Why step down transformer is used in full wave rectifier?

Asked By: Aminul Beucke | Last Updated: 2nd May, 2020
Category: medical health thyroid disorders
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Working of Full Wave Bridge Rectifier Circuit. This bridge rectifier circuit works on a simple mechanism. A step-down transformer is used in order to step down or decrease the high voltage AC into low voltage AC. The transformer's secondary winding is connected to the opposite points of the bridge made up diodes.

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Keeping this in consideration, why we use step down transformer in full wave rectifier?

Transformer is a device which reduces or increases the AC voltage. In half wave rectifier, we generally use a step-down transformer because the voltage needed for the diode is very small. Applying a large AC voltage without using transformer will permanently destroy the diode.

Additionally, why do we use step down transformer? It is designed to reduce the voltage from the primary winding to the secondary winding. As a step-down unit, the transformer converts high-voltage, low-current power into low-voltage, high-current power. The larger-gauge wire used in the secondary winding is necessary due to the increase in current.

Just so, what is the role of transformer in full wave rectifier?

The center tapped full wave rectifier uses a center tapped transformer to convert the input AC voltage into output DC voltage. When input AC voltage is applied, the secondary winding of the center tapped transformer divides this input AC voltage into two parts: positive and negative.

Which transformer is used in bridge rectifier?

Working of the Bridge Rectifier Used to Convert 230V AC to 5V DC. Step-down transformers are used to convert 230V AC (high voltage) into 12V AC (low voltage).

36 Related Question Answers Found

How is AC converted to DC?

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification, since it "straightens" the direction of current.

What is the principle of full wave rectifier?

Principle of Full Wave Bridge Rectifier
During the positive half-cycle, the terminal 1 becomes positive, and terminal 2 becomes negative. This will cause the diodes A and C to become forward-biased, and the current will flow through it. Meanwhile diodes B and D will become reverse-biased and block current through them.

What are the applications of rectifier?

Some Applications of Rectifier Diode
  • Rectifying a voltage, such as turning the AC into DC voltages.
  • Isolating signals from a supply.
  • Voltage Reference.
  • Controlling the size of a signal.
  • Mixing signals.
  • Detection signals.
  • Lighting systems.
  • LASER diodes.

What are the disadvantages of full wave rectifier?

Disadvantages of full-wave rectifier:
  • More complected than half-wave rectifier.
  • It requires more diodes, two for center tap rectifier and four for bridge rectifier.
  • PIV rating of the diode is higher.
  • Higher PIV diodes are larger in size and too much costlier.
  • The cost of the center tap transformer is high.

What is the efficiency of full wave rectifier?


The maximum efficiency of a Full Wave Rectifier is 81.2%. the primary and the secondary winding separately and it gives a value of 0.693. Form factor is defined as the ratio of the rms value of the output voltage to the average value of the output voltage.

What is the advantage of full wave rectifier?

Advantages: Advantages of full wave rectifier are: The output and efficiency of center tap full wave rectifier are high because AC supply delivers power during both the halves. For the same secondary voltage bridge rectifier has double output.

What are the advantages of half wave rectifier?

The advantage of a half wave rectifier is only that its cheap, simple and easy to construct. It is cheap because of the low number of components involved. Simple because of the straight forwardness in circuit design. Apart from this, a half wave rectifier has more number of disadvantages than advantages!

What is rms value of half wave rectifier?

RMS Voltage of a half wave rectifier, VRMS = Vm / 2 | Vm is the peak voltage. Average Voltage of a half wave rectifier, VAVG = Vm / π Ripple factor, γ = √ ( [ (Vm/ 2) / (Vm / π) ]2 -1 ) = √ ( π / 2 )2 – 1 = 1.21.

What are the types of rectifier?

In this article, we will discuss many types of Rectifiers such as:
  • Single Phase Rectifiers.
  • Three Phase Rectifiers.
  • Controlled Rectifiers.
  • Uncontrolled Rectifiers.
  • Half Wave Rectifiers.
  • Full Wave Rectifiers.
  • Bridge Rectifiers.
  • Center-Tapped Rectifiers.

What is meant voltage?


Voltage, also called electromotive force, is a quantitative expression of the potential difference in charge between two points in an electrical field. Voltage can be direct or alternating. A direct voltage maintains the same polarity at all times.

How do you convert 230v AC to 12v DC?

The following are the steps to convert 230V AC to 12V DC.
  1. Transformer: Connect 230V AC to a 230 to 30V step down transformer.
  2. Rectify: Connect a bridge made up of four Diodes.
  3. Filter: Connect a filter, which filters out ripples from the signal.
  4. Regulate: Connect a LM317, and regulate the output to 12V.

Where is full wave rectifier used?

The Bridge Rectifier circuits are widely used in power supply for various appliances, as they are capable of converting the High AC voltage into Low DC voltage. Full-wave rectifiers are also used for powering up the devices which work on DC voltage like motor and led.

What is ripple factor?

Ripple factor: Ripple factor is a measure of effectiveness of a rectifier circuit. It is defined as the ratio of RMS value of the AC component (ripple component) Irrms in the output waveform to the DC component VDC in the output waveform.

Why do we step down voltage?

In the National Grid, a step-up transformer is used to increase the voltage and reduce the current. Less current means less energy is lost through heating the wire. To keep people safe from these high voltage wires, pylons are used to support transmission lines above the ground.

How is voltage increased?


The way it's increased is by creating an increased electric field, which is in turn generated by charged particles. If you were to increase the voltage, increase the electric field, which means increasing the charged particles. To decrease it, do the opposite.

Where is step down transformer used?

Step-down transformers are used in interconnection of transmission systems with different voltage level. They decrease voltage level from high to lower value (e.g. 765/220 kV, 410/220 kV, 220/ 110 kV). These transformers are huge and have very high nominal power (even 1000 MVA).

How do transformers step up voltage?

A transformer converts alternating current (AC) from one voltage to another voltage. It has no moving parts and works on a magnetic induction principle; it can be designed to "step-up" or "step-down" voltage. So a step up transformer increases the voltage and a step down transformer decreases the voltage.