Voltage regulation

Discussion in 'General Electronics Chat' started by chaitu123, Sep 15, 2009.

  1. chaitu123

    Thread Starter New Member

    Aug 31, 2009
    What is Voltage regulation? & What is the need of regulation?Give me a brief idea.
  2. studiot

    AAC Fanatic!

    Nov 9, 2007
    Any voltage source has a certain internal resistance.

    This means that as more and more current is drawn form it the output voltage will drop.

    Voltage regulation is a measure of this and is defined for a particular current as

    ( Off-load voltage - On-load-voltage )x100 / Off-load voltage .

    It is thus expressed as a percentage.

    So the voltage regulation for a transformer that reads 24 volts offload and 20 volts at 2 amps is

    (24-20) x100/24 % ie 17%
  3. t06afre

    AAC Fanatic!

    May 11, 2009
    You use a voltage regulator to compensate for changes in the input voltage, and load current. A voltage regulator is an "real world" approximation to an ideal voltage source. An ideal voltage source has zero output resistance and may source an infinite magnitude of current. Such a device is only theoretical. A very typical voltage regulator is the LM7805. It give a constant 5 volt output. As long as some values like input voltage and output current is inside the circuit specification.
  4. hgmjr

    Retired Moderator

    Jan 28, 2005
    Both of these questions are very broadly cast. Is there a type of voltage regulation in which you are specifically interested?

  5. bountyhunter

    Well-Known Member

    Sep 7, 2009
    It's official definition is how much the source voltage changes when the load current is varied from no load to full load. It is usually specified as %VOUT/A.