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Types of Power Supply Units

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The power supply can be defined as an electrical device used to transmit electrical supply to electrical loads. This device’s main function is to regulate the electrical current from a source to the accurate voltage, frequency, and current to supply the load.

Sometimes, these computer power supplies can be referred to as electric power converters. Some types of supplies are separate pieces of loads, whereas others are built into the appliances that they supply electricity to.

Moreover, a Power supply circuit is used in various electrical & electronic devices. The power supply circuits are classified into different types based on their power for providing for circuits or devices.

For instance, the microcontroller-based circuits are generally the 5V DC regulated power supply (RPS) circuits, which can be designed with the help of different methods for changing the power from 230V AC to 5V DC.

Our Top Three Picks For The Best Power Supply Unit

Switch Mode Power Supply

Input Filtering Supported Power Supply unit


An SMPS power supply or computer power supply is a power supply that includes a switching regulator for converting electrical power powerfully. Like other power supplies, this power supply transmits the power from a DC source or AC source to DC loads, such as a PC (personal computer), while changing the characteristics of current and voltage.

In a switch-mode power supply system, input filtering helps to provide immunity from mains-borne noise while also reducing emission back into the mains supply, which is a greater concern with switch mode power supplies than their linear counterparts.

After filtering, the AC line voltage is rectified before power factor correction is applied to reduce power losses together with current harmonics that can cause interference to other appliances connected to the same supply.

The DC voltage is then switched at a frequency much higher than that of the AC line, allowing it to be converted via the transformer to another voltage, with reduced core losses whilst using a much smaller and lighter transformer. Switching is controlled via the SMPS Controller, which typically generates a PWM signal, taking feedback from the power supply output.

Pros and Cons


  • Typically much smaller and lighter.
  • More efficient than regulated linear power supplies.
  • Often lower cost due to much smaller transformers used.


  • More complex.
  • Slower transient response times.

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Uninterruptible Power Supply

UPS Supported Power Supply Unit


Similarly, UPS (uninterruptible power supply) is an electrical device that permits a desktop computer to keep working for some time as the main power supply is lost. This device is also given protection from power flow.

A UPS includes a battery to store the energy when the device detects a power loss from the main source. For instance, if you are using the PC when the uninterruptible power supply senses the power loss, you have to save the data before the UPS (secondary power source) discharges.

When both the primary and secondary power sources run out, any data in your computer’s RAM (random access memory) is erased. When power loss occurs, a secondary power source stops the loss of power to harm the personal computer.

Pros and Cons


  • Standby Power Supply.
  • Instant Power Supply.
  • Silent Power Supply.


  • Unable to run heavy appliances.
  • Substandard batteries.

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Linear Power Supply

Low Complexity Level Power Supply Unit


The LPS (linear power supply) or LR (linear regulator) circuit is used in various electrical & electronic circuits for supplying the DC to the entire circuit. The linear power supply mainly includes a step-down transformer, rectifier, filter circuit & voltage regulator. This circuit’s main function is at first; step-downs the alternating current voltage then changes it into direct current.

Interestingly, Linear regulators have a straightforward design in that they require few components, making it an easy device for design engineers to work with. This simplistic design makes linear power supplies more reliable because the low complexity level does not allow many issues to arise.

The main features of this power supply include the following: The efficiency of this power supply ranges from 20 to 25%The magnetic materials used in this power supply are CRGO core or St Alloy. It is more reliable, less complex, and bulky.

Pros and Cons


  • It is Noise-free.
  • Overall Cost-effectiveness
  • It gives a faster response.


  • It requires a large transformer and other large components to handle the power.
  • High heat loss occurs when regulating a high power load.

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On the whole, this is all about different types of power supplies, and these are being used for providing the power supply to different systems efficiently. Power supplies are the essential components of every system to get electrical energy for the operation.

So, some of the considerations of a power supply like design or development are more significant. When deciding on which power supply to use for an application, it is necessary to look at many elements beyond just size, cost, and efficiency. 

Because day-by-day the invention of technology as well as power supplies are being increased for providing protection to electrical and electronic devices. See more options on

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