Technical Notes - COSEL

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1Outline of Power Supply2Circuit Method of Switch mode Power Supply3Glossary of term374Notes on operationTechnical Notes385Electromagnetic Interference6Power Factor Correction7Reliability8Safety Standards9Standards and Regulations for Switch mode Power Supply10 Disclaimer38394247495252535538Regulated DC voltage is required for semiconductor devices suchas ICs and Transistors to function. Regulated voltage can be gen-erated from commercial AC lines with an AC to DC power supply orfrom DC power source (such as Batteries) with a DC to DC type is further classified to one that is isolated between pri-mary (Input) circuit and secondary (Output) circuit or the past 15 years, there have been significant changes inthe design of power supplies. The most important of these hasbeen widespread change from linear regulator to switch modepower supplies (SMPS).

rent are drawn from the supply near the peak point of the AC volt-age sinewave. Voltage Current Fig.3.2 Input wave form of SMPS Input Current (rms) = Output Power Input Voltage (rms) Efficiency Power Factor 3) Input Power It can be seen that the input voltage is only slightly distorted by the very non-linear load presented by the capacitor ...

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