difference between regulated and unregulated power supply pdf Friday, March 26, 2021 6:54:56 AM

Difference Between Regulated And Unregulated Power Supply Pdf

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A power supply is an electrical device that supplies electric power to an electrical load.

Regulated power supply

Generally, a power supply is a device or an electrical circuit that gives energy power to another electrical device. There are many types of power supplies; regulated and unregulated power supplies are two such categories based on the type of output. In regulated power supplies, the output DC voltage is regulated so that a change in input voltage is not reflected in the output. In contrast, unregulated power supplies do not have a voltage regulation at the output. This is the key difference between regulated and unregulated power supply.

In a general sense, a power supply is any device that supplies energy power! Taken this way, batteries are power supplies for flashlights and power plants are power supplies for the electrical grid. In most non-industrial settings, the available power, or input power, is AC, and the output power is DC. A power supply will receive power from an electrical outlet and convert the current from AC to DC. So, is every power supply built and designed the same? The answer is no. Each device needs a different amount of power, or DC, to function, meaning the power supply has to somehow regulate the voltage, keeping the device from overheating.

Almost all basic household electronic circuits need an unregulated AC to be converted to constant DC, in order to operate the electronic device. All devices will have a certain power supply limit and the electronic circuits inside these devices must be able to supply a constant DC voltage within this limit. 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 point , and 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.

Power supply

For a vast number of applications, a simple unregulated power supply is sufficient. This type of power supplies are normally used to supply power to current-hungry loads, for instance:. Although not regulated or stabilized, when designed correctly, they can be a cheap alternative to regulated power supplies. The power switch S1, via the fuse F1, gives power to the transformer TR1. The transformer perform two tasks:. This shows how the bridge rectifier changes the AC voltage into a DC voltage.

The term power supply can be broadly defined as anything that supplies power to literally every electrical and electronic system. In its simplest definition, a power supply is an electrical or electronic component that converts an available AC input voltage into a desired DC output voltage or to multiple DC outputs. Every electronic circuit or system needs a stable DC voltage for its intended operation. However, the obtained DC voltage does not remain constant due to the variations in load current, variations in mains voltage and changes in ambient temperature. Such a system is called an unregulated power supply because the output changes significantly when its input load varies.


Understanding the difference between a regulated and unregulated power supply will give you the information you need to choose which best serves your purposes. To start, you need to fully understand why you need a power supply and what you require it to do. From there, your intended use will help you choose whether a regulated or unregulated option will best serve your needs.

With the help of a rectifier it converts AC supply into DC. Its function is to supply a stable voltage or less often current , to a circuit or device that must be operated within certain power supply limits. The output from the regulated power supply may be alternating or unidirectional, but is nearly always DC Direct Current. The latter is much more common today. Many topologies have been used since the regulated supply was invented.

Power is the backbone of any electronic system and the power supply is what feeds the system. Choosing the right supply can be the critical difference between a device working at optimum levels and one that may deliver inconsistent results. Direct current power supplies are either unregulated or regulated. Regulated supplies come in several options including linear, switched and battery-based. A power supply takes the AC from the wall outlet, converts it to unregulated DC, and reduces the voltage using an input power transformer, typically stepping it down to the voltage required by the load.

Design of an Unregulated Power Supply

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