are considered as another pair which allows electric current during the negative half cycle of the input AC signal. How bridge rectifier works? When input AC signal is applied across the bridge rectifier, during the positive half cycle diodes D 1 and D 3 are forward biased and allows electric current while the diodes D 2 and D 4 are reverse biased and blocks electric current. On the other hand, during the negative half cycle diodes D 2 and D 4 are forward biased and allows electric current while diodes D 1 and D 3 are reverse biased and blocks electric current. During the positive half cycle, the terminal A becomes positive while the terminal B becomes negative. This causes the diodes D 1 and D 3 forward biased and at the same time, it causes the diodes D 2 and D 4 reverse biased. The current flow direction during the positive half cycle is shown in the figure A (I.e. A to D to C to B).
112 During the negative half cycle, the terminal B becomes positive while the terminal A becomes negative. This causes the diodes D 2 and D 4 forward biased and at the same time, it causes the diodes D 1 and D 3 reverse biased.

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• Winter '15
• P-n junction, p-n junction diode, free electrons, P-type semiconductor

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