How to Choose the Right Power Supply for Your PC


There are two basic types of power supplies: switched converters and linear converters. Linear converters are simple and generate less noise and heat. Switched converters, on the other hand, are more complicated and generate more noise. Both types have their advantages and disadvantages, and the right power supply depends on the type of application and operating conditions.

High-Frequency AC Noise

When choosing a Power Supply, it is important to choose one that is low in common-mode noise. This type of noise is caused by common mode switching and is not caused by the power supply itself. Common-mode noise is a common problem in power supplies. It is the result of the alternating current flowing from the power supply's input to the chassis ground.



Common-mode noise is a kind of electronic interference that reaches high frequencies. It can be audible or ultrasonic and may cause measurement errors in sensitive electronics. For this reason, switching power supplies are usually avoided in high-end audio and instrumentation applications. They often feature internal shielding between the primary and secondary windings to reduce noise.

Low-Pass Filter

A Low-pass filter is a circuit that changes the charge time of a capacitor. This results in a voltage lag in the output relative to the input signal. This lag increases as the input frequency increases. Inductive and capacitive Low-pass filters both have the same effect.

Generally, an inductive Low-pass filter is preferred in AC-DC power supplies because they filter out the AC ripple waveform and pass only pure DC components. However, they require a low filter resistance. The capacitors and inductors are placed in series on the power supply. This allows them to pass only the DC component, thus reducing the overall resistance of the circuit.


The Low-pass filter has a cut-off frequency. This frequency is the point at which the output voltage equals seventy-seven per cent of the input voltage. Above this point, the signal is significantly attenuated and cannot be passed.

Isolated Power Supply

An Isolated Power Supply is a special type of power supply that isolates the output from the ground. It offers several advantages over a standard TN Earthed Supply. Aside from being more reliable, it eliminates the risk of tripped MCBs caused by a single earth fault. It also guarantees continuous power for critical medical sockets.



Isolated power supplies are also known as isolated dc-dc converters. They are often used in medical devices where high voltages and currents are not acceptable. Their isolation features help prevent the spillover of high voltages and currents to the DC side. The isolation also helps prevent the development of digital noises.

Safety concerns

When working with a power supply, you need to take special precautions to avoid injury or damage. One way to do this is to use a safety fuse. You may also want to avoid using thin wires. If your cord is thin, it can short-circuit the overload protection circuit. When using wires, be sure to use a rated size for the wires you use.



Power supplies are often required to conform to certain safety standards in different regions. These standards are defined by national or international agencies. Government-recognized testing laboratories certify that products meet statutory regulations. The primary goal of these standards is to prevent injuries, fire, and electric shock. The product may also be labelled with a safety mark from an associated standards organization or local legislation.

Limitations of a power supply

The power supply is a critical component of your computer system. It provides electrical power for every component of the system. It is also one of the most susceptible parts to failure, which makes it crucial to keep your PC operating properly. Understanding the power supply's limitations and problems is essential for keeping your computer running efficiently.

Before using a power supply, make sure you understand the various types and their characteristics. Some power supplies are more efficient than others, while others are prone to overheating or producing noise. You should also be aware of the power consumption of your system. Some power supplies also have higher power output ratings, but you should make sure that you purchase one that will meet your needs.

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