Bridge Rectifier Full Wave:
A bridge rectifier uses four diodes for the process of rectification. Two diodes for each half cycle are conducting i.e. They are forward biased and the other two diodes for this half cycle are reversed biased i.e. they are non-conducting. Let’s see Bridge Rectifier Full Wave Working in detail.
What is the Bridge Rectifier ?
Bridge Rectifiers are the circuits which convert alternating current (AC) into direct current (DC) using the diodes arranged in the bridge circuit configuration. They usually comprise of four or more number of diodes which cause the output generated to be of the same polarity irrespective of the polarity at the input.
Circuit Diagram Bridge Rectifier
Bridge Rectifier Full Wave Working
- Bridge rectifier composed of four diodes D1, D2, D3 and D4 in which the input is supplied across two terminals A and B in the figure while the output is collected across the load resistor RL connected between the terminals C and D.
- For the positive half of the input the diodes D2 and D4 are forward biased and conducting while D1 and D3 are non-conducting.
- For the second half i.e. negative half of cycle the diodes D1 and D3 are conducting while D2 and D4 are reversed biased and non-conducting.
Bridge Rectifier Full Wave – Positive Half Cycle:
- Now consider the case wherein the positive pulse appears at the AC input i.e. the terminal A is positive while the terminal B is negative.
- This causes the diodes D1 and D3 to get forward biased and at the same time, the diodes D2 and D4 will be reverse biased. As a result, the current flows along the short-circuited path created by the diodes D1 and D3 (considering the diodes to be ideal).
- Thus the voltage developed across the load resistor RL will be positive towards the end connected to terminal D and negative at the end connected to the terminal C.
Negative Half Cycle of Bridge Rectifier Full Wave:
- Next if the negative pulse appears at the AC input, then the terminals A and B are negative and positive respectively.
- This forward biases the diodes D2 and D4, while reverse biasing D1 and D3 which causes the current to flow in the direction.
- At this instant, one has to note that the polarity of the voltage developed across RL is identical to that produced when the incoming AC pulse was positive in nature. This means that for both positive and negative pulse, the output of the bridge rectifier will be identical in polarity as shown by the wave forms
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