How does a USB to 12 V adapter cable work?
I want to use a power bank for a small keyboard with 12 V working voltage
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That’s all called up controllers.
The 5V voltage is unconverted into a pulsating DC voltage and is thus made ācompatible with the crimeā. Then sent by a transformer, transformed to something above 12V, rectified and voltage regulated.
In order that the transformer does not have to be as large, a higher network frequency than the usual 50 Hertz network frequency is used, so that it is 5 to 30 kHz depending on the construction.
This controller naturally draws, according to the power rule, an over twice as high current on the 5V side as is drawn on the 12V side.
The current switching network parts operate very similar, only here directly the mains voltage is rectified beforehand, and then, of course, likewise pulsed, transformed to ābottomā.
In this type of power supplies there are various “pulse forms”. And often feedback control, so that the output voltage influences the “input” voltage control (e.g. over the pulse length).
There are no differences from the outside, the function for something like a keyboard is always given.
Thank you, I can imagine something. Amazing that these adapters are so small
You need one Boost converter. for example
https://eckstein-shop.de/XL6009DC-adjustableStep-UPvoltage controllerPowerBoostModul
However, you have to adjust this once to the 12 V, which heist, you need a measuring device that shows you when you have often turned enough on the pot.
Make sure how much power your keyboard needs or how much power the original power supply can and take a Boost Converter that creates (or a little more).