Bridge rectifier and symmetric power supply

In summary, a bridge rectifier is a circuit that converts AC voltage to DC voltage using four diodes in a specific arrangement. It works by allowing current to flow in only one direction at a time, resulting in a pulsating DC output. A center tap transformer is used in conjunction with a bridge rectifier to provide a symmetric power supply, meaning it produces both positive and negative voltages. This is achieved by using two full wave rectifiers and charging capacitors to 1.414 times the half voltage of the transformer. A diagram can be helpful in understanding the working of these components.
  • #1
anonymoussome
59
0
Could some one explain how a bridge rectifier works with a diagram and its mathematics?


Also please explain how a center tap transformer and a bridge rectifier are used to provide a symmetric power supply.
I have the Ckt Diagram for that but I cannot understand its working.

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thanks in advance!
 
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  • #2
The normal bridge works as shown in the attached diagram. Red diodes are conducting. Just follow the arrows and look at the polarity.
The capacitor will charge up to 1.414 times the full secondary voltage.

normal bridge.PNG


The Symmetric one gives negative and positive voltages.
If you look at it as two full wave rectifiers, it will make more sense.

See attached diagram.

Each capacitor will charge up to 1.414 times half the transformer secondary voltage

bridge.PNG
 
Last edited:
  • #3
thanks pal !
 

FAQ: Bridge rectifier and symmetric power supply

1. What is a bridge rectifier?

A bridge rectifier is an electronic circuit that is used to convert alternating current (AC) to direct current (DC). It consists of diodes arranged in a bridge configuration and is commonly used in power supplies.

2. How does a bridge rectifier work?

A bridge rectifier works by using four diodes to convert the AC input into a pulsating DC output. The diodes are arranged in a bridge configuration, where two diodes are connected to each end of the AC input and two diodes are connected to the output. This allows the current to flow in one direction, resulting in a DC output.

3. What is the purpose of a symmetric power supply?

A symmetric power supply is used to provide a balanced positive and negative DC voltage output. This is necessary for powering electronic circuits that require both positive and negative voltage, such as audio amplifiers and operational amplifiers.

4. How is a symmetric power supply different from a regular power supply?

A regular power supply typically only provides a positive DC voltage output, while a symmetric power supply provides both positive and negative DC voltage outputs. This allows for a wider range of applications and more precise control over the voltage levels.

5. What are the advantages of using a bridge rectifier and symmetric power supply?

The use of a bridge rectifier and symmetric power supply allows for a more efficient and stable conversion of AC to DC power. It also provides a balanced power output, which is necessary for certain electronic circuits. Additionally, it can be more cost-effective compared to using separate power supplies for positive and negative voltage outputs.

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