POWER SUPPLY SYSTEMS
In strict terminology, the power supply for operating such things as TVs, videorecorders and cameras is a primary energy source like domestic mains electricity, a battery or a generating set. In our context, the power supply unit (PSU) is not a generator but a controller of energy; the less energy it dissipates within itself (manifest as heating of components) the better. All the above-mentioned energy sources are subject to fluctuation: mains supplies can vary ±6% of nominal voltage due to load and distribution factors; batteries have a falling output voltage throughout their discharge cycle; and the voltage supplied by a generator depends on engine speed and the load imposed, both mechanical and electrical. ...
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