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Switched Mode Power Supply

Switched Mode Power Supply. General description of Power Supply Advantages/Disadvantages of SMPS Block diagram of SMPS Basic topologies and practical requirements Working of various SMPS topologies: 1. Flyback Converter

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Switched Mode Power Supply

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  1. Switched Mode PowerSupply

  2. General description of PowerSupply • Advantages/Disadvantages of SMPS • Block diagram ofSMPS • Basic topologies andpractical • requirements • Working of various SMPS topologies: 1. FlybackConverter • 2. Push-pull Converter 3. Half bridge Converter 4. Full bridgeConverter • Applications ofSMPS • Conclusion Contents:-

  3. Any device that supplies electric power to an electricload. The different types ofpower suppliesinclude: -Battery -DC powersupply -AC powersupply -Linear regulated powersupply -Switched mode powersupply -Programmable powersupply -Uninterruptible powersupply PowerSupply:-

  4. An electrical power supply that incorporates aswitching • regulator to convert electrical powerefficiently. • It transfers power from a source, to a load, while converting voltage and currentcharacteristics. • Voltage regulation is achieved by varying the ratio of on- to-offtime. Switched Mode PowerSupply:

  5. 1. Lowerweight • 2. Smallersize • 3. Higherefficiency • 4. Lower powerdissipation • 5. Wide ac input voltagerange • 6. Reducedcosts Advantages of SMPS over Linear PowerSupplies: Disadvantages ofSMPS: 1. Complexity of thecircuit

  6. Block diagram of aSMPS 1. Input rectifierstage: It is used to convert an ac input to dc. A SMPS with dc input does not require this stage. The rectifier produces unregulated dc which is then passed through the filtercircuit.

  7. 2. Inverterstage: • – The inverter stage converts DC, whether directly from the input or from the rectifier stage described above, to AC by running it through a power oscillator, whose output transformer is very smallwithfewwindingsatafrequencyoftensorhundreds • ofkilohertz. • 3. Outputtransformer: • - If the output required is to be isolated from input, the inverted AC is used to draw the primary windings of a high frequency transformer. This converts the voltage up or down to the required output level on it’s secondarywinding. • 4. Outputrectifier: • - Ifthedcoutputisrequired,theacoutputfromthetransformer • isrectified. • 5. Regulation: • - Feedback circuit monitors the output voltage and compares it with the referencevoltage.

  8. 1. Is input-to-output dielectric isolation required for theapplication? • 2. Are multiple outputs required? • 3. Does the prospective topology place a reasonable voltage stress across the voltage semiconductors? • 4. Does the prospective topology place a reasonable current stress across the voltage semiconductors? • 5. How much of the input voltage is placed across theprimary • transformer winding orinductor? • Typical maximum output power available from eachtopology: Factors to be considered while selecting a topology for a particularapplication:-

  9. Non isolated topologies are the simplest, with the three basic types usinga • single inductor for energystorage. Use of non-isolatedtopologies:

  10. Use of various transformer isolatedtopologies:

  11. Working of various SMPSTopologies: 1. Flybackconverter:

  12. Current builds up in the primarywinding • Secondary winding has the opposite polarity D1OFF • C maintains the output voltage, supplies loadcurrent Mode 1 Operation -- Q1ON

  13. Polarity of the windingsreverses • Diode D1 conducts, charging C and providing current to the loadRL • Secondary current falls to 0 before the next cyclebegins Mode 2 Operation -- Q1 turnedOFF

  14. WaveformSummary:

  15. 2. Push-PullConverter:

  16. Operation of the Push-PullConverter: • Q1 ON, Vs across the lower primarywinding • Q2 ON, Vs across the upper primarywinding

  17. 3.Half-BridgeConverter:

  18. Full-BridgeConverter:

  19. 1. Machine toolindustries • 2. Security Systems • (Closed circuitcameras) • 3. Support supplies withPLC’s • 4. PersonalComputers • 5. Mobile Phonechargers Applications ofSMPS:-

  20. SMPS in Indianmarkets: Cooler master550W Rs.3800 iball600W Rs.4700 Antec750W Rs.6600 Seasonic500W Rs.3600 UMAX450W Rs.570 Corsair750W Rs.10700

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