Power supply
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A power supply unit (sometimes abbreviated power supply or PSU) is a device or system that supplies electrical or other types of energy to an output load or group of loads.
The term is most commonly applied to electrical energy supplies.
General description
Many people say that the term "power supply" should be reserved for those devices that convert some other form of energy into electricity (such as solar power and fuel cells and generators). A more accurate term for devices that convert one form of electric power into another form of electric power (such as transformers and linear regulators) is power converter. The complete range of power supplies is very broad, since widely differing design criteria affect each application. As well as the usual requirements of cost, reliability, weight and size, constraints that commonly affect power supplies are the amount of power they can supply, how long they can supply it for without needing some kind of refueling or recharging, how stable their output voltage or current is under varying load conditions, and whether they provide continuous power or pulses.
Electrical power supplies
This term covers the mains power distribution system together with any other primary or secondary sources of energy such as:
- Batteries
- Chemical fuel cells and other forms of energy storage systems
- Solar power
- Conversion of another form of electrical power into the desired form (typically converting 120 or 240 volt alternating current supplied by a utility company (see electricity generation) into low-voltage direct current for electronic devices); see switched-mode power supply, linear regulator, rectifier, inverter (electrical)
- Generators or alternators (particularly useful in vehicles of all shapes and sizes, where the engine has rotational power to spare, or in semi-portable units containing an internal combustion engine and a generator)(For large-scale power supplies, see electricity generation.)Low voltage, low power dc power supply units are commonly integrated with the devices they supply, such as computers and household electronics.
Domestic mains adaptors
A power supply (or in some cases just a transformer) that is built into the top of a plug is known as a wall wart, power brick, or just power adapter.
Mechanical power supplies
- Flywheels coupled to generators or alternators
- Compulsators
- Explosively pumped flux compression generators