Electronic Voltage regulator

Voltage regulator



Voltage regulator is designed to maintain constant voltage level. A voltage regulator may be a simple "feed-forward" design or may include negative feedback control loops. It may use an electromechanical mechanism, or electronic components. Depending on the design, it may be used to regulate one or more AC or DC voltages.


Electronic voltage regulators are found in devices such as:
  • Computer power supplies.
  • Automobile alternators
  • Central power station generator plants, 
  • Substation or along distribution lines

Active regulator


Consist at least one active (amplifying) component such as a transistor or operational amplifier. In general, these active regulators can be divided into several classes:
  • Linear series regulators
  • Switching regulators
  • SCR regulators

Example Of linear Regulator

Transistor regulator

Regulator with an operational amplifier


Fixed Regulator


Usually having three legs, converts varying input voltage and produces a constant regulated output voltage. They are available in a variety of outputs.
The most common part numbers start with the numbers 78 or 79 and finish with two digits indicating the output voltage. The number 78xx represents positive voltage and 79xx for negative.


Examples: 
  • 5V DC Regulator Name: LM7805 or MC7805
  • -5V DC Regulator Name: LM7905 or MC7905
  • 6V DC Regulator Name: LM7806 or MC7806
  • -9V DC Regulator Name: LM7909 or MC7909

1 comment:

Boni Kacak said...

wah.. first time aku dengar pasal menatang ni