Types of SMPS

Types of SMPS

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  Types of SMPS Dr.Paras Trivedi Shree J.P. Arts & Science College
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  SWITCHINGDCPOWER SUPPLIES INTRODUCTION LINEAR POWERSUPPLY OVERVIEW OF SWITCHING POWER SUPPLIES DC – DC CONVERTER WITH ELECTRICAL ISOLATION CONTROL OF SMPS POWER SUPPLY PROTECTION APPLICATION
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  Introduction Like a linearpower supply, the SMPS too converts unregulated ac or dc input voltage to a regulated dc output voltage The input voltage is first rectified and filtered using a capacitor at the rectifieroutput unregulated dc voltage across the capacitor is then fed to a high frequency dc-to-dc converter The high frequency transformer used in a SMPS
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  LinearPowerSupplies
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  Disadvantagesof LPS The outputfluctuates with input which is not desirable Isolation is not possible Efficiency is very low Bulky and noisy
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  SMPSBlockDiagram
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  SwitchingDCPowerSupplywith Multiple Outputs In mostapplications, several dc voltages are required, possibly electrically isolated from eachother
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  FlybackConverter
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  Fly-back Converter Waveforms
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  Types of flybackconverters 1.Two transistor flyback converter 2. Parallelled flyback converter
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  ForwardConverter Derived from Buck;idealized to assumethatthe transformer is ideal (not possible inpractice)
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  Half-Bridge Converter Derived fromBuckconverter
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  Full-BridgeConverter Usedat higher powerlevels (> 0.5 kW )
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  InputFilter Needed to complywiththe EMI and harmonic limits
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  Conclusion • One ofthe most important applications of power electronics is SMPS • High efficiency and small weight and size • In SMPS multiple outputs are possible • Losses is minimum and only switching losses are present • Current rating is medium • The high frequency transformer used in a SMPS