Useful information on PSUs

What are PSUs and what are they used for?

Electrical appliances require electricity that can be supplied from the mains via sockets. The usual voltage in Europe is 230 volt. Even though some devices need such a high voltage, for many of them a much smaller voltage suffices. These small consumer devices typically include mobile phones, telephones, organizers, etc. This is why the voltage of 230V must be transformed to a lower voltage. In more sizeable devices (e.g. printer, computer etc.), this happens within the device itself. However, many products are too small to integrate component parts needed for voltage transformation. For this very reason, the available PSUs take over this task externally and supply the correct voltage to the consumer device.  The handiest design is the plug-in PSU that plugs directly into the socket. This explains why PSUs play such an important role, for without them, no device would function properly. Also, the products using PSUs are becoming smaller and lighter all the time, so sometimes the component parts of PSUs can be heavier than the device itself. On the other hand, the consumer is often enough only interested in the final product and does not want to be bothered with its PSU.  In other words: PSUs are, unfortunately, a nuisance, one has to live with. Hence, Egston is aiming high to render this nuisance as bearable as possible.

Which Types of PSUs are available on the market?

Some years ago, only the so-called 50 H power packs were available on the market. These downsize the voltage from 230V to the required secondary voltage.  This task is mainly performed by a transformer. This inductive component consists of an iron core with several windings made of thin copper wire. This basically means: Weight and space. The big disadvantages (as they are literally big) render such PSUs cumbersome and unattractive.

However, with a technical trick, these disadvantages can be avoided. The size of the transformer depends on the AV frequency transformed (Europe: 50 hertz).The higher the frequency, the smaller may the transformer be. Rated SMPSs profit exactly from this property by increasing the frequency many times (instead of 50 hertz, 60,000 to 400,000 hertz are used). Consequently, the size and weight of the transformer can be reduced equally drastically. Even though this principle has been generally known, the implied advantages were hardly ever exploited. Egston was the first manufacturer to produce a rated SMPS integrated into a common flat Euro plug (output 3.6 watt). So far, this innovation has remained unrivalled by our competitors.

Which Difference exactly is there between rated and non-rated PSUs?

Rated Egston PSUs Non-rated PSUs
Weight approx. 50 g from 500 up to 750 g
Compactness handy, only need to be plugged into a multiple extension socket bulky, often block the use of neighbouring sockets
Non-load consumption
Even if the consumer device is not used, PSUs consume energy
some milliwatt
The difference to non-rated devices is enormous. Assuming an average consumption for all PSUs used in one household, a medium-sized city in Europe could thus annually economize 20,000t of crude oil
2 to 5 watt
Efficiency ratio
Defined as the percentage of energy from the mains left over for the consumer device
> 75%
In this instance, too, there is a distinct advantage as a device that consumes the same energy could outlast its normal service life 2 to 3 times
from 20 up to 30%

A PSU is a necessary evil, you will have to live with, but Egston wants to make your life easier.

What makes Egston plug-in PSUs so Special?

Weight They are hard to beat. Egston PSUs are the lightest power packs available on the market these days.
Compactness Nobody can produce compacter models. Egston the pioneer of small-sized PSUs.
Quality Egston emphasizes quality, and this is our credo to which we will stick without budging an inch. High-precision checks, continuos improvements, exceptional partners and component parts based on our experience (inductive component parts), are paving the way to our target.  ISO 9001 certification helps us to fulfill these high-quality standards.
Happy customers We shall always stand for to our word. You can trust us that we’ll stand for to the performance features we promised. Unfortunately, this is not always the case in this industry.
Design Egston introduced design as an important category for plug-in PSUs.Who told you that PSUs need to be ugly? We believe that an attractive final product should be accompanied by equally attractive accessories.


What you should know before Buying?

Consumers are, to a certain degree, protected by the law because every PSU manufacturer must comply with the various testing standards. Sometimes products are labelled with test marks (e.g. ÖVE, VDE, UL, etc.) that document the corresponding testing standards.However, it’s most important to use a reputable and reliable manufacturer such as Egston.