Design of Low Power Switching Mode Power Supply AC/DC

Abstract: The power supply is an important part of electronic equipments. Along with the electronic technology’s rapid development, power supply needs more advanced technique. Switch power supply replaced the traditional linear power supply and has been widely used in electronic areas. Low-power switching power has characteristic of Low Power Loss, high rate of conversion, small size and light weight. The paper discussed about internal and overseas development circs, theory and applies of Low-power switching power. Analyzed the advantages and disadvantages about PWM control based on current and pressure mode. Low Power Switching Mode Power Supply’s design is based on NCP1215 and PWM. Transformer or phototube of coupling is used to separate control electro circuit and main electro circuit.

Key words:  SMPS,  Low Standby Power Loss,  PWM,  NCP1215