Electronics Online

This is a basic theory document for power supply design by Teuvo Suntio. You’ll find reference about basic electrical math there…

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A power supply or UPS circuit can be a device that supplies electrical power to one or far more electrical loads. The term is most generally applied to devices that convert one form of electrical energy to an additional, though it could also refer to devices that convert another form of energy (e.g., mechanical, chemical, solar) to electrical energy. A regulated power source is one that controls the output voltage or present to a specific value; the controlled worth is held almost constant regardless of variations in either load electric current or the voltage supplied by the power supply’s power source.

A frequent power supply circuit typically includes in the following modul circuit:

A switched-mode power supply (switching-mode power supply, SMPS, or just switcher) is an electronic power supply that incorporates a switching regulator in order to be highly efficient in the conversion of electrical power. Like other kinds of power supplies, an SMPS transfers power from a source like the electrical power grid to a load (e.g., a individual computer) whilst converting voltage and current characteristics. An SMPS is usually employed to efficiently supply a regulated output voltage, generally at a level diverse from the input voltage. Unlike a linear power supply, the pass transistor of a switching mode supply switches very quickly (typically between 50 kHz and 1 MHz) between full-on and full-off states, which minimizes wasted energy. Voltage regulation is supplied by varying the ratio of on to off time. In contrast, a linear power supply should dissipate the excess voltage to regulate the output. This higher efficiency will be the chief benefit of a switched-mode power supply.