1.1 Introduction

Animation 1.1: Alternating current.

Animation 1.2: Alternating current versus direct current

Figure 1.1: A motor generator set to convert a.c power into d.c power.

Figure 1.2: Interrelation of power electronics with other fields of electrical engineering.

1.2 Why do we need energy conversion?

1.3 Distinguishing features of power electronics

Figure 1.3: A typical power electronics converter system showing various conversions that can take place.

1.4 Basic energy conversion examples and issues

Figure 1.4: A simple circuit to demonstrate the power electronics converters.

Figure 1.5: The voltage waveforms of the circuit shown in figure 1.4.

Figure 1.6: An a.c to d.c converter using a diode.

Figure 1.7: A half wave a.c to d.c converter using a diode and feeding a load with resistive and inductive components.

Figure 1.8: The voltage and current waveforms for a simple half wave rectifier.

1.5 Important considerations in power electronics

Figure 1.9: A single phase full bridge rectifier feeding a resistive load.

Animation 1.3: Kirchhoff’s Voltage Law

Animation 1.4: Kirchhoff’s Current Law

Figure 1.10: A converter with two current sources.

Figure 1.11: A single phase full bridge rectifier feeding a resistive load, alternative 1.

Figure 1.12: A single phase full bridge rectifier feeding a resistive load, alternative 2.

Figure 1.13: A single phase full bridge rectifier feeding a resistive load, alternative 3.

1.6 Fourier series analysis and power electronics converters

Figure 1.14: A d.c to d.c converter configuration.

Figure 1.15: The output voltage and current waveforms for the circuit shown in figure 1.14.

1.7 Parameters for converter evaluation

1.8 Equivalent sources

Figure 1.16: Output voltage waveform of a single phase a.c to d.c converter.

Figure 1.17: A single phase full wave rectifier and its equivalent.

Figure 1.18: A d.c to a.c converter and its equivalent.

Figure 1.19: Output voltage waveform of a d.c to a.c inverter.

1.9 Conclusion

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