DC TO DC CONVERTER

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Presentation Transcript

DC TO DC CONVERTER : 

DC TO DC CONVERTER PRESENTED BY ANKAN BANDYOPADHYAY

: 

Outline 3.1 Basic DC to DC converters 3.1.1 Buck converter (Step- down converter) 3.1.2 Boost converter (Step-up converter) 3.2 Composite DC/DC converters and connection of multiple DC/DC converters 3.2.1 A current-reversible chopper 3.2.2 Bridge chopper (H-bridge DC/DC converter) 3.2.3 Multi-phase multi-channel DC/DC converters DC to DC Converters

Basic DC to DC converters : 

Basic DC to DC converters Buck converter SPDT switch changes dc component Switch output voltage waveform Duty cycle D: 0 ≤ D ≤ 1 complement D: D´ = 1 - D

Slide 4: 

Dc component of switch output voltage

Slide 5: 

Insertion of low- pass filter to remove switching harmonics and pass only dc component

Slide 6: 

Basic operation principle of buck converter

Slide 7: 

Thought process in analyzing basic DC/DC converters 1) Basic operation principle (qualitative analysis) –How does current flows during different switching states –How is energy transferred during different switching states 2) Verification of small ripple approximation 3) Derivation of inductor voltage waveform during different switching states 4) Quantitative analysis according to inductor volt-second balance or capacitor charge balance

Slide 8: 

Actual output voltage waveform of buck converter

Slide 9: 

Buck converter analysis: inductor current waveform

Slide 10: 

Inductor voltage and current subinterval 1: switch in position 1

Slide 11: 

Inductor voltage and current subinterval 2: switch in position 2

Slide 12: 

Inductor voltage and current waveforms

Slide 13: 

Determination of inductor current ripple magnitude

Slide 14: 

Inductor current waveform during start-up transient

Slide 15: 

The principle of inductor volt- second balance: Derivation Inductor defining relation: Integrate over one complete switching period: In periodic steady state, the net changes in inductor current is zero: Hence, the total area(or volt-seconds)under the inductor voltage waveform is zero whenever the converter operates in steady state. An equivalent form: The average inductor voltage is zero in steady state.

Slide 16: 

Inductor volt-second balance:Buck converter example Integral of voltage waveform is area of rectangles: average voltage is Equate to zero and solve for V:

3.1.2Boost converter : 

3.1.2Boost converter Boost converter example

Slide 18: 

Boost converter analysis

Slide 19: 

Subinterval 1: switch in position 1

Slide 20: 

Subinterval 2: switch in position 2

Slide 21: 

Inductor voltage and capacitor current waveforms

Slide 22: 

Inductor volt- second balance

Conversion ratio M(D) of the boost converter : 

Conversion ratio M(D) of the boost converter

Slide 24: 

Determination of inductor current dc component

Continuous- Conduction- Mode (CCM) and Discontinuous Conduction-Mode (DCM) of boost : 

Continuous- Conduction- Mode (CCM) and Discontinuous Conduction-Mode (DCM) of boost

3.2 Composite DC/DC converters and connection of multiple DC/DC converters : 

3.2 Composite DC/DC converters and connection of multiple DC/DC converters 3.2.1 A current reversible chopper

Slide 27: 

3.2.2Bridge chopper (H-bridge chopper)

3.2.3Multi-phase multi-channel DC/DC converter : 

3.2.3Multi-phase multi-channel DC/DC converter