Power electronics Chapter 3 DC to Dc converters (Choppers
PPoowweerr EElleeccttrroonniiccss Chapter 3 DC to DC Converters (Choppers)
PEREC Outline 3.1 Basic dc to dc converters 3.1. 1 Buck converter( Step-down converter) 3.1.2 Boost converter(Step-up converter) 3.1.3 Buck-Boost converter(Step-down/step-up converter) and Cuk converter 3.1. 4 Sepic converter and zeta 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 2
Power Electron cs i 2 Outline Outline 3.1 Basic DC to DC converters Basic DC to DC converters 3.1.1 Buck converter (Step 3.1.1 Buck converter (Step -down converter) down converter) 3.1.2 Boost converter (Step 3.1.2 Boost converter (Step -up converter) up converter) 3.1.3 Buc 3.1.3 Buc k -Boost converter (Step Boost converter (Step -down/step down/step -up converter) and up converter) and Cuk converter converter 3.1.4 Sepic converter and Zeta converter converter and Zeta converter 3.2 Composite DC/DC converters and connection of 3.2 Composite DC/DC converters and connection of multiple DC/DC converters multiple DC/DC converters 3.2.1 A current 3.2.1 A current -reversible chopper reversible chopper 3.2.2 Bridge chopper (H 3.2.2 Bridge chopper (H -bridge DC/ bridge DC/DC converter) C converter) 3.2.3 Mu 3.2.3 Multi -phase multi phase multi -channel DC/DC converters channel DC/DC converters
PEREC 3.1 Basic dc to dc converters Introduction -Buck converter SPDT switch changes dc component s R2 v() Switch output voltage waveform Duty cycle D 0≤D<1 complement D D=1-D switch osition 3
Power E l ect r o n cs i 3 3.1 Basic DC to DC converters Basic DC to DC converters Introduction Introduction—Buck converter Buck converter SPDT switch changes dc SPDT switch changes dc component component Switch output voltage Switch output voltage waveform Duty cycle D: Duty cycle D: 0 ≤ D ≤ 1 complement D’: D’ = 1 - D
PEREC Dc component of switch output voltage <>=D ared DTV s g DT Fourier analysis dc component average value T )÷(D)=DF
Power Electron cs i 4 Dc component of switch output voltage Dc component of switch output voltage Fourier analysis: Dc component = average value
aec Insertion of low-pass filter to remove switching e harmonics and pass only dc component 0 D 5
Power Electron cs i 5 Insertion of low Insertion of low -pass filter to remove switching pass filter to remove switching harmonics and pass only dc component harmonics and pass only dc component