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Regulated Power Supply
Based on the type of output, power supplies can be classified as regulated and unregulated. In a regulated power supply, the voltage remains constant regardless of the load. The term ‘regulation' implies the ability of power supplies to maintain an output voltage that remains within a specified tolerance level as referenced to the changing conditions of the input voltage.
An ideal regulated power supply would be an electronic circuit that is designed for providing a predetermined DC voltage. On the contrary, an unregulated power supply will have higher outputs than stated. These types of outputs are normally used in equipments having their own internal regulation circuitry.
Reasons for Using Regulated Power Supply
A higher than recommended voltage may have a damaging impact on the equipment. To save your equipment from such damages, always choose a regulated supply of power. A regulated power supply is suitable to any application due to the following flaws in the unregulated power supply:
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With variation, the load also varies and the output is not constant.
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The DC output voltage also varies with variation in the AC input voltage.
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Due to the use of semiconductor devices, there is a variation in the DC output voltage with change in the temperature.
Using the Zener Diode to Attain Regulated Power Supply
A common method of attaining regulated supply is to use a Zener diode in the circuit. The shortcomings of an unregulated power supply can be overcome by the use of this diode. The Zener diode is different from the normal diode as it facilitates the flow of current also in the reverse direction if the voltage is greater than the breakdown voltage.
The device can be connected in parallel with the source of voltage which is variable. When the reveres biasness is achieved, the Zener diode is called a shunt voltage regulator. Alternatively, they can be used in series with the base-emitter junction. A DC error amplifier that is used in a stabilized power supply can be cited as an example of this case.
Some typical applications of this kind of power supply are:
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Mobile phone power adaptors
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Internal T.V. receiver power regulators
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D.C. variable bench supply
About the Author
CyPower offers a wide range of AC/DC power converter at affordable prices.
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 Triple Output Variable Digital Regulated Lab Grade DC POWER SUPPLY 30V 3A NEW  US $185.99
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 Triple Output Variable 30V 3A DC Power Supply Digital Regulated Lab Grade NEW US $185.99
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