# Voltage regulation

#### chaitu123

Joined Aug 31, 2009
6
What is Voltage regulation? & What is the need of regulation?Give me a brief idea.

#### studiot

Joined Nov 9, 2007
5,003
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

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%

#### t06afre

Joined May 11, 2009
5,936
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.

#### hgmjr

Joined Jan 28, 2005
9,029
What is Voltage regulation? & What is the need of regulation?Give me a brief idea.
Both of these questions are very broadly cast. Is there a type of voltage regulation in which you are specifically interested?

hgmjr

#### bountyhunter

Joined Sep 7, 2009
2,498
What is Voltage regulation? & What is the need of regulation?Give me a brief idea.
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.