Chapter 8: DC-DC Converters
8.1: Introduction
Figure 8.1a: General Configuration Buck Converter.
Figure 8.1b: General Configuration Boost Converter.
Figure 8.1c: General Configuration Buck-Boost Converter.
8.3: Principle of step down operation
Figure 8.2a: Step down operation.
Figure 8.2b: Voltage across the load resistance.
8.4: The Buck Converter with R-L-E Load
Figure 8.3: Schematics of a buck converter feeding a R-L-E load.
Figure 8.4a: Time domain circuit of buck converter in mode 1.
Figure 8.4b: Time domain circuit of buck converter in mode 2.
Figure 8.5: Current through R - L - E load.
Animation 8.1: Buck converter for continouse conduction.
Figure 8.6: Normalized current ripple versus duty ratio.
Figure 8.7: Current ripple versus duty ratio for a fixed switching frequency.
Figure 8.8: Current ripple versus duty ratio for a varying switching frequency.
Box 8.1
Figure 8.B1.1: Buck converter with R-L load.
Figure 8.B1.2: Voltage across the load.
Figure 8.B1.3: Voltage across the load obtained from Fourier series representation.
Figure 8.B1.4: Load current obtained from Fourier series representation.
Figure 8.B1.5: Buck converter with R-L-E load.
Example 8.1
Figure 8.9: Current waveform for buck converter with R-L-E load in discontinous conduction.
Figure 8.10: Voltage across the load in a buck converter with R - L - E load in case of discontinuous conduction.
Animation 8.2: Buck converter with discontinuous load current.
Box 8.2
Figure 8.B2.1: Voltage across load for discontinuous mode of conduction.
Figure 8.B2.2: Load current for discontinuous mode of conduction.
8.5: The Buck Converter with R Load and Filter
Figure 8.11: Buck converter with L-C filter.
Figure 8.12: The voltage and current through the inductor in a buck conveter with L-C filter.
Figure 8.13: The inductor voltage and current waveforms for discontinuous operation.
Figure 8.14: Current versus duty ratio keeping input voltage constant.
Figure 8.15: Load current and voltage in a buck converter with L-C filter in discontinuous operation is buck converter.
Figure 8.16: Buck converter characteristics for constant input current.
8.6: Conclusion:
Video Lecture 8.1
Video Lecture 8.2
Video Lecture 8.1
Video Lecture 8.2