satendra microsoft office power point presentation
TRANSCRIPT
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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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