Rectification can be achieved by using a single diode or group of diodes. These diodes which convert the AC current into DC current are called rectifiers. Rectifiers are generally classified into two types: half wave rectifier and full wave rectifier. A half wave rectifier uses only a single diode to convert AC to DC.
So it is very easy to construct the half wave rectifier. However, a single diode in half wave rectifier only allows either a positive half cycle or a negative half cycle of the input AC signal and the remaining half cycle of the input AC signal is blocked. As a result, a large amount of power is wasted.
Furthermore, the half wave rectifiers are not suitable in the applications which need a steady and smooth DC voltage. So the half wave rectifiers are not efficient AC to DC converters.
We can easily overcome this drawback by using another type of rectifier known as a full wave rectifier. The full wave rectifier has some basic advantages over the half wave rectifier.
The average DC output voltage produced by the full wave rectifier is higher than the half wave rectifier. Furthermore, the DC output signal of the full wave rectifier has fewer ripples than the half wave rectifier. As a result, we get a smoother output DC voltage. A full wave rectifier is a type of rectifier which converts both half cycles of the AC signal into pulsating DC signal.
As shown in the above figure, the full wave rectifier converts both positive and negative half cycles of the input AC signal into output pulsating DC signal. The full wave rectifier is further classified into two types: center tapped full wave rectifier and full wave bridge rectifier. In this tutorial, center tapped full wave rectifier is explained. Because the center tapped transformer plays a key role in the center tapped full wave rectifier. When an additional wire is connected across the exact middle of the secondary winding of a transformer, it is known as a center tapped transformer.
The wire is adjusted in such a way that it falls in the exact middle point of the secondary winding. So the wire is exactly at zero volts of the AC signal. This wire is known as the center tap. The center tapped transformer works almost similar to a normal transformer. Like a normal transformer, the center tapped transformer also increases or reduces the AC voltage. However, a center tapped transformer has another important feature. That is the secondary winding of the center tapped transformer divides the input AC current or AC signal V P into two parts.
The upper part of the secondary winding produces a positive voltage V 1 and the lower part of the secondary winding produces a negative voltage V 2. When we combine these two voltages at output load, we get a complete AC signal. The voltages V 1 and V 2 are equal in magnitude but opposite in direction. That is the voltages V 1 and V 2 produced by the upper part and lower part of the secondary winding are degrees out of phase with each other.
However, by using a full wave rectifier with center tapped transformer, we can produce the voltages that are in phase with each other.
In simple words, by using a full wave rectifier with center tapped transformer, we can produce a current that flows only in single direction.
A center tapped full wave rectifier is a type of rectifier which uses a center tapped transformer and two diodes to convert the complete AC signal into DC signal. The center tapped full wave rectifier is made up of an AC source, a center tapped transformer, two diodes, and a load resistor. The AC source is connected to the primary winding of the center tapped transformer.
A center tap additional wire connected at the exact middle of the the secondary winding divides the input voltage into two parts.
The upper part of the secondary winding is connected to the diode D 1 and the lower part of the secondary winding is connected to the diode D 2. Both diode D 1 and diode D 2 are connected to a common load R L with the help of a center tap transformer. The center tap is generally considered as the ground point or the zero voltage reference point. The center tapped full wave rectifier uses a center tapped transformer to convert the input AC voltage into output DC voltage.
In a center-tapped transformer the peak inverse voltage is twice as in bridge rectifier hence this transformer is commonly used in full wave rectifier circuits. The operation and theory behind a Center tapped transformer is very similar to a normal secondary transformer. A primary voltage will be induced in the primary coil I1 and I3 and due to magnetic induction the voltage will be transferred to the secondary coil. Here in the secondary coil of a centre tapped transformer, there will be an additional wire T2 which will be placed exactly at the center of the secondary coil, hence the voltage here will always be zero.
If this wire is ignored and voltage across T1 and T2 is considered then we will get a voltage of 24V AC. This feature is very useful for the function of a full wave rectifier. Let us consider the voltage given by the first half of the secondary coil as Va and the voltage across the second half of the secondary coil as Vb as shown in the diagram below. Which scheme will be better?
How to calculate T. F of a full wave rectifier uaing centre taped transformer. I want full calculation. You seem to get this right earlier in your comments. There are in fact 3 different circuits from the centre-tapped transformer. This is typical of North American distribution systems, where there are two V circuits, and one V circuit two live conductors, one neutral conductor.
The V circuit is made up of the summation of the two V circuits. Yes, the V circuits are opposite in polarity, but if you were to measure between the two live conductors Vtotal you would have V and in phase with Va. This is easily shown using basic circuit theory. Some poor soul is going to read your comments and end up electrocuting themselves. To the public community — this goes to show that the only way to receive a proper education in Electrical Engineering is to attend a real university.
How about you try showing this with phase angles and prove your comments through equations? Prove that Vtotal is the summation of Va with Vb using example voltages. What would happen if the neutral conductor is broken? I know all the answers to this because I am actually an Electrical Engineer specialising in power system protection. It is a respectable profession and we take pride in our work, because mistakes can result in death.
You can reach us by mail. I am also a EE. I need two voltages from a centre tapped transformer. I built a bridge rectifier and got volts with reasonably little ripple after filtering.
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