Showing posts with label Electrical Circuits. Show all posts
Showing posts with label Electrical Circuits. Show all posts

Wednesday, November 7, 2018

November 07, 2018

Bipolar Output Full Wave Bridge Rectifier with Center Tapped Transformer.

Full Wave Bridge Rectifier with Center Tapped Transformer.


Today we are going to know Full Wave Bridge Rectifier with Center Tapped Transformer and also Full Wave Rectifier Circuit Diagram. Let's start from the basics of Rectifier.

 Are you know What is Rectifier? A rectifier is a Circuit which converts Alternating Current(AC) into Direct Current(DC).

There are mainly two types of the rectifier

 (1) Half-Wave Rectifier
(2) Full-Wave rectifier

 A Half-Wave rectifier circuit can be made by using one PN Junction Diode.

 A Full Wave Rectifier circuit can be made by the following two way-
  1. Using Two PN Junction Diode and a Center Tapped Transformer.
  2. Using Four PN Junction Diodes and a normal transformer.
Today our main topic is Full-Wave Rectifier with Center Tapped Transformer. But if you do not know how to make half-wave and Full-wave rectifier which are mentioned above I will help you. So before going to our main topic Let's see the below Circuit Diagrams.


Half-Wave rectifier circuit Using one PN Junction Diode:




Half-Wave rectifier. Half-Wave rectifier circuit. half wave rectifier diagram. half wave rectifier pdf.half wave rectifier working






Full Wave Rectifier circuit Using Two PN Junction Diode and a Center Tapped Transformer:





full wave rectifier. full wave rectifier circuit. full wave rectifier circuit diagram.full wave rectifier with capacitor filter. full wave rectifier centre tapped transformer.







Read Also:





Full Wave Rectifier circuit Using Four PN Junction Diodes and a Step-Down Transformer:



Full Wave Bridge Rectifier.full wave rectifier circuit.full wave rectifier. full wave rectifier capacitor filter.full wave rectifier project.




Now Let's go to know our main Topic. You can see the Full-Wave Rectifier Circuits which are shown above have the Unipolar output that means they can only give Positive Voltage Supply.

 Actually, to get Bipolar Output(Positive and Negative both voltage supply) we need to make Full Wave Bridge Rectifier Circuit with Center Tapped Transformer.

 Now you may have a question in your mind why we need both positive and negative both power supply? The answer is in analog circuits many components are there which required both positive and negative both power supply like Operational Amplifier and many others.

 Full Wave Bridge Rectifier Circuit with Center Tapped Transformer:



Full Wave Bridge Rectifier Circuit with Center Tapped Transformer. Full Wave Rectifier.full wave rectifier circuit. full wave rectifier project.full wave rectifier capacitor filter.




As you see in the above diagram we have taken a center tapped transformer of 6V - 0 -6V rating. We will get +6V voltage across the 'A' and 'C' terminals and we will get -6V voltage across 'B' and 'C' terminals and the +12V voltage across the 'A' and 'B' terminals.
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Saturday, November 3, 2018

November 03, 2018

Transformerless Power Supply. Why Transformerless Power Supply not Safe?

All about Transformerless Power Supply.



Transformerless Power supply: Today we are going to know about Transformerless Power Supply. Nowadays in many electrical and electronic equipment which are low cost, they have a Transformerless power supply system. In this article, I have tried to give you the knowledge about Transformerless Power Supply.

What is Transformerless Power Supply?

All electrical and electronic equipment which we used in our daily life need electric power. There are many products we used which are operated in very small DC voltage like 6V DC, 12V DC etc. But in our home 230V, AC supply is given. So a power supply system is installed in our electrical equipment which Steps Down the voltage as the requirement and then converted into DC. In the early days, a Step Down Transformer is installed for Step Down the voltage but nowadays no transformer is installed. A different type of power supply system is there which described below. So this type of Power Supply System is called Transformerless Power Supply.



Why Transformerless Power Supply become popular?

  • It has a very low cost.
  • It required a very small area for installation.
  • It gives sufficient efficiency.
  • It has a low power loss.



How Transformerless Power Supply works?

The circuit diagram of a simple Transformerless Power Supply is given below. 

What is Transformerless Power Supply?How Transformerless Power Supply works? Ho to make Transformerless Power Supply. Transformerless Power Supply circuit diagram.


As you see in the circuit diagram The Transformerless Power Supply has a series non-polarized capacitor(225J,400V). This capacitor drops the voltage and gives the low output voltage. Now you may say that why we used a series Capacitor, not a Resistor as the Resistor also can drop the voltage. I will say you that as the Resistor losses power (I2R) so we cannot use the resistor.

A 1 mega ohm Resistor is connected across the capacitor because as the capacitor is charged by 230V so it is very dangerous for us. So for discharge the capacitor we used a resistor across it.

A Full bridge rectifier circuit using IN4007 diodes is used for convert AC to DC. A 25V, 470 microfarads polarized capacitor is used to remove the ripple factor. 

In the above circuit diagram, the rating of the Zener diode is not given because you can use a Zener Diode of any rating according to your required output voltage. For example, If your required output voltage is 12V then you can use a 12V Zener Diode.


Read also:






Why Transformerless Power Supply is not Safe?

Transformerless Power Supply is not safe for us because when it is on no load then no current flowing through the circuit, therefore, no voltage drop in the capacitor. So when we touch the circuit we will get an electric shock.


What is Transformerless Power Supply?How Transformerless Power Supply works? Ho to make Transformerless Power Supply. Transformerless Power Supply circuit diagram.






The transformerless Power Supply inside an emergency Light:

Here a Transformerless Power Supply circuit inside an Emergency Light is shown below.
Here the circuit is installed on a PCB with SMD resistors, capacitors.




What is Transformerless Power Supply?How Transformerless Power Supply works? Ho to make Transformerless Power Supply. Transformerless Power Supply circuit diagram.








How to Make Transformerless Power Supply?

You can make easily a Transformerless Power Supply in your home. Use the circuit diagram which is given in the "How Transformerless Power Supply works?". The apparatus which are required for making Transformerless Power Supply is also given in the above circuit diagram. So see the circuit diagram carefully and make the circuit.



Read also:


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