# 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