Regulated and unregulated power supply pdf

Posted on Thursday, April 29, 2021 7:32:04 AM Posted by Jay S. - 29.04.2021 and pdf, management pdf 3 Comments

regulated and unregulated power supply pdf

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Regulated Power Supply

A switched-mode power supply switching-mode power supply , switch-mode power supply , switched power supply , SMPS , or switcher is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Unlike a linear power supply , the pass transistor of a switching-mode supply continually switches between low- dissipation , full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. A hypothetical ideal switched-mode power supply dissipates no power. Voltage regulation is achieved by varying the ratio of on-to-off time also known as duty cycles. In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.

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. So, the filtered output is then applied to a voltage regulator which provides a stable DC output voltage. Such a system is called a regulated power supply because it supplies a stable voltage.


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. Power supplies adapt the type of power available, either direct current, DC, or alternating current, AC, to the needed form and voltage for a specific use. AC to DC is the most common type because electrical devices use direct current, whereas the power supply from an outlet is in alternating current.

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.

Switched-mode power supply

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.

The power supply unit is the part of the hardware that is used to convert the power provided from the outlet into usable power to many parts inside an electrical device. Every energy supply must drive its load, which is connected to it. Depending on its design, a power supply unit may obtain energy from various types of energy sources, like electrical energy transmission systems , electromechanical systems such as generators and alternators, solar power converters, energy storage devices such as a battery and fuel cells, or other power supply.

There are three major kinds of power supplies: unregulated also called brute force , linear regulated , and switching.

Difference Between Regulated and Unregulated Power Supply

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.

In its simplest definition, power supply is an electrical circuit that converts some form of energy into electrical energy, providing power to any electronic device. There are typically four types of power supplies:. The intrinsic differences between these four power supplies include size, weight, cost efficiency, voltage output, and ripple. The basic difference between a regulated and an unregulated power supply is the presence or absence of voltage regulation. On the contrary, unregulated power supplies do not have voltage regulation and for this reason, voltage is not regulated at the output. Voltage regulation in regulated power supplies refers to maintaining the voltage at the desired level.

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Chapter 9 - Practical Analog Semiconductor Circuits

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