The working of regulated and unregulated power supply is explained in detail with a Block Diagram, and Circuit Diagram. There are two types of power supplies existed, AC and DC power supply. Based on the electrical Regulated Power Supply Block Diagram. Here the basic. An AC powered unregulated power supply usually uses a transformer to convert the voltage from the wall outlet (mains) to a different, nowadays usually lower.


Author: Ms. Irving Watsica
Country: Ghana
Language: English
Genre: Education
Published: 18 December 2017
Pages: 86
PDF File Size: 42.99 Mb
ePub File Size: 32.4 Mb
ISBN: 948-8-67571-428-4
Downloads: 42361
Price: Free
Uploader: Ms. Irving Watsica


This DC supply is regulated and limited in terms of voltage and current. But the supply provided from mains may be fluctuating and could easily break down the electronic equipment, if not properly limited.

This work of converting an unregulated alternating current AC or voltage to a limited Direct current DC or voltage to make the output constant regardless of the fluctuations in input, is done by a regulated power supply circuit.

All the active and passive electronic devices will have a certain DC operating point Q-point or Quiescent pointand this point must be achieved by the source of DC power.

The DC power supply is practically converted to each and every stage in an electronic system. Thus a common requirement for all these phases will be the DC power supply.

All low power system can be run with a battery. But, for a long time operating devices, batteries could prove to be costly and complicated. The best method used is in the form of an unregulated power supply —a combination of a transformer, rectifier and a filter.

The diagram is shown below. Unregulated Power Supply — Diagram As shown in the figure block diagram of power supply, a small step down transformer is used to reduce the voltage level to the devices needs.

The output of the transformer is a pulsating sinusoidal AC voltage, block diagram of power supply is converted to pulsating DC with the help of a rectifier. This output is given to a filter circuit which reduces the AC ripples, and passes the DC components.


But here are certain disadvantages in using an unregulated power supply. Disadvantages of unregulated power supply 1.

  • Regulated Power Supply-Block Diagram,Circuit Diagram,Working
  • Basic Power Supply block Diagram - Electronics Area
  • Figure diagram of a basic power supply
  • The Power Supply electric parts

The output voltage changes by a great value due to the huge change in the current drawn from the supply. But this value may go higher in some countries volts.

Dc power supplies-Introduction - Electronic Circuits and Diagrams-Electronic Projects and Design

These block diagram of power supply in dc output voltage may cause an inaccurate or erratic operation or even malfunctioning of many electronic circuits.

For instance, in oscillators the frequency will shift, in transmitters output will get distorted, and in amplifiers, the operating point will shift causing bias instability.

Because each diode in the rectifier section conducts for degrees of the degree input, the output of the rectifier will be one-half, or approximately volts of pulsating dc. The filter section, a network of resistors, capacitors, or inductors, controls the rise and fall time of the varying signal; consequently, the signal remains at a block diagram of power supply constant dc level.

The Power Supply block Diagram

You will see the filter process more clearly in the discussion of the actual filter circuits. The output of the filter is a signal of volts dc, with ac ripple riding on the dc.

Block diagram of power supply reason for the lower voltage average voltage will be explained later in this chapter. Transformer is used to step-up or step-down usually to step-down the-supply voltage as per need of the solid-state electronic devices and circuits to be supplied by the dc power supply.

It can provide isolation from the supply line-an important safety consideration.

It may also include internal shielding to prevent unwanted electrical noise signal on the power line from getting into the power supply and possibly disturbing the load. What is a rectifier in general?

Rectifier is a device which converts the sinusoidal ac voltage into either positive or negative pulsating dc. The rectifier typically needs one, two or four diodes.

Rectifiers may be either half-wave rectifiers or full-wave rectifiers centre-tap or bridge type. The output voltage from a rectifier circuit has a pulsating character i.

Related Post