Universal notebook power supplies

No matter where you use your portable computer, the search for an outlet belongs to the ritual. Because on battery you can run your notebook only if it is unavoidable.


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Correspondingly, it is called for many users to crawl under the table, unplug the power supply, roll in the cable, pack the power supply, and then start the power supply again in the reverse order. Who runs his notebook mainly at two locations - e.g. At home and in the office - a second power supply will be needed to save the day-to-day life.


Voltage arc


Of course you can purchase a second power supply from the notebook manufacturer. Only these are not always cheap and above all not to have the fast next door at the electronic discounter. In this breach, various providers of universal networks can be found.


Extra sausages


Most modern notebooks expect a DC voltage of around 19 volts from their power supplies. The voltage does not have to match exactly. The large mass of the 19 Volt power supply is also suitable for notebooks, which demand according to manufacturers according to 18.5, 19, 19.5 or even 20 Volt. The exact voltage control takes place on the main board or a daughter board inside the notebook.


Reading


The charging voltage for the battery is also generated here, whereby the actual charging control can also be in the battery pack. Correspondingly, the tolerance against fluctuations in the supply voltage of the external notebook power supply is comparatively large. As the majority of notebooks demand 19 Volts, this output voltage was the minimum requirement for participation in our test.


However, there are also notebooks which, according to less - e.g. 16 volts or more - e.g. 24 volt voltage thirsts. Correspondingly, we have two power supplies (Lindy, Perl), which also supply alternative supply voltages. The Lindy SPS EA1122 has a coding in the plug that ensures that the power supply supplies the appropriate voltage. For this, the plugs are marked in color, which should be observed.


Otherwise, otherwise identical connectors could provide a fatal high voltage. The Perl Revolt PX-1047 offers a small pressure switch with which the output voltage can be selected. An LED display informs about the selected voltage. This is not entirely without danger, especially since the Perl power supply is the only device to test the connector plugged in accidentally and the manual will not be aware of this danger.


Before you buy a second power supply, you should in any case clarify which voltage and how much power your notebook needs. It is best to take a look at the type plate of your original power supply. Voltage and maximum current should be indicated. A typical value would be 19 volts and 3 amperes.


This results in a power of (19 volts x 3 amperes) of 57 watts. As a retrofit power supply, an item with a nominal voltage of 19 volts and 60 watts should suffice. Something more than the original can not hurt, but who is too big for its power supply, but it may pay more and is also more difficult to carry.