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). The principal reason for the move toswitch mode power supplies is their much greater efficiency typi-cally 65 - 90% as opposed to 25 - 50% for the linear regulator.

Fig.2.4 Half-bridge converter 4) Full-bridge converter A power switching circuit in which four transistors are connected in a bridge configuration to drive a transformer primary. Vcc TR1 TR3 T1 D1 D2 C1 RL L1 TR4 TR2 Fig.2.5 Full-bridge converter 5) Flyback converter A power supply switching circuit which normally uses a single tran-sistor.

  Power, Converter, Flyback, Flyback converter