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Kamla Nehru Institute of

Technology

A SEMINAR ON

Switch Mode Power SupplyPRESENTED BY:SATENDRA KUMAR

0810420049

3rd

yr, EE

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INTRODUCTION

A smaller, lighter & efficient power supply

system.

Switch-mode power supplies (SMPSs) are

frequently used to provide the various levels of

DC output power needed for modern

applications, and necessary in achievinghighly efficient, reliable DC-DC power-

conversion systems.

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OVERVIEW OF SMPS

Switching Power Supplies

Voltage regulation via controlled

power transfer.

Linear Power Supplies

Voltage regulation via power dissipation

Power dissipation creates Heat problems

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Why Switch Mode Power

Supplies?

Switch Mode power supplies offer the

advantages of smaller size, weight, and cost

while achieving much higher power efficiencies.

Switch mode power supplies have a more

complex circuit design than linear power

supplies, but at medium to high power levels,

the cost and complexity of dealing with highheat dissipation outweighs a more complex

circuit.

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SMPS DC Converter Topologies

SMPSs can convert a DC input voltageinto a different DC output voltage,

depending on the circuit topology.

Step-down (Buck).

Step-up (Boost).

Step-up/down (Buck-boost or Inverter).

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Buck DC to DC Converters

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Off Mode

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Continued

Vout = Vin D

Where:

D = PWM dutycycle = Ton / (Ton + Toff)

range of duty cycle = 0 to 1

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Boost DC to DC Converters

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Switch off Mode

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Continued

Vout = Vin / (1- D)

Where:

D = PWM dutycycle = Ton / (Ton + Toff)

range of duty cycle = 0 to < 0.8

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Buck Boost DC to DC

Converters-Inverting converter

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Switch Off Mode

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Continued

Vout = -Vin D / (1- D)

Where:

D = PWM dutycycle = Ton / (Ton + Toff)

range of duty cycle = 0 to < 0.8

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Linear power supplies can only step-downan input voltage to produce a lower

output voltage

SMPS has higher efficiency than Linearregulators

SMPS Vs Linear Regulators

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SMPS Advantages

More Efficient

Smaller Size

Less Weight

Less Cost

Easier PFC support

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Electromagnetic radiation & noiseconduction

Complexity in circuit design

SMPS Disadvantages

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Conclusion

In that way Switch-mode power supplies(SMPSs) are frequently used to providethe various levels of DC output power

needed for modern applications, and areindispensable in achieving highly efficient,reliable DC-DC power-conversion

systems. The versatility of SMPSs solvesthe problem of converting a standardsource voltage into a usable, specifiedoutput voltage.

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Applications

Machine tool industries.

Security systems (Close Circuit

Cameras).

In computers and other electronic

accessories.

Support supplies with PLCs.

ESPs of power plants.

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References

[1]. An introduction to Switch Mode Power Supply Maxim journaldated September 27, 2007; application note 4087.

[2]. An introduction to Switch Mode Power Supply A journal fromMicrochip Technology.

[3]. Switch Mode Power Supply Rev. 3A, July2002 reference manualfrom ON Semiconductor.

[4].http://en.wikipedia.org/wiki/Switched-mode_power_supply FromWikipedia.

[5]. http://books.google.co.in/books?id=vUNb3PCRRu0C&printsec=frontcover&dq=switch+mode+power+supply#v= onepage&q=&f=true From Google Books.

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